├── .gitignore ├── LICENSE ├── README.md ├── codelabs-android ├── .classpath ├── .project ├── .settings │ └── org.eclipse.jdt.core.prefs ├── AndroidManifest.xml ├── assets │ └── data │ │ ├── fonts │ │ ├── Righteous-12.fnt │ │ ├── Righteous-16.fnt │ │ ├── Righteous-24.fnt │ │ └── righteous.png │ │ ├── images │ │ ├── codelabs_splash.png │ │ ├── crab.png │ │ └── github_splash.png │ │ └── ui │ │ ├── atlas.pack │ │ ├── atlas.png │ │ └── menu_skin.json ├── gen │ └── com │ │ └── leakedbits │ │ └── codelabs │ │ └── BuildConfig.java ├── ic_launcher-web.png ├── libs │ ├── armeabi-v7a │ │ └── libgdx.so │ ├── armeabi │ │ └── libgdx.so │ ├── gdx-backend-android-sources.jar │ ├── gdx-backend-android.jar │ └── x86 │ │ └── libgdx.so ├── proguard.cfg ├── project.properties ├── res │ ├── drawable-hdpi │ │ └── ic_launcher.png │ ├── drawable-ldpi │ │ └── ic_launcher.png │ ├── drawable-mdpi │ │ └── ic_launcher.png │ ├── drawable-xhdpi │ │ └── ic_launcher.png │ ├── drawable-xxhdpi │ │ └── ic_launcher.png │ ├── layout │ │ └── main.xml │ └── values │ │ └── strings.xml └── src │ └── com │ └── leakedbits │ └── codelabs │ └── MainActivity.java ├── codelabs-desktop ├── .classpath ├── .project ├── .settings │ └── org.eclipse.jdt.core.prefs ├── libs │ ├── gdx-backend-lwjgl-natives.jar │ ├── gdx-backend-lwjgl-sources.jar │ ├── gdx-backend-lwjgl.jar │ └── gdx-natives.jar └── src │ └── com │ └── leakedbits │ └── codelabs │ └── Main.java └── codelabs ├── .classpath ├── .project ├── .settings └── org.eclipse.jdt.core.prefs ├── libs ├── gdx-sources.jar └── gdx.jar └── src ├── Codelabs.gwt.xml └── com └── leakedbits └── codelabs ├── Codelabs.java ├── MainMenu.java ├── SplashScreen.java ├── box2d ├── BouncingBallSample.java ├── BuoyancySample.java ├── CollisionsSample.java ├── DragAndDropSample.java ├── GravityAccelerometerSample.java ├── ImpulsesSample.java ├── JumpingSample.java ├── SpawnBodiesSample.java ├── SpritesSample.java ├── controllers │ └── BuoyancyController.java └── utils │ ├── Box2DFactory.java │ ├── Box2DSamples.java │ └── PolygonProperties.java └── utils ├── PolygonIntersector.java ├── Sample.java └── SampleUtils.java /.gitignore: -------------------------------------------------------------------------------- 1 | # and2 2 | nightly/libs 3 | bitz/data/* 4 | 5 | ignore/* 6 | 7 | .DS_Store 8 | */.DS_Store 9 | **/**/.DS_Store 10 | 11 | .metadata 12 | */.metadata 13 | 14 | */bin/** 15 | */tmp/** 16 | */tmp/**/* 17 | *.tmp 18 | *.bak 19 | *.swp 20 | *~.nib 21 | 22 | RemoteSystemsTempFiles/ 23 | 24 | # android specific 25 | # */gen/* ### we want these! 26 | */bin 27 | 28 | # files for the dex VM 29 | *.dex 30 | 31 | # Java class files 32 | *.class 33 | 34 | # generated GUI files 35 | *R.java 36 | 37 | ### eclipse files we DO want 38 | # local.properties 39 | # */.loadpath 40 | # classpath 41 | # settings 42 | 43 | codelabs-desktop/assets/* -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | 3 | Copyright (c) 2014 Leakedbits 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | Leakedbits Codelabs 2 | =================== 3 | All source code of our Android app, Codelabs, is stored here for you to look, download, test, fork and admire! 4 | 5 | Do you want to start coding with libGDX but it seems impossible to you? Since there are not enough examples on the Internet, we are offering them to you. So go ahead, maybe with our help you will become a succesful libGDX developer! 6 | 7 | 8 | Take a look at our [Codelabs app] (https://play.google.com/store/apps/details?id=com.leakedbits.codelabs) at Google Play and its [changelog](https://github.com/Leakedbits/Codelabs/wiki/Changelog)! 9 | 10 |

Available demos and code so far

11 | 12 | Ckeck out a further explaination of them in [our Wiki](https://github.com/Leakedbits/Codelabs/wiki)! 13 | -------------------------------------------------------------------------------- /codelabs-android/.classpath: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | -------------------------------------------------------------------------------- /codelabs-android/.project: -------------------------------------------------------------------------------- 1 | 2 | 3 | codelabs-android 4 | 5 | 6 | 7 | 8 | 9 | com.android.ide.eclipse.adt.ResourceManagerBuilder 10 | 11 | 12 | 13 | 14 | com.android.ide.eclipse.adt.PreCompilerBuilder 15 | 16 | 17 | 18 | 19 | org.eclipse.jdt.core.javabuilder 20 | 21 | 22 | 23 | 24 | com.android.ide.eclipse.adt.ApkBuilder 25 | 26 | 27 | 28 | 29 | 30 | com.android.ide.eclipse.adt.AndroidNature 31 | org.eclipse.jdt.core.javanature 32 | 33 | 34 | -------------------------------------------------------------------------------- /codelabs-android/.settings/org.eclipse.jdt.core.prefs: -------------------------------------------------------------------------------- 1 | eclipse.preferences.version=1 2 | org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6 3 | org.eclipse.jdt.core.compiler.compliance=1.6 4 | org.eclipse.jdt.core.compiler.source=1.6 5 | -------------------------------------------------------------------------------- /codelabs-android/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 8 | 9 | 12 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | -------------------------------------------------------------------------------- /codelabs-android/assets/data/fonts/Righteous-12.fnt: -------------------------------------------------------------------------------- 1 | info face="Righteous" size=12 bold=0 italic=0 charset="" unicode=1 stretchH=100 smooth=1 aa=2 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-------------------------------------------------------------------------------- 1 | 2 | atlas.png 3 | format: RGBA8888 4 | filter: Nearest,Nearest 5 | repeat: none 6 | btn_over_blue 7 | rotate: false 8 | xy: 1, 1 9 | size: 32, 32 10 | split: 10, 10, 10, 10 11 | orig: 32, 32 12 | offset: 0, 0 13 | index: -1 14 | btn_over_red 15 | rotate: false 16 | xy: 35, 1 17 | size: 32, 32 18 | split: 10, 10, 10, 10 19 | orig: 32, 32 20 | offset: 0, 0 21 | index: -1 22 | btn_down_blue 23 | rotate: false 24 | xy: 69, 1 25 | size: 32, 32 26 | split: 10, 10, 10, 10 27 | orig: 32, 32 28 | offset: 0, 0 29 | index: -1 30 | btn_down_red 31 | rotate: false 32 | xy: 103, 1 33 | size: 32, 32 34 | split: 10, 10, 10, 10 35 | orig: 32, 32 36 | offset: 0, 0 37 | index: -1 38 | btn_up_blue 39 | rotate: false 40 | xy: 137, 1 41 | size: 32, 32 42 | split: 10, 10, 10, 10 43 | orig: 32, 32 44 | offset: 0, 0 45 | index: -1 46 | btn_up_red 47 | rotate: false 48 | xy: 171, 1 49 | size: 32, 32 50 | split: 10, 10, 10, 10 51 | orig: 32, 32 52 | offset: 0, 0 53 | index: -1 54 | -------------------------------------------------------------------------------- /codelabs-android/assets/data/ui/atlas.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/assets/data/ui/atlas.png -------------------------------------------------------------------------------- /codelabs-android/assets/data/ui/menu_skin.json: -------------------------------------------------------------------------------- 1 | { 2 | "com.badlogic.gdx.graphics.Color": { 3 | "white": { "r": 1, "g": 1, "b": 1, "a": 1 }, 4 | "white": { "r": 0, "g": 0, "b": 0, "a": 1 } 5 | }, 6 | "com.badlogic.gdx.graphics.g2d.BitmapFont": { 7 | "righteous-12": { "file": "data/fonts/Righteous-12.fnt" }, 8 | "righteous-16": { "file": "data/fonts/Righteous-16.fnt" }, 9 | "righteous-24": { "file": "data/fonts/Righteous-24.fnt" } 10 | }, 11 | "com.badlogic.gdx.scenes.scene2d.ui.TextButton$TextButtonStyle": { 12 | "blue": { 13 | "up": "btn_up_blue", 14 | "down": "btn_down_blue", 15 | "over": "btn_over_blue", 16 | "font": righteous-16 17 | }, 18 | "red": { 19 | "up": "btn_up_red", 20 | "down": "btn_down_red", 21 | "over": "btn_over_red", 22 | "font": righteous-16 23 | } 24 | } 25 | } -------------------------------------------------------------------------------- /codelabs-android/gen/com/leakedbits/codelabs/BuildConfig.java: -------------------------------------------------------------------------------- 1 | /** Automatically generated file. DO NOT MODIFY */ 2 | package com.leakedbits.codelabs; 3 | 4 | public final class BuildConfig { 5 | public final static boolean DEBUG = true; 6 | } -------------------------------------------------------------------------------- /codelabs-android/ic_launcher-web.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/ic_launcher-web.png -------------------------------------------------------------------------------- /codelabs-android/libs/armeabi-v7a/libgdx.so: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/libs/armeabi-v7a/libgdx.so -------------------------------------------------------------------------------- /codelabs-android/libs/armeabi/libgdx.so: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/libs/armeabi/libgdx.so -------------------------------------------------------------------------------- /codelabs-android/libs/gdx-backend-android-sources.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/libs/gdx-backend-android-sources.jar -------------------------------------------------------------------------------- /codelabs-android/libs/gdx-backend-android.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/libs/gdx-backend-android.jar -------------------------------------------------------------------------------- /codelabs-android/libs/x86/libgdx.so: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/libs/x86/libgdx.so -------------------------------------------------------------------------------- /codelabs-android/proguard.cfg: -------------------------------------------------------------------------------- 1 | -optimizationpasses 5 2 | -dontusemixedcaseclassnames 3 | -dontskipnonpubliclibraryclasses 4 | -dontpreverify 5 | -verbose 6 | -optimizations !code/simplification/arithmetic,!field/*,!class/merging/* 7 | 8 | -keep public class * extends android.app.Activity 9 | -keep public class * extends android.app.Application 10 | -keep public class * extends android.app.Service 11 | -keep public class * extends android.content.BroadcastReceiver 12 | -keep public class * extends android.content.ContentProvider 13 | -keep public class * extends android.app.backup.BackupAgentHelper 14 | -keep public class * extends android.preference.Preference 15 | -keep public class com.android.vending.licensing.ILicensingService 16 | 17 | -keepclasseswithmembernames class * { 18 | native ; 19 | } 20 | 21 | -keepclasseswithmembers class * { 22 | public (android.content.Context, android.util.AttributeSet); 23 | } 24 | 25 | -keepclasseswithmembers class * { 26 | public (android.content.Context, android.util.AttributeSet, int); 27 | } 28 | 29 | -keepclassmembers class * extends android.app.Activity { 30 | public void *(android.view.View); 31 | } 32 | 33 | -keepclassmembers enum * { 34 | public static **[] values(); 35 | public static ** valueOf(java.lang.String); 36 | } 37 | 38 | -keep class * implements android.os.Parcelable { 39 | public static final android.os.Parcelable$Creator *; 40 | } 41 | -------------------------------------------------------------------------------- /codelabs-android/project.properties: -------------------------------------------------------------------------------- 1 | # This file is automatically generated by Android Tools. 2 | # Do not modify this file -- YOUR CHANGES WILL BE ERASED! 3 | # 4 | # This file must be checked in Version Control Systems. 5 | # 6 | # To customize properties used by the Ant build system use, 7 | # "ant.properties", and override values to adapt the script to your 8 | # project structure. 9 | 10 | # Project target. 