├── app
    ├── .gitignore
    ├── src
    │   └── main
    │   │   ├── res
    │   │       ├── values
    │   │       │   ├── strings.xml
    │   │       │   ├── themes.xml
    │   │       │   └── colors.xml
    │   │       ├── mipmap-hdpi
    │   │       │   ├── ic_launcher.webp
    │   │       │   └── ic_launcher_round.webp
    │   │       ├── mipmap-mdpi
    │   │       │   ├── ic_launcher.webp
    │   │       │   └── ic_launcher_round.webp
    │   │       ├── mipmap-xhdpi
    │   │       │   ├── ic_launcher.webp
    │   │       │   └── ic_launcher_round.webp
    │   │       ├── mipmap-xxhdpi
    │   │       │   ├── ic_launcher.webp
    │   │       │   └── ic_launcher_round.webp
    │   │       ├── mipmap-xxxhdpi
    │   │       │   ├── ic_launcher.webp
    │   │       │   └── ic_launcher_round.webp
    │   │       ├── mipmap-anydpi-v26
    │   │       │   ├── ic_launcher.xml
    │   │       │   └── ic_launcher_round.xml
    │   │       ├── xml
    │   │       │   ├── backup_rules.xml
    │   │       │   └── data_extraction_rules.xml
    │   │       └── drawable
    │   │       │   ├── ic_launcher_foreground.xml
    │   │       │   └── ic_launcher_background.xml
    │   │   ├── java
    │   │       └── com
    │   │       │   └── mohsen
    │   │       │       └── particle
    │   │       │           ├── ui
    │   │       │               └── theme
    │   │       │               │   ├── Color.kt
    │   │       │               │   ├── Type.kt
    │   │       │               │   └── Theme.kt
    │   │       │           ├── MainActivity.kt
    │   │       │           ├── MySurface.kt
    │   │       │           ├── ParticlePool.kt
    │   │       │           ├── Particle.kt
    │   │       │           └── ParticleSystemView.kt
    │   │   └── AndroidManifest.xml
    ├── proguard-rules.pro
    └── build.gradle.kts
├── gradle
    └── wrapper
    │   ├── gradle-wrapper.jar
    │   └── gradle-wrapper.properties
├── .gitignore
├── settings.gradle.kts
├── README.md
├── gradle.properties
├── gradlew.bat
└── gradlew


/app/.gitignore:
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1 | /build


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/app/src/main/res/values/strings.xml:
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1 | <resources>
2 |     <string name="app_name">Particle System</string>
3 | </resources>


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/gradle/wrapper/gradle-wrapper.jar:
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https://raw.githubusercontent.com/MohsenSoli/ParticleSystem/HEAD/gradle/wrapper/gradle-wrapper.jar


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/app/src/main/res/mipmap-hdpi/ic_launcher.webp:
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https://raw.githubusercontent.com/MohsenSoli/ParticleSystem/HEAD/app/src/main/res/mipmap-hdpi/ic_launcher.webp


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/app/src/main/res/mipmap-mdpi/ic_launcher.webp:
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https://raw.githubusercontent.com/MohsenSoli/ParticleSystem/HEAD/app/src/main/res/mipmap-mdpi/ic_launcher.webp


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/app/src/main/res/mipmap-xhdpi/ic_launcher.webp:
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https://raw.githubusercontent.com/MohsenSoli/ParticleSystem/HEAD/app/src/main/res/mipmap-xhdpi/ic_launcher.webp


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/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp:
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https://raw.githubusercontent.com/MohsenSoli/ParticleSystem/HEAD/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp


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/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp:
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https://raw.githubusercontent.com/MohsenSoli/ParticleSystem/HEAD/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp


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/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp:
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https://raw.githubusercontent.com/MohsenSoli/ParticleSystem/HEAD/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp


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/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp:
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https://raw.githubusercontent.com/MohsenSoli/ParticleSystem/HEAD/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp


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/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp:
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https://raw.githubusercontent.com/MohsenSoli/ParticleSystem/HEAD/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp


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/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp:
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https://raw.githubusercontent.com/MohsenSoli/ParticleSystem/HEAD/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp


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/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp:
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https://raw.githubusercontent.com/MohsenSoli/ParticleSystem/HEAD/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp


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/app/src/main/res/values/themes.xml:
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1 | <?xml version="1.0" encoding="utf-8"?>
2 | <resources>
3 | 
4 |     <style name="Theme.ParticleSystem" parent="android:Theme.Material.Light.NoActionBar" />
5 | </resources>


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/gradle/wrapper/gradle-wrapper.properties:
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1 | #Thu Dec 07 13:36:20 IRST 2023
2 | distributionBase=GRADLE_USER_HOME
3 | distributionPath=wrapper/dists
4 | distributionUrl=https\://services.gradle.org/distributions/gradle-8.0-bin.zip
5 | zipStoreBase=GRADLE_USER_HOME
6 | zipStorePath=wrapper/dists
7 | 


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/.gitignore:
--------------------------------------------------------------------------------
 1 | *.iml
 2 | .gradle
 3 | /local.properties
 4 | /.idea/caches
 5 | /.idea/libraries
 6 | /.idea/modules.xml
 7 | /.idea/workspace.xml
 8 | /.idea/navEditor.xml
 9 | /.idea/assetWizardSettings.xml
10 | .DS_Store
11 | /build
12 | /captures
13 | .externalNativeBuild
14 | .cxx
15 | local.properties
16 | .idea
17 | 


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/app/src/main/java/com/mohsen/particle/ui/theme/Color.kt:
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 1 | package com.mohsen.particle.ui.theme
 2 | 
 3 | import androidx.compose.ui.graphics.Color
 4 | 
 5 | val Purple80 = Color(0xFFD0BCFF)
 6 | val PurpleGrey80 = Color(0xFFCCC2DC)
 7 | val Pink80 = Color(0xFFEFB8C8)
 8 | 
 9 | val Purple40 = Color(0xFF6650a4)
10 | val PurpleGrey40 = Color(0xFF625b71)
11 | val Pink40 = Color(0xFF7D5260)


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/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml:
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1 | <?xml version="1.0" encoding="utf-8"?>
2 | <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
3 |     <background android:drawable="@drawable/ic_launcher_background" />
4 |     <foreground android:drawable="@drawable/ic_launcher_foreground" />
5 |     <monochrome android:drawable="@drawable/ic_launcher_foreground" />
6 | </adaptive-icon>


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/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml:
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1 | <?xml version="1.0" encoding="utf-8"?>
2 | <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
3 |     <background android:drawable="@drawable/ic_launcher_background" />
4 |     <foreground android:drawable="@drawable/ic_launcher_foreground" />
5 |     <monochrome android:drawable="@drawable/ic_launcher_foreground" />
6 | </adaptive-icon>


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/settings.gradle.kts:
--------------------------------------------------------------------------------
 1 | pluginManagement {
 2 |     repositories {
 3 |         google()
 4 |         mavenCentral()
 5 |         gradlePluginPortal()
 6 |     }
 7 | }
 8 | dependencyResolutionManagement {
 9 |     repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
10 |     repositories {
11 |         google()
12 |         mavenCentral()
13 |     }
14 | }
15 | 
16 | rootProject.name = "Particle System"
17 | include(":app")
18 |  


