package com.tianyun.myworld;
import org.jbox2d.collision.AABB;
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.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.SurfaceHolder.Callback;
public class MySurfaceView extends SurfaceView implements Callback, Runnable {
private Thread th;
private SurfaceHolder sfh;
private Canvas canvas;
private Paint paint;
private boolean flag;
// ---添加物理世界----->>
final float RATE = 30;
World world;
AABB aabb;
Vec2 gravity;
float timeStep = 1f / 60f;
final int iterations = 10;
// ----在物理世界中添加一个多边形--->>
Body body;// 声明物体对象
float polygonX = 5;// 声明矩形X坐标
float polygonY = 10;// 声明矩形Y坐标
float polygonWidth = 50;// 声明矩形宽度
float polygonHeight = 50;// 声明矩形高度
// ----在物理世界中添加一个多边形--->>
Body body2;// 声明物体对象
float polygonX2 = 5;// 声明矩形X坐标
float polygonY2 = 800;// 声明矩形Y坐标
float polygonWidth2 = 50;// 声明矩形宽度
float polygonHeight2 = 50;// 声明矩形高度
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);
setFocusable(true);
// ---添加物理世界-->>
aabb = new AABB();
gravity = new Vec2(0f, 10f);
aabb.lowerBound.set(-1000f, -1000f);
aabb.upperBound.set(1000f, 1000f);
world = new World(aabb, gravity, true);
// ----在物理世界中添加一个多边形--->>
body = createPolygon(polygonX, polygonY, polygonWidth, polygonHeight,
false);// 创建一个多边形
// ----在物理世界中添加一个多边形--->>
body2 = createPolygon(polygonX2, polygonY2, polygonWidth2,
polygonHeight2, true);// 创建一个多边形
}
public void surfaceCreated(SurfaceHolder holder) {
flag = true;
th = new Thread(this);
th.start();
}
public Body createPolygon(float x, float y, float width, float height,
boolean isStatic) {
// ---创建多边形皮肤
PolygonDef pd = new PolygonDef(); // 实例一个多边形的皮肤
if (isStatic) {
pd.density = 0; // 设置多边形为静态
} else {
pd.density = 1; // 设置多边形的质量
}
pd.friction = 0.8f; // 设置多边形的摩擦力
pd.restitution = 0.3f; // 设置多边形的恢复力
// 设置多边形快捷成盒子(矩形)
// 两个参数为多边形宽高的一半
pd.setAsBox(width / 2 / RATE, height / 2 / RATE);
// ---创建刚体
BodyDef bd = new BodyDef(); // 实例一个刚体对象
bd.position.set((x + width / 2) / RATE, (y + height / 2) / RATE);// 设置刚体的坐标
// ---创建Body（物体）
Body body = world.createBody(bd); // 物理世界创建物体
body.createShape(pd); // 为Body添加皮肤
body.setMassFromShapes(); // 将整个物体计算打包
return body;
}
public void myDraw() {
try {
canvas = sfh.lockCanvas();
if (canvas != null) {
canvas.drawColor(Color.WHITE);
canvas.drawRect(polygonX, polygonY, polygonX + polygonWidth,
polygonY + polygonHeight, paint);// 绘画矩形
canvas.drawRect(polygonX2, polygonY2,
polygonX2 + polygonWidth2, polygonY2 + polygonHeight2,
paint);// 绘画矩形
}
} catch (Exception e) {
Log.e("Himi", "myDraw is Error!");
} finally {
if (canvas != null)
sfh.unlockCanvasAndPost(canvas);
}
}
public void Logic() {
// ----物理世界进行模拟
world.step(timeStep, iterations);
Vec2 position = body.getPosition();
polygonX = position.x * RATE - polygonWidth / 2;
polygonY = position.y * RATE - polygonHeight / 2;
Vec2 position2 = body2.getPosition();
polygonX2 = position2.x * RATE - polygonWidth2 / 2;
polygonY2 = position2.y * RATE - polygonHeight2 / 2;
}
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;
}
}

暖
====祝top gear早日回归====