├── .gitignore ├── LICENSE ├── README.md ├── build.gradle ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── pixelsorter.gif ├── pixelsorter ├── build.gradle └── src │ └── main │ ├── AndroidManifest.xml │ ├── java │ └── com │ │ └── publicobject │ │ └── pixelsorter │ │ ├── PixelGrid.java │ │ ├── PixelGridView.java │ │ ├── PixelOp.java │ │ └── PixelSorterActivity.kt │ └── res │ ├── layout │ └── pixelsorter.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 │ ├── colors.xml │ ├── strings.xml │ └── styles.xml └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | # Built application files 2 | *.apk 3 | *.ap_ 4 | 5 | # Files for the ART/Dalvik VM 6 | *.dex 7 | 8 | # Java class files 9 | *.class 10 | 11 | # Generated files 12 | bin/ 13 | gen/ 14 | out/ 15 | 16 | # Gradle files 17 | .gradle/ 18 | build/ 19 | 20 | # Local configuration file (sdk path, etc) 21 | local.properties 22 | 23 | # Proguard folder generated by Eclipse 24 | proguard/ 25 | 26 | # Log Files 27 | *.log 28 | 29 | # Android Studio Navigation editor temp files 30 | .navigation/ 31 | 32 | # Android Studio captures folder 33 | captures/ 34 | 35 | # Intellij 36 | *.iml 37 | .idea/workspace.xml 38 | 39 | # Keystore files 40 | *.jks 41 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Concurrency 2 | 3 | Code and links from my 2017 talk on concurrency 4 | 5 | * [Video](https://www.youtube.com/watch?v=yS0Nc-L1Uuk) 6 | * [Slides](https://speakerdeck.com/swankjesse/coordinating-space-and-time-chicago-roboto-2017) 7 | 8 | ![](pixelsorter.gif) 9 | -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | subprojects { 2 | buildscript { 3 | repositories { 4 | jcenter() 5 | maven { 6 | url 'https://dl.bintray.com/kotlin/kotlin-eap-1.1' 7 | } 8 | } 9 | dependencies { 10 | classpath 'com.android.tools.build:gradle:2.2.3' 11 | classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.1-M03' 12 | } 13 | } 14 | 15 | repositories { 16 | mavenCentral() 17 | maven { 18 | url 'https://dl.bintray.com/kotlin/kotlin-eap-1.1' 19 | } 20 | } 21 | } 22 | 23 | ext { 24 | minSdkVersion = 16 25 | compileSdkVersion = 25 26 | buildToolsVersion = '25.0.0' 27 | javaVersion = JavaVersion.VERSION_1_7 28 | 29 | supportVersion = '25.0.0' 30 | 31 | libraries = [ 32 | kotlinStdLib: 'org.jetbrains.kotlin:kotlin-stdlib:1.1-M03', 33 | junit: 'junit:junit:4.12', 34 | supportRunner: 'com.android.support.test:runner:0.5', 35 | supportRules: 'com.android.support.test:rules:0.5', 36 | supportEspresso: 'com.android.support.test.espresso:espresso-core:2.2.2' 37 | ] 38 | } 39 | 40 | subprojects { project -> 41 | project.configurations.all { 42 | resolutionStrategy { 43 | eachDependency { details -> 44 | if (details.requested.group == 'com.android.support') { 45 | details.useVersion(rootProject.ext.supportVersion) 46 | } 47 | } 48 | } 49 | } 50 | } 51 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/swankjesse/concurrency/7efcd5ac1d5c5ded9808bbdbd5670db5258f447d/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Sat Oct 15 13:00:25 EDT 2016 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-2.14.1-all.zip 7 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Attempt to set APP_HOME 10 | # Resolve links: $0 may be a link 11 | PRG="$0" 12 | # Need this for relative symlinks. 13 | while [ -h "$PRG" ] ; do 14 | ls=`ls -ld "$PRG"` 15 | link=`expr "$ls" : '.*-> \(.*\)$'` 16 | if expr "$link" : '/.