├── .gitignore ├── CHANGELOG.md ├── LICENSE ├── README.md ├── example ├── .gitignore ├── .metadata ├── README.md ├── android │ ├── .gitignore │ ├── app │ │ ├── build.gradle │ │ └── src │ │ │ └── main │ │ │ ├── AndroidManifest.xml │ │ │ ├── java │ │ │ └── eu │ │ │ │ └── epnw │ │ │ │ └── scalableimageexample │ │ │ │ └── MainActivity.java │ │ │ └── res │ │ │ ├── drawable │ │ │ └── launch_background.xml │ │ │ ├── mipmap-hdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-mdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xhdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xxhdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xxxhdpi │ │ │ └── ic_launcher.png │ │ │ └── values │ │ │ └── styles.xml │ ├── build.gradle │ ├── gradle.properties │ ├── gradle │ │ └── wrapper │ │ │ ├── gradle-wrapper.jar │ │ │ └── gradle-wrapper.properties │ ├── gradlew │ ├── gradlew.bat │ └── settings.gradle ├── assets │ └── example.png ├── demo.gif ├── example.iml ├── example_android.iml ├── ios │ ├── .gitignore │ ├── Flutter │ │ ├── AppFrameworkInfo.plist │ │ ├── Debug.xcconfig │ │ └── Release.xcconfig │ ├── Runner.xcodeproj │ │ ├── project.pbxproj │ │ ├── project.xcworkspace │ │ │ └── contents.xcworkspacedata │ │ └── xcshareddata │ │ │ └── xcschemes │ │ │ └── Runner.xcscheme │ ├── Runner.xcworkspace │ │ └── contents.xcworkspacedata │ └── Runner │ │ ├── AppDelegate.h │ │ ├── AppDelegate.m │ │ ├── Assets.xcassets │ │ ├── AppIcon.appiconset │ │ │ ├── Contents.json │ │ │ ├── Icon-App-1024x1024@1x.png │ │ │ ├── Icon-App-20x20@1x.png │ │ │ ├── Icon-App-20x20@2x.png │ │ │ ├── Icon-App-20x20@3x.png │ │ │ ├── Icon-App-29x29@1x.png │ │ │ ├── Icon-App-29x29@2x.png │ │ │ ├── Icon-App-29x29@3x.png │ │ │ ├── Icon-App-40x40@1x.png │ │ │ ├── Icon-App-40x40@2x.png │ │ │ ├── Icon-App-40x40@3x.png │ │ │ ├── Icon-App-60x60@2x.png │ │ │ ├── Icon-App-60x60@3x.png │ │ │ ├── Icon-App-76x76@1x.png │ │ │ ├── Icon-App-76x76@2x.png │ │ │ └── Icon-App-83.5x83.5@2x.png │ │ └── LaunchImage.imageset │ │ │ ├── Contents.json │ │ │ ├── LaunchImage.png │ │ │ ├── LaunchImage@2x.png │ │ │ ├── LaunchImage@3x.png │ │ │ └── README.md │ │ ├── Base.lproj │ │ ├── LaunchScreen.storyboard │ │ └── Main.storyboard │ │ ├── Info.plist │ │ └── main.m ├── lib │ └── main.dart ├── pubspec.lock └── pubspec.yaml ├── lib ├── scalable_image.dart └── src │ └── scalable_image.dart ├── pubspec.lock ├── pubspec.yaml └── scalable_image.iml /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | .atom/ 3 | .dart_tool/ 4 | .idea 5 | .packages 6 | .pub/ 7 | packages 8 | .gitignore -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | ## [DISCONTINUED] - 24.05.2021 2 | * While this widget was useful in the early days of Flutter, the Flutter team introduced an own way to zoom and pan, see [`InteractiveViewer`](https://api.flutter.dev/flutter/widgets/InteractiveViewer-class.html). 3 | ## [1.1.2] - 01.08.2019 4 | * fix: Fixed to flutter 1.7.8+hotfix.4 (issue #1) 5 | ## [1.1.1] - 25.04.2018 6 | * Added type (ImageProvider) to imageProvider in scalable_image.dart 7 | * Fixed library name 8 | ## [1.1.0] - 25.04.2018 9 | * Added an option which allows to wrap the image in an AspectRatio 10 | * Added an option to lock scaling 11 | ## [1.0.0] - 20.04.2018 12 | * Initial release 13 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Copyright 2018 Eric Prokop und Nils Wieler Hard- und Softwareentwicklung GbR 2 | 3 | Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 4 | 5 | 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 6 | 7 | 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 8 | 9 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # [DISCONTINUED] - 24.05.2021 2 | While this widget was useful in the early days of Flutter, the Flutter team introduced an own way to zoom and pan, see [`InteractiveViewer`](https://api.flutter.dev/flutter/widgets/InteractiveViewer-class.html). 3 | 4 | # scalable_image 5 | 6 | A widget that shows an image which can be scaled and dragged using gestures. 7 | This package was designed for quadratic images. It can happen that it don't behave as you expect for non quadratic images. 8 | A workaround is to wrap this image in an AspectRatio with an aspect ratio of the target image. 9 | This has the drawback that it does not fill the whole space while zooming since it will contain the aspect ratio. 10 | Feel free to fork on github. 11 | 12 | ## Getting Started 13 | 14 | You can also try using an other ImageProvider, like NetworkImage and FileImage. 15 | ``` 16 | new ScalableImage( 17 | imageProvider: new AssetImage('assets/example.png'), 18 | dragSpeed: 4.0, 19 | maxScale: 16.0 20 | ) 21 | ``` 22 | 23 | 24 | That's all you need. See below and [`example/`](https://github.com/epnw/scalable_image/tree/master/example) 25 | for an example. 26 | 27 | ![demo!](https://raw.githubusercontent.com/epnw/scalable_image/master/example/demo.gif) -------------------------------------------------------------------------------- /example/.