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Initial commit of JBox2D test. Looking good on emulator and on a physical device (Motorola Droid) but some problems noticed seem to be elsewhere in the library.
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‎.classpath

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<classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="src" path="gen"/>
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<classpathentry exported="true" kind="lib" path="libs/JBox2D-2.0.1-b250-Library.jar"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎AndroidManifest.xml

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package="org.cocos2d"
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android:versionCode="1"
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android:versionName="1.0">
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<application android:label="@string/app_name" android:icon="@drawable/icon">
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<application android:label="@string/app_name" android:icon="@drawable/icon" android:debuggable="true">
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<activity android:name=".Cocos2D"
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android:label="@string/app_name">
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<intent-filter>
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</intent-filter>
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</activity>
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<activity android:name=".tests.JBox2DTest"
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android:debuggable="true"
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android:launchMode="singleInstance"
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android:label="@string/activity_jbox2dtest" android:configChanges="keyboardHidden|orientation" android:screenOrientation="portrait">
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<intent-filter>
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<action android:name="android.intent.action.MAIN"/>
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<category android:name="android.intent.category.TEST"/>
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</intent-filter>
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</activity>
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<activity android:name=".tests.ClickAndMoveTest"
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android:debuggable="true"
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android:launchMode="singleInstance"
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</activity>
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</application>
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<uses-sdk android:minSdkVersion="4"></uses-sdk>
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</manifest>

‎libs/JBox2D-2.0.1-b250-Library.jar

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‎res/values/strings.xml

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<string name="activity_menutest">Menu Test</string>
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<string name="activity_atlastest">Atlas Test</string>
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<string name="activity_atlasspritetest">Atlas Sprite Test</string>
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<string name="activity_jbox2dtest">JBox2D Test</string>
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<string name="activity_clickandmovetest">Click And Move Test</string>
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<string name="activity_cocosnodetest">Cocos Node Test</string>
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<string name="activity_drawprimitivestest">Draw Primitives Test</string>