*' > /dev/null; then 17 | PRG="$link" 18 | else 19 | PRG=`dirname "$PRG"`"/$link" 20 | fi 21 | done 22 | SAVED="`pwd`" 23 | cd "`dirname \"$PRG\"`/" >/dev/null 24 | APP_HOME="`pwd -P`" 25 | cd "$SAVED" >/dev/null 26 | 27 | APP_NAME="Gradle" 28 | APP_BASE_NAME=`basename "$0"` 29 | 30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 31 | DEFAULT_JVM_OPTS="" 32 | 33 | # Use the maximum available, or set MAX_FD != -1 to use that value. 34 | MAX_FD="maximum" 35 | 36 | warn ( ) { 37 | echo "$*" 38 | } 39 | 40 | die ( ) { 41 | echo 42 | echo "$*" 43 | echo 44 | exit 1 45 | } 46 | 47 | # OS specific support (must be 'true' or 'false'). 48 | cygwin=false 49 | msys=false 50 | darwin=false 51 | nonstop=false 52 | case "`uname`" in 53 | CYGWIN* ) 54 | cygwin=true 55 | ;; 56 | Darwin* ) 57 | darwin=true 58 | ;; 59 | MINGW* ) 60 | msys=true 61 | ;; 62 | NONSTOP* ) 63 | nonstop=true 64 | ;; 65 | esac 66 | 67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 68 | 69 | # Determine the Java command to use to start the JVM. 70 | if [ -n "$JAVA_HOME" ] ; then 71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 72 | # IBM's JDK on AIX uses strange locations for the executables 73 | JAVACMD="$JAVA_HOME/jre/sh/java" 74 | else 75 | JAVACMD="$JAVA_HOME/bin/java" 76 | fi 77 | if [ ! -x "$JAVACMD" ] ; then 78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 79 | 80 | Please set the JAVA_HOME variable in your environment to match the 81 | location of your Java installation." 82 | fi 83 | else 84 | JAVACMD="java" 85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 86 | 87 | Please set the JAVA_HOME variable in your environment to match the 88 | location of your Java installation." 89 | fi 90 | 91 | # Increase the maximum file descriptors if we can. 92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 93 | MAX_FD_LIMIT=`ulimit -H -n` 94 | if [ $? -eq 0 ] ; then 95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 96 | MAX_FD="$MAX_FD_LIMIT" 97 | fi 98 | ulimit -n $MAX_FD 99 | if [ $? -ne 0 ] ; then 100 | warn "Could not set maximum file descriptor limit: $MAX_FD" 101 | fi 102 | else 103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 104 | fi 105 | fi 106 | 107 | # For Darwin, add options to specify how the application appears in the dock 108 | if $darwin; then 109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 110 | fi 111 | 112 | # For Cygwin, switch paths to Windows format before running java 113 | if $cygwin ; then 114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 116 | JAVACMD=`cygpath --unix "$JAVACMD"` 117 | 118 | # We build the pattern for arguments to be converted via cygpath 119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 120 | SEP="" 121 | for dir in $ROOTDIRSRAW ; do 122 | ROOTDIRS="$ROOTDIRS$SEP$dir" 123 | SEP="|" 124 | done 125 | OURCYGPATTERN="(^($ROOTDIRS))" 126 | # Add a user-defined pattern to the cygpath arguments 127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 129 | fi 130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 131 | i=0 132 | for arg in "$@" ; do 133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 135 | 136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 138 | else 139 | eval `echo args$i`="\"$arg\"" 140 | fi 141 | i=$((i+1)) 142 | done 143 | case $i in 144 | (0) set -- ;; 145 | (1) set -- "$args0" ;; 146 | (2) set -- "$args0" "$args1" ;; 147 | (3) set -- "$args0" "$args1" "$args2" ;; 148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 154 | esac 155 | fi 