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/app/src/main/res/values/colors.xml:
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 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <resources>
 3 |     <color name="purple_200">#FFBB86FC</color>
 4 |     <color name="purple_500">#FF6200EE</color>
 5 |     <color name="purple_700">#FF3700B3</color>
 6 |     <color name="teal_200">#FF03DAC5</color>
 7 |     <color name="teal_700">#FF018786</color>
 8 |     <color name="black">#FF000000</color>
 9 |     <color name="white">#FFFFFFFF</color>
10 | </resources>


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/README.md:
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 1 | 
 2 | ## Particle System
 3 | 
 4 | A Particle system implemented in Android, optimized for performance
 5 | 
 6 | 
 7 | https://github.com/MohsenSoli/ParticleSystem/assets/49813874/8cb5ba53-750d-4485-9eac-d5a81f67453e
 8 | 
 9 | 
10 | 
11 | https://github.com/MohsenSoli/ParticleSystem/assets/49813874/fee4127e-4211-4f1f-a32b-7f2942eec432
12 | 
13 | 
14 | 
15 | https://github.com/MohsenSoli/ParticleSystem/assets/49813874/04b62b7e-c823-4936-a93f-53ffc5d79959
16 | 
17 | 


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/app/src/main/res/xml/backup_rules.xml:
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 1 | <?xml version="1.0" encoding="utf-8"?><!--
 2 |    Sample backup rules file; uncomment and customize as necessary.
 3 |    See https://developer.android.com/guide/topics/data/autobackup
 4 |    for details.
 5 |    Note: This file is ignored for devices older that API 31
 6 |    See https://developer.android.com/about/versions/12/backup-restore
 7 | -->
 8 | <full-backup-content>
 9 |     <!--
10 |    <include domain="sharedpref" path="."/>
11 |    <exclude domain="sharedpref" path="device.xml"/>
12 | -->
13 | </full-backup-content>


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/app/src/main/res/xml/data_extraction_rules.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?><!--
 2 |    Sample data extraction rules file; uncomment and customize as necessary.
 3 |    See https://developer.android.com/about/versions/12/backup-restore#xml-changes
 4 |    for details.
 5 | -->
 6 | <data-extraction-rules>
 7 |     <cloud-backup>
 8 |         <!-- TODO: Use <include> and <exclude> to control what is backed up.
 9 |         <include .../>
10 |         <exclude .../>
11 |         -->
12 |     </cloud-backup>
13 |     <!--
14 |     <device-transfer>
15 |         <include .../>
16 |         <exclude .../>
17 |     </device-transfer>
18 |     -->
19 | </data-extraction-rules>


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/app/src/main/java/com/mohsen/particle/MainActivity.kt:
--------------------------------------------------------------------------------
 1 | package com.mohsen.particle
 2 | 
 3 | import android.os.Bundle
 4 | import androidx.activity.ComponentActivity
 5 | 
 6 | class MainActivity : ComponentActivity() {
 7 |     private val surface by lazy { ParticleSystemView(this) }
 8 | 
 9 |     override fun onCreate(savedInstanceState: Bundle?) {
10 |         super.onCreate(savedInstanceState)
11 |         setContentView(surface)
12 |     }
13 | 
14 |     override fun onResume() {
15 |         super.onResume()
16 |         surface.isActive = true
17 |     }
18 | 
19 |     override fun onPause() {
20 |         super.onPause()
21 |         surface.isActive = false
22 |     }
23 | }


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/app/proguard-rules.pro:
--------------------------------------------------------------------------------
 1 | # Add project specific ProGuard rules here.
 2 | # You can control the set of applied configuration files using the
 3 | # proguardFiles setting in build.gradle.
 4 | #
 5 | # For more details, see
 6 | #   http://developer.android.com/guide/developing/tools/proguard.html
 7 | 
 8 | # If your project uses WebView with JS, uncomment the following
 9 | # and specify the fully qualified class name to the JavaScript interface
10 | # class:
11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
12 | #   public *;
13 | #}
14 | 
15 | # Uncomment this to preserve the line number information for
16 | # debugging stack traces.
17 | #-keepattributes SourceFile,LineNumberTable
18 | 
19 | # If you keep the line number information, uncomment this to
20 | # hide the original source file name.
21 | #-renamesourcefileattribute SourceFile


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/app/src/main/java/com/mohsen/particle/ui/theme/Type.kt:
--------------------------------------------------------------------------------
 1 | package com.mohsen.particle.ui.theme
 2 | 
 3 | import androidx.compose.material3.Typography
 4 | import androidx.compose.ui.text.TextStyle
 5 | import androidx.compose.ui.text.font.FontFamily
 6 | import androidx.compose.ui.text.font.FontWeight
 7 | import androidx.compose.ui.unit.sp
 8 | 
 9 | // Set of Material typography styles to start with
10 | val Typography = Typography(
11 |     bodyLarge = TextStyle(
12 |         fontFamily = FontFamily.Default,
13 |         fontWeight = FontWeight.Normal,
14 |         fontSize = 16.sp,
15 |         lineHeight = 24.sp,
16 |         letterSpacing = 0.5.sp
17 |     )
18 |     /* Other default text styles to override
19 |     titleLarge = TextStyle(
20 |         fontFamily = FontFamily.Default,
21 |         fontWeight = FontWeight.Normal,
22 |         fontSize = 22.sp,
23 |         lineHeight = 28.sp,
24 |         letterSpacing = 0.sp
25 |     ),
26 |     labelSmall = TextStyle(
27 |         fontFamily = FontFamily.Default,
28 |         fontWeight = FontWeight.Medium,
29 |         fontSize = 11.sp,
30 |         lineHeight = 16.sp,
31 |         letterSpacing = 0.5.sp
32 |     )
33 |     */
34 | )


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/app/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3 |     xmlns:tools="http://schemas.android.com/tools">
 4 | 
 5 |     <application
 6 |         android:allowBackup="true"
 7 |         android:dataExtractionRules="@xml/data_extraction_rules"
 8 |         android:fullBackupContent="@xml/backup_rules"
 9 |         android:icon="@mipmap/ic_launcher"
10 |         android:label="@string/app_name"
11 |         android:roundIcon="@mipmap/ic_launcher_round"
12 |         android:supportsRtl="true"
13 |         android:theme="@style/Theme.ParticleSystem"
14 |         tools:targetApi="31">
15 |         <activity
16 |             android:name="com.mohsen.particle.MainActivity"
17 |             android:exported="true"
18 |             android:label="@string/app_name"
19 |             android:theme="@style/Theme.ParticleSystem">
20 |             <intent-filter>
21 |                 <action android:name="android.intent.action.MAIN" />
22 | 
23 |                 <category android:name="android.intent.category.LAUNCHER" />
24 |             </intent-filter>
25 |         </activity>
26 |     </application>
27 | 
28 | </manifest>