11 | target=android-19 12 | -------------------------------------------------------------------------------- /codelabs-android/res/drawable-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/res/drawable-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /codelabs-android/res/drawable-ldpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/res/drawable-ldpi/ic_launcher.png -------------------------------------------------------------------------------- /codelabs-android/res/drawable-mdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/res/drawable-mdpi/ic_launcher.png -------------------------------------------------------------------------------- /codelabs-android/res/drawable-xhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/res/drawable-xhdpi/ic_launcher.png -------------------------------------------------------------------------------- /codelabs-android/res/drawable-xxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-android/res/drawable-xxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /codelabs-android/res/layout/main.xml: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | -------------------------------------------------------------------------------- /codelabs-android/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | Codelabs 4 | -------------------------------------------------------------------------------- /codelabs-android/src/com/leakedbits/codelabs/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs; 2 | 3 | import android.os.Bundle; 4 | 5 | import com.badlogic.gdx.backends.android.AndroidApplication; 6 | import com.badlogic.gdx.backends.android.AndroidApplicationConfiguration; 7 | 8 | public class MainActivity extends AndroidApplication { 9 | @Override 10 | public void onCreate(Bundle savedInstanceState) { 11 | super.onCreate(savedInstanceState); 12 | 13 | AndroidApplicationConfiguration cfg = new AndroidApplicationConfiguration(); 14 | cfg.useGL20 = false; 15 | 16 | initialize(new Codelabs(), cfg); 17 | } 18 | } -------------------------------------------------------------------------------- /codelabs-desktop/.classpath: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /codelabs-desktop/.project: -------------------------------------------------------------------------------- 1 | 2 | 3 | codelabs-desktop 4 | 5 | 6 | 7 | 8 | 9 | org.eclipse.jdt.core.javabuilder 10 | 11 | 12 | 13 | 14 | 15 | org.eclipse.jdt.core.javanature 16 | 17 | 18 | 19 | assets 20 | 2 21 | PARENT-1-PROJECT_LOC/codelabs-android/assets 22 | 23 | 24 | 25 | -------------------------------------------------------------------------------- /codelabs-desktop/.settings/org.eclipse.jdt.core.prefs: -------------------------------------------------------------------------------- 1 | eclipse.preferences.version=1 2 | org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled 3 | org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6 4 | org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve 5 | org.eclipse.jdt.core.compiler.compliance=1.6 6 | org.eclipse.jdt.core.compiler.debug.lineNumber=generate 7 | org.eclipse.jdt.core.compiler.debug.localVariable=generate 8 | org.eclipse.jdt.core.compiler.debug.sourceFile=generate 9 | org.eclipse.jdt.core.compiler.problem.assertIdentifier=error 10 | org.eclipse.jdt.core.compiler.problem.enumIdentifier=error 11 | org.eclipse.jdt.core.compiler.source=1.6 12 | -------------------------------------------------------------------------------- /codelabs-desktop/libs/gdx-backend-lwjgl-natives.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-desktop/libs/gdx-backend-lwjgl-natives.jar -------------------------------------------------------------------------------- /codelabs-desktop/libs/gdx-backend-lwjgl-sources.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-desktop/libs/gdx-backend-lwjgl-sources.jar -------------------------------------------------------------------------------- /codelabs-desktop/libs/gdx-backend-lwjgl.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-desktop/libs/gdx-backend-lwjgl.jar -------------------------------------------------------------------------------- /codelabs-desktop/libs/gdx-natives.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs-desktop/libs/gdx-natives.jar -------------------------------------------------------------------------------- /codelabs-desktop/src/com/leakedbits/codelabs/Main.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs; 2 | 3 | import com.badlogic.gdx.backends.lwjgl.LwjglApplication; 4 | import com.badlogic.gdx.backends.lwjgl.LwjglApplicationConfiguration; 5 | 6 | public class Main { 7 | public static void main(String[] args) { 8 | LwjglApplicationConfiguration cfg = new LwjglApplicationConfiguration(); 9 | cfg.title = Codelabs.TITLE + " (" + Codelabs.VERSION + ")"; 10 | cfg.useGL20 = false; 11 | cfg.width = 800; 12 | cfg.height = 600; 13 | 14 | new LwjglApplication(new Codelabs(), cfg); 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /codelabs/.classpath: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /codelabs/.project: -------------------------------------------------------------------------------- 1 | 2 | 3 | codelabs 4 | 5 | 6 | 7 | 8 | 9 | org.eclipse.jdt.core.javabuilder 10 | 11 | 12 | 13 | 14 | 15 | org.eclipse.jdt.core.javanature 16 | 17 | 18 | -------------------------------------------------------------------------------- /codelabs/.settings/org.eclipse.jdt.core.prefs: -------------------------------------------------------------------------------- 1 | eclipse.preferences.version=1 2 | org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled 3 | org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6 4 | org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve 5 | org.eclipse.jdt.core.compiler.compliance=1.6 6 | org.eclipse.jdt.core.compiler.debug.lineNumber=generate 7 | org.eclipse.jdt.core.compiler.debug.localVariable=generate 8 | org.eclipse.jdt.core.compiler.debug.sourceFile=generate 9 | org.eclipse.jdt.core.compiler.problem.assertIdentifier=error 10 | org.eclipse.jdt.core.compiler.problem.enumIdentifier=error 11 | org.eclipse.jdt.core.compiler.source=1.6 12 | -------------------------------------------------------------------------------- /codelabs/libs/gdx-sources.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs/libs/gdx-sources.jar -------------------------------------------------------------------------------- /codelabs/libs/gdx.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Leakedbits/Codelabs/67d62e139964425e4995cc1913f416929d995122/codelabs/libs/gdx.jar -------------------------------------------------------------------------------- /codelabs/src/Codelabs.gwt.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/Codelabs.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs; 2 | 3 | import com.badlogic.gdx.Game; 4 | 5 | public class Codelabs extends Game { 6 | 7 | public static final String TITLE = "Codelabs"; 8 | public static final String VERSION = "v0.6.0"; 9 | 10 | public static final float TARGET_WIDTH = 800; 11 | 12 | @Override 13 | public void create() { 14 | setScreen(new SplashScreen()); 15 | } 16 | 17 | } 18 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/MainMenu.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs; 2 | 3 | import java.util.ArrayList; 4 | import java.util.List; 5 | 6 | import com.badlogic.gdx.Game; 7 | import com.badlogic.gdx.Gdx; 8 | import com.badlogic.gdx.Screen; 9 | import com.badlogic.gdx.graphics.GL20; 10 | import com.badlogic.gdx.graphics.g2d.TextureAtlas; 11 | import com.badlogic.gdx.math.Interpolation; 12 | import com.badlogic.gdx.scenes.scene2d.EventListener; 13 | import com.badlogic.gdx.scenes.scene2d.InputEvent; 14 | import com.badlogic.gdx.scenes.scene2d.Stage; 15 | import com.badlogic.gdx.scenes.scene2d.actions.Actions; 16 | import com.badlogic.gdx.scenes.scene2d.ui.Skin; 17 | import com.badlogic.gdx.scenes.scene2d.ui.Table; 18 | import com.badlogic.gdx.scenes.scene2d.ui.TextButton; 19 | import com.badlogic.gdx.scenes.scene2d.utils.ClickListener; 20 | import com.leakedbits.codelabs.box2d.utils.Box2DSamples; 21 | import com.leakedbits.codelabs.utils.Sample; 22 | import com.leakedbits.codelabs.utils.SampleUtils; 23 | 24 | public class MainMenu implements Screen { 25 | 26 | private static final int MAX_TABLE_COLUMNS = 2; 27 | 28 | private Skin skin; 29 | private Stage stage; 30 | private Table table; 31 | private TextureAtlas atlas; 32 | 33 | @Override 34 | public void render(float delta) { 35 | Gdx.gl.glClearColor(1, 1, 1, 1); 36 | Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 37 | 38 | stage.act(delta); 39 | stage.draw(); 40 | } 41 | 42 | @Override 43 | public void resize(int width, int height) { 44 | 45 | } 46 | 47 | @Override 48 | public void show() { 49 | stage = new Stage(); 50 | 51 | stage.setViewport(Codelabs.TARGET_WIDTH, Codelabs.TARGET_WIDTH 52 | * (Gdx.graphics.getHeight() / (float) Gdx.graphics.getWidth())); 53 | 54 | Gdx.input.setInputProcessor(stage); 55 | 56 | atlas = new TextureAtlas("data/ui/atlas.pack"); 57 | 58 | skin = new Skin(Gdx.files.internal("data/ui/menu_skin.json"), atlas); 59 | 60 | table = new Table(skin); 61 | table.setFillParent(true); 62 | table.defaults().uniformX().pad(3); 63 | 64 | List textButtons = new ArrayList(); 65 | 66 | for (String name : SampleUtils.getNames(Box2DSamples.SAMPLES, false)) { 67 | final Sample sample = SampleUtils.instantiateSample( 68 | Box2DSamples.SAMPLES, name); 69 | textButtons.add(createTextButton(sample.getName(), skin, "blue", 70 | new ClickListener() { 71 | @Override 72 | public void clicked(InputEvent event, float x, float y) { 73 | ((Game) Gdx.app.getApplicationListener()) 74 | .setScreen(sample); 75 | } 76 | })); 77 | } 78 | 79 | addSampleButtons(textButtons); 80 | 81 | TextButton exitButton = createTextButton("Exit", skin, "red", 82 | new ClickListener() { 83 | @Override 84 | public void clicked(InputEvent event, float x, float y) { 85 | dispose(); 86 | Gdx.app.exit(); 87 | } 88 | }); 89 | 90 | table.add(exitButton).colspan(MAX_TABLE_COLUMNS).fill(); 91 | 92 | // float displacement = Codelabs.TARGET_WIDTH - table.getWidth() / 2; 93 | // table.addAction(Actions.sequence(Actions.moveBy(displacement, 0), 94 | // Actions.delay(1, Actions.moveBy(-displacement, 0, 1, 95 | // Interpolation.swingOut)))); 96 | 97 | stage.addActor(table); 98 | 99 | } 100 | 101 | @Override 102 | public void hide() { 103 | 104 | } 105 | 106 | @Override 107 | public void pause() { 108 | 109 | } 110 | 111 | @Override 112 | public void resume() { 113 | 114 | } 115 | 116 | @Override 117 | public void dispose() { 118 | skin.dispose(); 119 | atlas.dispose(); 120 | stage.dispose(); 121 | } 122 | 123 | private void addSampleButtons(List textButtons) { 124 | int columnCounter = 0; 125 | 126 | for (TextButton textButton : textButtons) { 127 | table.add(textButton).fill(); 128 | 129 | if (++columnCounter >= MAX_TABLE_COLUMNS) { 130 | columnCounter = 0; 131 | table.row(); 132 | } 133 | } 134 | 135 | } 136 | 137 | private TextButton createTextButton(String text, Skin skin, 138 | String styleName, EventListener listener) { 139 | TextButton textButton = new TextButton(text, skin, styleName); 140 | textButton.pad(10); 141 | textButton.addListener(listener); 142 | 143 | return textButton; 144 | } 145 | } 146 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/SplashScreen.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs; 2 | 3 | import com.badlogic.gdx.Game; 4 | import com.badlogic.gdx.Gdx; 5 | import com.badlogic.gdx.Screen; 6 | import com.badlogic.gdx.graphics.GL20; 7 | import com.badlogic.gdx.graphics.Texture; 8 | import com.badlogic.gdx.math.Interpolation; 9 | import com.badlogic.gdx.scenes.scene2d.Stage; 10 | import com.badlogic.gdx.scenes.scene2d.actions.Actions; 11 | import com.badlogic.gdx.scenes.scene2d.ui.Image; 12 | 13 | public class SplashScreen implements Screen { 14 | 15 | private Image codelabsImage; 16 | private Image githubImage; 17 | private Stage stage; 18 | 19 | @Override 20 | public void render(float delta) { 21 | Gdx.gl.glClearColor(1, 1, 1, 1); 22 | Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 23 | 24 | stage.act(); 25 | 26 | stage.draw(); 27 | } 28 | 29 | @Override 30 | public void resize(int width, int height) { 31 | 32 | } 33 | 34 | @Override 35 | public void show() { 36 | stage = new Stage(); 37 | 38 | /* Load splash image */ 39 | codelabsImage = new Image(new Texture( 40 | Gdx.files.internal("data/images/codelabs_splash.png"))); 41 | 42 | githubImage = new Image(new Texture( 43 | Gdx.files.internal("data/images/github_splash.png"))); 44 | 45 | /* Set the splash image in the center of the screen */ 46 | float width = Gdx.graphics.getWidth(); 47 | float height = Gdx.graphics.getHeight(); 48 | 49 | codelabsImage.setPosition((width - codelabsImage.getWidth()) / 2, 50 | (height - codelabsImage.getHeight()) / 2); 51 | 52 | /* Fade in the image and then swing it down */ 53 | codelabsImage.getColor().a = 0f; 54 | codelabsImage.addAction(Actions.sequence(Actions.fadeIn(0.5f), Actions 55 | .delay(1, Actions.fadeOut(0.5f)))); 56 | 57 | githubImage.setPosition((width - githubImage.getWidth()) / 2, 58 | (height - githubImage.getHeight()) / 2); 59 | 60 | /* Fade in the image and then swing it down */ 61 | githubImage.getColor().a = 0f; 62 | githubImage.addAction(Actions.delay(2, Actions.sequence(Actions.fadeIn(0.5f), Actions 63 | .delay(1, Actions.moveBy(0, 64 | -(height - githubImage.getHeight() / 2), 1, 65 | Interpolation.swingIn)), Actions.run(new Runnable() { 66 | @Override 67 | public void run() { 68 | 69 | /* Show main menu after swing out */ 70 | ((Game) Gdx.app.getApplicationListener()) 71 | .setScreen(new MainMenu()); 72 | } 73 | })))); 74 | 75 | stage.addActor(codelabsImage); 76 | stage.addActor(githubImage); 77 | } 78 | 79 | @Override 80 | public void hide() { 81 | 82 | } 83 | 84 | @Override 85 | public void pause() { 86 | 87 | } 88 | 89 | @Override 90 | public void resume() { 91 | 92 | } 93 | 94 | @Override 95 | public void dispose() { 96 | stage.dispose(); 97 | } 98 | 99 | } -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/BouncingBallSample.