‎src/org/cocos2d/tests/JBox2DTest.java

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package org.cocos2d.tests;
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import org.cocos2d.events.TouchDispatcher;
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import org.cocos2d.layers.Layer;
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import org.cocos2d.nodes.AtlasSprite;
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import org.cocos2d.nodes.AtlasSpriteManager;
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import org.cocos2d.nodes.Director;
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import org.cocos2d.nodes.Label;
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import org.cocos2d.nodes.Scene;
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import org.cocos2d.nodes.TextureManager;
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import org.cocos2d.opengl.CCGLSurfaceView;
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import org.cocos2d.types.CCColor3B;
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import org.cocos2d.types.CCMacros;
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import org.cocos2d.types.CCPoint;
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import org.cocos2d.types.CCRect;
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import org.cocos2d.types.CCSize;
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import org.jbox2d.collision.AABB;
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import org.jbox2d.collision.shapes.EdgeChainDef;
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import org.jbox2d.collision.shapes.PolygonDef;
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import org.jbox2d.common.Vec2;
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import org.jbox2d.dynamics.Body;
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import org.jbox2d.dynamics.BodyDef;
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import org.jbox2d.dynamics.World;
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import android.app.Activity;
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import android.os.Bundle;
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import android.view.MotionEvent;
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import android.view.Window;
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import android.view.WindowManager;
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/**
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* A test that demonstrates basic JBox2D integration by using AtlasSprites connected to physics bodies.
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* <br/>
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* <br/>
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* This implementation is based on the original Box2DTest (from cocos2d-iphone) but using the JBox2D
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* library and adjusting for differences with the new API as well as some differences in sensitivity
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* (and such) that were observed when testing on the Android platform.
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*
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* @author Ray Cardillo
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*/
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public class JBox2DTest extends Activity {
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private static final String LOG_TAG = JBox2DTest.class.getSimpleName();
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private CCGLSurfaceView mGLSurfaceView;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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requestWindowFeature(Window.FEATURE_NO_TITLE);
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getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
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WindowManager.LayoutParams.FLAG_FULLSCREEN);
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mGLSurfaceView = new CCGLSurfaceView(this);
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setContentView(mGLSurfaceView);
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}
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@Override
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public void onStart() {
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super.onStart();
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// attach the OpenGL view to a window
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Director.sharedDirector().attachInView(mGLSurfaceView);
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// set landscape mode
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Director.sharedDirector().setLandscape(false);
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// show FPS
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Director.sharedDirector().setDisplayFPS(true);
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// frames per second
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Director.sharedDirector().setAnimationInterval(1.0f / 60.0f);
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Scene scene = Scene.node();
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scene.addChild(new JBox2DTestLayer());
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// Make the Scene active
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Director.sharedDirector().runWithScene(scene);
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}
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@Override
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public void onPause() {
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super.onPause();
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Director.sharedDirector().pause();
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}
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@Override
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public void onResume() {
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super.onResume();
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Director.sharedDirector().resume();
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}
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@Override
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public void onDestroy() {
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super.onDestroy();
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TextureManager.sharedTextureManager().removeAllTextures();
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}
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static class JBox2DTestLayer extends Layer {
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public static final int kTagSpriteManager = 1;
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// Pixel to meters ratio. Box2D uses meters as the unit for measurement.
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// This ratio defines how many pixels correspond to 1 Box2D "meter"
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// Box2D is optimized for objects of 1x1 meter therefore it makes sense
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// to define the ratio so that your most common object type is 1x1 meter.
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protected static final float PTM_RATIO = 32.0f;
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// Simulation space should be larger than window per Box2D recommendation.
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protected static final float BUFFER = 1.0f;
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protected final World bxWorld;
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public JBox2DTestLayer() {
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this.isTouchEnabled_ = true;
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this.isAccelerometerEnabled_ = true;
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CCSize s = Director.sharedDirector().winSize();
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float scaledWidth = s.width/PTM_RATIO;
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float scaledHeight = s.height/PTM_RATIO;
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Vec2 lower = new Vec2(-BUFFER, -BUFFER);
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Vec2 upper = new Vec2(scaledWidth+BUFFER, scaledHeight+BUFFER);
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Vec2 gravity = new Vec2(0.0f, -10.0f);
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bxWorld = new World(new AABB(lower, upper), gravity, true);
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bxWorld.setContinuousPhysics(true);
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bxWorld.setPositionCorrection(true);