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | .atom/ 3 | .dart_tool/ 4 | .idea 5 | .vscode/ 6 | .packages 7 | .pub/ 8 | build/ 9 | ios/.generated/ 10 | packages 11 | .flutter-plugins 12 | -------------------------------------------------------------------------------- /example/.metadata: -------------------------------------------------------------------------------- 1 | # This file tracks properties of this Flutter project. 2 | # Used by Flutter tool to assess capabilities and perform upgrades etc. 3 | # 4 | # This file should be version controlled and should not be manually edited. 5 | 6 | version: 7 | revision: b397406561f5e7a9c94e28f58d9e49fca0dd58b7 8 | channel: beta 9 | -------------------------------------------------------------------------------- /example/README.md: -------------------------------------------------------------------------------- 1 | # scalable_image_example 2 | 3 | An extremely simple demo of the scalable_image plugin. 4 | -------------------------------------------------------------------------------- /example/android/.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | *.class 3 | .gradle 4 | /local.properties 5 | /.idea/workspace.xml 6 | /.idea/libraries 7 | .DS_Store 8 | /build 9 | /captures 10 | GeneratedPluginRegistrant.java 11 | -------------------------------------------------------------------------------- /example/android/app/build.gradle: -------------------------------------------------------------------------------- 1 | def localProperties = new Properties() 2 | def localPropertiesFile = rootProject.file('local.properties') 3 | if (localPropertiesFile.exists()) { 4 | localPropertiesFile.withReader('UTF-8') { reader -> 5 | localProperties.load(reader) 6 | } 7 | } 8 | 9 | def flutterRoot = localProperties.getProperty('flutter.sdk') 10 | if (flutterRoot == null) { 11 | throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.") 12 | } 13 | 14 | apply plugin: 'com.android.application' 15 | apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle" 16 | 17 | android { 18 | compileSdkVersion 27 19 | 20 | lintOptions { 21 | disable 'InvalidPackage' 22 | } 23 | 24 | defaultConfig { 25 | // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). 26 | applicationId "eu.epnw.scalableimageexample" 27 | minSdkVersion 16 28 | targetSdkVersion 27 29 | versionCode 1 30 | versionName "1.0" 31 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 32 | } 33 | 34 | buildTypes { 35 | release { 36 | // TODO: Add your own signing config for the release build. 37 | // Signing with the debug keys for now, so `flutter run --release` works. 38 | signingConfig signingConfigs.debug 39 | } 40 | } 41 | } 42 | 43 | flutter { 44 | source '../..' 45 | } 46 | 47 | dependencies { 48 | testImplementation 'junit:junit:4.12' 49 | androidTestImplementation 'com.android.support.test:runner:1.0.1' 50 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1' 51 | } 52 | -------------------------------------------------------------------------------- /example/android/app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | 4 | 8 | 9 | 10 | 15 | 19 | 26 | 30 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | -------------------------------------------------------------------------------- /example/android/app/src/main/java/eu/epnw/scalableimageexample/MainActivity.java: -------------------------------------------------------------------------------- 1 | package eu.epnw.scalableimageexample; 2 | 3 | import android.os.Bundle; 4 | 5 | import io.flutter.app.FlutterActivity; 6 | import io.flutter.plugins.GeneratedPluginRegistrant; 7 | 8 | public class MainActivity extends FlutterActivity { 9 | @Override 10 | protected void onCreate(Bundle savedInstanceState) { 11 | super.onCreate(savedInstanceState); 12 | GeneratedPluginRegistrant.registerWith(this); 13 | } 14 | } 15 | -------------------------------------------------------------------------------- /example/android/app/src/main/res/drawable/launch_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 12 | 13 | -------------------------------------------------------------------------------- /example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EP-u-NW/scalable_image/e489c177e13c4d33819ed70e539af1d94a674a58/example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /example/android/app/src/main/res/mipmap-mdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EP-u-NW/scalable_image/e489c177e13c4d33819ed70e539af1d94a674a58/example/android/app/src/main/res/mipmap-mdpi/ic_launcher.png -------------------------------------------------------------------------------- /example/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EP-u-NW/scalable_image/e489c177e13c4d33819ed70e539af1d94a674a58/example/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png -------------------------------------------------------------------------------- /example/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EP-u-NW/scalable_image/e489c177e13c4d33819ed70e539af1d94a674a58/example/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /example/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EP-u-NW/scalable_image/e489c177e13c4d33819ed70e539af1d94a674a58/example/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /example/android/app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 