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d; 2 | 3 | import com.badlogic.gdx.Gdx; 4 | import com.badlogic.gdx.graphics.GL20; 5 | import com.badlogic.gdx.graphics.OrthographicCamera; 6 | import com.badlogic.gdx.math.Vector2; 7 | import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; 8 | import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer; 9 | import com.badlogic.gdx.physics.box2d.FixtureDef; 10 | import com.badlogic.gdx.physics.box2d.Shape; 11 | import com.badlogic.gdx.physics.box2d.World; 12 | import com.leakedbits.codelabs.box2d.utils.Box2DFactory; 13 | import com.leakedbits.codelabs.utils.Sample; 14 | 15 | public class BouncingBallSample extends Sample { 16 | 17 | /* Use Box2DDebugRenderer, which is a model renderer for debug purposes */ 18 | private Box2DDebugRenderer debugRenderer; 19 | 20 | /* As always, we need a camera to be able to see the objects */ 21 | private OrthographicCamera camera; 22 | 23 | /* Define a world to hold all bodies and simulate reactions between them */ 24 | private World world; 25 | 26 | /** 27 | * Main constructor used to update test name. 28 | */ 29 | public BouncingBallSample() { 30 | name = "Bouncing ball"; 31 | } 32 | 33 | @Override 34 | public void render(float delta) { 35 | /* Clear screen with a black background */ 36 | Gdx.gl.glClearColor(0, 0, 0, 1); 37 | Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 38 | 39 | /* Render all graphics before do physics step */ 40 | debugRenderer.render(world, camera.combined); 41 | 42 | /* Step the simulation with a fixed time step of 1/60 of a second */ 43 | world.step(1 / 60f, 6, 2); 44 | } 45 | 46 | @Override 47 | public void show() { 48 | /* 49 | * This line is found in every sample but is not necessary for the sample 50 | * functionality. calls Sample.show() method. That method set the sample to 51 | * receive all touch and key input events. Also prevents the app from be 52 | * closed whenever the user press back button and instead returns to 53 | * main menu. 54 | */ 55 | super.show(); 56 | 57 | /* 58 | * Create world with a common gravity vector (9.81 m/s2 downwards force) 59 | * and tell world that we want objects to sleep. This last value 60 | * conserves CPU usage. 61 | */ 62 | world = new World(new Vector2(0, -9.81f), true); 63 | 64 | /* Create renderer */ 65 | debugRenderer = new Box2DDebugRenderer(); 66 | 67 | /* 68 | * Define camera viewport. Box2D uses meters internally so the camera 69 | * must be defined also in meters. We set a desired width and adjust 70 | * height to different resolutions. 71 | */ 72 | camera = new OrthographicCamera(20, 73 | 20 * (Gdx.graphics.getHeight() / (float) Gdx.graphics 74 | .getWidth())); 75 | 76 | /* Create the ball */ 77 | Shape shape = Box2DFactory.createCircleShape(0.5f); 78 | FixtureDef fixtureDef = Box2DFactory.createFixture(shape, 2.5f, 0.25f, 0.75f, false); 79 | Box2DFactory.createBody(world, BodyType.DynamicBody, fixtureDef, new Vector2(6, 5)); 80 | 81 | /* Create the ramp */ 82 | Vector2[] rampVertices = new Vector2[] { new Vector2(-2.5f, -1), new Vector2(2.5f, 1) }; 83 | shape = Box2DFactory.createChainShape(rampVertices); 84 | fixtureDef = Box2DFactory.createFixture(shape, 0, 0.3f, 0.3f, false); 85 | Box2DFactory.createBody(world, BodyType.StaticBody, fixtureDef, new Vector2(6.5f, 0)); 86 | 87 | /* Create the walls */ 88 | Box2DFactory.createWalls(world, camera.viewportWidth, camera.viewportHeight, 1); 89 | } 90 | 91 | @Override 92 | public void dispose() { 93 | debugRenderer.dispose(); 94 | world.dispose(); 95 | } 96 | 97 | } 98 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/BuoyancySample.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d; 2 | 3 | import com.badlogic.gdx.Gdx; 4 | import com.badlogic.gdx.graphics.GL20; 5 | import com.badlogic.gdx.graphics.OrthographicCamera; 6 | import com.badlogic.gdx.math.Vector2; 7 | import com.badlogic.gdx.math.Vector3; 8 | import com.badlogic.gdx.physics.box2d.Body; 9 | import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; 10 | import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer; 11 | import com.badlogic.gdx.physics.box2d.Contact; 12 | import com.badlogic.gdx.physics.box2d.ContactImpulse; 13 | import com.badlogic.gdx.physics.box2d.ContactListener; 14 | import com.badlogic.gdx.physics.box2d.Fixture; 15 | import com.badlogic.gdx.physics.box2d.FixtureDef; 16 | import com.badlogic.gdx.physics.box2d.Manifold; 17 | import com.badlogic.gdx.physics.box2d.Shape; 18 | import com.badlogic.gdx.physics.box2d.World; 19 | import com.leakedbits.codelabs.box2d.controllers.BuoyancyController; 20 | import com.leakedbits.codelabs.box2d.utils.Box2DFactory; 21 | import com.leakedbits.codelabs.utils.Sample; 22 | 23 | public class BuoyancySample extends Sample implements ContactListener { 24 | 25 | /* Max number of bodies to be spawned */ 26 | private static final int MAX_SPAWNED_BODIES = 20; 27 | 28 | /* Use Box2DDebugRenderer, which is a model renderer for debug purposes */ 29 | private Box2DDebugRenderer debugRenderer; 30 | 31 | /* As always, we need a camera to be able to see the objects */ 32 | private OrthographicCamera camera; 33 | 34 | /* Define a world to hold all bodies and simulate reactions between them */ 35 | private World world; 36 | 37 | private BuoyancyController buoyancyController; 38 | 39 | /* Counter to know how many bodies have been spawned */ 40 | private int spawnedBodies; 41 | 42 | public BuoyancySample() { 43 | name = "Buoyancy"; 44 | } 45 | 46 | @Override 47 | public void render(float delta) { 48 | /* Clear screen with a black background */ 49 | Gdx.gl.glClearColor(0, 0, 0, 1); 50 | Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 51 | 52 | /* Render all graphics before do physics step */ 53 | debugRenderer.render(world, camera.combined); 54 | 55 | /* Step the simulation with a fixed time step of 1/60 of a second */ 56 | world.step(1 / 60f, 6, 2); 57 | // buoyancyController.step(1 / 60f); 58 | 59 | buoyancyController.step(); 60 | } 61 | 62 | @Override 63 | public void show() { 64 | /* 65 | * This line is found in every sample but is not necessary for the 66 | * sample functionality. calls Sample.show() method. That method set the 67 | * sample to receive all touch and key input events. Also prevents the 68 | * app from be closed whenever the user press back button and instead 69 | * returns to main menu. 70 | */ 71 | super.show(); 72 | 73 | /* 74 | * Create world with a common gravity vector (9.81 m/s2 downwards force) 75 | * and tell world that we want objects to sleep. This last value 76 | * conserves CPU usage. 77 | */ 78 | world = new World(new Vector2(0, -9.81f), true); 79 | 80 | /* Create renderer */ 81 | debugRenderer = new Box2DDebugRenderer(); 82 | 83 | /* 84 | * Define camera viewport. Box2D uses meters internally so the camera 85 | * must be defined also in meters. We set a desired width and adjust 86 | * height to different resolutions. 87 | */ 88 | camera = new OrthographicCamera(20, 89 | 20 * (Gdx.graphics.getHeight() / (float) Gdx.graphics 90 | .getWidth())); 91 | 92 | /* 93 | * Next line must remain commented because we do this in its parent (See 94 | * Sample class). In case you are not using Sample class, uncomment this 95 | * line to set input processor to handle events. 96 | */ 97 | // Gdx.input.setInputProcessor(this); 98 | 99 | Box2DFactory.createWalls(world, camera.viewportWidth, 100 | camera.viewportHeight, 1); 101 | 102 | /* Create the water */ 103 | Shape shape = Box2DFactory.createBoxShape( 104 | (camera.viewportWidth / 2 - 1), 105 | (camera.viewportHeight / 2 - 2) / 2, new Vector2(0, 0), 0); 106 | FixtureDef fixtureDef = Box2DFactory.createFixture(shape, 1, 0.1f, 0, 107 | true); 108 | Body water = Box2DFactory.createBody(world, BodyType.StaticBody, 109 | fixtureDef, new Vector2(0, 110 | -(camera.viewportHeight / 2 - 1) / 2 - 0.5f)); 111 | 112 | /* 113 | * Create a buoyancy controller using the previous body as a fluid 114 | * sensor 115 | */ 116 | buoyancyController = new BuoyancyController(world, water 117 | .getFixtureList().first()); 118 | 119 | world.setContactListener(this); 120 | } 121 | 122 | @Override 123 | public void dispose() { 124 | debugRenderer.dispose(); 125 | world.dispose(); 126 | } 127 | 128 | @Override 129 | public void beginContact(Contact contact) { 130 | Fixture fixtureA = contact.getFixtureA(); 131 | Fixture fixtureB = contact.getFixtureB(); 132 | 133 | if (fixtureA.isSensor() 134 | && fixtureB.getBody().getType() == BodyType.DynamicBody) { 135 | buoyancyController.addBody(fixtureB); 136 | } else if (fixtureB.isSensor() 137 | && fixtureA.getBody().getType() == BodyType.DynamicBody) { 138 | buoyancyController.addBody(fixtureA); 139 | } 140 | } 141 | 142 | @Override 143 | public void endContact(Contact contact) { 144 | Fixture fixtureA = contact.getFixtureA(); 145 | Fixture fixtureB = contact.getFixtureB(); 146 | 147 | if (fixtureA.isSensor() 148 | && fixtureB.getBody().getType() == BodyType.DynamicBody) { 149 | buoyancyController.removeBody(fixtureB); 150 | } else if (fixtureB.isSensor() 151 | && fixtureA.getBody().getType() == BodyType.DynamicBody) { 152 | if (fixtureA.getBody().getWorldCenter().y > -1) { 153 | buoyancyController.removeBody(fixtureA); 154 | } 155 | } 156 | } 157 | 158 | @Override 159 | public void preSolve(Contact contact, Manifold oldManifold) { 160 | 161 | } 162 | 163 | @Override 164 | public void postSolve(Contact contact, ContactImpulse impulse) { 165 | 166 | } 167 | 168 | @Override 169 | public boolean touchUp(int screenX, int screenY, int pointer, int button) { 170 | 171 | /* Checks whether the max amount of balls were spawned */ 172 | if (spawnedBodies < MAX_SPAWNED_BODIES) { 173 | spawnedBodies++; 174 | 175 | /* Translate camera point to world point */ 176 | Vector3 unprojectedVector = new Vector3(); 177 | camera.unproject(unprojectedVector.set(screenX, screenY, 0)); 178 | 179 | /* Create a new box */ 180 | if (Math.random() >= 0.5) { 181 | Shape shape = Box2DFactory.createBoxShape(1, 1, new Vector2(0, 182 | 0), 0); 183 | FixtureDef fixtureDef = Box2DFactory.createFixture(shape, 0.5f, 184 | 0.5f, 0.5f, false); 185 | Box2DFactory.createBody(world, BodyType.DynamicBody, 186 | fixtureDef, new Vector2(unprojectedVector.x, 187 | unprojectedVector.y)); 188 | } else { 189 | /* Create a new triangle */ 190 | Shape shape = Box2DFactory.createTriangleShape(1, 1); 191 | FixtureDef fixtureDef = Box2DFactory.createFixture(shape, 0.5f, 192 | 0.5f, 0.5f, false); 193 | Box2DFactory.createBody(world, BodyType.DynamicBody, 194 | fixtureDef, new Vector2(unprojectedVector.x, 195 | unprojectedVector.y)); 196 | } 197 | } 198 | 199 | return true; 200 | } 201 | 202 | } 203 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/CollisionsSample.