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import java.util.Random; import org.jbox2d.collision.AABB; import org.jbox2d.collision.CircleDef; import org.jbox2d.collision.PolygonDef; import org.jbox2d.common.Vec2; import org.jbox2d.dynamics.Body; import org.jbox2d.dynamics.BodyDef; import org.jbox2d.dynamics.World; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Paint.Style; import android.view.View; public class PhysicsWorld extends View{ protected static final int GUIUPDATEIDENTIFIER = 0x231; public int targetFPS = 40; public float timeStep = 10.0f / targetFPS; public int iterations = 5; private Body[] bodies; private int count = 0; private AABB worldAABB; public World world; private PolygonDef groundShapeDef; public int World_W,World_H; private Paint paint; private float radius=10; public PhysicsWorld(Context context,int W,int H) { super(context); World_W=W; World_H=H; // Step 1: Create Physics World Boundaries worldAABB = new AABB(); Vec2 min = new Vec2(-50, -50); Vec2 max = new Vec2(World_W + 50, World_H + 50); worldAABB.lowerBound.set(min); worldAABB.upperBound.set(max); // Step 2: Create Physics World with Gravity Vec2 gravity = new Vec2((float) 0.0, (float) -10.0); boolean doSleep = true; world = new World(worldAABB, gravity, doSleep); // Step 3: //Create Ground Box : BodyDef bodyDef = new BodyDef(); bodyDef.position.set(new Vec2((float) 0.0, (float) -10.0)); Body groundBody = world.createBody(bodyDef); groundShapeDef = new PolygonDef(); groundShapeDef.setAsBox((float) World_W, (float) 10); groundBody.createShape(groundShapeDef); // up : bodyDef = new BodyDef(); bodyDef.position.set(new Vec2((float) 0.0, (float) (World_H+10.0) )); groundBody = world.createBody(bodyDef); groundShapeDef = new PolygonDef(); groundShapeDef.setAsBox((float) World_W, (float) 10); groundBody.createShape(groundShapeDef); // left : bodyDef = new BodyDef(); bodyDef.position.set(new Vec2((float) -10, (float) 0.0 )); groundBody = world.createBody(bodyDef); groundShapeDef = new PolygonDef(); groundShapeDef.setAsBox((float)10, (float) World_H); groundBody.createShape(groundShapeDef); // right : bodyDef = new BodyDef(); bodyDef.position.set(new Vec2((float) World_W+10, (float) 0.0 )); groundBody = world.createBody(bodyDef); groundShapeDef = new PolygonDef(); groundShapeDef.setAsBox((float)10, (float) World_H); groundBody.createShape(groundShapeDef); // // step 4: initialize bodies=new Body[50]; // paint=new Paint(); paint.setStyle(Style.FILL); paint.setColor(Color.RED); } public void addBall() { // Create Dynamic Body BodyDef bodyDef = new BodyDef(); Random rnd = new Random(); bodyDef.position.set((float) radius*2+rnd.nextInt( (int)(World_W-radius*4) ), (float)2*radius+ rnd.nextInt( (int)(World_H-radius*4) )); bodies[count] = world.createBody(bodyDef); // Create Shape with Properties CircleDef circle = new CircleDef(); circle.radius = (float) radius; circle.density = (float) 1.0; circle.restitution=0.5f; // Assign shape to Body bodies[count].createShape(circle); bodies[count].setMassFromShapes(); // Increase Counter count += 1; } public void update() { world.step( timeStep , iterations); postInvalidate(); } @Override protected void onDraw(Canvas canvas) { // draw balls // for(int j = 0;j