8 | 9 | -------------------------------------------------------------------------------- /example/android/build.gradle: -------------------------------------------------------------------------------- 1 | buildscript { 2 | repositories { 3 | google() 4 | jcenter() 5 | } 6 | 7 | dependencies { 8 | classpath 'com.android.tools.build:gradle:3.0.1' 9 | } 10 | } 11 | 12 | allprojects { 13 | repositories { 14 | google() 15 | jcenter() 16 | } 17 | } 18 | 19 | rootProject.buildDir = '../build' 20 | subprojects { 21 | project.buildDir = "${rootProject.buildDir}/${project.name}" 22 | } 23 | subprojects { 24 | project.evaluationDependsOn(':app') 25 | } 26 | 27 | task clean(type: Delete) { 28 | delete rootProject.buildDir 29 | } 30 | -------------------------------------------------------------------------------- /example/android/gradle.properties: -------------------------------------------------------------------------------- 1 | org.gradle.jvmargs=-Xmx1536M 2 | -------------------------------------------------------------------------------- /example/android/gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EP-u-NW/scalable_image/e489c177e13c4d33819ed70e539af1d94a674a58/example/android/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /example/android/gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Fri Jun 23 08:50:38 CEST 2017 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip 7 | -------------------------------------------------------------------------------- /example/android/gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 10 | DEFAULT_JVM_OPTS="" 11 | 12 | APP_NAME="Gradle" 13 | APP_BASE_NAME=`basename "$0"` 14 | 15 | # Use the maximum available, or set MAX_FD != -1 to use that value. 16 | MAX_FD="maximum" 17 | 18 | warn ( ) { 19 | echo "$*" 20 | } 21 | 22 | die ( ) { 23 | echo 24 | echo "$*" 25 | echo 26 | exit 1 27 | } 28 | 29 | # OS specific support (must be 'true' or 'false'). 30 | cygwin=false 31 | msys=false 32 | darwin=false 33 | case "`uname`" in 34 | CYGWIN* ) 35 | cygwin=true 36 | ;; 37 | Darwin* ) 38 | darwin=true 39 | ;; 40 | MINGW* ) 41 | msys=true 42 | ;; 43 | esac 44 | 45 | # Attempt to set APP_HOME 46 | # Resolve links: $0 may be a link 47 | PRG="$0" 48 | # Need this for relative symlinks. 49 | while [ -h "$PRG" ] ; do 50 | ls=`ls -ld "$PRG"` 51 | link=`expr "$ls" : '.*-> \(.*\)$'` 52 | if expr "$link" : '/.*' > /dev/null; then 53 | PRG="$link" 54 | else 55 | PRG=`dirname "$PRG"`"/$link" 56 | fi 57 | done 58 | SAVED="`pwd`" 59 | cd "`dirname \"$PRG\"`/" >/dev/null 60 | APP_HOME="`pwd -P`" 61 | cd "$SAVED" >/dev/null 62 | 63 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 64 | 65 | # Determine the Java command to use to start the JVM. 66 | if [ -n "$JAVA_HOME" ] ; then 67 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 68 | # IBM's JDK on AIX uses strange locations for the executables 69 | JAVACMD="$JAVA_HOME/jre/sh/java" 70 | else 71 | JAVACMD="$JAVA_HOME/bin/java" 72 | fi 73 | if [ ! -x "$JAVACMD" ] ; then 74 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 75 | 76 | Please set the JAVA_HOME variable in your environment to match the 77 | location of your Java installation." 78 | fi 79 | else 80 | JAVACMD="java" 81 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 82 | 83 | Please set the JAVA_HOME variable in your environment to match the 84 | location of your Java installation." 85 | fi 86 | 87 | # Increase the maximum file descriptors if we can. 88 | if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then 89 | MAX_FD_LIMIT=`ulimit -H -n` 90 | if [ $? -eq 0 ] ; then 91 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 92 | MAX_FD="$MAX_FD_LIMIT" 93 | fi 94 | ulimit -n $MAX_FD 95 | if [ $? -ne 0 ] ; then 96 | warn "Could not set maximum file descriptor limit: $MAX_FD" 97 | fi 98 | else 99 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 100 | fi 101 | fi 102 | 103 | # For Darwin, add options to specify how the application appears in the dock 104 | if $darwin; then 105 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 106 | fi 107 | 108 | # For Cygwin, switch paths to Windows format before running java 109 | if $cygwin ; then 110 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 111 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 112 | JAVACMD=`cygpath --unix "$JAVACMD"` 113 | 114 | # We build the pattern for arguments to be converted via cygpath 115 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 116 | SEP="" 117 | for dir in $ROOTDIRSRAW ; do 118 | ROOTDIRS="$ROOTDIRS$SEP$dir" 119 | SEP="|" 120 | done 121 | OURCYGPATTERN="(^($ROOTDIRS))" 122 | # Add a user-defined pattern to the cygpath arguments 123 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 124 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 