实例介绍
【实例简介】
【实例截图】
【核心代码】
package com.bh;
import java.util.Random;
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 org.jbox2d.dynamics.joints.DistanceJoint;
import org.jbox2d.dynamics.joints.DistanceJointDef;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.util.Log;
import android.view.MotionEvent;
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;
public Context context;
// ---添加物理世界
private float RATE = 30;
private World world;
private float stepTime = 1f / 60f;
private int iteraTions = 10;
// 背景图
private Bitmap bmpBg;
// 添加砖块
private Bitmap bmp, bmpTile1, bmpTile2, bmpTile3;
// 随机图块
private Random random;
private int ran;
//声明绑定在距离关节上的固定Body坐标与宽高
private int bodyWallX;
private int bodyWallY;
private int bodyWallW;
private int bodyWallH;
//与距离关节绑定的固定Body
private Body bodyWall;
//初始化游戏时绑定在距离关节的砖块
private Body bodyHouse;
//创建临时Body，用于记录上一次绑定在距离关节上的砖块
private Body bodyTemp;
// ---线条的颜色值
private int[] lineColor = { 0xFFDACDC5, 0xFF825B56, 0xFF3A3E59 };
// ---添加一个距离关节
private DistanceJoint dj;
// ---添加body和joint的容器
private boolean isDown;
private int isDownCount = 0;//下落计时器
private boolean isDeleteJoint;
public MySurfaceView(Context context) {
super(context);
this.context = context;
this.setKeepScreenOn(true);
sfh = this.getHolder();
sfh.addCallback(this);
paint = new Paint();
paint.setColor(Color.RED);
paint.setStyle(Style.STROKE);
paint.setAntiAlias(true);
setFocusable(true);
setFocusableInTouchMode(true);
// ---添加物理世界
AABB aabb = new AABB();
aabb.lowerBound = new Vec2(-100, -100);
aabb.upperBound = new Vec2(100, 100);
Vec2 gravity = new Vec2(0, 10);
world = new World(aabb, gravity, true);
// --实例背景图
bmpBg = BitmapFactory.decodeResource(context.getResources(), R.drawable.background);
// 实例砖块图片
bmpTile1 = BitmapFactory.decodeResource(context.getResources(), R.drawable.tile1);
bmpTile2 = BitmapFactory.decodeResource(context.getResources(), R.drawable.tile2);
bmpTile3 = BitmapFactory.decodeResource(context.getResources(), R.drawable.tile3);
}
//创建view与游戏初始化
public void surfaceCreated(SurfaceHolder holder) {
bodyWallW = 40;
bodyWallH = 2;
bodyWallX = getWidth() / 2 - bodyWallW / 2;
bodyWallY = 1;
// 实例游戏初始两个绑定距离关节的Body
bodyWall = createPolygon(bodyWallX, bodyWallY, bodyWallW, bodyWallH, 0, 0);
bodyHouse = createMyTile(bodyWallX / 2, bodyWallY bodyWallH 50, bmpTile1.getWidth(), bmpTile1.getHeight(), 0, 1);
//实例临时Body
bodyTemp = bodyHouse;
// 添加一个静态的下边界用于阻挡掉落的body
createPolygon(0, getHeight(), getWidth() - 10, 10, 0, 0);
// ---添加一个距离关节
dj = createDistanceJoint(bodyWall, bodyHouse);
th = new Thread(this);
flag = true;
th.start();
}
//创建距离关节
public DistanceJoint createDistanceJoint(Body body1, Body body2) {
//创建距离关节信息
DistanceJointDef dj = new DistanceJointDef();
dj.body1 = body1;
dj.body2 = body2;
//初始化距离关节
dj.initialize(body1, body2, body1.getWorldCenter(), body2.getWorldCenter());
//通过World创建一个距离关节对象
return (DistanceJoint) world.createJoint(dj);
}
//创建装块
public Body createMyTile(float x, float y, float w, float h, float angle, float density) {
PolygonDef pd = new PolygonDef();
pd.density = density;
pd.friction = 0.8f;
pd.restitution = 0.3f;
pd.setAsBox(w / 2 / RATE, h / 2 / RATE);
pd.filter.groupIndex = 2;
BodyDef bd = new BodyDef();
bd.position.set((x w / 2) / RATE, (y h / 2) / RATE);
bd.angle = (float) (angle * Math.PI / 180);
Body body = world.createBody(bd);
//实例随机库
random = new Random();
//取出0-2的随机整数