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/app/src/main/java/com/mohsen/particle/MySurface.kt:
--------------------------------------------------------------------------------
 1 | package com.mohsen.particle
 2 | 
 3 | import android.content.Context
 4 | import android.graphics.Color
 5 | import android.graphics.Paint
 6 | import android.view.SurfaceHolder
 7 | import android.view.SurfaceView
 8 | 
 9 | class MySurface(context: Context): SurfaceView(context), SurfaceHolder.Callback {
10 | 
11 |     private val paint: Paint = Paint().apply {
12 |         color = Color.RED
13 |     }
14 | 
15 |     init {
16 |         holder.addCallback(this)
17 |     }
18 | 
19 |     override fun surfaceCreated(holder: SurfaceHolder) {
20 | 
21 |     }
22 | 
23 |     override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) {
24 |         // This is called when the size or format of the surface changes.
25 |     }
26 | 
27 |     override fun surfaceDestroyed(holder: SurfaceHolder) {
28 |         // This is called when the surface is destroyed.
29 |     }
30 | 
31 |     fun drawRect() {
32 |         val canvas = holder.lockCanvas()
33 |         canvas?.let {
34 |             // Draw a red rectangle
35 |             it.drawRect(width.toFloat()/2, height.toFloat() / 2, width.toFloat(), height.toFloat(), paint)
36 | 
37 |             // Unlock the canvas to show the changes
38 |             holder.unlockCanvasAndPost(it)
39 |         }
40 |     }
41 | }


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/gradle.properties:
--------------------------------------------------------------------------------
 1 | # Project-wide Gradle settings.
 2 | # IDE (e.g. Android Studio) users:
 3 | # Gradle settings configured through the IDE *will override*
 4 | # any settings specified in this file.
 5 | # For more details on how to configure your build environment visit
 6 | # http://www.gradle.org/docs/current/userguide/build_environment.html
 7 | # Specifies the JVM arguments used for the daemon process.
 8 | # The setting is particularly useful for tweaking memory settings.
 9 | org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
10 | # When configured, Gradle will run in incubating parallel mode.
11 | # This option should only be used with decoupled projects. More details, visit
12 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
13 | # org.gradle.parallel=true
14 | # AndroidX package structure to make it clearer which packages are bundled with the
15 | # Android operating system, and which are packaged with your app's APK
16 | # https://developer.android.com/topic/libraries/support-library/androidx-rn
17 | android.useAndroidX=true
18 | # Kotlin code style for this project: "official" or "obsolete":
19 | kotlin.code.style=official
20 | # Enables namespacing of each library's R class so that its R class includes only the
21 | # resources declared in the library itself and none from the library's dependencies,
22 | # thereby reducing the size of the R class for that library
23 | android.nonTransitiveRClass=true


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/app/src/main/res/drawable/ic_launcher_foreground.xml:
--------------------------------------------------------------------------------
 1 | <vector xmlns:android="http://schemas.android.com/apk/res/android"
 2 |     xmlns:aapt="http://schemas.android.com/aapt"
 3 |     android:width="108dp"
 4 |     android:height="108dp"
 5 |     android:viewportWidth="108"
 6 |     android:viewportHeight="108">
 7 |     <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
 8 |         <aapt:attr name="android:fillColor">
 9 |             <gradient
10 |                 android:endX="85.84757"
11 |                 android:endY="92.4963"
12 |                 android:startX="42.9492"
13 |                 android:startY="49.59793"
14 |                 android:type="linear">
15 |                 <item
16 |                     android:color="#44000000"
17 |                     android:offset="0.0" />
18 |                 <item
19 |                     android:color="#00000000"
20 |                     android:offset="1.0" />
21 |             </gradient>
22 |         </aapt:attr>
23 |     </path>
24 |     <path
25 |         android:fillColor="#FFFFFF"
26 |         android:fillType="nonZero"
27 |         android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
28 |         android:strokeWidth="1"
29 |         android:strokeColor="#00000000" />
30 | </vector>


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/app/src/main/java/com/mohsen/particle/ParticlePool.kt:
--------------------------------------------------------------------------------
 1 | package com.mohsen.particle
 2 | 
 3 | import java.util.LinkedList
 4 | 
 5 | class ParticlePool(private val maxParticles: Int) {
 6 | 
 7 |     private val particles = LinkedList<Particle>()
 8 | 
 9 |     init {
10 |         repeat(maxParticles) {
11 |             particles.add(Particle())
12 |         }
13 |     }
14 | 
15 |     fun getParticle(
16 |         x: Float,
17 |         y: Float,
18 |         velocityX: Float,
19 |         velocityY: Float,
20 |         size: Float
21 |     ): Particle? {
22 | 
23 |         if (particles.isEmpty()) {
24 |             return Particle(
25 |                 x = x,
26 |                 y = y,
27 |                 velocityX = velocityX,
28 |                 velocityY = velocityY,
29 |                 size = size
30 |             )
31 |         }
32 | 
33 |         // Double check locking
34 |         synchronized(particles) {
35 |             if (particles.isEmpty()) {
36 |                 return Particle(
37 |                     x = x,
38 |                     y = y,
39 |                     velocityX = velocityX,
40 |                     velocityY = velocityY,
41 |                     size = size
42 |                 )
43 |             }
44 |             return particles.removeFirst().also {
45 |                 it.reset(
46 |                     x = x,
47 |                     y = y,
48 |                     velocityX = velocityX,
49 |                     velocityY = velocityY,
50 |                     size = size
51 |                 )
52 |             }
53 |         }
54 |     }
55 | 
56 |     fun releaseParticle(particle: Particle) {
57 |         if (particles.size < maxParticles) {
58 |             particles.add(particle)
59 |         }
60 |     }
61 | }
62 | 
63 | private fun Particle.reset(
64 |     x: Float,
65 |     y: Float,
66 |     velocityX: Float,
67 |     velocityY: Float,
68 |     size: Float
69 | ) = apply {
70 |     this.x = x
71 |     this.y = y
72 |     this.velocityX = velocityX
73 |     this.velocityY = velocityY
74 |     this.size = size
75 | }