125 | fi 126 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 127 | i=0 128 | for arg in "$@" ; do 129 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 130 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 131 | 132 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 133 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 134 | else 135 | eval `echo args$i`="\"$arg\"" 136 | fi 137 | i=$((i+1)) 138 | done 139 | case $i in 140 | (0) set -- ;; 141 | (1) set -- "$args0" ;; 142 | (2) set -- "$args0" "$args1" ;; 143 | (3) set -- "$args0" "$args1" "$args2" ;; 144 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 145 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 146 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 147 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 148 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 149 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 150 | esac 151 | fi 152 | 153 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules 154 | function splitJvmOpts() { 155 | JVM_OPTS=("$@") 156 | } 157 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS 158 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" 159 | 160 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" 161 | -------------------------------------------------------------------------------- /example/android/gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 12 | set DEFAULT_JVM_OPTS= 13 | 14 | set DIRNAME=%~dp0 15 | if "%DIRNAME%" == "" set DIRNAME=. 16 | set APP_BASE_NAME=%~n0 17 | set APP_HOME=%DIRNAME% 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windowz variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | if "%@eval[2+2]" == "4" goto 4NT_args 53 | 54 | :win9xME_args 55 | @rem Slurp the command line arguments. 56 | set CMD_LINE_ARGS= 57 | set _SKIP=2 58 | 59 | :win9xME_args_slurp 60 | if "x%~1" == "x" goto execute 61 | 62 | set CMD_LINE_ARGS=%* 63 | goto execute 64 | 65 | :4NT_args 66 | @rem Get arguments from the 4NT Shell from JP Software 67 | set CMD_LINE_ARGS=%$ 68 | 69 | :execute 70 | @rem Setup the command line 71 | 72 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 73 | 74 | @rem Execute Gradle 75 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 76 | 77 | :end 78 | @rem End local scope for the variables with windows NT shell 79 | if "%ERRORLEVEL%"=="0" goto mainEnd 80 | 81 | :fail 82 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 83 | rem the _cmd.exe /c_ return code! 84 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 85 | exit /b 1 86 | 87 | :mainEnd 88 | if "%OS%"=="Windows_NT" endlocal 89 | 90 | :omega 91 | -------------------------------------------------------------------------------- /example/android/settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | 3 | def flutterProjectRoot = rootProject.projectDir.parentFile.toPath() 4 | 5 | def plugins = new Properties() 6 | def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins') 7 | if (pluginsFile.exists()) { 8 | pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) } 9 | } 10 | 11 | plugins.each { name, path -> 12 | def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile() 13 | include ":$name" 14 | project(":$name").projectDir = pluginDirectory 15 | } 16 | -------------------------------------------------------------------------------- /example/assets/example.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EP-u-NW/scalable_image/e489c177e13c4d33819ed70e539af1d94a674a58/example/assets/example.png -------------------------------------------------------------------------------- /example/demo.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EP-u-NW/scalable_image/e489c177e13c4d33819ed70e539af1d94a674a58/example/demo.gif -------------------------------------------------------------------------------- /example/example.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | -------------------------------------------------------------------------------- /example/example_android.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | -------------------------------------------------------------------------------- /example/ios/.gitignore: -------------------------------------------------------------------------------- 1 | .idea/ 2 | .vagrant/ 3 | .sconsign.dblite 4 | .svn/ 5 | 6 | .DS_Store 7 | *.swp 8 | profile 9 | 10 | DerivedData/ 11 | build/ 12 | GeneratedPluginRegistrant.h 13 | GeneratedPluginRegistrant.m 14 | 15 | *.pbxuser 16 | *.mode1v3 17 | *.mode2v3 18 | *.perspectivev3 19 | 20 | !default.pbxuser 21 | !default.mode1v3 22 | !default.mode2v3 23 | !default.perspectivev3 24 | 25 | xcuserdata 26 | 27 | *.moved-aside 28 | 29 | *.pyc 30 | *sync/ 31 | Icon? 32 | .tags* 33 | 34 | /Flutter/app.flx 35 | /Flutter/app.zip 36 | /Flutter/flutter_assets/ 37 | /Flutter/App.framework 38 | /Flutter/Flutter.framework 39 | /Flutter/Generated.xcconfig 40 | /ServiceDefinitions.json 41 | 42 | Pods/ 43 | -------------------------------------------------------------------------------- /example/ios/Flutter/AppFrameworkInfo.