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d; 2 | 3 | import com.badlogic.gdx.Gdx; 4 | import com.badlogic.gdx.graphics.GL20; 5 | import com.badlogic.gdx.graphics.OrthographicCamera; 6 | import com.badlogic.gdx.math.Vector2; 7 | import com.badlogic.gdx.physics.box2d.Body; 8 | import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; 9 | import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer; 10 | import com.badlogic.gdx.physics.box2d.Contact; 11 | import com.badlogic.gdx.physics.box2d.ContactImpulse; 12 | import com.badlogic.gdx.physics.box2d.ContactListener; 13 | import com.badlogic.gdx.physics.box2d.Fixture; 14 | import com.badlogic.gdx.physics.box2d.FixtureDef; 15 | import com.badlogic.gdx.physics.box2d.Manifold; 16 | import com.badlogic.gdx.physics.box2d.Shape; 17 | import com.badlogic.gdx.physics.box2d.World; 18 | import com.leakedbits.codelabs.box2d.utils.Box2DFactory; 19 | import com.leakedbits.codelabs.utils.Sample; 20 | 21 | public class CollisionsSample extends Sample implements ContactListener { 22 | 23 | /* Use Box2DDebugRenderer, which is a model renderer for debug purposes */ 24 | private Box2DDebugRenderer debugRenderer; 25 | 26 | /* As always, we need a camera to be able to see the objects */ 27 | private OrthographicCamera camera; 28 | 29 | /* Define a world to hold all bodies and simulate reactions between them */ 30 | private World world; 31 | 32 | private Body walls; 33 | 34 | private boolean ballTouchedWall; 35 | private boolean ballTouchedBox; 36 | 37 | /* Fields to store previous accelerometer values in each iteration */ 38 | private float prevAccelX; 39 | private float prevAccelY; 40 | 41 | /** 42 | * Main constructor used to update sample name. 43 | */ 44 | public CollisionsSample() { 45 | name = "Collisions"; 46 | } 47 | 48 | @Override 49 | public void render(float delta) { 50 | /* 51 | * Clear screen with a black background. Use red instead if the ball 52 | * touched a wall or blue if touched the box. 53 | */ 54 | if (ballTouchedWall) { 55 | Gdx.gl.glClearColor(0.6f, 0, 0, 1); 56 | } else if (ballTouchedBox) { 57 | Gdx.gl.glClearColor(0, 0, 0.6f, 1); 58 | } else { 59 | Gdx.gl.glClearColor(0, 0, 0, 1); 60 | } 61 | Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 62 | 63 | /* Check if we should change the gravity */ 64 | processAccelerometer(); 65 | 66 | /* Render all graphics before do physics step */ 67 | debugRenderer.render(world, camera.combined); 68 | 69 | /* Step the simulation with a fixed time step of 1/60 of a second */ 70 | world.step(1 / 60f, 6, 2); 71 | } 72 | 73 | @Override 74 | public void show() { 75 | /* 76 | * This line is found in every sample but is not necessary for the 77 | * sample functionality. calls Sample.show() method. That method set the 78 | * sample to receive all touch and key input events. Also prevents the 79 | * app from be closed whenever the user press back button and instead 80 | * returns to main menu. 81 | */ 82 | super.show(); 83 | 84 | /* 85 | * Create world with a common gravity vector (9.81 m/s2 downwards force) 86 | * and tell world that we want objects to sleep. This last value 87 | * conserves CPU usage. As we use the accelerometer and the world 88 | * gravity to change bodies positions, we can't let bodies to sleep. 89 | */ 90 | world = new World(new Vector2(0, -9.81f), false); 91 | 92 | /* Create renderer */ 93 | debugRenderer = new Box2DDebugRenderer(); 94 | 95 | /* 96 | * Define camera viewport. Box2D uses meters internally so the camera 97 | * must be defined also in meters. We set a desired width and adjust 98 | * height to different resolutions. 99 | */ 100 | camera = new OrthographicCamera(20, 101 | 20 * (Gdx.graphics.getHeight() / (float) Gdx.graphics 102 | .getWidth())); 103 | 104 | /* Create the ball */ 105 | Shape shape = Box2DFactory.createCircleShape(1); 106 | FixtureDef fixtureDef = Box2DFactory.createFixture(shape, 2.5f, 0.25f, 107 | 0.75f, false); 108 | Box2DFactory.createBody(world, BodyType.DynamicBody, fixtureDef, 109 | new Vector2(5, 0)); 110 | 111 | /* Create the box */ 112 | shape = Box2DFactory.createBoxShape(0.5f, 0.5f, new Vector2(0, 0), 0); 113 | fixtureDef = Box2DFactory.createFixture(shape, 1, 0.5f, 0.5f, false); 114 | Box2DFactory.createBody(world, BodyType.StaticBody, fixtureDef, 115 | new Vector2(0, 0)); 116 | 117 | /* Create the walls */ 118 | walls = Box2DFactory.createWalls(world, camera.viewportWidth, 119 | camera.viewportHeight, 1); 120 | 121 | world.setContactListener(this); 122 | } 123 | 124 | @Override 125 | public void dispose() { 126 | debugRenderer.dispose(); 127 | world.dispose(); 128 | } 129 | 130 | private void processAccelerometer() { 131 | 132 | /* Get accelerometer values */ 133 | float y = Gdx.input.getAccelerometerY(); 134 | float x = Gdx.input.getAccelerometerX(); 135 | 136 | /* 137 | * If accelerometer values have changed since previous processing, 138 | * change world gravity. 139 | */ 140 | if (prevAccelX != x || prevAccelY != y) { 141 | 142 | /* Negative on the x axis but not in the y */ 143 | world.setGravity(new Vector2(y, -x)); 144 | 145 | /* Store new accelerometer values */ 146 | prevAccelX = x; 147 | prevAccelY = y; 148 | } 149 | } 150 | 151 | @Override 152 | public void beginContact(Contact contact) { 153 | Fixture fixtureA = contact.getFixtureA(); 154 | Fixture fixtureB = contact.getFixtureB(); 155 | 156 | /* 157 | * If one of the fixture contacting is an static body, and is the wall, 158 | * set ballTouchedWall to true. 159 | */ 160 | if (fixtureA.getBody().getType() == BodyType.StaticBody) { 161 | if (fixtureA.getBody().equals(walls)) { 162 | ballTouchedBox = false; 163 | ballTouchedWall = true; 164 | } else { 165 | ballTouchedBox = true; 166 | ballTouchedWall = false; 167 | } 168 | } else if (fixtureB.getBody().getType() == BodyType.StaticBody) { 169 | if (fixtureA.getBody().equals(walls)) { 170 | ballTouchedBox = false; 171 | ballTouchedWall = true; 172 | } else { 173 | ballTouchedBox = true; 174 | ballTouchedWall = false; 175 | } 176 | } 177 | } 178 | 179 | @Override 180 | public void endContact(Contact contact) { 181 | 182 | } 183 | 184 | @Override 185 | public void preSolve(Contact contact, Manifold oldManifold) { 186 | 187 | } 188 | 189 | @Override 190 | public void postSolve(Contact contact, ContactImpulse impulse) { 191 | 192 | } 193 | 194 | } 195 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/DragAndDropSample.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d; 2 | 3 | import com.badlogic.gdx.Gdx; 4 | import com.badlogic.gdx.graphics.GL20; 5 | import com.badlogic.gdx.graphics.OrthographicCamera; 6 | import com.badlogic.gdx.math.Vector2; 7 | import com.badlogic.gdx.math.Vector3; 8 | import com.badlogic.gdx.physics.box2d.Body; 9 | import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; 10 | import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer; 11 | import com.badlogic.gdx.physics.box2d.Fixture; 12 | import com.badlogic.gdx.physics.box2d.FixtureDef; 13 | import com.badlogic.gdx.physics.box2d.QueryCallback; 14 | import com.badlogic.gdx.physics.box2d.Shape; 15 | import com.badlogic.gdx.physics.box2d.World; 16 | import com.badlogic.gdx.physics.box2d.joints.MouseJoint; 17 | import com.badlogic.gdx.physics.box2d.joints.MouseJointDef; 18 | import com.leakedbits.codelabs.box2d.utils.Box2DFactory; 19 | import com.leakedbits.codelabs.utils.Sample; 20 | 21 | public class DragAndDropSample extends Sample { 22 | 23 | /* Use Box2DDebugRenderer, which is a model renderer for debug purposes */ 24 | private Box2DDebugRenderer debugRenderer; 25 | 26 | /* As always, we need a camera to be able to see the objects */ 27 | private OrthographicCamera camera; 28 | 29 | /* Define a world to hold all bodies and simulate reactions between them */ 30 | private World world; 31 | 32 | /* 33 | * Used to define a mouse joint for a body. This point will track a 34 | * specified world point. 35 | */ 36 | private MouseJoint mouseJoint; 37 | private MouseJointDef mouseJointDef; 38 | 39 | /* Store the position of the last touch or mouse click */ 40 | private Vector3 touchPosition; 41 | 42 | /** 43 | * Main constructor used to update sample name. 44 | */ 45 | public DragAndDropSample() { 46 | name = "Drag and drop"; 47 | } 48 | 49 | @Override 50 | public void render(float delta) { 51 | /* Clear screen with a black background */ 52 | Gdx.gl.glClearColor(0, 0, 0, 1); 53 | Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 54 | 55 | /* Render all graphics before do physics step */ 56 | debugRenderer.render(world, camera.combined); 57 | 58 | /* Step the simulation with a fixed time step of 1/60 of a second */ 59 | world.step(1 / 60f, 6, 2); 60 | } 61 | 62 | @Override 63 | public void show() { 64 | /* 65 | * This line is found in every sample but is not necessary for the 66 | * sample functionality. calls Sample.show() method. That method set the 67 | * sample to receive all touch and key input events. Also prevents the 68 | * app from be closed whenever the user press back button and instead 69 | * returns to main menu. 70 | */ 71 | super.show(); 72 | 73 | /* 74 | * Create world with a common gravity vector (9.81 m/s2 downwards force) 75 | * and tell world that we want objects to sleep. This last value 76 | * conserves CPU usage. 77 | */ 78 | world = new World(new Vector2(0, -9.81f), true); 79 | 80 | /* Create renderer */ 81 | debugRenderer = new Box2DDebugRenderer(); 82 | 83 | /* 84 | * Define camera viewport. Box2D uses meters internally so the camera 85 | * must be defined also in meters. We set a desired width and adjust 86 | * height to different resolutions. 87 | */ 88 | camera = new OrthographicCamera(20, 89 | 20 * (Gdx.graphics.getHeight() / (float) Gdx.graphics 90 | .getWidth())); 91 | 92 | /* 93 | * Next line must remain commented because we do this in its parent (See 94 | * Sample class). In case you are not using Sample class, uncomment this 95 | * line to set input processor to handle events. 96 | */ 97 | // Gdx.input.setInputProcessor(this); 98 | 99 | /* 100 | * Instantiate the vector that will be used to store click/touch 101 | * positions. 102 | */ 103 | touchPosition = new Vector3(); 104 | 105 | /* Create the ball */ 106 | Shape shape = Box2DFactory.createCircleShape(1); 107 | FixtureDef fixtureDef = Box2DFactory.createFixture(shape, 2.5f, 0.25f, 108 | 0.75f, false); 109 | Box2DFactory.createBody(world, BodyType.DynamicBody, fixtureDef, 110 | new Vector2(0, 0)); 111 | 112 | /* Create the walls */ 113 | Body walls = Box2DFactory.createWalls(world, camera.viewportWidth, 114 | camera.viewportHeight, 1); 115 | 116 | /* Define the mouse joint. We use walls as the first body of the joint */ 117 | createMouseJointDefinition(walls); 118 | } 119 | 120 | @Override 121 | public void dispose() { 122 | debugRenderer.dispose(); 123 | world.dispose(); 124 | } 125 | 126 | /** 127 | * Creates the MouseJoint definition. 128 | * 129 | * @param body 130 | * First body of the joint (i.e. ground, walls, etc.) 131 | */ 132 | private void createMouseJointDefinition(Body body) { 133 | mouseJointDef = new MouseJointDef(); 134 | mouseJointDef.bodyA = body; 135 | mouseJointDef.collideConnected = true; 136 | mouseJointDef.maxForce = 500; 137 | } 138 | 139 | @Override 140 | public boolean touchDown(int screenX, int screenY, int pointer, int button) { 141 | /* 142 | * Define a new QueryCallback. This callback will be used in 143 | * world.QueryAABB method. 144 | */ 145 | QueryCallback queryCallback = new QueryCallback() { 146 | 147 | @Override 148 | public boolean reportFixture(Fixture fixture) { 149 | boolean testResult; 150 | 151 | /* 152 | * If the hit point is inside the fixture of the body, create a 153 | * new MouseJoint. 154 | */ 155 | if (testResult = fixture.testPoint(touchPosition.x, 156 | touchPosition.y)) { 157 | mouseJointDef.bodyB = fixture.getBody(); 158 | mouseJointDef.target.set(touchPosition.x, touchPosition.y); 159 | mouseJoint = (MouseJoint) world.createJoint(mouseJointDef); 160 | } 161 | 162 | return testResult; 163 | } 164 | }; 165 | 166 | /* Translate camera point to world point */ 167 | camera.unproject(touchPosition.set(screenX, screenY, 0)); 168 | 169 | /* 170 | * Query the world for all fixtures that potentially overlap the touched 171 | * point. 172 | */ 173 | world.QueryAABB(queryCallback, touchPosition.x, touchPosition.y, 174 | touchPosition.x, touchPosition.y); 175 | 176 | return true; 177 | } 178 | 179 | @Override 180 | public boolean touchUp(int screenX, int screenY, int pointer, int button) { 181 | 182 | /* Whether the input was processed */ 183 | boolean processed = false; 184 | 185 | /* If a MouseJoint is defined, destroy it */ 186 | if (mouseJoint != null) { 187 | world.destroyJoint(mouseJoint); 188 | mouseJoint = null; 189 | processed = true; 190 | } 191 | 192 | return processed; 193 | } 194 | 195 | @Override 196 | public boolean touchDragged(int screenX, int screenY, int pointer) { 197 | 198 | /* Whether the input was processed */ 199 | boolean processed = false; 200 | 201 | /* 202 | * If a MouseJoint is defined, update its target with current position. 203 | */ 204 | if (mouseJoint != null) { 205 | 206 | /* Translate camera point to world point */ 207 | camera.unproject(touchPosition.set(screenX, screenY, 0)); 208 | mouseJoint.setTarget(new Vector2(touchPosition.x, touchPosition.y)); 209 | } 210 | 211 | return processed; 212 | } 213 | 214 | } 215 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/GravityAccelerometerSample.