156 | 157 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules 158 | function splitJvmOpts() { 159 | JVM_OPTS=("$@") 160 | } 161 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS 162 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" 163 | 164 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" 165 | -------------------------------------------------------------------------------- /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 | set DIRNAME=%~dp0 12 | if "%DIRNAME%" == "" set DIRNAME=. 13 | set APP_BASE_NAME=%~n0 14 | set APP_HOME=%DIRNAME% 15 | 16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 17 | set DEFAULT_JVM_OPTS= 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 Windows 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 | -------------------------------------------------------------------------------- /pixelsorter.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/swankjesse/concurrency/7efcd5ac1d5c5ded9808bbdbd5670db5258f447d/pixelsorter.gif -------------------------------------------------------------------------------- /pixelsorter/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | apply plugin: 'kotlin-android' 3 | 4 | android { 5 | buildToolsVersion rootProject.ext.buildToolsVersion 6 | compileSdkVersion rootProject.ext.compileSdkVersion 7 | 8 | defaultConfig { 9 | applicationId 'com.publicobject.pixelsorter' 10 | 11 | minSdkVersion rootProject.ext.minSdkVersion 12 | targetSdkVersion rootProject.ext.compileSdkVersion 13 | 14 | versionCode 1 15 | versionName '1.0' 16 | 17 | testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner' 18 | } 19 | 20 | lintOptions { 21 | textReport true 22 | textOutput 'stdout' 23 | } 24 | } 25 | 26 | dependencies { 27 | compile libraries.kotlinStdLib 28 | 29 | androidTestCompile libraries.junit 30 | androidTestCompile libraries.supportRunner 31 | androidTestCompile libraries.supportRules 32 | androidTestCompile libraries.supportEspresso 33 | } 34 | 35 | // The default 'assemble' task only applies to normal variants. Add test variants as well. 36 | android.testVariants.all { variant -> 37 | tasks.getByName('assemble').dependsOn variant.assemble 38 | } 39 | 40 | tasks.withType(com.android.build.gradle.internal.tasks.AndroidTestTask) { task -> 41 | task.doFirst { 42 | logging.level = LogLevel.INFO 43 | } 44 | task.doLast { 45 | logging.level = LogLevel.LIFECYCLE 46 | } 47 | } 48 | -------------------------------------------------------------------------------- /pixelsorter/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 5 | 6 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | -------------------------------------------------------------------------------- /pixelsorter/src/main/java/com/publicobject/pixelsorter/PixelGrid.java: -------------------------------------------------------------------------------- 1 | package com.publicobject.pixelsorter; 2 | 3 | import java.util.Random; 4 | import java.util.concurrent.ExecutorService; 5 | import java.util.concurrent.Executors; 6 | import java.util.concurrent.ThreadFactory; 7 | 8 | public final class PixelGrid { 9 | private final ExecutorService executor1 = Executors.newFixedThreadPool(1, new ThreadFactory() { 10 | @Override public Thread newThread(Runnable runnable) { 11 | Thread result = new Thread(runnable); 12 | result.setPriority(Thread.MIN_PRIORITY); 13 | return result; 14 | } 15 | }); 16 | 17 | private final ExecutorService executor10 = Executors.newFixedThreadPool(10, new ThreadFactory() { 18 | @Override public Thread newThread(Runnable runnable) { 19 | Thread result = new Thread(runnable); 20 | result.setPriority(Thread.MIN_PRIORITY); 21 | return result; 22 | } 23 | }); 24 | 25 | public final int rowCount; 26 | public final int columnCount; 27 | public final int[][] pixels; 28 | 29 | public PixelGrid(int rowCount, int columnCount) { 30 | this.rowCount = rowCount; 31 | this.columnCount = columnCount; 32 | 33 | int p = 0; 34 | int half = (rowCount * columnCount) / 2; 35 | 36 | pixels = new int[rowCount][]; 37 | for (int r = 0; r < rowCount; r++) { 38 | pixels[r] = new int[columnCount]; 39 | for (int c = 0; c < columnCount; c++) { 40 | pixels[r][c] = p++ < half ? 1 : 0; 41 | } 42 | } 43 | } 44 | 45 | public void shuffle() { 46 | runOp(executor10, 1, PixelOp.SHUFFLE); 47 | } 48 | 49 | public void sort1() { 50 | sort(executor1); 51 | } 52 | 53 | public void sort10() { 54 | sort(executor10); 55 | } 56 | 57 | private void sort(ExecutorService executor) { 58 | runOp(executor, 2, PixelOp.SORT_FLIP_SLICE_4); 59 | runOp(executor, 2, PixelOp.SORT_FLIP_SLICE_5); 60 | runOp(executor, 2, PixelOp.SORT_SWAP_AND_FLIP_A_ROW); 61 | runOp(executor, 2, PixelOp.SORT_SWAP_MIN_MAX); 62 | } 63 | 64 | private void runOp(ExecutorService executorService, int count, final PixelOp op) { 65 | for (int i = 0; i < count; i++) { 66 | executorService.execute(new Runnable() { 67 | @Override public void run() { 68 | Random random = new Random(); 69 | while (op.run(PixelGrid.this, random)) { 70 | } 71 | } 72 | }); 73 | } 74 | } 75 | } 76 | -------------------------------------------------------------------------------- /pixelsorter/src/main/java/com/publicobject/pixelsorter/PixelGridView.java: -------------------------------------------------------------------------------- 1 | package com.publicobject.pixelsorter; 2 | 3 | import android.content.Context; 4 | import android.graphics.Canvas; 5 | import android.graphics.Color; 6 | import android.graphics.Paint; 7 | import android.util.AttributeSet; 8 | import android.view.View; 9 | 10 | public final class PixelGridView extends View { 11 | static final int pixelWidthDp = 8; 12 | static final int pixelStrideDb = 10; 13 | 14 | private final Paint[] paints; 15 | private PixelGrid grid; 16 | 17 | public PixelGridView(Context context, AttributeSet attrs) { 18 | super(context, attrs); 19 | 20 | paints = new Paint[3]; 21 | 22 | paints[0] = new Paint(); 23 | paints[0].setColor(getResources().getColor(R.color.blue)); 24 | paints[0].setTextAlign(Paint.Align.LEFT); 25 | paints[0].setTextSize(96); 26 | 27 | paints[1] = new Paint(); 28 | paints[1].setColor(getResources().getColor(R.color.red)); 29 | paints[1].setTextAlign(Paint.Align.RIGHT); 30 | paints[1].setTextSize(96); 31 | 32 | paints[2] = new Paint(); 33 | paints[2].setColor(Color.WHITE); 34 | paints[2].setTextAlign(Paint.Align.CENTER); 35 | paints[2].setTextSize(96); 36 | 37 | // This view draws a ton of small boxes and that's much more efficient in software. 