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/app/build.gradle.kts:
--------------------------------------------------------------------------------
 1 | plugins {
 2 |     id("com.android.application")
 3 |     id("org.jetbrains.kotlin.android")
 4 | }
 5 | 
 6 | android {
 7 |     namespace = "com.mohsen.particle"
 8 |     compileSdk = 34
 9 | 
10 |     defaultConfig {
11 |         applicationId = "com.mohsen.particle"
12 |         minSdk = 24
13 |         targetSdk = 33
14 |         versionCode = 1
15 |         versionName = "1.0"
16 | 
17 |         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
18 |         vectorDrawables {
19 |             useSupportLibrary = true
20 |         }
21 |     }
22 | 
23 |     buildTypes {
24 |         release {
25 |             isMinifyEnabled = false
26 |             proguardFiles(
27 |                 getDefaultProguardFile("proguard-android-optimize.txt"),
28 |                 "proguard-rules.pro"
29 |             )
30 |         }
31 |     }
32 |     compileOptions {
33 |         sourceCompatibility = JavaVersion.VERSION_1_8
34 |         targetCompatibility = JavaVersion.VERSION_1_8
35 |     }
36 |     kotlinOptions {
37 |         jvmTarget = "1.8"
38 |     }
39 |     buildFeatures {
40 |         compose = true
41 |     }
42 |     composeOptions {
43 |         kotlinCompilerExtensionVersion = "1.4.3"
44 |     }
45 |     packaging {
46 |         resources {
47 |             excludes += "/META-INF/{AL2.0,LGPL2.1}"
48 |         }
49 |     }
50 | }
51 | 
52 | dependencies {
53 | 
54 |     implementation("androidx.core:core-ktx:1.9.0")
55 |     implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.6.2")
56 |     implementation("androidx.activity:activity-compose:1.8.1")
57 |     implementation(platform("androidx.compose:compose-bom:2023.03.00"))
58 |     implementation("androidx.compose.ui:ui")
59 |     implementation("androidx.compose.ui:ui-graphics")
60 |     implementation("androidx.compose.ui:ui-tooling-preview")
61 |     implementation("androidx.compose.material3:material3")
62 |     testImplementation("junit:junit:4.13.2")
63 |     androidTestImplementation("androidx.test.ext:junit:1.1.5")
64 |     androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
65 |     androidTestImplementation(platform("androidx.compose:compose-bom:2023.03.00"))
66 |     androidTestImplementation("androidx.compose.ui:ui-test-junit4")
67 |     debugImplementation("androidx.compose.ui:ui-tooling")
68 |     debugImplementation("androidx.compose.ui:ui-test-manifest")
69 | }


--------------------------------------------------------------------------------
/app/src/main/java/com/mohsen/particle/ui/theme/Theme.kt:
--------------------------------------------------------------------------------
 1 | package com.mohsen.particle.ui.theme
 2 | 
 3 | import android.app.Activity
 4 | import android.os.Build
 5 | import androidx.compose.foundation.isSystemInDarkTheme
 6 | import androidx.compose.material3.MaterialTheme
 7 | import androidx.compose.material3.darkColorScheme
 8 | import androidx.compose.material3.dynamicDarkColorScheme
 9 | import androidx.compose.material3.dynamicLightColorScheme
10 | import androidx.compose.material3.lightColorScheme
11 | import androidx.compose.runtime.Composable
12 | import androidx.compose.runtime.SideEffect
13 | import androidx.compose.ui.graphics.toArgb
14 | import androidx.compose.ui.platform.LocalContext
15 | import androidx.compose.ui.platform.LocalView
16 | import androidx.core.view.WindowCompat
17 | 
18 | private val DarkColorScheme = darkColorScheme(
19 |     primary = Purple80,
20 |     secondary = PurpleGrey80,
21 |     tertiary = Pink80
22 | )
23 | 
24 | private val LightColorScheme = lightColorScheme(
25 |     primary = Purple40,
26 |     secondary = PurpleGrey40,
27 |     tertiary = Pink40
28 | 
29 |     /* Other default colors to override
30 |     background = Color(0xFFFFFBFE),
31 |     surface = Color(0xFFFFFBFE),
32 |     onPrimary = Color.White,
33 |     onSecondary = Color.White,
34 |     onTertiary = Color.White,
35 |     onBackground = Color(0xFF1C1B1F),
36 |     onSurface = Color(0xFF1C1B1F),
37 |     */
38 | )
39 | 
40 | @Composable
41 | fun ParticleSysTheme(
42 |     darkTheme: Boolean = isSystemInDarkTheme(),
43 |     // Dynamic color is available on Android 12+
44 |     dynamicColor: Boolean = true,
45 |     content: @Composable () -> Unit
46 | ) {
47 |     val colorScheme = when {
48 |         dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
49 |             val context = LocalContext.current
50 |             if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
51 |         }
52 | 
53 |         darkTheme -> DarkColorScheme
54 |         else -> LightColorScheme
55 |     }
56 |     val view = LocalView.current
57 |     if (!view.isInEditMode) {
58 |         SideEffect {
59 |             val window = (view.context as Activity).window
60 |             window.statusBarColor = colorScheme.primary.toArgb()
61 |             WindowCompat.getInsetsController(window, view).isAppearanceLightStatusBars = darkTheme
62 |         }
63 |     }
64 | 
65 |     MaterialTheme(
66 |         colorScheme = colorScheme,
67 |         typography = Typography,
68 |         content = content
69 |     )
70 | }


--------------------------------------------------------------------------------
/gradlew.bat:
--------------------------------------------------------------------------------
 1 | @rem
 2 | @rem Copyright 2015 the original author or authors.
 3 | @rem
 4 | @rem Licensed under the Apache License, Version 2.0 (the "License");
 5 | @rem you may not use this file except in compliance with the License.
 6 | @rem You may obtain a copy of the License at
 7 | @rem
 8 | @rem      https://www.apache.org/licenses/LICENSE-2.0
 9 | @rem
10 | @rem Unless required by applicable law or agreed to in writing, software
11 | @rem distributed under the License is distributed on an "AS IS" BASIS,
12 | @rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | @rem See the License for the specific language governing permissions and
14 | @rem limitations under the License.
15 | @rem
16 | 
17 | @if "%DEBUG%" == "" @echo off
18 | @rem ##########################################################################
19 | @rem
20 | @rem  Gradle startup script for Windows
21 | @rem
22 | @rem ##########################################################################
23 | 
24 | @rem Set local scope for the variables with windows NT shell
25 | if "%OS%"=="Windows_NT" setlocal
26 | 
27 | set DIRNAME=%~dp0
28 | if "%DIRNAME%" == "" set DIRNAME=.
29 | set APP_BASE_NAME=%~n0
30 | set APP_HOME=%DIRNAME%
31 | 
32 | @rem Resolve any "." and ".." in APP_HOME to make it shorter.
33 | for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
34 | 
35 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
36 | set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
37 | 
38 | @rem Find java.exe
39 | if defined JAVA_HOME goto findJavaFromJavaHome
40 | 
41 | set JAVA_EXE=java.exe
42 | %JAVA_EXE% -version >NUL 2>&1
43 | if "%ERRORLEVEL%" == "0" goto execute
44 | 
45 | echo.
46 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
47 | echo.
48 | echo Please set the JAVA_HOME variable in your environment to match the
49 | echo location of your Java installation.
50 | 
51 | goto fail
52 | 
53 | :findJavaFromJavaHome
54 | set JAVA_HOME=%JAVA_HOME:"=%
55 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe
56 | 
57 | if exist "%JAVA_EXE%" goto execute
58 | 
59 | echo.
60 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
61 | echo.
62 | echo Please set the JAVA_HOME variable in your environment to match the
63 | echo location of your Java installation.
64 | 
65 | goto fail
66 | 
67 | :execute
68 | @rem Setup the command line
69 | 
70 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
71 | 
72 | 
73 | @rem Execute Gradle
74 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
75 | 
76 | :end
77 | @rem End local scope for the variables with windows NT shell
78 | if "%ERRORLEVEL%"=="0" goto mainEnd
79 | 
80 | :fail
81 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
82 | rem the _cmd.exe /c_ return code!
83 | if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
84 | exit /b 1
85 | 
86 | :mainEnd
87 | if "%OS%"=="Windows_NT" endlocal
88 | 
89 | :omega
90 | 