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d; 2 | 3 | import com.badlogic.gdx.Gdx; 4 | import com.badlogic.gdx.graphics.GL20; 5 | import com.badlogic.gdx.graphics.OrthographicCamera; 6 | import com.badlogic.gdx.math.Vector2; 7 | import com.badlogic.gdx.math.Vector3; 8 | import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; 9 | import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer; 10 | import com.badlogic.gdx.physics.box2d.FixtureDef; 11 | import com.badlogic.gdx.physics.box2d.Shape; 12 | import com.badlogic.gdx.physics.box2d.World; 13 | import com.leakedbits.codelabs.box2d.utils.Box2DFactory; 14 | import com.leakedbits.codelabs.utils.Sample; 15 | 16 | public class GravityAccelerometerSample extends Sample { 17 | 18 | /* Max number of balls to be spawned */ 19 | private static final int MAX_SPAWNED_BALLS = 20; 20 | 21 | /* Use Box2DDebugRenderer, which is a model renderer for debug purposes */ 22 | private Box2DDebugRenderer debugRenderer; 23 | 24 | /* As always, we need a camera to be able to see the objects */ 25 | private OrthographicCamera camera; 26 | 27 | /* Define a world to hold all bodies and simulate reactions between them */ 28 | private World world; 29 | 30 | /* Counter to know how many ball have been spawned */ 31 | private int spawnedBalls; 32 | 33 | /* Fields to store previous accelerometer values in each iteration */ 34 | private float prevAccelX; 35 | private float prevAccelY; 36 | 37 | /** 38 | * Main constructor used to update sample name. 39 | */ 40 | public GravityAccelerometerSample() { 41 | name = "Gravity and accelerometer"; 42 | } 43 | 44 | @Override 45 | public void render(float delta) { 46 | /* Clear screen with a black background */ 47 | Gdx.gl.glClearColor(0, 0, 0, 1); 48 | Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 49 | 50 | /* Check if we should change the gravity */ 51 | processAccelerometer(); 52 | 53 | /* Render all graphics before do physics step */ 54 | debugRenderer.render(world, camera.combined); 55 | 56 | /* Step the simulation with a fixed time step of 1/60 of a second */ 57 | world.step(1 / 60f, 6, 2); 58 | } 59 | 60 | @Override 61 | public void show() { 62 | /* 63 | * This line is found in every sample but is not necessary for the 64 | * sample functionality. calls Sample.show() method. That method set the 65 | * sample to receive all touch and key input events. Also prevents the 66 | * app from be closed whenever the user press back button and instead 67 | * returns to main menu. 68 | */ 69 | super.show(); 70 | 71 | /* 72 | * Create world with a common gravity vector (9.81 m/s2 downwards force) 73 | * and tell world that we want objects to sleep. This last value 74 | * conserves CPU usage. As we use the accelerometer and the world 75 | * gravity to change bodies positions, we can't let bodies to sleep. 76 | */ 77 | world = new World(new Vector2(0, -9.81f), true); 78 | 79 | /* Create renderer */ 80 | debugRenderer = new Box2DDebugRenderer(); 81 | 82 | /* 83 | * Define camera viewport. Box2D uses meters internally so the camera 84 | * must be defined also in meters. We set a desired width and adjust 85 | * height to different resolutions. 86 | */ 87 | camera = new OrthographicCamera(20, 88 | 20 * (Gdx.graphics.getHeight() / (float) Gdx.graphics 89 | .getWidth())); 90 | 91 | /* 92 | * Next line must remain commented because we do this in its parent (See 93 | * Sample class). In case you are not using Sample class, uncomment this 94 | * line to set input processor to handle events. 95 | */ 96 | // Gdx.input.setInputProcessor(this); 97 | 98 | /* Create the walls */ 99 | Box2DFactory.createWalls(world, camera.viewportWidth, 100 | camera.viewportHeight, 1); 101 | } 102 | 103 | @Override 104 | public void dispose() { 105 | debugRenderer.dispose(); 106 | world.dispose(); 107 | } 108 | 109 | private void processAccelerometer() { 110 | 111 | /* Get accelerometer values */ 112 | float y = Gdx.input.getAccelerometerY(); 113 | float x = Gdx.input.getAccelerometerX(); 114 | 115 | /* 116 | * If accelerometer values have changed since previous processing, 117 | * change world gravity. 118 | */ 119 | if (prevAccelX != x || prevAccelY != y) { 120 | 121 | /* Negative on the x axis but not in the y */ 122 | world.setGravity(new Vector2(y, -x)); 123 | 124 | /* Store new accelerometer values */ 125 | prevAccelX = x; 126 | prevAccelY = y; 127 | } 128 | } 129 | 130 | /* 131 | * Input events handling. Here will process all touch events to spawn and 132 | * drag bodies. 133 | */ 134 | 135 | @Override 136 | public boolean touchUp(int screenX, int screenY, int pointer, int button) { 137 | 138 | /* Checks whether the max amount of balls were spawned */ 139 | if (spawnedBalls < MAX_SPAWNED_BALLS) { 140 | spawnedBalls++; 141 | 142 | /* Translate camera point to world point */ 143 | Vector3 unprojectedVector = new Vector3(); 144 | camera.unproject(unprojectedVector.set(screenX, screenY, 0)); 145 | 146 | /* Create a new ball */ 147 | Shape shape = Box2DFactory.createCircleShape(1); 148 | FixtureDef fixtureDef = Box2DFactory.createFixture(shape, 2.5f, 149 | 0.25f, 0.75f, false); 150 | Box2DFactory.createBody(world, BodyType.DynamicBody, fixtureDef, 151 | new Vector2(unprojectedVector.x, unprojectedVector.y)); 152 | } 153 | 154 | return true; 155 | } 156 | 157 | } 158 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/ImpulsesSample.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d; 2 | 3 | import com.badlogic.gdx.Gdx; 4 | import com.badlogic.gdx.graphics.GL20; 5 | import com.badlogic.gdx.graphics.OrthographicCamera; 6 | import com.badlogic.gdx.math.Vector2; 7 | import com.badlogic.gdx.physics.box2d.Body; 8 | import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; 9 | import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer; 10 | import com.badlogic.gdx.physics.box2d.FixtureDef; 11 | import com.badlogic.gdx.physics.box2d.Shape; 12 | import com.badlogic.gdx.physics.box2d.World; 13 | import com.leakedbits.codelabs.box2d.utils.Box2DFactory; 14 | import com.leakedbits.codelabs.utils.Sample; 15 | 16 | public class ImpulsesSample extends Sample { 17 | 18 | /* Use Box2DDebugRenderer, which is a model renderer for debug purposes */ 19 | private Box2DDebugRenderer debugRenderer; 20 | 21 | /* Use a long to store current time and calculate user touches duration */ 22 | private Long timer; 23 | 24 | /* As always, we need a camera to be able to see the objects */ 25 | private OrthographicCamera camera; 26 | 27 | /* Define a world to hold all bodies and simulate reactions between them */ 28 | private World world; 29 | 30 | /* Define a body to later apply impulses to it */ 31 | private Body box; 32 | 33 | /** 34 | * Main constructor used to update sample name. 35 | */ 36 | public ImpulsesSample() { 37 | name = "Impulses"; 38 | } 39 | 40 | @Override 41 | public void render(float delta) { 42 | /* Clear screen with a black background */ 43 | Gdx.gl.glClearColor(0, 0, 0, 1); 44 | Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 45 | 46 | /* Render all graphics before do physics step */ 47 | debugRenderer.render(world, camera.combined); 48 | 49 | /* Step the simulation with a fixed time step of 1/60 of a second */ 50 | world.step(1 / 60f, 6, 2); 51 | } 52 | 53 | @Override 54 | public void show() { 55 | /* 56 | * This line is found in every sample but is not necessary for the 57 | * sample functionality. calls Sample.show() method. That method set the 58 | * sample to receive all touch and key input events. Also prevents the 59 | * app from be closed whenever the user press back button and instead 60 | * returns to main menu. 61 | */ 62 | super.show(); 63 | 64 | /* 65 | * Create world with a common gravity vector (9.81 m/s2 downwards force) 66 | * and tell world that we want objects to sleep. This last value 67 | * conserves CPU usage. 68 | */ 69 | world = new World(new Vector2(0, -9.81f), true); 70 | 71 | /* Create renderer */ 72 | debugRenderer = new Box2DDebugRenderer(); 73 | 74 | /* 75 | * Define camera viewport. Box2D uses meters internally so the camera 76 | * must be defined also in meters. We set a desired width and adjust 77 | * height to different resolutions. 78 | */ 79 | camera = new OrthographicCamera(20, 80 | 20 * (Gdx.graphics.getHeight() / (float) Gdx.graphics 81 | .getWidth())); 82 | 83 | /* 84 | * Next line must remain commented because we do this in its parent (See 85 | * Sample class). In case you are not using Sample class, uncomment this 86 | * line to set input processor to handle events. 87 | */ 88 | // Gdx.input.setInputProcessor(this); 89 | 90 | /* Create the box */ 91 | Shape shape = Box2DFactory.createBoxShape(1.5f, 1.5f, 92 | new Vector2(0, 0), 0); 93 | FixtureDef fixtureDef = Box2DFactory.createFixture(shape, 0.3f, 0.5f, 94 | 0.5f, false); 95 | box = Box2DFactory.createBody(world, BodyType.DynamicBody, fixtureDef, 96 | new Vector2(0, 0)); 97 | 98 | /* Create the walls */ 99 | Box2DFactory.createWalls(world, camera.viewportWidth, 100 | camera.viewportHeight, 1); 101 | } 102 | 103 | @Override 104 | public void dispose() { 105 | debugRenderer.dispose(); 106 | world.dispose(); 107 | } 108 | 109 | /* 110 | * Input events handling. Here will start our timer, which will be used 111 | * before. 112 | */ 113 | @Override 114 | public boolean touchDown(int screenX, int screenY, int pointer, int button) { 115 | /* 116 | * Get current time in milliseconds. We will use this to calculate the 117 | * time the user has touched the screen. 118 | */ 119 | this.timer = System.currentTimeMillis(); 120 | 121 | return true; 122 | } 123 | 124 | /* 125 | * Input events handling. Here will stop our timer, calculate the impulse 126 | * and apply it to the body. 127 | */ 128 | @Override 129 | public boolean touchUp(int screenX, int screenY, int pointer, int button) { 130 | 131 | /* Calculate the time the user has touched the screen */ 132 | long touchedTime = System.currentTimeMillis() - timer; 133 | 134 | /* Every second touching the screen will increment by 20 the impulse */ 135 | float impulse = Math.max(10f, touchedTime / 50); 136 | 137 | /* 138 | * The impulse is applied to the body's center, and only on the Y axis. 139 | * It will aggregate the impulse to the current Y speed, so, if the 140 | * object is falling the impulse will be the difference between the 141 | * object speed and the given value. 142 | */ 143 | box.applyLinearImpulse(new Vector2(0, impulse), box.getWorldCenter(), 144 | true); 145 | 146 | return true; 147 | } 148 | } 149 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/JumpingSample.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d; 2 | 3 | import com.badlogic.gdx.Gdx; 4 | import com.badlogic.gdx.graphics.GL20; 5 | import com.badlogic.gdx.graphics.OrthographicCamera; 6 | import com.badlogic.gdx.math.Vector2; 7 | import com.badlogic.gdx.physics.box2d.Body; 8 | import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; 9 | import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer; 10 | import com.badlogic.gdx.physics.box2d.Contact; 11 | import com.badlogic.gdx.physics.box2d.ContactImpulse; 12 | import com.badlogic.gdx.physics.box2d.ContactListener; 13 | import com.badlogic.gdx.physics.box2d.FixtureDef; 14 | import com.badlogic.gdx.physics.box2d.Manifold; 15 | import com.badlogic.gdx.physics.box2d.Shape; 16 | import com.badlogic.gdx.physics.box2d.World; 17 | import com.leakedbits.codelabs.box2d.utils.Box2DFactory; 18 | import com.leakedbits.codelabs.utils.Sample; 19 | 20 | public class JumpingSample extends Sample implements ContactListener { 21 | 22 | /* Use Box2DDebugRenderer, which is a model renderer for debug purposes */ 23 | private Box2DDebugRenderer debugRenderer; 24 | 25 | /* As always, we need a camera to be able to see the objects */ 26 | private OrthographicCamera camera; 27 | 28 | /* Define a world to hold all bodies and simulate reactions between them */ 29 | private World world; 30 | 31 | /* Define a body to later apply impulses to it */ 32 | private Body player; 33 | 34 | /* 35 | * Boolean variables to know if the player is jumping or if he/she can 36 | * double jump. 37 | */ 38 | private boolean isPlayerGrounded; 39 | private boolean hasDoubleJump; 40 | 41 | /** 42 | * Main constructor used to update sample name. 43 | */ 44 | public JumpingSample() { 45 | name = "Jump and double jump"; 46 | } 47 | 48 | @Override 49 | public void render(float delta) { 50 | /* Clear screen with a black background */ 51 | Gdx.gl.glClearColor(0, 0, 0, 1); 52 | Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 53 | 54 | /* Render all graphics before do physics step */ 55 | debugRenderer.render(world, camera.combined); 56 | 57 | /* Step the simulation with a fixed time step of 1/60 of a second */ 58 | world.step(1 / 60f, 6, 2); 59 | } 60 | 61 | @Override 62 | public void show() { 63 | /* 64 | * This line is found in every sample but is not necessary for the 65 | * sample functionality. calls Sample.show() method. That method set the 66 | * sample to receive all touch and key input events. Also prevents the 67 | * app from be closed whenever the user press back button and instead 68 | * returns to main menu. 69 | */ 70 | super.show(); 71 | 72 | /* 73 | * Create world with a common gravity vector (9.81 m/s2 downwards force) 74 | * and tell world that we want objects to sleep. This last value 75 | * conserves CPU usage. 