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// TODO: JBox2D debug drawing is a bit different now. We could add debug drawing the old way, but looks like that is going away soon.
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/*
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GLESDebugDraw debugDraw = new GLESDebugDraw( PTM_RATIO );
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bxWorld.setDebugDraw(debugDraw);
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int flags = 0;
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flags |= DebugDraw.e_shapeBit;
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flags |= DebugDraw.e_jointBit;
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flags |= DebugDraw.e_aabbBit;
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flags |= DebugDraw.e_pairBit;
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flags |= DebugDraw.e_centerOfMassBit;
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debugDraw.setFlags(flags);
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*/
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BodyDef bxGroundBodyDef = new BodyDef();
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bxGroundBodyDef.position.set(0.0f, 0.0f);
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Body bxGroundBody = bxWorld.createBody(bxGroundBodyDef);
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EdgeChainDef bxGroundOutsideEdgeDef = new EdgeChainDef();
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bxGroundOutsideEdgeDef.addVertex(new Vec2(0f,0f));
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bxGroundOutsideEdgeDef.addVertex(new Vec2(0f,scaledHeight));
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bxGroundOutsideEdgeDef.addVertex(new Vec2(scaledWidth,scaledHeight));
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bxGroundOutsideEdgeDef.addVertex(new Vec2(scaledWidth,0f));
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bxGroundOutsideEdgeDef.addVertex(new Vec2(0f,0f));
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bxGroundBody.createShape(bxGroundOutsideEdgeDef);
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AtlasSpriteManager mgr = new AtlasSpriteManager("blocks.png", 150);
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addChild(mgr, 0, kTagSpriteManager);
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addNewSpriteWithCoords(CCPoint.ccp(s.width / 2.0f, s.height / 2.0f));
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Label label = Label.label("Tap screen", "DroidSans", 32);
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label.setPosition(s.width / 2f, s.height - 50f);
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label.setColor(new CCColor3B(0, 0, 255));
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addChild(label);
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// schedule the physics update processor
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this.schedule("tick");
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}
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private void addNewSpriteWithCoords(CCPoint pos) {
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AtlasSpriteManager mgr = (AtlasSpriteManager) getChild(kTagSpriteManager);
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// We have a 64x64 sprite sheet with 4 different 32x32 images. The following code is
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// just randomly picking one of the images
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int idx = (CCMacros.CCRANDOM_0_1() > 0.5f ? 0:1);
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int idy = (CCMacros.CCRANDOM_0_1() > 0.5f ? 0:1);
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AtlasSprite sprite = AtlasSprite.sprite(CCRect.make(idx * 32f, idy * 32f, 32f, 32f), mgr);
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mgr.addChild(sprite);
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sprite.setPosition(pos.x, pos.y);
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// Define the dynamic body.
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// Set up a 1m squared box in the physics world
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BodyDef bxSpriteBodyDef = new BodyDef();
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bxSpriteBodyDef.userData = sprite;
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bxSpriteBodyDef.position.set(pos.x/PTM_RATIO, pos.y/PTM_RATIO);
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bxSpriteBodyDef.linearDamping = 0.3f;
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// Define another box shape for our dynamic body.
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PolygonDef bxSpritePolygonDef = new PolygonDef();
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bxSpritePolygonDef.setAsBox(0.5f, 0.5f);
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bxSpritePolygonDef.density = 1.0f;
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bxSpritePolygonDef.friction = 0.3f;
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synchronized(bxWorld) {
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Body bxSpriteBody = bxWorld.createBody(bxSpriteBodyDef);
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// Define the dynamic body fixture and set mass so it's dynamic.
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bxSpriteBody.createShape(bxSpritePolygonDef);
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bxSpriteBody.setMassFromShapes();
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}
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}
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public void tick(float delta) {
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// It is recommended that a fixed time step is used with Box2D for stability
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// of the simulation, however, we are using a variable time step here.
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// You need to make an informed choice, the following URL is useful
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// http://gafferongames.com/game-physics/fix-your-timestep/
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// Instruct the world to perform a simulation step. It is
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// generally best to keep the time step and iterations fixed.
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synchronized(bxWorld) {
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bxWorld.step(delta, 10);
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}
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// Iterate over the bodies in the physics world
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for (Body b = bxWorld.getBodyList(); b != null; b = b.getNext()) {
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Object userData = b.getUserData();
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if (userData != null && userData instanceof AtlasSprite) {
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// Synchronize the AtlasSprite position and rotation with the corresponding body
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AtlasSprite sprite = (AtlasSprite)userData;
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sprite.setPosition(b.getPosition().x * PTM_RATIO, b.getPosition().y * PTM_RATIO);
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sprite.setRotation(-1.0f * CCMacros.CC_RADIANS_TO_DEGREES(b.getAngle()));
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}
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}
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}
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@Override
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public boolean ccTouchesBegan(MotionEvent event) {
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CCPoint location = Director.sharedDirector().convertCoordinate(event.getX(), event.getY());
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addNewSpriteWithCoords(location);
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return TouchDispatcher.kEventHandled;
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}
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@Override
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public void ccAccelerometerChanged(float accelX, float accelY, float accelZ) {
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// no filtering being done in this demo (just magnify the gravity a bit)
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Vec2 gravity = new Vec2( accelX * -2.00f, accelY * -2.00f );
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bxWorld.setGravity( gravity );
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}
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}
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}

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