Android移植Jbox2D testbed

package com.tszy.jbox2d.testbed.framework; import org.jbox2d.callbacks.DebugDraw; import org.jbox2d.callbacks.QueryCallback; import org.jbox2d.collision.AABB; import org.jbox2d.common.Vec2; import org.jbox2d.dynamics.Body; import org.jbox2d.dynamics.BodyDef; import org.jbox2d.dynamics.BodyType; import org.jbox2d.dynamics.Fixture; import org.jbox2d.dynamics.World; import org.jbox2d.dynamics.joints.Joint; import org.jbox2d.dynamics.joints.MouseJoint; import org.jbox2d.dynamics.joints.MouseJointDef; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Paint.Style; import android.graphics.Rect; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceHolder.Callback; import android.view.SurfaceView; /** * 测试基类 * * @author JianbinZhu * */ public abstract class TestbedView extends SurfaceView implements Callback, Runnable { public static final int GAME_HEART = 1000 / 30; // 每秒刷新30次 public static final float RATE = 30.0f; // 比例尺 public static int screenW, screenH; private Thread thread; private SurfaceHolder holder; protected Paint paint; protected World world; protected MouseJointDef mouseJointDef; protected MouseJoint mouseJoint; protected Body m_ground; private MyDebugDraw debugDraw; //调试绘图 private float dt = 1.0f/30.0f; //模拟频率 private int velIter = 8; //速度迭代次数 private int posIter = 3; //位置迭代次数 public TestbedView(Context context) { super(context); // TODO Auto-generated constructor stub init(); } ///////////////////////////////////////////////////////////////////////// private void init() { holder = getHolder(); holder.addCallback(this); paint = new Paint(Paint.ANTI_ALIAS_FLAG);// 无锯齿 paint.setStyle(Style.FILL); // 填充样式 paint.setTextSize(12); // 字体大小 } private void initWorld() { Vec2 gravity = new Vec2(0, -10f); world = new World(gravity, true); BodyDef bodyDef = new BodyDef(); m_ground = world.createBody(bodyDef); mouseJointDef = new MouseJointDef(); debugDraw = new MyDebugDraw(this);//DebugDraw.e_aabbBit | debugDraw.setFlags( DebugDraw.e_shapeBit | DebugDraw.e_jointBit | DebugDraw.e_centerOfMassBit); world.setDebugDraw(debugDraw); } private void destoryWorld(){ Body body = world.getBodyList(); for(int i=0; i<world.getBodyCount(); ++i){ if(body != null) world.destroyBody(body); body = body.getNext(); } Joint joint = world.getJointList(); for(int i=0; i<world.getJointCount(); ++i){ if(joint != null) world.destroyJoint(joint); joint = joint.getNext(); } world = null; debugDraw = null; mouseJointDef = null; m_ground = null; } public World getWorld() { return world; } //////////////////////////////////////////////////////////////////////////////// /** * 执行游戏逻辑方法 */ public void _update() { world.step(dt, velIter, posIter); } private Rect rect = new Rect(); public void drawDeclare(Canvas canvas) { String text = "天使之翼的示例Demo"; // 获取文本宽高 paint.getTextBounds(text, 0, text.length(), rect); // 在屏幕中央位置显示文本 paint.setColor(0xfff000f0); // 注意最高两位 ff 代表画笔透明度，不设置的画就是完全透明了，看不到任何效果 canvas.drawText(text, (screenW - rect.width()) / 2, screenH / 2 + rect.height() / 2, paint); } /** * 设置画笔颜色 * @param color */ public void setColor(int color) { int red = (color & 0xff0000) >> 16; int green = (color & 0x00ff00) >> 8; int blue = (color & 0x0000ff); paint.setColor(Color.rgb(red, green, blue)); } /** * 绘制FPS * @param canvas */ private void drawFPS(Canvas