76 | */ 77 | world = new World(new Vector2(0, -9.81f), true); 78 | 79 | /* Create renderer */ 80 | debugRenderer = new Box2DDebugRenderer(); 81 | 82 | /* 83 | * Define camera viewport. Box2D uses meters internally so the camera 84 | * must be defined also in meters. We set a desired width and adjust 85 | * height to different resolutions. 86 | */ 87 | camera = new OrthographicCamera(20, 88 | 20 * (Gdx.graphics.getHeight() / (float) Gdx.graphics 89 | .getWidth())); 90 | 91 | /* 92 | * Next line must remain commented because we do this in its parent (See 93 | * Sample class). In case you are not using Sample class, uncomment this 94 | * line to set input processor to handle events. 95 | */ 96 | // Gdx.input.setInputProcessor(this); 97 | 98 | /* Create the player */ 99 | Shape shape = Box2DFactory.createBoxShape(0.35f, 1, new Vector2(0, 0), 100 | 0); 101 | FixtureDef fixtureDef = Box2DFactory.createFixture(shape, 1, 0, 0, 102 | false); 103 | player = Box2DFactory.createBody(world, BodyType.DynamicBody, 104 | fixtureDef, new Vector2(0, 0)); 105 | 106 | /* 107 | * Create foot sensor. This sensor will be used to detect when the 108 | * player is standing on something. 109 | */ 110 | shape = Box2DFactory.createBoxShape(0.1f, 0.1f, new Vector2(0, -1), 0); 111 | fixtureDef = Box2DFactory.createFixture(shape, 0, 0, 0, true); 112 | 113 | /* 114 | * Set user data to the player. In this case we are using an integer. 115 | * This will help us to identify the fixture during collision handling. 116 | */ 117 | player.createFixture(fixtureDef).setUserData(new Integer(3)); 118 | 119 | /* 120 | * Fix the rotation of player's body. We don't want our player to fall 121 | * every time he/she touch an object :) 122 | */ 123 | player.setFixedRotation(true); 124 | 125 | /* Create the walls */ 126 | Box2DFactory.createWalls(world, camera.viewportWidth, 127 | camera.viewportHeight, 1); 128 | 129 | world.setContactListener(this); 130 | } 131 | 132 | @Override 133 | public void dispose() { 134 | debugRenderer.dispose(); 135 | world.dispose(); 136 | } 137 | 138 | @Override 139 | public void beginContact(Contact contact) { 140 | /* 141 | * For each fixture contacting (A and B) check if it has user data 142 | * associated. In that case and only if it is the number 3 that we 143 | * previously associated to our player, change isPlayerGrounded and 144 | * hasDobleJump variables to true. 145 | */ 146 | Object userData = contact.getFixtureA().getUserData(); 147 | if (userData != null && (Integer) userData == 3) { 148 | isPlayerGrounded = true; 149 | hasDoubleJump = true; 150 | } else { 151 | userData = contact.getFixtureB().getUserData(); 152 | if (userData != null && (Integer) userData == 3) { 153 | isPlayerGrounded = true; 154 | hasDoubleJump = true; 155 | } 156 | } 157 | } 158 | 159 | @Override 160 | public void endContact(Contact contact) { 161 | /* 162 | * For each fixture contacting (A and B) check if it has user data 163 | * associated. In that case and only if it is the number 3 that we 164 | * previously associated to our player, change isPlayerGrounded false to 165 | * indicate that our player is jumping. 166 | */ 167 | Object userData = contact.getFixtureA().getUserData(); 168 | if (userData != null && (Integer) userData == 3) { 169 | isPlayerGrounded = false; 170 | hasDoubleJump = false; 171 | } else { 172 | userData = contact.getFixtureB().getUserData(); 173 | if (userData != null && (Integer) userData == 3) { 174 | isPlayerGrounded = false; 175 | } 176 | } 177 | } 178 | 179 | @Override 180 | public void preSolve(Contact contact, Manifold oldManifold) { 181 | 182 | } 183 | 184 | @Override 185 | public void postSolve(Contact contact, ContactImpulse impulse) { 186 | 187 | } 188 | 189 | /* 190 | * Input events handling. Here will stop our timer, calculate the impulse 191 | * and apply it to the body. 192 | */ 193 | @Override 194 | public boolean touchDown(int screenX, int screenY, int pointer, int button) { 195 | /* 196 | * Firstly we check if the player is standing over something or if 197 | * he/she can double jump. 198 | */ 199 | if (isPlayerGrounded || hasDoubleJump) { 200 | 201 | /* 202 | * If a double jump was use it, remove this hability until the 203 | * player is over something again. 204 | */ 205 | if (!isPlayerGrounded && hasDoubleJump) { 206 | hasDoubleJump = false; 207 | } 208 | 209 | /* 210 | * Finally, apply a vertical linear impulse relative to the player 211 | * mass. 212 | */ 213 | float impulse = player.getMass() * 5; 214 | player.applyLinearImpulse(new Vector2(0, impulse), 215 | player.getWorldCenter(), true); 216 | } 217 | 218 | return true; 219 | } 220 | 221 | } 222 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/SpawnBodiesSample.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d; 2 | 3 | import com.badlogic.gdx.Gdx; 4 | import com.badlogic.gdx.graphics.GL20; 5 | import com.badlogic.gdx.graphics.OrthographicCamera; 6 | import com.badlogic.gdx.math.Vector2; 7 | import com.badlogic.gdx.math.Vector3; 8 | import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; 9 | import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer; 10 | import com.badlogic.gdx.physics.box2d.FixtureDef; 11 | import com.badlogic.gdx.physics.box2d.Shape; 12 | import com.badlogic.gdx.physics.box2d.World; 13 | import com.leakedbits.codelabs.box2d.utils.Box2DFactory; 14 | import com.leakedbits.codelabs.utils.Sample; 15 | 16 | public class SpawnBodiesSample extends Sample { 17 | 18 | /* Max number of balls to be spawned */ 19 | private static final int MAX_SPAWNED_BALLS = 20; 20 | 21 | /* Use Box2DDebugRenderer, which is a model renderer for debug purposes */ 22 | private Box2DDebugRenderer debugRenderer; 23 | 24 | /* As always, we need a camera to be able to see the objects */ 25 | private OrthographicCamera camera; 26 | 27 | /* Define a world to hold all bodies and simulate reactions between them */ 28 | private World world; 29 | 30 | /* Counter to know how many ball have been spawned */ 31 | private int spawnedBalls; 32 | 33 | /** 34 | * Main constructor used to update sample name. 35 | */ 36 | public SpawnBodiesSample() { 37 | name = "Spawn bodies on touch"; 38 | } 39 | 40 | @Override 41 | public void render(float delta) { 42 | /* Clear screen with a black background */ 43 | Gdx.gl.glClearColor(0, 0, 0, 1); 44 | Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 45 | 46 | /* Render all graphics before do physics step */ 47 | debugRenderer.render(world, camera.combined); 48 | 49 | /* Step the simulation with a fixed time step of 1/60 of a second */ 50 | world.step(1 / 60f, 6, 2); 51 | } 52 | 53 | @Override 54 | public void show() { 55 | /* 56 | * This line is found in every sample but is not necessary for the 57 | * sample functionality. calls Sample.show() method. That method set the 58 | * sample to receive all touch and key input events. Also prevents the 59 | * app from be closed whenever the user press back button and instead 60 | * returns to main menu. 61 | */ 62 | super.show(); 63 | 64 | /* 65 | * Create world with a common gravity vector (9.81 m/s2 downwards force) 66 | * and tell world that we want objects to sleep. This last value 67 | * conserves CPU usage. 68 | */ 69 | world = new World(new Vector2(0, -9.81f), true); 70 | 71 | /* Create renderer */ 72 | debugRenderer = new Box2DDebugRenderer(); 73 | 74 | /* 75 | * Define camera viewport. Box2D uses meters internally so the camera 76 | * must be defined also in meters. We set a desired width and adjust 77 | * height to different resolutions. 78 | */ 79 | camera = new OrthographicCamera(20, 80 | 20 * (Gdx.graphics.getHeight() / (float) Gdx.graphics 81 | .getWidth())); 82 | 83 | /* 84 | * Next line must remain commented because we do this in its parent (See 85 | * Sample class). In case you are not using Sample class, uncomment this 86 | * line to set input processor to handle events. 87 | */ 88 | // Gdx.input.setInputProcessor(this); 89 | 90 | /* Create the walls */ 91 | Box2DFactory.createWalls(world, camera.viewportWidth, 92 | camera.viewportHeight, 1); 93 | } 94 | 95 | @Override 96 | public void dispose() { 97 | debugRenderer.dispose(); 98 | world.dispose(); 99 | } 100 | 101 | /* 102 | * Input events handling. Here will process all touch events to spawn and 103 | * drag bodies. 104 | */ 105 | 106 | @Override 107 | public boolean touchUp(int screenX, int screenY, int pointer, int button) { 108 | 109 | /* Checks whether the max amount of balls were spawned */ 110 | if (spawnedBalls < MAX_SPAWNED_BALLS) { 111 | spawnedBalls++; 112 | 113 | /* Translate camera point to world point */ 114 | Vector3 unprojectedVector = new Vector3(); 115 | camera.unproject(unprojectedVector.set(screenX, screenY, 0)); 116 | 117 | /* Create a new ball */ 118 | Shape shape = Box2DFactory.createCircleShape(1); 119 | FixtureDef fixtureDef = Box2DFactory.createFixture(shape, 2.5f, 120 | 0.25f, 0.75f, false); 121 | Box2DFactory.createBody(world, BodyType.DynamicBody, fixtureDef, 122 | new Vector2(unprojectedVector.x, unprojectedVector.y)); 123 | } 124 | 125 | return true; 126 | } 127 | 128 | } 129 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/SpritesSample.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d; 2 | 3 | import com.badlogic.gdx.Gdx; 4 | import com.badlogic.gdx.graphics.GL20; 5 | import com.badlogic.gdx.graphics.OrthographicCamera; 6 | import com.badlogic.gdx.graphics.Texture; 7 | import com.badlogic.gdx.graphics.g2d.Sprite; 8 | import com.badlogic.gdx.graphics.g2d.SpriteBatch; 9 | import com.badlogic.gdx.math.MathUtils; 10 | import com.badlogic.gdx.math.Vector2; 11 | import com.badlogic.gdx.physics.box2d.Body; 12 | import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; 13 | import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer; 14 | import com.badlogic.gdx.physics.box2d.FixtureDef; 15 | import com.badlogic.gdx.physics.box2d.Shape; 16 | import com.badlogic.gdx.physics.box2d.World; 17 | import com.badlogic.gdx.utils.Array; 18 | import com.leakedbits.codelabs.box2d.utils.Box2DFactory; 19 | import com.leakedbits.codelabs.utils.Sample; 20 | 21 | public class SpritesSample extends Sample { 22 | 23 | /* Define a body to later apply impulses to it */ 24 | private Body box; 25 | 26 | /* Use Box2DDebugRenderer, which is a model renderer for debug purposes */ 27 | private Box2DDebugRenderer debugRenderer; 28 | 29 | /* Use a long to store current time and calculate user touches duration */ 30 | private Long timer; 31 | 32 | /* As always, we need a camera to be able to see the objects */ 33 | private OrthographicCamera camera; 34 | 35 | /* Define a world to hold all bodies and simulate reactions between them */ 36 | private World world; 37 | 38 | /* New variables used to hold the sprite and draw it in the screen */ 39 | private Sprite sprite; 40 | private SpriteBatch batch; 41 | 42 | /* This array will hold all the bodies of the word for rendering purposes */ 43 | private Array worldBodies; 44 | 45 | /** 46 | * Main constructor used to update sample name. 47 | */ 48 | public SpritesSample() { 49 | name = "Sprites"; 50 | } 51 | 52 | @Override 53 | public void render(float delta) { 54 | /* Clear screen with a black background */ 55 | Gdx.gl.glClearColor(1, 1, 1, 1); 56 | Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 57 | 58 | /* Render all graphics before do physics step */ 59 | debugRenderer.render(world, camera.combined); 60 | 61 | /* 62 | * Set projection matrix to camera.combined, the same way we did with 63 | * the debug renderer. 64 | */ 65 | batch.setProjectionMatrix(camera.combined); 66 | batch.begin(); 67 | 68 | /* Get word bodies */ 69 | world.getBodies(worldBodies); 70 | 71 | /* 72 | * For each body in the world we have to check if it has user data 73 | * associated and if it is an Sprite. In that case, we draw it in the 74 | * screen. 