--------------------------------------------------------------------------------
/app/src/main/java/com/mohsen/particle/Particle.kt:
--------------------------------------------------------------------------------
 1 | package com.mohsen.particle
 2 | 
 3 | import kotlin.math.abs
 4 | import kotlin.math.pow
 5 | import kotlin.math.sqrt
 6 | 
 7 | data class Particle(
 8 |     var x: Float = 0f,
 9 |     var y: Float = 0f,
10 |     var velocityX: Float = 0f,
11 |     var velocityY: Float = 0f,
12 |     var size: Float = 0f,
13 | ) {
14 | 
15 |     private val mass get() = size.pow(2)
16 | 
17 |     fun isCollidingWith(other: Particle): Boolean {
18 |         val distance = sqrt((x - other.x).pow(2f) + (abs(y - other.y)).pow(2f))
19 | 
20 |         // check collision in the next frame
21 |         val nX = x + velocityX
22 |         val nY = y + velocityY
23 |         val oNX = other.x + other.velocityX
24 |         val oNY = other.y + other.velocityY
25 |         val nDistance = sqrt((nX - oNX).pow(2f) + (abs(nY - oNY)).pow(2f))
26 | 
27 |         return distance < size + other.size || nDistance < size + other.size
28 |     }
29 | 
30 |     fun correctPosition(other: Particle) {
31 |         val overlap = size + other.size - distanceBetween(other)
32 |         val directionX = (x - other.x) / distanceBetween(other)
33 |         val directionY = (y - other.y) / distanceBetween(other)
34 |         val normalOverlap = overlap / (size + other.size)
35 | 
36 |         if (overlap > 0) {
37 |             x += directionX * other.size * normalOverlap / 2
38 |             y += directionY * other.size * normalOverlap / 2
39 |             other.x -= directionX * size * normalOverlap / 2
40 |             other.y -= directionY * size * normalOverlap / 2
41 |         }
42 |     }
43 | 
44 |     private fun distanceBetween(other: Particle): Float {
45 |         return sqrt((x - other.x).pow(2f) + (y - other.y).pow(2f))
46 |     }
47 | 
48 |     fun handleCollisionWith(other: Particle) {
49 |         // Calculate the normalized collision vector
50 |         val collisionVectorX = other.x - x
51 |         val collisionVectorY = other.y - y
52 |         val collisionVectorLength = sqrt(
53 |             collisionVectorX.pow(2.0f) + collisionVectorY.pow(2.0f)
54 |         )
55 |         val collisionNormalX = collisionVectorX / collisionVectorLength
56 |         val collisionNormalY = collisionVectorY / collisionVectorLength
57 | 
58 |         // Calculate relative velocity
59 |         val relativeVelocityX = other.velocityX - velocityX
60 |         val relativeVelocityY = other.velocityY - velocityY
61 | 
62 |         // Calculate the dot product of relative velocity and collision normal
63 |         val dotProduct = relativeVelocityX * collisionNormalX + relativeVelocityY * collisionNormalY
64 | 
65 |         // Calculate the impulse (change in velocity) along the collision normal
66 |         val impulse = (2.0f * dotProduct) / (mass + other.mass)
67 | 
68 |         // Apply the impulse to the velocities
69 |         velocityX += impulse * other.mass * collisionNormalX
70 |         velocityY += impulse * other.mass * collisionNormalY
71 |         other.velocityX -= impulse * mass * collisionNormalX
72 |         other.velocityY -= impulse * mass * collisionNormalY
73 |     }
74 | 
75 |     fun handleCollisionWith2(other: Particle) {
76 |         val allMass = mass + other.mass
77 | 
78 |         val finalVx = ((mass - other.mass) * velocityX + 2 * other.mass * other.velocityX) / allMass
79 |         val finalOtherVx = ((other.mass - mass) * other.velocityX + 2 * mass * velocityX) / allMass
80 | 
81 |         val finalVy = ((mass - other.mass) * velocityY + 2 * other.mass * other.velocityY) / allMass
82 |         val finalOtherVy = ((other.mass - mass) * other.velocityY + 2 * mass * velocityY) / allMass
83 | 
84 |         velocityX = finalVx
85 |         velocityY = finalVy
86 | 
87 |         other.velocityX = finalOtherVx
88 |         other.velocityY = finalOtherVy
89 |     }
90 | }