canvas) { setColor(0x00ff00); if (useTime > 0){ canvas.drawText("FPS:" + (1000 / useTime), 3, 3 + paint.getTextSize(), paint); } } /** * BOX2D 调试绘图 * @param canvas */ public void worldDraw(Canvas canvas) { debugDraw.draw(canvas); world.drawDebugData(); } /** * 画鼠标关节 */ private Vec2 v1 = new Vec2(); private Vec2 v2 = new Vec2(); private void mouseJointDraw(Canvas canvas) { // 画鼠标关节 if (mouseJoint != null) { paint.setColor(0xff00ff00); mouseJoint.getAnchorA(v1); //转换成视角中的位置 debugDraw.getWorldToScreenToOut(v1, v1); mouseJoint.getAnchorB(v2); //转换成视角中的位置 debugDraw.getWorldToScreenToOut(v2, v2); canvas.drawLine(v1.x, v1.y, v2.x, v2.y, paint); } } /** * 执行游戏绘制 */ public void _draw(Canvas canvas) { canvas.drawColor(Color.BLACK); worldDraw(canvas); mouseJointDraw(canvas); drawFPS(canvas); //drawDeclare(canvas); } public abstract void initTest(); public abstract String getName(); //////////////////////////////////////////////////////////////////////////////// /** * 世界位置转为屏幕位置 * @param p * @return */ public static Vec2 world2Scn(Vec2 p) { Vec2 out = new Vec2(); world2ScnOut(p, out); return out; } public static void world2ScnOut(Vec2 p, Vec2 out) { out.set(p.x*RATE, p.y*RATE); } /** * 屏幕位置转为世界位置 * @param p * @return */ public static Vec2 scn2wrold(Vec2 p) { Vec2 out = new Vec2(); scn2wroldOut(p, out); return out; } public static void scn2wroldOut(Vec2 p, Vec2 out) { out.set(p.x/RATE, p.y/RATE); } /////////////////////////////////////////////////////////////////////////////// @Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub boolean b = false; b = mouseJointEvent(event); if(!b) b = debugDraw.onTouchEvent(event); if(!b) return super.onTouchEvent(event); return b; } //点击查询 private final AABB queryAABB = new AABB(); private final TestQueryCallback callback = new TestQueryCallback(); private Body mouseDragBody; //当前鼠标拽住的物体 private final Vec2 mouseDownPoint = new Vec2(0, 0); private boolean mouseJointEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); // mouseDownPoint.set(event.getX(), event.getY()); // scn2wroldOut(mouseDownPoint, mouseDownPoint); //视角中的位置 debugDraw.getScreenToWorldToOut(x, y, mouseDownPoint); switch (event.getAction()) { case MotionEvent.ACTION_DOWN : { if (mouseJoint != null) { world.destroyJoint(mouseJoint); mouseJoint = null; mouseDragBody = null; } //得转化为在世界中的位置，因为点击的位置只是看到的相对位置而已 queryAABB.lowerBound.set(mouseDownPoint.x - 3/RATE, mouseDownPoint.y - 3/RATE); queryAABB.upperBound.set(mouseDownPoint.x + 3/RATE, mouseDownPoint.y + 3/RATE); world.queryAABB(callback, queryAABB); if (mouseDragBody != null) { mouseJointDef.bodyA = m_ground; mouseJointDef.bodyB = mouseDragBody; mouseJointDef.target.set(mouseDownPoint); // 目的点 mouseJointDef.maxForce = 1000f * mouseDragBody.getMass(); // 最大拉力 mouseJoint = (MouseJoint) world.createJoint(mouseJointDef); // 鼠标关节 mouseDragBody.setAwake(true); // 唤醒body return true; } break; } case MotionEvent.ACTION_MOVE : { if (mouseJoint != null) { mouseJoint.setTarget(mouseDownPoint); return true; } break; } case MotionEvent.ACTION_UP : { if (mouseJoint != null) { world.destroyJoint(mouseJoint); mouseJoint = null; mouseDragBody = null; return true; } break; } } return false; } //查询回调 class TestQueryCallback implements QueryCallback { /** * 报告查询结果，返回false终止查询 */ @Override public boolean reportFixture(Fi