38 | setLayerType(LAYER_TYPE_SOFTWARE, null); 39 | } 40 | 41 | public PixelGrid grid() { 42 | return grid; 43 | } 44 | 45 | @Override protected void onDraw(Canvas canvas) { 46 | int availableHeight = (getHeight() - (int) paints[0].getTextSize()) / pixelStrideDb; 47 | int availableWidth = getWidth() / pixelStrideDb; 48 | 49 | if (grid == null || grid.rowCount != availableHeight || grid.columnCount != availableWidth) { 50 | grid = new PixelGrid(availableHeight, availableWidth); 51 | } 52 | 53 | int blueCount = 0; 54 | int redCount = 0; 55 | 56 | for (int r = 0; r < grid.rowCount; r++) { 57 | for (int c = 0; c < grid.columnCount; c++) { 58 | int color = grid.pixels[r][c]; 59 | 60 | if (color == 0) { 61 | blueCount++; 62 | } else { 63 | redCount++; 64 | } 65 | 66 | int left = pixelStrideDb * c; 67 | int top = pixelStrideDb * r; 68 | canvas.drawRect(left, top, left + pixelWidthDp, top + pixelWidthDp, paints[color]); 69 | } 70 | } 71 | 72 | canvas.drawText(Integer.toString(blueCount), 0, getHeight(), paints[0]); 73 | canvas.drawText(Integer.toString(redCount), 74 | (grid.columnCount - 1) * pixelStrideDb + pixelWidthDp, getHeight(), paints[1]); 75 | int delta = Math.abs(redCount - blueCount); 76 | if (delta > 1) { 77 | canvas.drawText(Integer.toString(delta), getWidth() / 2, getHeight(), paints[2]); 78 | } 79 | 80 | invalidate(); // Repaint on every frame! 81 | } 82 | 83 | @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 84 | int width = MeasureSpec.getSize(widthMeasureSpec); 85 | int height = MeasureSpec.getSize(heightMeasureSpec); 86 | setMeasuredDimension(width, height); 87 | } 88 | } 89 | -------------------------------------------------------------------------------- /pixelsorter/src/main/java/com/publicobject/pixelsorter/PixelOp.java: -------------------------------------------------------------------------------- 1 | package com.publicobject.pixelsorter; 2 | 3 | import java.util.Random; 4 | 5 | enum PixelOp { 6 | SHUFFLE { 7 | @Override boolean run(PixelGrid grid, Random random) { 8 | int available = 0; 9 | int required = grid.rowCount * grid.columnCount; 10 | 11 | for (int r = 0; r < grid.rowCount; r++) { 12 | for (int c = 0; c < grid.columnCount; c++) { 13 | if (grid.pixels[r][c] == 1) available++; 14 | } 15 | } 16 | 17 | for (int r = 0; r < grid.rowCount; r++) { 18 | for (int c = 0; c < grid.columnCount; c++) { 19 | if (random.nextInt(required) < available) { 20 | available--; 21 | grid.pixels[r][c] = 1; 22 | } else { 23 | grid.pixels[r][c] = 0; 24 | } 25 | required--; 26 | } 27 | } 28 | 29 | return false; 30 | } 31 | }, 32 | 33 | SORT_SWAP_AND_FLIP_A_ROW { 34 | @Override public boolean run(PixelGrid grid, Random random) { 35 | int startRow = random.nextInt(grid.rowCount); 36 | 37 | for (int rn = grid.rowCount - 1; rn >= 0; rn--) { 38 | int r1 = (rn + startRow) % grid.rowCount; 39 | int r2 = r1 + 1; 40 | if (r2 == grid.rowCount) continue; 41 | 42 | int count1 = 0; 43 | int count2 = 0; 44 | for (int c = 0; c < grid.columnCount; c++) { 45 | if (grid.pixels[r1][c] == 1) count1++; 46 | if (grid.pixels[r2][c] == 1) count2++; 47 | } 48 | 49 | if (count1 > count2) { 50 | for (int c = 0; c < grid.columnCount; c++) { 51 | int tmp = grid.pixels[r2][grid.columnCount - 1 - c]; 52 | grid.pixels[r2][grid.columnCount - 1 - c] = grid.pixels[r1][c]; 53 | grid.pixels[r1][c] = tmp; 54 | } 55 | return true; 56 | } 57 | } 58 | 59 | return false; 60 | } 61 | }, 62 | 63 | SORT_SWAP_MIN_MAX { 64 | @Override public boolean run(PixelGrid grid, Random random) { 65 | int startRow = random.nextInt(grid.rowCount); 66 | for (int rn = 0; rn < grid.rowCount; rn++) { 67 | int r = (rn + startRow) % grid.rowCount; 68 | 69 | int min1 = Integer.MAX_VALUE; 70 | int max0 = Integer.MIN_VALUE; 71 | for (int c = 0; c < grid.columnCount; c++) { 72 | if (grid.pixels[r][c] == 1 && c < min1) min1 = c; 73 | if (grid.pixels[r][c] == 0 && c > max0) max0 = c; 74 | } 75 | if (min1 != Integer.MAX_VALUE && max0 != Integer.MIN_VALUE && min1 < max0) { 76 | grid.pixels[r][min1] = 0; 77 | grid.pixels[r][max0] = 1; 78 | return true; 79 | } 80 | } 81 | 82 | return false; 83 | } 84 | }, 85 | 86 | SORT_FLIP_SLICE_4 { 87 | @Override public boolean run(PixelGrid grid, Random random) { 88 | int startRow = random.nextInt(grid.rowCount); 89 | int startColumn = random.nextInt(grid.rowCount); 90 | 91 | for (int rn = 0; rn < grid.rowCount; rn++) { 92 | int r = (rn + startRow) % grid.rowCount; 93 | for (int cn = 0; cn < grid.columnCount; cn++) { 94 | int c = (cn + startColumn) % grid.columnCount; 95 | if (c + 3 < grid.columnCount) { 96 | int p0 = grid.pixels[r][c]; 97 | int p1 = grid.pixels[r][c + 1]; 98 | int p2 = grid.pixels[r][c + 2]; 99 | int p3 = grid.pixels[r][c + 3]; 100 | if (p0 > p3) { 101 | grid.pixels[r][c + 3] = p0; 102 | grid.pixels[r][c + 2] = p1; 103 | grid.pixels[r][c + 1] = p2; 104 | grid.pixels[r][c] = p3; 105 | return true; 106 | } 107 | } 108 | } 109 | } 110 | 111 | return false; 112 | } 113 | }, 114 | 115 | SORT_FLIP_SLICE_5 { 116 | @Override boolean run(PixelGrid grid, Random random) { 117 | int startRow = random.nextInt(grid.rowCount); 118 | int startColumn = random.nextInt(grid.rowCount); 119 | 120 | for (int rn = grid.rowCount - 1; rn >= 0; rn--) { 121 | int r = (rn + startRow) % grid.rowCount; 122 | for (int cn = 0; cn < grid.columnCount; cn++) { 123 | int c = (cn + startColumn) % grid.columnCount; 124 | if (c + 4 < grid.columnCount) { 125 | int p0 = grid.pixels[r][c]; 126 | int p1 = grid.pixels[r][c + 1]; 127 | int p2 = grid.pixels[r][c + 2]; 128 | int p3 = grid.pixels[r][c + 3]; 129 | int p4 = grid.pixels[r][c + 4]; 130 | if (p0 + p1 > p3 + p4) { 131 | grid.pixels[r][c + 4] = p0; 132 | grid.pixels[r][c + 3] = p1; 133 | grid.pixels[r][c + 2] = p2; 134 | grid.pixels[r][c + 1] = p3; 135 | grid.pixels[r][c] = p4; 136 | return true; 137 | } 138 | } 139 | } 140 | } 141 | return false; 142 | } 143 | }; 144 | 145 | /** Returns false if additional executions are not necessary. */ 146 | abstract boolean run(PixelGrid grid, Random random); 147 | } 148 | -------------------------------------------------------------------------------- /pixelsorter/src/main/java/com/publicobject/pixelsorter/PixelSorterActivity.kt: -------------------------------------------------------------------------------- 1 | package com.publicobject.pixelsorter 2 | 3 | import android.app.Activity 4 | import android.os.Bundle 5 | import android.widget.Button 6 | 7 | class PixelSorterActivity : Activity() { 8 | override fun onCreate(savedInstanceState: Bundle?) { 9 | super.onCreate(savedInstanceState) 10 | 11 | val layout = layoutInflater.inflate(R.layout.pixelsorter, null) 12 | setContentView(layout) 13 | 14 | val pixelGrid = layout.findViewById(R.id.pixelgrid) as PixelGridView 15 | 16 | (layout.findViewById(R.id.shuffle) as Button).setOnClickListener { 17 | pixelGrid.grid().shuffle() 18 | } 19 | 20 | (layout.findViewById(R.id.sort1) as Button).setOnClickListener { 21 | pixelGrid.grid().sort1() 22 | } 23 | 24 | (layout.findViewById(R.id.sort10) as Button).setOnClickListener { 25 | pixelGrid.grid().sort10() 26 | } 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /pixelsorter/src/main/res/layout/pixelsorter.xml: -------------------------------------------------------------------------------- 1 | 2 | 9 | 16 | 22 |