--------------------------------------------------------------------------------
/app/src/main/res/drawable/ic_launcher_background.xml:
--------------------------------------------------------------------------------
  1 | <?xml version="1.0" encoding="utf-8"?>
  2 | <vector xmlns:android="http://schemas.android.com/apk/res/android"
  3 |     android:width="108dp"
  4 |     android:height="108dp"
  5 |     android:viewportWidth="108"
  6 |     android:viewportHeight="108">
  7 |     <path
  8 |         android:fillColor="#3DDC84"
  9 |         android:pathData="M0,0h108v108h-108z" />
 10 |     <path
 11 |         android:fillColor="#00000000"
 12 |         android:pathData="M9,0L9,108"
 13 |         android:strokeWidth="0.8"
 14 |         android:strokeColor="#33FFFFFF" />
 15 |     <path
 16 |         android:fillColor="#00000000"
 17 |         android:pathData="M19,0L19,108"
 18 |         android:strokeWidth="0.8"
 19 |         android:strokeColor="#33FFFFFF" />
 20 |     <path
 21 |         android:fillColor="#00000000"
 22 |         android:pathData="M29,0L29,108"
 23 |         android:strokeWidth="0.8"
 24 |         android:strokeColor="#33FFFFFF" />
 25 |     <path
 26 |         android:fillColor="#00000000"
 27 |         android:pathData="M39,0L39,108"
 28 |         android:strokeWidth="0.8"
 29 |         android:strokeColor="#33FFFFFF" />
 30 |     <path
 31 |         android:fillColor="#00000000"
 32 |         android:pathData="M49,0L49,108"
 33 |         android:strokeWidth="0.8"
 34 |         android:strokeColor="#33FFFFFF" />
 35 |     <path
 36 |         android:fillColor="#00000000"
 37 |         android:pathData="M59,0L59,108"
 38 |         android:strokeWidth="0.8"
 39 |         android:strokeColor="#33FFFFFF" />
 40 |     <path
 41 |         android:fillColor="#00000000"
 42 |         android:pathData="M69,0L69,108"
 43 |         android:strokeWidth="0.8"
 44 |         android:strokeColor="#33FFFFFF" />
 45 |     <path
 46 |         android:fillColor="#00000000"
 47 |         android:pathData="M79,0L79,108"
 48 |         android:strokeWidth="0.8"
 49 |         android:strokeColor="#33FFFFFF" />
 50 |     <path
 51 |         android:fillColor="#00000000"
 52 |         android:pathData="M89,0L89,108"
 53 |         android:strokeWidth="0.8"
 54 |         android:strokeColor="#33FFFFFF" />
 55 |     <path
 56 |         android:fillColor="#00000000"
 57 |         android:pathData="M99,0L99,108"
 58 |         android:strokeWidth="0.8"
 59 |         android:strokeColor="#33FFFFFF" />
 60 |     <path
 61 |         android:fillColor="#00000000"
 62 |         android:pathData="M0,9L108,9"
 63 |         android:strokeWidth="0.8"
 64 |         android:strokeColor="#33FFFFFF" />
 65 |     <path
 66 |         android:fillColor="#00000000"
 67 |         android:pathData="M0,19L108,19"
 68 |         android:strokeWidth="0.8"
 69 |         android:strokeColor="#33FFFFFF" />
 70 |     <path
 71 |         android:fillColor="#00000000"
 72 |         android:pathData="M0,29L108,29"
 73 |         android:strokeWidth="0.8"
 74 |         android:strokeColor="#33FFFFFF" />
 75 |     <path
 76 |         android:fillColor="#00000000"
 77 |         android:pathData="M0,39L108,39"
 78 |         android:strokeWidth="0.8"
 79 |         android:strokeColor="#33FFFFFF" />
 80 |     <path
 81 |         android:fillColor="#00000000"
 82 |         android:pathData="M0,49L108,49"
 83 |         android:strokeWidth="0.8"
 84 |         android:strokeColor="#33FFFFFF" />
 85 |     <path
 86 |         android:fillColor="#00000000"
 87 |         android:pathData="M0,59L108,59"
 88 |         android:strokeWidth="0.8"
 89 |         android:strokeColor="#33FFFFFF" />
 90 |     <path
 91 |         android:fillColor="#00000000"
 92 |         android:pathData="M0,69L108,69"
 93 |         android:strokeWidth="0.8"
 94 |         android:strokeColor="#33FFFFFF" />
 95 |     <path
 96 |         android:fillColor="#00000000"
 97 |         android:pathData="M0,79L108,79"
 98 |         android:strokeWidth="0.8"
 99 |         android:strokeColor="#33FFFFFF" />
100 |     <path
101 |         android:fillColor="#00000000"
102 |         android:pathData="M0,89L108,89"
103 |         android:strokeWidth="0.8"
104 |         android:strokeColor="#33FFFFFF" />
105 |     <path
106 |         android:fillColor="#00000000"
107 |         android:pathData="M0,99L108,99"
108 |         android:strokeWidth="0.8"
109 |         android:strokeColor="#33FFFFFF" />
110 |     <path
111 |         android:fillColor="#00000000"
112 |         android:pathData="M19,29L89,29"
113 |         android:strokeWidth="0.8"
114 |         android:strokeColor="#33FFFFFF" />
115 |     <path
116 |         android:fillColor="#00000000"
117 |         android:pathData="M19,39L89,39"
118 |         android:strokeWidth="0.8"
119 |         android:strokeColor="#33FFFFFF" />
120 |     <path
121 |         android:fillColor="#00000000"
122 |         android:pathData="M19,49L89,49"
123 |         android:strokeWidth="0.8"
124 |         android:strokeColor="#33FFFFFF" />
125 |     <path
126 |         android:fillColor="#00000000"
127 |         android:pathData="M19,59L89,59"
128 |         android:strokeWidth="0.8"
129 |         android:strokeColor="#33FFFFFF" />
130 |     <path
131 |         android:fillColor="#00000000"
132 |         android:pathData="M19,69L89,69"
133 |         android:strokeWidth="0.8"
134 |         android:strokeColor="#33FFFFFF" />
135 |     <path
136 |         android:fillColor="#00000000"
137 |         android:pathData="M19,79L89,79"
138 |         android:strokeWidth="0.8"
139 |         android:strokeColor="#33FFFFFF" />
140 |     <path
141 |         android:fillColor="#00000000"
142 |         android:pathData="M29,19L29,89"
143 |         android:strokeWidth="0.8"
144 |         android:strokeColor="#33FFFFFF" />
145 |     <path
146 |         android:fillColor="#00000000"
147 |         android:pathData="M39,19L39,89"
148 |         android:strokeWidth="0.8"
149 |         android:strokeColor="#33FFFFFF" />
150 |     <path
151 |         android:fillColor="#00000000"
152 |         android:pathData="M49,19L49,89"
153 |         android:strokeWidth="0.8"
154 |         android:strokeColor="#33FFFFFF" />
155 |     <path
156 |         android:fillColor="#00000000"
157 |         android:pathData="M59,19L59,89"
158 |         android:strokeWidth="0.8"
159 |         android:strokeColor="#33FFFFFF" />
160 |     <path
161 |         android:fillColor="#00000000"
162 |         android:pathData="M69,19L69,89"
163 |         android:strokeWidth="0.8"
164 |         android:strokeColor="#33FFFFFF" />
165 |     <path
166 |         android:fillColor="#00000000"
167 |         android:pathData="M79,19L79,89"
168 |         android:strokeWidth="0.8"
169 |         android:strokeColor="#33FFFFFF" />
170 | </vector>
171 | 