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | App 9 | CFBundleIdentifier 10 | io.flutter.flutter.app 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | App 15 | CFBundlePackageType 16 | FMWK 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1.0 23 | UIRequiredDeviceCapabilities 24 | 25 | arm64 26 | 27 | MinimumOSVersion 28 | 8.0 29 | 30 | 31 | -------------------------------------------------------------------------------- /example/ios/Flutter/Debug.xcconfig: -------------------------------------------------------------------------------- 1 | #include "Generated.xcconfig" 2 | -------------------------------------------------------------------------------- /example/ios/Flutter/Release.xcconfig: -------------------------------------------------------------------------------- 1 | #include "Generated.xcconfig" 2 | -------------------------------------------------------------------------------- /example/ios/Runner.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 4 | classes = { 5 | }; 6 | objectVersion = 46; 7 | objects = { 8 | 9 | /* Begin PBXBuildFile section */ 10 | 1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; }; 11 | 2D5378261FAA1A9400D5DBA9 /* flutter_assets in Resources */ = {isa = PBXBuildFile; fileRef = 2D5378251FAA1A9400D5DBA9 /* flutter_assets */; }; 12 | 3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = 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| 94 | -------------------------------------------------------------------------------- /example/ios/Runner.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /example/ios/Runner/AppDelegate.h: -------------------------------------------------------------------------------- 1 | #import 2 | #import 3 | 4 | @interface AppDelegate : FlutterAppDelegate 5 | 6 | @end 7 | -------------------------------------------------------------------------------- /example/ios/Runner/AppDelegate.m: -------------------------------------------------------------------------------- 1 | #include "AppDelegate.h" 2 | #include "GeneratedPluginRegistrant.h" 3 | 4 | @implementation AppDelegate 5 | 6 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 7 | [GeneratedPluginRegistrant registerWithRegistry:self]; 8 | // Override point for customization after application launch. 9 | return [super application:application didFinishLaunchingWithOptions:launchOptions]; 10 | } 11 | 12 | @end 13 | -------------------------------------------------------------------------------- /example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "size" : "20x20", 5 | "idiom" : "iphone", 6 | "filename" : "Icon-App-20x20@2x.png", 7 | "scale" : "2x" 8 | }, 9 | { 10 | "size" : "20x20", 11 | "idiom" : "iphone", 12 | "filename" : "Icon-App-20x20@3x.png", 13 | "scale" : "3x" 14 | }, 15 | { 16 | "size" : "29x29", 17 | "idiom" : "iphone", 18 | "filename" : "Icon-App-29x29@1x.png", 19 | "scale" : "1x" 20 | }, 21 | { 22 | "size" : "29x29", 23 | "idiom" : "iphone", 24 | "filename" : "Icon-App-29x29@2x.png", 25 | "scale" : "2x" 26 | }, 27 | { 28 | "size" : "29x29", 29 | "idiom" : "iphone", 30 | "filename" : "Icon-App-29x29@3x.png", 31 | "scale" : "3x" 32 | }, 33 | { 34 | "size" : "40x40", 35 | "idiom" : "iphone", 36 | "filename" : "Icon-App-40x40@2x.png", 37 | "scale" : "2x" 38 | }, 39 | { 40 | "size" : "40x40", 41 | "idiom" : "iphone", 42 | "filename" : "Icon-App-40x40@3x.png", 43 | "scale" : "3x" 44 | }, 45 | { 46 | "size" : "60x60", 47 | "idiom" : "iphone", 48 | "filename" : "Icon-App-60x60@2x.png", 49 | "scale" : "2x" 50 | }, 51 | { 52 | "size" : "60x60", 53 | "idiom" : "iphone", 54 | "filename" : "Icon-App-60x60@3x.png", 55 | "scale" : "3x" 56 | }, 57 | { 58 | "size" : "20x20", 59 | "idiom" : "ipad", 60 | "filename" : "Icon-App-20x20@1x.png", 61 | "scale" : "1x" 62 | }, 63 | { 64 | "size" : "20x20", 65 | "idiom" : "ipad", 66 | "filename" : "Icon-App-20x20@2x.png", 67 | "scale" : "2x" 68 | }, 69 | { 70 | "size" : "29x29", 71 | "idiom" : "ipad", 72 | "filename" : "Icon-App-29x29@1x.png", 73 | "scale" : "1x" 74 | }, 75 | { 76 | "size" : "29x29", 77 | "idiom" : "ipad", 78 | "filename" : "Icon-App-29x29@2x.png", 79 | "scale" : "2x" 80 | }, 81 | { 82 | "size" : "40x40", 83 | "idiom" : "ipad", 84 | "filename" : "Icon-App-40x40@1x.png", 85 | "scale" : "1x" 86 | }, 87 | { 88 | "size" : "40x40", 89 | "idiom" : "ipad", 90 | "filename" : "Icon-App-40x40@2x.png", 91 | "scale" : "2x" 92 | }, 93 | { 94 | "size" : "76x76", 95 | "idiom" : "ipad", 96 | "filename" : "Icon-App-76x76@1x.png", 97 | "scale" : "1x" 98 | }, 99 | { 100 | "size" : "76x76", 101 | "idiom" : "ipad", 102 | "filename" : "Icon-App-76x76@2x.png", 103 | "scale" : "2x" 104 | }, 105 | { 106 | "size" : "83.5x83.5", 107 | "idiom" : "ipad", 108 | "filename" : "Icon-App-83.5x83.5@2x.png", 109 | "scale" : "2x" 110 | }, 111 | { 112 | "size" : "1024x1024", 113 | "idiom" : "ios-marketing", 114 | "filename" : "Icon-App-1024x1024@1x.png", 115 | "scale" : "1x" 116 | } 117 | ], 118 | "info" : { 119 | "version" : 1, 120 | "author" : "xcode" 121 | } 122 | } 123 | 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https://raw.githubusercontent.com/EP-u-NW/scalable_image/e489c177e13c4d33819ed70e539af1d94a674a58/example/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage@3x.png -------------------------------------------------------------------------------- /example/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md: -------------------------------------------------------------------------------- 1 | # Launch Screen Assets 2 | 3 | You can customize the launch screen with your own desired assets by replacing the image files in this directory. 