75 | */ 76 | for (Body body : worldBodies) { 77 | if (body.getUserData() instanceof Sprite) { 78 | Sprite sprite = (Sprite) body.getUserData(); 79 | 80 | /* 81 | * Set body position equals to box position. We also need to 82 | * center it in the box (measures are relative to body center). 83 | */ 84 | Vector2 position = body.getPosition(); 85 | sprite.setPosition(position.x - sprite.getWidth() / 2, 86 | position.y - sprite.getWidth() / 2); 87 | 88 | /* Set sprite rotation equals to body rotation */ 89 | sprite.setRotation(body.getAngle() * MathUtils.radiansToDegrees); 90 | 91 | /* Draw the sprite on screen */ 92 | sprite.draw(batch); 93 | } 94 | } 95 | 96 | batch.end(); 97 | 98 | /* Step the simulation with a fixed time step of 1/60 of a second */ 99 | world.step(1 / 60f, 6, 2); 100 | } 101 | 102 | @Override 103 | public void show() { 104 | /* 105 | * This line is found in every sample but is not necessary for the 106 | * sample functionality. calls Sample.show() method. That method set the 107 | * sample to receive all touch and key input events. Also prevents the 108 | * app from be closed whenever the user press back button and instead 109 | * returns to main menu. 110 | */ 111 | super.show(); 112 | 113 | /* 114 | * Create world with a common gravity vector (9.81 m/s2 downwards force) 115 | * and tell world that we want objects to sleep. This last value 116 | * conserves CPU usage. 117 | */ 118 | world = new World(new Vector2(0, -9.81f), true); 119 | 120 | /* Create renderer */ 121 | debugRenderer = new Box2DDebugRenderer(); 122 | 123 | batch = new SpriteBatch(); 124 | 125 | /* 126 | * Define camera viewport. Box2D uses meters internally so the camera 127 | * must be defined also in meters. We set a desired width and adjust 128 | * height to different resolutions. 129 | */ 130 | camera = new OrthographicCamera(20, 131 | 20 * (Gdx.graphics.getHeight() / (float) Gdx.graphics 132 | .getWidth())); 133 | 134 | /* 135 | * Next line must remain commented because we do this in its parent (See 136 | * Sample class). In case you are not using Sample class, uncomment this 137 | * line to set input processor to handle events. 138 | */ 139 | // Gdx.input.setInputProcessor(this); 140 | 141 | /* Create the box */ 142 | Shape shape = Box2DFactory.createBoxShape(1.5f, 1.5f, 143 | new Vector2(0, 0), 0); 144 | FixtureDef fixtureDef = Box2DFactory.createFixture(shape, 0.3f, 0.5f, 145 | 0.5f, false); 146 | box = Box2DFactory.createBody(world, BodyType.DynamicBody, fixtureDef, 147 | new Vector2(0, 0)); 148 | 149 | /* Create the walls */ 150 | Box2DFactory.createWalls(world, camera.viewportWidth, 151 | camera.viewportHeight, 1); 152 | 153 | /* Set box texture */ 154 | sprite = new Sprite(new Texture("data/images/crab.png")); 155 | 156 | /* 157 | * Set the size of the sprite. We have to remember that we are not 158 | * working in pixels, but with meters. The size of the sprite will be 159 | * the same as the size of the box; 2 meter wide, 2 meters tall. 160 | */ 161 | sprite.setSize(3, 3); 162 | 163 | /* 164 | * Sets the origin in relation to the sprite's position for scaling and 165 | * rotation. 166 | */ 167 | sprite.setOrigin(sprite.getWidth() / 2, sprite.getHeight() / 2); 168 | 169 | /* Set sprite as a user data of the body to draw it in each render step */ 170 | box.setUserData(sprite); 171 | 172 | /* Instantiate the array of bodies that will be used during render step */ 173 | worldBodies = new Array(); 174 | } 175 | 176 | /* 177 | * Input events handling. Here will start our timer, which will be used 178 | * before. 179 | */ 180 | @Override 181 | public boolean touchDown(int screenX, int screenY, int pointer, int button) { 182 | /* 183 | * Get current time in milliseconds. We will use this to calculate the 184 | * time the user has touched the screen. 185 | */ 186 | this.timer = System.currentTimeMillis(); 187 | 188 | return true; 189 | } 190 | 191 | /* 192 | * Input events handling. Here will stop our timer, calculate the impulse 193 | * and apply it to the body. 194 | */ 195 | @Override 196 | public boolean touchUp(int screenX, int screenY, int pointer, int button) { 197 | super.touchUp(screenX, screenY, pointer, button); 198 | 199 | /* Calculate the time the user has touched the screen */ 200 | long touchedTime = System.currentTimeMillis() - timer; 201 | 202 | /* Every second touching the screen will increment by 20 the impulse */ 203 | float impulse = Math.max(10f, touchedTime / 50); 204 | 205 | /* 206 | * The impulse is applied to the body's center, and only on the Y axis. 207 | * It will aggregate the impulse to the current Y speed, so, if the 208 | * object is falling the impulse will be the difference between the 209 | * object speed and the given value. 210 | */ 211 | box.applyLinearImpulse(new Vector2(0, impulse), box.getWorldCenter(), 212 | true); 213 | 214 | return true; 215 | } 216 | } 217 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/controllers/BuoyancyController.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d.controllers; 2 | 3 | import java.util.ArrayList; 4 | import java.util.HashSet; 5 | import java.util.List; 6 | import java.util.Set; 7 | 8 | import com.badlogic.gdx.Gdx; 9 | import com.badlogic.gdx.math.Vector2; 10 | import com.badlogic.gdx.physics.box2d.Body; 11 | import com.badlogic.gdx.physics.box2d.Fixture; 12 | import com.badlogic.gdx.physics.box2d.PolygonShape; 13 | import com.badlogic.gdx.physics.box2d.World; 14 | import com.leakedbits.codelabs.box2d.utils.PolygonProperties; 15 | import com.leakedbits.codelabs.utils.PolygonIntersector; 16 | 17 | public class BuoyancyController { 18 | 19 | private Fixture fluidSensor; 20 | private List fluidVertices; 21 | private Set fixtures; 22 | private World world; 23 | 24 | public boolean isFluidFixed = true; 25 | public float fluidDrag = 0.25f; 26 | public float fluidLift = 0.25f; 27 | public float linearDrag = 0; 28 | public float maxFluidDrag = 2000; 29 | public float maxFluidLift = 500; 30 | 31 | public BuoyancyController(World world, Fixture fluidSensor) { 32 | this.world = world; 33 | this.fluidSensor = fluidSensor; 34 | fluidVertices = getFixtureVertices(fluidSensor); 35 | 36 | fixtures = new HashSet(); 37 | } 38 | 39 | public void step() { 40 | for (Fixture fixture : fixtures) { 41 | if (fixture.getBody().isAwake()) { 42 | 43 | /* Create clipPolygon */ 44 | List clipPolygon = getFixtureVertices(fixture); 45 | 46 | /* Create subjectPolygon */ 47 | List subjectPolygon; 48 | if (isFluidFixed) { 49 | subjectPolygon = fluidVertices; 50 | } else { 51 | subjectPolygon = getFixtureVertices(fluidSensor); 52 | } 53 | 54 | /* Get intersection polygon */ 55 | List clippedPolygon = PolygonIntersector.clipPolygons( 56 | subjectPolygon, clipPolygon); 57 | 58 | if (!clippedPolygon.isEmpty()) { 59 | applyForces(fixture, clippedPolygon.toArray(new Vector2[0])); 60 | } 61 | } 62 | } 63 | } 64 | 65 | private void applyForces(Fixture fixture, Vector2[] clippedPolygon) { 66 | PolygonProperties polygonProperties = PolygonIntersector 67 | .computePolygonProperties(clippedPolygon); 68 | 69 | /* Get fixtures bodies */ 70 | Body fixtureBody = fixture.getBody(); 71 | Body fluidBody = fluidSensor.getBody(); 72 | 73 | /* Get fluid density */ 74 | float density = fluidSensor.getDensity(); 75 | 76 | /* Apply buoyancy force */ 77 | float displacedMass = fluidSensor.getDensity() 78 | * polygonProperties.getArea(); 79 | Vector2 gravity = world.getGravity(); 80 | Vector2 buoyancyForce = new Vector2(-gravity.x * displacedMass, 81 | -gravity.y * displacedMass); 82 | fixtureBody.applyForce(buoyancyForce, polygonProperties.getCentroid(), 83 | true); 84 | 85 | /* Linear drag force */ 86 | if (linearDrag != 0) { 87 | fixtureBody.applyForce(gravity.rotate90(1).nor().scl(linearDrag), 88 | polygonProperties.getCentroid(), true); 89 | } 90 | 91 | /* Apply drag and lift forces */ 92 | int polygonVertices = clippedPolygon.length; 93 | for (int i = 0; i < polygonVertices; i++) { 94 | 95 | /* Apply drag force */ 96 | 97 | /* End points and mid point of the edge */ 98 | Vector2 firstPoint = clippedPolygon[i]; 99 | Vector2 secondPoint = clippedPolygon[(i + 1) % polygonVertices]; 100 | Vector2 midPoint = firstPoint.cpy().add(secondPoint).scl(0.5f); 101 | 102 | /* 103 | * Find relative velocity between the object and the fluid at edge 104 | * mid point. 105 | */ 106 | Vector2 velocityDirection = new Vector2(fixtureBody 107 | .getLinearVelocityFromWorldPoint(midPoint) 108 | .sub(fluidBody.getLinearVelocityFromWorldPoint(midPoint))); 109 | float velocity = velocityDirection.len(); 110 | velocityDirection.nor(); 111 | 112 | Vector2 edge = secondPoint.cpy().sub(firstPoint); 113 | float edgeLength = edge.len(); 114 | edge.nor(); 115 | 116 | Vector2 normal = new Vector2(edge.y, -edge.x); 117 | float dragDot = normal.dot(velocityDirection); 118 | 119 | if (dragDot >= 0) { 120 | 121 | /* 122 | * Normal don't point backwards. This is a leading edge. Store 123 | * the result of multiply edgeLength, density and velocity 124 | * squared 125 | */ 126 | float tempProduct = edgeLength * density * velocity * velocity; 127 | 128 | float drag = dragDot * fluidDrag * tempProduct; 129 | drag = Math.min(drag, maxFluidDrag); 130 | Vector2 dragForce = velocityDirection.cpy().scl(-drag); 131 | fixtureBody.applyForce(dragForce, midPoint, true); 132 | 133 | /* Apply lift force */ 134 | float liftDot = edge.dot(velocityDirection); 135 | float lift = dragDot * liftDot * fluidLift * tempProduct; 136 | lift = Math.min(lift, maxFluidLift); 137 | Vector2 liftDirection = new Vector2(-velocityDirection.y, 138 | velocityDirection.x); 139 | Vector2 liftForce = liftDirection.scl(lift); 140 | fixtureBody.applyForce(liftForce, midPoint, true); 141 | } 142 | } 143 | } 144 | 145 | public void addBody(Fixture fixture) { 146 | try { 147 | PolygonShape polygon = (PolygonShape) fixture.getShape(); 148 | if (polygon.getVertexCount() > 2) { 149 | fixtures.add(fixture); 150 | } 151 | } catch (ClassCastException e) { 152 | Gdx.app.debug("BuoyancyController", 153 | "Fixture shape is not an instance of PolygonShape."); 154 | } 155 | } 156 | 157 | public void removeBody(Fixture fixture) { 158 | fixtures.remove(fixture); 159 | } 160 | 161 | private List getFixtureVertices(Fixture fixture) { 162 | PolygonShape polygon = (PolygonShape) fixture.getShape(); 163 | int verticesCount = polygon.getVertexCount(); 164 | 165 | List vertices = new ArrayList(verticesCount); 166 | for (int i = 0; i < verticesCount; i++) { 167 | Vector2 vertex = new Vector2(); 168 | polygon.getVertex(i, vertex); 169 | vertices.add(new Vector2(fixture.getBody().getWorldPoint(vertex))); 170 | } 171 | 172 | return vertices; 173 | } 174 | } 175 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/utils/Box2DFactory.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d.utils; 2 | 3 | import com.badlogic.gdx.math.Vector2; 4 | import com.badlogic.gdx.physics.box2d.Body; 5 | import com.badlogic.gdx.physics.box2d.BodyDef; 6 | import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; 7 | import com.badlogic.gdx.physics.box2d.ChainShape; 8 | import com.badlogic.gdx.physics.box2d.CircleShape; 9 | import com.badlogic.gdx.physics.box2d.FixtureDef; 10 | import com.badlogic.gdx.physics.box2d.PolygonShape; 11 | import com.badlogic.gdx.physics.box2d.Shape; 12 | import com.badlogic.gdx.physics.box2d.World; 13 | 14 | public class Box2DFactory { 15 | 16 | public static Body createBody(World world, BodyType bodyType, 17 | FixtureDef fixtureDef, Vector2 position) { 18 | BodyDef bodyDef = new BodyDef(); 19 | bodyDef.type = bodyType; 20 | bodyDef.position.set(position); 21 | 22 | Body body = world.createBody(bodyDef); 23 | body.createFixture(fixtureDef); 24 | 25 | fixtureDef.shape.dispose(); 26 | 27 | return body; 28 | } 29 | 30 | public static Shape createBoxShape(float halfWidth, float halfHeight, Vector2 center, float angle) { 31 | PolygonShape boxShape = new PolygonShape(); 32 | boxShape.setAsBox(halfWidth, halfHeight, center, angle); 33 | 34 | return boxShape; 35 | } 36 | 37 | public static Shape createChainShape(Vector2[] vertices) { 38 | ChainShape chainShape = new ChainShape(); 39 | chainShape.createChain(vertices); 40 | 41 | return chainShape; 42 | } 43 | 44 | public static Shape createCircleShape(float radius) { 45 | CircleShape circleShape = new CircleShape(); 46 | circleShape.setRadius(radius); 47 | 48 | return circleShape; 49 | } 50 | 51 | public static Shape createPolygonShape(Vector2[] vertices) { 52 | PolygonShape polygonShape = new PolygonShape(); 53 | polygonShape.set(vertices); 54 | 55 | return polygonShape; 56 | } 57 | 58 | public static Shape createTriangleShape(float halfWidth, float halfHeight) { 59 | PolygonShape triangleShape = new PolygonShape(); 60 | triangleShape 61 | .set(new Vector2[] { new Vector2(-halfWidth, -halfHeight), 62 | new Vector2(0, halfHeight), 63 | new Vector2(halfWidth, -halfHeight) }); 64 | 65 | return triangleShape; 66 | } 67 | 68 | public static FixtureDef createFixture(Shape shape, float density, 69 | float friction, float restitution, boolean isSensor) { 70 | FixtureDef fixtureDef = new FixtureDef(); 71 | fixtureDef.shape = shape; 72 | fixtureDef.isSensor = isSensor; 73 | fixtureDef.density = density; 74 | fixtureDef.friction = friction; 75 | fixtureDef.restitution = restitution; 76 | 77 | return fixtureDef; 78 | } 79 | 80 | public static Body createWalls(World world, float viewportWidth, 81 | float viewportHeight, float offset) { 82 | float halfWidth = viewportWidth / 2 - offset; 83 | float halfHeight = viewportHeight / 2 - offset; 84 | 85 | Vector2[] vertices = new Vector2[] { 86 | new Vector2(-halfWidth, -halfHeight), 87 | new Vector2(halfWidth, -halfHeight), 88 | new Vector2(halfWidth, halfHeight), 89 | new Vector2(-halfWidth, halfHeight), 90 | new Vector2(-halfWidth, -halfHeight) }; 91 | 92 | Shape shape = createChainShape(vertices); 93 | FixtureDef fixtureDef = createFixture(shape, 1, 0.5f, 0, false); 94 | 95 | return createBody(world, BodyType.StaticBody, fixtureDef, new Vector2( 96 | 0, 0)); 97 | } 98 | 99 | } 100 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/utils/Box2DSamples.