--------------------------------------------------------------------------------
/gradlew:
--------------------------------------------------------------------------------
  1 | #!/usr/bin/env sh
  2 | 
  3 | #
  4 | # Copyright 2015 the original author or authors.
  5 | #
  6 | # Licensed under the Apache License, Version 2.0 (the "License");
  7 | # you may not use this file except in compliance with the License.
  8 | # You may obtain a copy of the License at
  9 | #
 10 | #      https://www.apache.org/licenses/LICENSE-2.0
 11 | #
 12 | # Unless required by applicable law or agreed to in writing, software
 13 | # distributed under the License is distributed on an "AS IS" BASIS,
 14 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 15 | # See the License for the specific language governing permissions and
 16 | # limitations under the License.
 17 | #
 18 | 
 19 | ##############################################################################
 20 | ##
 21 | ##  Gradle start up script for UN*X
 22 | ##
 23 | ##############################################################################
 24 | 
 25 | # Attempt to set APP_HOME
 26 | # Resolve links: $0 may be a link
 27 | PRG="$0"
 28 | # Need this for relative symlinks.
 29 | while [ -h "$PRG" ] ; do
 30 |     ls=`ls -ld "$PRG"`
 31 |     link=`expr "$ls" : '.*-> \(.*\)$'`
 32 |     if expr "$link" : '/.*' > /dev/null; then
 33 |         PRG="$link"
 34 |     else
 35 |         PRG=`dirname "$PRG"`"/$link"
 36 |     fi
 37 | done
 38 | SAVED="`pwd`"
 39 | cd "`dirname \"$PRG\"`/" >/dev/null
 40 | APP_HOME="`pwd -P`"
 41 | cd "$SAVED" >/dev/null
 42 | 
 43 | APP_NAME="Gradle"
 44 | APP_BASE_NAME=`basename "$0"`
 45 | 
 46 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 47 | DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 48 | 
 49 | # Use the maximum available, or set MAX_FD != -1 to use that value.
 50 | MAX_FD="maximum"
 51 | 
 52 | warn () {
 53 |     echo "$*"
 54 | }
 55 | 
 56 | die () {
 57 |     echo
 58 |     echo "$*"
 59 |     echo
 60 |     exit 1
 61 | }
 62 | 
 63 | # OS specific support (must be 'true' or 'false').
 64 | cygwin=false
 65 | msys=false
 66 | darwin=false
 67 | nonstop=false
 68 | case "`uname`" in
 69 |   CYGWIN* )
 70 |     cygwin=true
 71 |     ;;
 72 |   Darwin* )
 73 |     darwin=true
 74 |     ;;
 75 |   MINGW* )
 76 |     msys=true
 77 |     ;;
 78 |   NONSTOP* )
 79 |     nonstop=true
 80 |     ;;
 81 | esac
 82 | 
 83 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 84 | 
 85 | 
 86 | # Determine the Java command to use to start the JVM.
 87 | if [ -n "$JAVA_HOME" ] ; then
 88 |     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
 89 |         # IBM's JDK on AIX uses strange locations for the executables
 90 |         JAVACMD="$JAVA_HOME/jre/sh/java"
 91 |     else
 92 |         JAVACMD="$JAVA_HOME/bin/java"
 93 |     fi
 94 |     if [ ! -x "$JAVACMD" ] ; then
 95 |         die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
 96 | 
 97 | Please set the JAVA_HOME variable in your environment to match the
 98 | location of your Java installation."
 99 |     fi
100 | else
101 |     JAVACMD="java"
102 |     which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
103 | 
104 | Please set the JAVA_HOME variable in your environment to match the
105 | location of your Java installation."
106 | fi
107 | 
108 | # Increase the maximum file descriptors if we can.
109 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
110 |     MAX_FD_LIMIT=`ulimit -H -n`
111 |     if [ $? -eq 0 ] ; then
112 |         if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
113 |             MAX_FD="$MAX_FD_LIMIT"
114 |         fi
115 |         ulimit -n $MAX_FD
116 |         if [ $? -ne 0 ] ; then
117 |             warn "Could not set maximum file descriptor limit: $MAX_FD"
118 |         fi
119 |     else
120 |         warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
121 |     fi
122 | fi
123 | 
124 | # For Darwin, add options to specify how the application appears in the dock
125 | if $darwin; then
126 |     GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
127 | fi
128 | 
129 | # For Cygwin or MSYS, switch paths to Windows format before running java
130 | if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
131 |     APP_HOME=`cygpath --path --mixed "$APP_HOME"`
132 |     CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
133 | 
134 |     JAVACMD=`cygpath --unix "$JAVACMD"`
135 | 
136 |     # We build the pattern for arguments to be converted via cygpath
137 |     ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
138 |     SEP=""
139 |     for dir in $ROOTDIRSRAW ; do
140 |         ROOTDIRS="$ROOTDIRS$SEP$dir"
141 |         SEP="|"
142 |     done
143 |     OURCYGPATTERN="(^($ROOTDIRS))"
144 |     # Add a user-defined pattern to the cygpath arguments
145 |     if [ "$GRADLE_CYGPATTERN" != "" ] ; then
146 |         OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
147 |     fi
148 |     # Now convert the arguments - kludge to limit ourselves to /bin/sh
149 |     i=0
150 |     for arg in "$@" ; do
151 |         CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
152 |         CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
153 | 
154 |         if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
155 |             eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
156 |         else
157 |             eval `echo args$i`="\"$arg\""
158 |         fi
159 |         i=`expr $i + 1`
160 |     done
161 |     case $i in
162 |         0) set -- ;;
163 |         1) set -- "$args0" ;;
164 |         2) set -- "$args0" "$args1" ;;
165 |         3) set -- "$args0" "$args1" "$args2" ;;
166 |         4) set -- "$args0" "$args1" "$args2" "$args3" ;;
167 |         5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
168 |         6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
169 |         7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
170 |         8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
171 |         9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
172 |     esac
173 | fi
174 | 
175 | # Escape application args
176 | save () {
177 |     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
178 |     echo " "
179 | }
180 | APP_ARGS=`save "$@"`
181 | 
182 | # Collect all arguments for the java command, following the shell quoting and substitution rules
183 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
184 | 
185 | exec "$JAVACMD" "$@"
186 | 