4 | 5 | You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images. -------------------------------------------------------------------------------- /example/ios/Runner/Base.lproj/LaunchScreen.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | -------------------------------------------------------------------------------- /example/ios/Runner/Base.lproj/Main.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | -------------------------------------------------------------------------------- /example/ios/Runner/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | $(PRODUCT_BUNDLE_IDENTIFIER) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | scalable_image_example 15 | CFBundlePackageType 16 | APPL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1 23 | LSRequiresIPhoneOS 24 | 25 | UILaunchStoryboardName 26 | LaunchScreen 27 | UIMainStoryboardFile 28 | Main 29 | UIRequiredDeviceCapabilities 30 | 31 | arm64 32 | 33 | UISupportedInterfaceOrientations 34 | 35 | UIInterfaceOrientationPortrait 36 | UIInterfaceOrientationLandscapeLeft 37 | UIInterfaceOrientationLandscapeRight 38 | 39 | UISupportedInterfaceOrientations~ipad 40 | 41 | UIInterfaceOrientationPortrait 42 | UIInterfaceOrientationPortraitUpsideDown 43 | UIInterfaceOrientationLandscapeLeft 44 | UIInterfaceOrientationLandscapeRight 45 | 46 | UIViewControllerBasedStatusBarAppearance 47 | 48 | 49 | 50 | -------------------------------------------------------------------------------- /example/ios/Runner/main.m: -------------------------------------------------------------------------------- 1 | #import 2 | #import 3 | #import "AppDelegate.h" 4 | 5 | int main(int argc, char * argv[]) { 6 | @autoreleasepool { 7 | return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 8 | } 9 | } 10 | -------------------------------------------------------------------------------- /example/lib/main.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/material.dart'; 2 | import 'package:scalable_image/scalable_image.dart'; 3 | 4 | void main() { 5 | runApp(new MaterialApp( 6 | theme: new ThemeData( 7 | brightness: Brightness.dark, 8 | primarySwatch: Colors.green 9 | ), 10 | title: 'Scalable Image Example', 11 | home: new MainPage() 12 | )); 13 | } 14 | class MainPage extends StatelessWidget { 15 | @override 16 | Widget build(BuildContext context) { 17 | return new Scaffold( 18 | appBar: new AppBar( 19 | title: const Text('Scalable Image Example'), 20 | centerTitle: true, 21 | ), 22 | body: new Container( 23 | alignment: Alignment.center, 24 | child: new ScalableImage( 25 | imageProvider: new AssetImage('assets/example.png'), 26 | dragSpeed: 4.0, 27 | maxScale: 16.0, 28 | wrapInAspect: false, 29 | enableScaling: true, 30 | ), 31 | ), 32 | ); 33 | } 34 | } 35 | -------------------------------------------------------------------------------- /example/pubspec.lock: -------------------------------------------------------------------------------- 1 | # Generated by pub 2 | # See https://www.dartlang.org/tools/pub/glossary#lockfile 3 | packages: 4 | collection: 5 | dependency: transitive 6 | description: 7 | name: collection 8 | url: "https://pub.dartlang.org" 9 | source: hosted 10 | version: "1.14.6" 11 | flutter: 12 | dependency: "direct main" 13 | description: flutter 14 | source: sdk 15 | version: "0.0.0" 16 | meta: 17 | dependency: transitive 18 | description: 19 | name: meta 20 | url: "https://pub.dartlang.org" 21 | source: hosted 22 | version: "1.1.2" 23 | scalable_image: 24 | dependency: "direct main" 25 | description: 26 | path: ".." 27 | relative: true 28 | source: path 29 | version: "1.1.1" 30 | sky_engine: 31 | dependency: transitive 32 | description: flutter 33 | source: sdk 34 | version: "0.0.99" 35 | typed_data: 36 | dependency: transitive 37 | description: 38 | name: typed_data 39 | url: "https://pub.dartlang.org" 40 | source: hosted 41 | version: "1.1.5" 42 | vector_math: 43 | dependency: transitive 44 | description: 45 | name: vector_math 46 | url: "https://pub.dartlang.org" 47 | source: hosted 48 | version: "2.0.5" 49 | sdks: 50 | dart: ">=2.0.0-dev.28.0 <=2.0.0-edge.3c4dccbd46f152be9e1b6ca95c57357e8e48057c" 51 | flutter: ">=0.1.4 <2.0.0" 52 | -------------------------------------------------------------------------------- /example/pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: scalable_image_example 2 | description: An extremely simple demo of the scalable_image plugin. 