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d.utils; 2 | 3 | import java.util.ArrayList; 4 | import java.util.Arrays; 5 | import java.util.List; 6 | 7 | import com.leakedbits.codelabs.box2d.BouncingBallSample; 8 | import com.leakedbits.codelabs.box2d.BuoyancySample; 9 | import com.leakedbits.codelabs.box2d.DragAndDropSample; 10 | import com.leakedbits.codelabs.box2d.GravityAccelerometerSample; 11 | import com.leakedbits.codelabs.box2d.ImpulsesSample; 12 | import com.leakedbits.codelabs.box2d.CollisionsSample; 13 | import com.leakedbits.codelabs.box2d.JumpingSample; 14 | import com.leakedbits.codelabs.box2d.SpawnBodiesSample; 15 | import com.leakedbits.codelabs.box2d.SpritesSample; 16 | import com.leakedbits.codelabs.utils.Sample; 17 | 18 | public class Box2DSamples { 19 | 20 | @SuppressWarnings("unchecked") 21 | public static final List> SAMPLES = new ArrayList>( 22 | Arrays.asList( 23 | BouncingBallSample.class, 24 | SpawnBodiesSample.class, 25 | DragAndDropSample.class, 26 | ImpulsesSample.class, 27 | SpritesSample.class, 28 | GravityAccelerometerSample.class, 29 | CollisionsSample.class, 30 | BuoyancySample.class, 31 | JumpingSample.class 32 | ) 33 | ); 34 | 35 | } 36 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/box2d/utils/PolygonProperties.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.box2d.utils; 2 | 3 | import com.badlogic.gdx.math.Vector2; 4 | 5 | public class PolygonProperties { 6 | 7 | private Vector2 centroid; 8 | 9 | private float area; 10 | 11 | public PolygonProperties(Vector2 centroid, float area) { 12 | this.centroid = centroid; 13 | this.area = area; 14 | } 15 | 16 | public Vector2 getCentroid() { 17 | return centroid; 18 | } 19 | 20 | public void setCentroid(Vector2 centroid) { 21 | this.centroid = centroid; 22 | } 23 | 24 | public float getArea() { 25 | return area; 26 | } 27 | 28 | public void setArea(float area) { 29 | this.area = area; 30 | } 31 | 32 | } 33 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/utils/PolygonIntersector.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.utils; 2 | 3 | import java.util.ArrayList; 4 | import java.util.List; 5 | 6 | import com.badlogic.gdx.math.Polygon; 7 | import com.badlogic.gdx.math.Vector2; 8 | import com.leakedbits.codelabs.box2d.utils.PolygonProperties; 9 | 10 | public class PolygonIntersector { 11 | 12 | /* A close to zero float epsilon value */ 13 | public static final float EPSILON = 1.1920928955078125E-7f; 14 | 15 | /** 16 | * Returns true if the given point is inside the segment. 17 | * 18 | * @param point The point to check 19 | * @param start Segment's first point 20 | * @param end Segment's last point 21 | * @return Whether the point is inside the segment 22 | */ 23 | public static boolean isPointInLineSegment(Vector2 point, Vector2 start, 24 | Vector2 end) { 25 | return isPointInLineSegment(point.x, point.y, start.x, start.y, end.x, end.y); 26 | } 27 | 28 | /** 29 | * Returns true if the given point is inside the segment. 30 | * 31 | * @param pointX X coordinate of the point 32 | * @param pointY Y coordinate of the point 33 | * @param startX X coordinate of the segment's first point 34 | * @param startY Y coordinate of the segment's first point 35 | * @param endX X coordinate of the segment's last point 36 | * @param endY Y coordinate of the segment's last point 37 | * @return Whether the point is inside the segment 38 | */ 39 | public static boolean isPointInLineSegment(float pointX, float pointY, 40 | float startX, float startY, float endX, float endY) { 41 | return (endX - startX) * (pointY - startY) > (endY - startY) 42 | * (pointX - startX); 43 | } 44 | 45 | @Deprecated 46 | public static boolean isPointInsideEdge(Vector2 point, 47 | Vector2 edgeStartPoint, Vector2 edgeEndPoint) { 48 | return (edgeEndPoint.x - edgeStartPoint.x) 49 | * (point.y - edgeStartPoint.y) > (edgeEndPoint.y - edgeStartPoint.y) 50 | * (point.x - edgeStartPoint.x); 51 | } 52 | 53 | @Deprecated 54 | public static Vector2 getEdgesIntersection(Vector2 firstEdgeStartPoint, 55 | Vector2 firstEdgeEndPoint, Vector2 secondEdgeStartPoint, 56 | Vector2 secondEdgeEndPoint) { 57 | 58 | Vector2 firstDirectionPoint = new Vector2(firstEdgeStartPoint.x 59 | - firstEdgeEndPoint.x, firstEdgeStartPoint.y 60 | - firstEdgeEndPoint.y); 61 | Vector2 secondDirectionPoint = new Vector2(secondEdgeStartPoint.x 62 | - secondEdgeEndPoint.x, secondEdgeStartPoint.y 63 | - secondEdgeEndPoint.y); 64 | 65 | /* Cross product of each edge */ 66 | float crossFirstEdge = firstEdgeStartPoint.crs(firstEdgeEndPoint); 67 | float crossSecondEdge = secondEdgeStartPoint.crs(secondEdgeEndPoint); 68 | 69 | float inversedCrossDirection = 1 / firstDirectionPoint 70 | .crs(secondDirectionPoint); 71 | 72 | return new Vector2( 73 | (crossFirstEdge * secondDirectionPoint.x - crossSecondEdge 74 | * firstDirectionPoint.x) 75 | * inversedCrossDirection, (crossFirstEdge 76 | * secondDirectionPoint.y - crossSecondEdge 77 | * firstDirectionPoint.y) 78 | * inversedCrossDirection); 79 | } 80 | 81 | public static Polygon intersectPolygons(Polygon subjectPolygon, Polygon clipPolygon) { 82 | return intersectPolygons(subjectPolygon.getVertices(), clipPolygon.getVertices()); 83 | } 84 | 85 | public static Polygon intersectPolygons(float[] subjectVertices, float[] clipVertices) { 86 | return null; 87 | } 88 | 89 | public static List clipPolygons(List subjectPolygon, 90 | List clipPolygon) { 91 | List clippedPolygonVertices = new ArrayList( 92 | subjectPolygon); 93 | 94 | Vector2 clipEdgeStartPoint = clipPolygon.get(clipPolygon.size() - 1); 95 | 96 | for (Vector2 clipEdgeEndPoint : clipPolygon) { 97 | if (clippedPolygonVertices.isEmpty()) { 98 | break; 99 | } 100 | 101 | List inputList = new ArrayList( 102 | clippedPolygonVertices); 103 | clippedPolygonVertices.clear(); 104 | 105 | Vector2 testEdgeStartPoint = inputList.get(inputList.size() - 1); 106 | for (Vector2 testEdgeEndPoint : inputList) { 107 | if (isPointInsideEdge(testEdgeEndPoint, clipEdgeStartPoint, 108 | clipEdgeEndPoint)) { 109 | if (!isPointInsideEdge(testEdgeStartPoint, 110 | clipEdgeStartPoint, clipEdgeEndPoint)) { 111 | clippedPolygonVertices.add(getEdgesIntersection( 112 | clipEdgeStartPoint, clipEdgeEndPoint, 113 | testEdgeStartPoint, testEdgeEndPoint)); 114 | } 115 | 116 | clippedPolygonVertices.add(testEdgeEndPoint); 117 | } else if (isPointInsideEdge(testEdgeStartPoint, 118 | clipEdgeStartPoint, clipEdgeEndPoint)) { 119 | clippedPolygonVertices.add(getEdgesIntersection( 120 | clipEdgeStartPoint, clipEdgeEndPoint, 121 | testEdgeStartPoint, testEdgeEndPoint)); 122 | } 123 | 124 | testEdgeStartPoint = testEdgeEndPoint; 125 | } 126 | 127 | clipEdgeStartPoint = clipEdgeEndPoint; 128 | } 129 | 130 | return clippedPolygonVertices; 131 | } 132 | 133 | public static PolygonProperties computePolygonProperties(Vector2[] polygon) { 134 | PolygonProperties polygonProperties = null; 135 | 136 | int count = polygon.length; 137 | 138 | if (count >= 3) { 139 | Vector2 centroid = new Vector2(0, 0); 140 | float area = 0; 141 | 142 | Vector2 refPoint = new Vector2(0, 0); 143 | float threeInverse = 1 / 3f; 144 | 145 | for (int i = 0; i < count; i++) { 146 | /* 147 | * Create a new vector to represent the reference point for 148 | * forming triangles. Then use refPoint, polygonVertex and 149 | * thirdTriangleVertex as vertices of a triangle. 150 | */ 151 | refPoint.set(0, 0); 152 | Vector2 polygonVertex = polygon[i]; 153 | Vector2 thirdTriangleVertex = i + 1 < count ? polygon[i + 1] 154 | : polygon[0]; 155 | 156 | Vector2 firstDirectionVector = polygonVertex.sub(refPoint); 157 | Vector2 secondDirectionVector = thirdTriangleVertex 158 | .sub(refPoint); 159 | 160 | float triangleArea = firstDirectionVector 161 | .crs(secondDirectionVector) / 2; 162 | area += triangleArea; 163 | 164 | /* Area weighted centroid */ 165 | centroid.add(refPoint.add(polygonVertex) 166 | .add(thirdTriangleVertex) 167 | .scl(triangleArea * threeInverse)); 168 | } 169 | 170 | if (area > EPSILON) { 171 | centroid.scl(1 / area); 172 | } else { 173 | area = 0; 174 | } 175 | 176 | polygonProperties = new PolygonProperties(centroid, area); 177 | } 178 | 179 | return polygonProperties; 180 | } 181 | 182 | } 183 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/utils/Sample.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.utils; 2 | 3 | import com.badlogic.gdx.Game; 4 | import com.badlogic.gdx.Gdx; 5 | import com.badlogic.gdx.Input.Keys; 6 | import com.badlogic.gdx.InputAdapter; 7 | import com.badlogic.gdx.Screen; 8 | import com.leakedbits.codelabs.MainMenu; 9 | 10 | public class Sample extends InputAdapter implements Screen { 11 | 12 | protected static String name = "Default sample name"; 13 | 14 | @Override 15 | public void render(float delta) { 16 | 17 | } 18 | 19 | @Override 20 | public void resize(int width, int height) { 21 | 22 | } 23 | 24 | @Override 25 | public void show() { 26 | Gdx.input.setInputProcessor(this); 27 | Gdx.input.setCatchBackKey(true); 28 | } 29 | 30 | @Override 31 | public void hide() { 32 | 33 | } 34 | 35 | @Override 36 | public void pause() { 37 | 38 | } 39 | 40 | @Override 41 | public void resume() { 42 | 43 | } 44 | 45 | @Override 46 | public void dispose() { 47 | 48 | } 49 | 50 | public String getName() { 51 | return name; 52 | } 53 | 54 | @Override 55 | public boolean keyDown(int keycode) { 56 | if (keycode == Keys.BACK || keycode == Keys.ESCAPE) { 57 | dispose(); 58 | Gdx.input.setCatchBackKey(false); 59 | ((Game) Gdx.app.getApplicationListener()).setScreen(new MainMenu()); 60 | } 61 | 62 | return true; 63 | } 64 | } 65 | -------------------------------------------------------------------------------- /codelabs/src/com/leakedbits/codelabs/utils/SampleUtils.java: -------------------------------------------------------------------------------- 1 | package com.leakedbits.codelabs.utils; 2 | 3 | import java.util.ArrayList; 4 | import java.util.Collections; 5 | import java.util.List; 6 | 7 | public class SampleUtils { 8 | public static List getNames(List> samples, 9 | boolean sorted) { 10 | List names = new ArrayList(samples.size()); 11 | 12 | for (Class sample : samples) { 13 | names.add(sample.getSimpleName()); 14 | } 15 | 16 | if (sorted) { 17 | Collections.sort(names); 18 | } 19 | 20 | return names; 21 | } 22 | 23 | public static Sample instantiateSample(List> samples, 24 | String sampleName) { 25 | try { 26 | return forName(samples, sampleName).newInstance(); 27 | } catch (InstantiationException e) { 28 | e.printStackTrace(); 29 | } catch (IllegalAccessException e) { 30 | e.printStackTrace(); 31 | } 32 | return null; 33 | } 34 | 35 | private static Class forName( 36 | List> samples, String sampleName) { 37 | 38 | Class requestedClass = null; 39 | 40 | for (Class sample : samples) { 41 | if (sample.getSimpleName().equals(sampleName)) { 42 | requestedClass = sample; 43 | } 44 | } 45 | 46 | return requestedClass; 47 | } 48 | 49 | } 50 | --------------------------------------------------------------------------------