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/app/src/main/java/com/mohsen/particle/ParticleSystemView.kt:
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  1 | package com.mohsen.particle
  2 | 
  3 | import android.annotation.SuppressLint
  4 | import android.content.Context
  5 | import android.content.res.TypedArray
  6 | import android.graphics.Canvas
  7 | import android.graphics.Color
  8 | import android.graphics.Paint
  9 | import android.graphics.Typeface
 10 | import android.util.AttributeSet
 11 | import android.util.Log
 12 | import android.view.MotionEvent
 13 | import android.view.SurfaceHolder
 14 | import android.view.SurfaceView
 15 | import kotlinx.coroutines.CoroutineScope
 16 | import kotlinx.coroutines.Dispatchers
 17 | import kotlinx.coroutines.delay
 18 | import kotlinx.coroutines.launch
 19 | import java.util.Collections
 20 | import java.util.LinkedList
 21 | import kotlin.math.pow
 22 | import kotlin.random.Random
 23 | 
 24 | 
 25 | class ParticleSystemView @JvmOverloads constructor(
 26 |     context: Context,
 27 |     attrs: AttributeSet? = null,
 28 |     defStyleAttr: Int = 0
 29 | ) : SurfaceView(context, attrs, defStyleAttr), SurfaceHolder.Callback {
 30 | 
 31 |     private val surfaceHolder: SurfaceHolder = holder
 32 |     private val pool = ParticlePool(5000)
 33 |     private val particleList = Collections.synchronizedList(LinkedList<Particle>())
 34 |     private val paint: Paint = Paint()
 35 |     private val textPaint = Paint().apply {
 36 |         textSize = 50f
 37 |         color = Color.WHITE
 38 |         typeface = Typeface.DEFAULT_BOLD
 39 |         setShadowLayer(3f, 3f, 3f, Color.DKGRAY)
 40 |     }
 41 | 
 42 |     private val gridSizePixel = 30
 43 |     private val grid: Array<Array<MutableList<Particle>>> by lazy {
 44 |         Array(width / gridSizePixel) { Array(height / gridSizePixel) { mutableListOf() } }
 45 |     }
 46 | 
 47 |     private val scope = CoroutineScope(Dispatchers.Default)
 48 |     var isActive = false
 49 | 
 50 |     init {
 51 |         surfaceHolder.addCallback(this)
 52 |     }
 53 | 
 54 |     override fun surfaceCreated(holder: SurfaceHolder) {
 55 |         addParticles()
 56 |         startParticleSystem()
 57 |     }
 58 | 
 59 |     override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) {}
 60 | 
 61 |     override fun surfaceDestroyed(holder: SurfaceHolder) {
 62 |         stopParticleSystem()
 63 |     }
 64 | 
 65 |     @SuppressLint("ClickableViewAccessibility")
 66 |     override fun onTouchEvent(event: MotionEvent?): Boolean {
 67 |         val styledAttributes: TypedArray = context.theme.obtainStyledAttributes(
 68 |             intArrayOf(android.R.attr.actionBarSize)
 69 |         )
 70 |         // getting event.y on a thread other than main, adds action bar height !!!!!!!
 71 |         val actionBarSize = styledAttributes.getDimension(0, 0f).toInt()
 72 |         styledAttributes.recycle()
 73 | 
 74 |         scope.launch {
 75 |             when (event?.action) {
 76 |                 MotionEvent.ACTION_DOWN, MotionEvent.ACTION_MOVE -> {
 77 |                     createParticles(event.x, event.y - actionBarSize)
 78 |                 }
 79 |             }
 80 |         }
 81 |         return true
 82 |     }
 83 | 
 84 |     private fun startParticleSystem() {
 85 |         scope.launch {
 86 |             while (isActive) {
 87 |                 drawParticles()
 88 |                 delay(8)
 89 |             }
 90 |         }
 91 |     }
 92 | 
 93 |     private fun stopParticleSystem() {
 94 |         isActive = false
 95 |     }
 96 | 
 97 |     private fun drawParticles() {
 98 |         val canvas = surfaceHolder.lockCanvas()
 99 |         canvas?.let { cnv ->
100 |             cnv.drawColor(Color.BLACK)
101 |             cnv.drawText("Count : ${particleList.size}", 25f, 60f, textPaint)
102 |             grid.forEach { column -> column.forEach { cell -> cell.clear() } }
103 |             synchronized(particleList) {
104 |                 addOrRemove()
105 |                 particleList.forEach { particle ->
106 |                     paint.color = particle.getColor()
107 |                     particle.update()
108 | 
109 |                     drawLines(particle, canvas)
110 |                     cnv.drawCircle(particle.x, particle.y, particle.size, paint)
111 |                     if (particle.x < 400 && particle.y < 200) {
112 |                         cnv.drawText("Count : ${particleList.size}", 25f, 60f, textPaint)
113 |                     }
114 |                 }
115 |             }
116 |             Log.d("ParticleSystem", "Count : ${particleList.size}")
117 |             surfaceHolder.unlockCanvasAndPost(cnv)
118 |         }
119 |     }
120 | 
121 |     private fun Particle.getColor(): Int {
122 |         val r = (x * 256 / width).toInt().coerceIn(0, 255)
123 |         val g = ((height - y) * 256 / height).toInt().coerceIn(0, 255)
124 |         val b = (size.pow(2)).toInt().coerceIn(0, 255)
125 |         return rgb(
126 |             r = r,
127 |             g = g,
128 |             b = b
129 |         )
130 |     }
131 | 
132 |     private fun drawLines(particle: Particle, canvas: Canvas) {
133 |         if (particle.size > 15) {
134 |             particle.getNearbyParticles(4).forEach { otherParticle ->
135 |                 if (otherParticle.size < 15) {
136 |                     canvas.drawLine(particle.x, particle.y, otherParticle.x, otherParticle.y, paint)
137 |                 }
138 |             }
139 |         }
140 |     }
141 | 
142 |     private fun addOrRemove() {
143 |         val iterator = particleList.iterator()
144 |         while (iterator.hasNext()) {
145 |             val particle = iterator.next()
146 |             val isOut = particle.isOutOfScreen()
147 |             if (isOut) {
148 |                 pool.releaseParticle(particle)
149 |                 iterator.remove()
150 |             } else {
151 |                 addParticleToGrid(particle)
152 |             }
153 |         }
154 |     }
155 | 
156 | 
157 |     private fun Particle.update() {
158 |         x += velocityX
159 |         y += velocityY
160 | 
161 |         if (x <= 0) {
162 |             velocityX = -velocityX
163 |             x = 0f
164 |         } else if (x >= width) {
165 |             velocityX = -velocityX
166 |             x = width.toFloat()
167 |         }
168 | 
169 |         if (y <= 0) {
170 |             velocityY = -velocityY
171 |             y = 0f
172 |         } else if (y >= height) {
173 |             velocityY = -velocityY
174 |             y = height.toFloat()
175 |         }
176 | 
177 |         getNearbyParticles().forEach { otherParticle ->
178 |             if (otherParticle !== this && isCollidingWith(otherParticle)) {
179 |                 handleCollisionWith(otherParticle)
180 |                 correctPosition(otherParticle)
181 |             }
182 |         }
183 |     }
184 | 
185 |     private fun createParticles(x: Float, y: Float) {
186 |         repeat(5) {
187 |             val p = pool.getParticle(
188 |                 x = x,
189 |                 y = y,
190 |                 velocityX = (Random.nextFloat() - 0.5f) * 5,
191 |                 velocityY = (Random.nextFloat() - 0.5f) * 5,
192 |                 size = Random.nextFloat() * 10 + 2,
193 |             )
194 |             particleList.add(p)
195 |         }
196 |     }
197 | 
198 |     private fun addParticles() {
199 |         if (particleList.isNotEmpty()) return
200 |         repeat(100) {
201 |             val particle = pool.getParticle(
202 |                 x = Random.nextFloat() * width,
203 |                 y = Random.nextFloat() * height,
204 |                 velocityX = (Random.nextFloat() - 0.5f) * 8,
205 |                 velocityY = (Random.nextFloat() - 0.5f) * 8,
206 |                 size = Random.nextFloat() * 22 + 2
207 |             )
208 |             particleList.add(particle)
209 |         }
210 |     }
211 | 
212 |     private fun addParticleToGrid(particle: Particle) {
213 |         val gridX = (particle.x / gridSizePixel).toInt().coerceIn(0, grid.size - 1)
214 |         val gridY = (particle.y / gridSizePixel).toInt().coerceIn(0, grid[0].size - 1)
215 |         grid[gridX][gridY].add(particle)
216 |     }
217 | 
218 |     private fun Particle.getNearbyParticles(range: Int = 1): List<Particle> {
219 |         val nearbyParticles = mutableListOf<Particle>()
220 | 
221 |         val gridX = (x / gridSizePixel).toInt().coerceIn(0, grid.size - 1)
222 |         val gridY = (y / gridSizePixel).toInt().coerceIn(0, grid[0].size - 1)
223 | 
224 |         (-range..range).forEach { i ->
225 |             (-range..range).forEach { j ->
226 |                 val x = (gridX + i)
227 |                 val y = (gridY + j)
228 |                 if (x >= 0 && x < grid.size && y >= 0 && y < grid[0].size) {
229 |                     nearbyParticles.addAll(grid[x][y])
230 |                 }
231 |             }
232 |         }
233 | 
234 |         return nearbyParticles
235 |     }
236 | 
237 |     private fun Particle.isOutOfScreen(): Boolean {
238 |         return (x + size + THRESHOLD < 0 || y + size + THRESHOLD < 0 ||
239 |                 x - size > width + THRESHOLD || y - size > height + THRESHOLD)
240 |     }
241 | 
242 |     companion object {
243 |         private const val THRESHOLD = 5f
244 |     }
245 | }
246 | 
247 | fun getRandomColor(): Int {
248 |     val red = Random.nextInt(256)
249 |     val green = Random.nextInt(256)
250 |     val blue = Random.nextInt(256)
251 |     return Color.rgb(red, green, blue)
252 | }
253 | 
254 | fun rgb(r: Int = 128, g: Int = 128, b: Int = 128): Int {
255 |     return Color.rgb(r, g, b)
256 | }
257 | 


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