3 | 4 | dependencies: 5 | flutter: 6 | sdk: flutter 7 | scalable_image: 8 | path: ../ 9 | 10 | flutter: 11 | uses-material-design: true 12 | assets: 13 | - assets/example.png -------------------------------------------------------------------------------- /lib/scalable_image.dart: -------------------------------------------------------------------------------- 1 | library scalable_image; 2 | export 'src/scalable_image.dart' show ScalableImage; -------------------------------------------------------------------------------- /lib/src/scalable_image.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/material.dart' hide Image; 2 | import 'package:flutter/rendering.dart'; 3 | import 'package:flutter/foundation.dart'; 4 | import 'dart:ui'; 5 | import 'dart:math'; 6 | 7 | class ScalableImage extends StatefulWidget { 8 | 9 | const ScalableImage({Key key,@required ImageProvider imageProvider,double maxScale,double dragSpeed,Size size,bool wrapInAspect,bool enableScaling}): 10 | assert(imageProvider != null), 11 | this._imageProvider=imageProvider, 12 | assert((maxScale??16.0)>1.0), 13 | this._maxScale=maxScale??16.0, 14 | this._dragSpeed=dragSpeed??8.0, 15 | this._size=size??const Size.square(double.infinity), 16 | this._wrapInAspect=wrapInAspect??false, 17 | this._enableScaling=enableScaling??true, 18 | super(key: key); 19 | 20 | final ImageProvider _imageProvider; 21 | final bool _wrapInAspect,_enableScaling; 22 | final double _maxScale,_dragSpeed; 23 | final Size _size; 24 | 25 | @override 26 | _ScalableImageState createState() => new _ScalableImageState(); 27 | } 28 | 29 | class _ScalableImageState extends State { 30 | 31 | ImageStream _imageStream; 32 | ImageInfo _imageInfo; 33 | double _scale=1.0; 34 | double _lastEndScale=1.0; 35 | Offset _offset=Offset.zero; 36 | Offset _lastFocalPoint; 37 | Size _imageSize; 38 | Offset _targetPointPixelSpace; 39 | Offset _targetPointDrawSpace; 40 | 41 | 42 | @override 43 | void didChangeDependencies() { 44 | super.didChangeDependencies(); 45 | _getImage(); 46 | } 47 | 48 | @override 49 | void didUpdateWidget(ScalableImage oldWidget) { 50 | super.didUpdateWidget(oldWidget); 51 | if (widget._imageProvider != oldWidget._imageProvider) 52 | _getImage(); 53 | } 54 | 55 | void _getImage() { 56 | final ImageStream oldImageStream = _imageStream; 57 | _imageStream = widget._imageProvider.resolve(createLocalImageConfiguration(context)); 58 | if (_imageStream.key != oldImageStream?.key) { 59 | oldImageStream?.removeListener(ImageStreamListener(_updateImage)); 60 | _imageStream.addListener(ImageStreamListener(_updateImage)); 61 | } 62 | } 63 | 64 | void _updateImage(ImageInfo imageInfo, bool synchronousCall) { 65 | setState(() { 66 | _imageInfo = imageInfo; 67 | _imageSize=_imageInfo==null?null:new Size(_imageInfo.image.width.toDouble(),_imageInfo.image.height.toDouble()); 68 | }); 69 | } 70 | 71 | @override 72 | void dispose() { 73 | _imageStream.removeListener(ImageStreamListener(_updateImage)); 74 | super.dispose(); 75 | } 76 | 77 | @override 78 | Widget build(BuildContext context) { 79 | if(_imageInfo==null){ 80 | return new Container( 81 | alignment: Alignment.center, 82 | child: new FractionallySizedBox( 83 | widthFactor: 0.1, 84 | child: new AspectRatio( 85 | aspectRatio: 1.0, 86 | child: new CircularProgressIndicator() 87 | ) 88 | ) 89 | ); 90 | } else { 91 | Widget painter=new CustomPaint( 92 | size: widget._size, 93 | painter: new _ScalableImagePainter(_imageInfo.image,_offset,_scale), 94 | willChange: true, 95 | ); 96 | if(widget._wrapInAspect){ 97 | painter=new AspectRatio( 98 | aspectRatio: _imageSize.width/_imageSize.height, 99 | child:painter); 100 | } 101 | if(widget._enableScaling) { 102 | return new GestureDetector( 103 | child: painter, 104 | onScaleUpdate: _handleScaleUpdate, 105 | onScaleEnd: _handleScaleEnd, 106 | onScaleStart: _handleScaleStart, 107 | ); 108 | } else { 109 | return painter; 110 | } 111 | } 112 | } 113 | 114 | void _handleScaleStart(ScaleStartDetails start){ 115 | _lastFocalPoint=start.focalPoint; 116 | _targetPointDrawSpace=(context.findRenderObject() as RenderBox).globalToLocal(start.focalPoint); 117 | _targetPointPixelSpace=drawSpaceToPixelSpace(_targetPointDrawSpace,context.size,_offset,_imageSize,_scale); 118 | } 119 | 120 | void _handleScaleEnd(ScaleEndDetails end){ 121 | _lastEndScale=_scale; 122 | } 123 | 124 | void _handleScaleUpdate(ScaleUpdateDetails event) { 125 | 126 | //init old values 127 | double newScale=_scale; 128 | Offset newOffset=_offset; 129 | 130 | if(event.scale==1.0){ //This is a movement 131 | //Calculate movement since last call 132 | Offset delta=(_lastFocalPoint-event.focalPoint)*widget._dragSpeed/_scale; 133 | //Store the new information 134 | _lastFocalPoint=event.focalPoint; 135 | //And move it 136 | newOffset+=delta; 137 | } else { 138 | //Round the scale to three points after comma to prevent shaking 139 | double roundedScale=_roundAfter(event.scale, 3); 140 | //Calculate