Android应用源码之(Body碰撞监听-IT计算机-毕业设计.zip

package com.bc; import org.jbox2d.collision.AABB; import org.jbox2d.collision.CircleDef; import org.jbox2d.collision.Shape; import org.jbox2d.common.Vec2; import org.jbox2d.dynamics.Body; import org.jbox2d.dynamics.BodyDef; import org.jbox2d.dynamics.ContactFilter; import org.jbox2d.dynamics.ContactListener; import org.jbox2d.dynamics.World; import org.jbox2d.dynamics.contacts.ContactPoint; import org.jbox2d.dynamics.contacts.ContactResult; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Paint.Style; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.SurfaceHolder.Callback; public class MySurfaceView extends SurfaceView implements Callback, Runnable, ContactListener, ContactFilter { private Thread th; private SurfaceHolder sfh; private Canvas canvas; private Paint paint; private boolean flag; // ----添加一个物理世界---->> final float RATE = 30;// 屏幕到现实世界的比例 30px：1m; World world;// 声明一个物理世界对象 AABB aabb;// 声明一个物理世界的范围对象 Vec2 gravity;// 声明一个重力向量对象 float timeStep = 1f / 60f;// 物理世界模拟的的频率 int iterations = 10;// 迭代值，迭代越大模拟越精确，但性能越低 // --->>给第一个Body赋予力 Body body1, body2; /* Shape 里的 m_isSensor 属性表示发生碰撞但是不产生碰撞效果 */ public MySurfaceView(Context context) { super(context); this.setKeepScreenOn(true); sfh = this.getHolder(); sfh.addCallback(this); paint = new Paint(); paint.setAntiAlias(true); paint.setStyle(Style.STROKE); this.setFocusable(true); // --添加一个物理世界--->> aabb = new AABB();// 实例化物理世界的范围对象 gravity = new Vec2(0, 10);// 实例化物理世界重力向量对象 aabb.lowerBound.set(-100, -100);// 设置物理世界范围的左上角坐标 aabb.upperBound.set(100, 100);// 设置物理世界范围的右下角坐标 world = new World(aabb, gravity, true);// 实例化物理世界对象 // ----在物理世界中添加两个动态圆形Body body1 = createCircle(39, 17, 10, false); body2 = createCircle(30, 47, 10, false); body1.getShapeList().getFilterData().groupIndex = 1;// 定义body1分组1 body1.getShapeList().getFilterData().maskBits = 2;// 指定body1碰撞种类为2 body2.getShapeList().getFilterData().groupIndex = 2;// 定义body2分组2 body2.getShapeList().getFilterData().categoryBits = 2;// 定义body2种类为2 // 添加屏幕下方添加多个静态物体 for (int i = 0; i < 5; i++) { Body body = createCircle(i * 20, 100, 10, true); body.getShapeList().getFilterData().groupIndex = 3; body.getShapeList().getFilterData().categoryBits = 4;// 定义静态body种类为4 } //为物理世界设置碰撞监听 world.setContactListener(this); // 碰撞筛选器比监听器更加的具有扩展性，可以在筛选器中实现监听器的功能； // 但是由于自由度太大，一般不推荐使用 // world.setContactFilter(this); } public void surfaceCreated(SurfaceHolder holder) { flag = true; th = new Thread(this); th.start(); } public Body createCircle(float x, float y, float r, boolean isStatic) { CircleDef cd = new CircleDef(); if (isStatic) { cd.density = 0; } else { cd.density = 1; } cd.friction = 0.8f; cd.restitution = 0.3f; cd.radius = r / RATE; BodyDef bd = new BodyDef(); bd.position.set((x + r) / RATE, (y + r) / RATE); Body body = world.createBody(bd); body.m_userData = new MyCircle(x, y, r); body.createShape(cd); body.setMassFromShapes(); return body; } public void myDraw() { try { canvas = sfh.lockCanvas(); if (canvas != null) { canvas.drawColor(Color.WHITE); Body body = world.getBodyList(); for (int i = 1; i < world.getBodyCount(); i++) { ((MyCircle) body.m_userData).draw(canvas, paint); body = body.m_next; } } } catch (Exception e) { Log.e("Himi", "myDraw is Error!"); } finally { if (canvas != null) sfh.unlockCanvasAndPost(canvas); } } public void Logic() { // --开始模拟物理世界--->> world.step(timeStep, iterations);// 物理世界进行模拟 // 取出body链表表头 Body body = world.getBodyList(); for (int i = 1; i < world.getBodyCount(); i++) { // 设置MyCircle的X，Y坐标 MyCircle mc = (MyCircle) body.m_userData; mc.setX(body.getPosition().x * RATE - mc.r); mc.setY(body.getPosition().y * RATE - mc.r); // 将链表指针指向下一个body元素 body = body.m_next; } } public void run() { while (flag) { myDraw(); Logic(); try { Thread.sleep((long) timeStep * 1000); } catch (Exception ex) { Log.e("Himi", "Thread is Error!"); } } } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } public void surfaceDestroyed(SurfaceHolder holder) { flag = false; } // ----->>ContactListener监听器 @Override public void add(ContactPoint arg0) { //每当有碰撞会调用此函数添加新的接触点 } @Override public void persist(ContactPoint arg0) { // 持续碰撞调用此函数 } @Override public void remove(ContactPoint arg0) { //脱离碰撞调用此函 } @Override public void result(ContactResult arg0) { // 发生碰撞（有新的接触点被监听到）会调用此函数 // 持续碰撞时也会调用此函数 } // -----碰撞筛选器 @Override public boolean shouldCollide(Shape shape1, Shape shape2) { return false; } }