new scale but do not scale to far out or in 141 | newScale= min(widget._maxScale, max(1.0, roundedScale*_lastEndScale)); 142 | //Move the offset so that the target point stays at the same position after scaling 143 | newOffset=_elementwiseDivision(_targetPointDrawSpace, -_linearTransformationFactor(context.size, _imageSize, newScale))+_targetPointPixelSpace; 144 | } 145 | //Don't move to far left 146 | newOffset=_elementwiseMax(newOffset,Offset.zero); 147 | //Nor to far right 148 | double borderScale=1.0-1.0/newScale; 149 | newOffset=_elementwiseMin(newOffset,_asOffset(_imageSize*borderScale)); 150 | if (newScale != _scale || newOffset != _offset) { 151 | setState(() { 152 | _scale = newScale; 153 | _offset=newOffset; 154 | }); 155 | } 156 | } 157 | } 158 | 159 | class _ScalableImagePainter extends CustomPainter{ 160 | 161 | final Image _image; 162 | final Paint _paint; 163 | final Rect _rect; 164 | 165 | _ScalableImagePainter(this._image,Offset offset,double scale) : 166 | this._rect=new Rect.fromLTWH( 167 | offset.dx, 168 | offset.dy, 169 | _image.width.toDouble()/scale, 170 | _image.height.toDouble()/scale 171 | ), 172 | this._paint = new Paint(); 173 | 174 | @override 175 | void paint(Canvas canvas, Size size) { 176 | canvas.drawImageRect( 177 | _image, 178 | _rect, 179 | new Rect.fromLTWH(0.0, 0.0, size.width, size.height), 180 | _paint); 181 | } 182 | 183 | @override 184 | bool shouldRepaint(_ScalableImagePainter oldDelegate) { 185 | return _rect != oldDelegate._rect || _image!=oldDelegate._image; 186 | } 187 | 188 | } 189 | 190 | Offset _linearTransformationFactor(Size drawSpaceSize, Size imageSize,double scale){ 191 | return new Offset(drawSpaceSize.width/(imageSize.width/scale), drawSpaceSize.height/(imageSize.height/scale)); 192 | } 193 | 194 | 195 | Offset pixelSpaceToDrawSpace(Offset pixelSpace,Size drawSpaceSize,Offset offset, Size imageSize,double scale){ 196 | return _elementwiseMultiplication(pixelSpace-offset,_linearTransformationFactor(drawSpaceSize, imageSize, scale)); 197 | } 198 | 199 | Offset drawSpaceToPixelSpace(Offset drawSpace,Size drawSpaceSize,Offset offset, Size imageSize,double scale){ 200 | return _elementwiseDivision(drawSpace, _linearTransformationFactor(drawSpaceSize, imageSize, scale))+offset; 201 | } 202 | 203 | double _roundAfter(double number,int position){ 204 | double shift=pow(10,position).toDouble(); 205 | return (number*shift).roundToDouble()/shift; 206 | } 207 | 208 | Offset _elementwiseDivision(Offset dividend,Offset divisor){ 209 | return dividend.scale(1.0/divisor.dx, 1.0/divisor.dy); 210 | } 211 | 212 | Offset _elementwiseMultiplication(Offset a,Offset b){ 213 | return a.scale(b.dx, b.dy); 214 | } 215 | 216 | Offset _elementwiseMin(Offset a,Offset b){ 217 | return new Offset(min(a.dx,b.dx), min(a.dy,b.dy)); 218 | } 219 | 220 | Offset _elementwiseMax(Offset a, Offset b){ 221 | return new Offset(max(a.dx,b.dx), max(a.dy,b.dy)); 222 | } 223 | 224 | Offset _asOffset(Size s){ 225 | return new Offset(s.width,s.height); 226 | } 227 | 228 | -------------------------------------------------------------------------------- /pubspec.lock: -------------------------------------------------------------------------------- 1 | # Generated by pub 2 | # See https://www.dartlang.org/tools/pub/glossary#lockfile 3 | packages: 4 | collection: 5 | dependency: transitive 6 | description: 7 | name: collection 8 | url: "https://pub.dartlang.org" 9 | source: hosted 10 | version: "1.14.6" 11 | flutter: 12 | dependency: "direct main" 13 | description: flutter 14 | source: sdk 15 | version: "0.0.0" 16 | meta: 17 | dependency: transitive 18 | description: 19 | name: meta 20 | url: "https://pub.dartlang.org" 21 | source: hosted 22 | version: "1.1.2" 23 | sky_engine: 24 | dependency: transitive 25 | description: flutter 26 | source: sdk 27 | version: "0.0.99" 28 | typed_data: 29 | dependency: transitive 30 | description: 31 | name: typed_data 32 | url: "https://pub.dartlang.org" 33 | source: hosted 34 | version: "1.1.5" 35 | vector_math: 36 | dependency: transitive 37 | description: 38 | name: vector_math 39 | url: "https://pub.dartlang.org" 40 | source: hosted 41 | version: "2.0.5" 42 | sdks: 43 | dart: ">=2.0.0-dev.28.0 <=2.0.0-edge.3c4dccbd46f152be9e1b6ca95c57357e8e48057c" 44 | flutter: ">=0.1.4 <2.0.0" 45 | -------------------------------------------------------------------------------- /pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: scalable_image 2 | description: A widget that shows an image which can be scaled and dragged using gestures 3 | version: 1.1.3 4 | author: EPNW 5 | homepage: https://github.com/epnw/scalable_image 6 | 7 | dependencies: 8 | flutter: 9 | sdk: flutter 10 | 11 | environment: 12 | sdk: ">=2.0.0 <3.0.0" 13 | flutter: ">=0.1.4 <2.0.0" 14 | 15 | -------------------------------------------------------------------------------- /scalable_image.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | --------------------------------------------------------------------------------