ran = random.nextInt(3);
if (ran == 0)
bmp = bmpTile1;
else if (ran == 1)
bmp = bmpTile2;
else if (ran == 2)
bmp = bmpTile3;
body.m_userData = new MyTile(x, y, w, h, bmp);
body.createShape(pd);
body.setMassFromShapes();
return body;
}
//创建矩形Body
public Body createPolygon(float x, float y, float w, float h, float angle, float density) {
PolygonDef pd = new PolygonDef();
pd.density = density;
pd.friction = 0.8f;
pd.restitution = 0.3f;
pd.setAsBox(w / 2 / RATE, h / 2 / RATE);
BodyDef bd = new BodyDef();
bd.position.set((x w / 2) / RATE, (y h / 2) / RATE);
bd.angle = (float) (angle * Math.PI / 180);
Body body = world.createBody(bd);
body.m_userData = new MyRect(x, y, w, h);
body.createShape(pd);
body.setMassFromShapes();
return body;
}
//绘制函数
public void draw() {
try {
//获取画布实例
canvas = sfh.lockCanvas();
//刷屏
canvas.drawColor(Color.BLACK);
//绘制游戏背景图
canvas.drawBitmap(bmpBg, 0, -Math.abs(getHeight() - bmpBg.getHeight()), paint);
//遍历绘制Body
Body body = world.getBodyList();
for (int i = 1; i < world.getBodyCount(); i ) {
if ((body.m_userData) instanceof MyRect) {
MyRect rect = (MyRect) (body.m_userData);
rect.drawRect(canvas, paint);
} else if ((body.m_userData) instanceof MyTile) {
MyTile tile = (MyTile) (body.m_userData);
tile.drawMyTile(canvas, paint);
}
body = body.m_next;
}
if (bodyWall != null && bodyHouse != null) {
if (dj != null) {
//设置画笔颜色
//lineColor:int 数组 ，保存三种颜色值；分别表示不同方砖的悬挂绳颜色
paint.setColor(lineColor[ran]);
//设置画笔的粗细程度
paint.setStrokeWidth(3);
//绘制关节
canvas.drawLine(bodyWall.getPosition().x * RATE, bodyWall.getPosition().y * RATE, bodyTemp.getPosition().x * RATE, bodyTemp.getPosition().y
* RATE, paint);
}
}
} catch (Exception e) {
// TODO: handle exception
} finally {
try {
if (canvas != null)
sfh.unlockCanvasAndPost(canvas);
} catch (Exception e2) {
}
}
}
//逻辑处理函数
private void logic() {
//物理世界模拟
world.step(stepTime, iteraTions);
///遍历Body，进行Body与图形之间的传递数据
Body body = world.getBodyList();
for (int i = 1; i < world.getBodyCount(); i ) {
//判定m_userData中的数据是否为MyRect实例
if ((body.m_userData) instanceof MyRect) {
MyRect rect = (MyRect) (body.m_userData);
rect.setX(body.getPosition().x * RATE - rect.getWidth() / 2);
rect.setY(body.getPosition().y * RATE - rect.getHeight() / 2);
rect.setAngle((float) (body.getAngle() * 180 / Math.PI));
} else if ((body.m_userData) instanceof MyTile) {
//判定m_userData中的数据是否为MyTile实例
MyTile tile = (MyTile) (body.m_userData);
tile.setX(body.getPosition().x * RATE - tile.getWidth() / 2);
tile.setY(body.getPosition().y * RATE - tile.getHeight() / 2);
tile.setAngle((float) (body.getAngle() * 180 / Math.PI));
}
body = body.m_next;
}
if (isDeleteJoint) {
world.destroyJoint(dj);// 销毁关节
dj = null;
isDeleteJoint = false;
}
//动态Body是否下落
if (isDown == true) {
//计时器计时
isDownCount ;
//计时器时间
if (isDownCount % 120 == 0) {
//创建新的动态Body-砖块，并且使用临时Body保存最新动态Body
bodyTemp = createMyTile(bodyWallX / 2, bodyWallY bodyWallH 50, bmpTile1.getWidth(), bmpTile1.getHeight(), 0, 1);
//创建新的距离关节
dj = createDistanceJoint(bodyWall, bodyTemp);
//计时器重置
isDownCount = 0;
//下落标识重置
isDown = false;
}
}
}
//触屏事件
@Override
public boolean onTouchEvent(MotionEvent event) {
if (isDown == false) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
//删除关节
isDeleteJoint = true;
//动态Body下落
isDown = true;
}
}
return true;
}
//线程
public void run() {
// TODO Auto-generated method stub
while (flag) {
logic();
draw();
try {
Thread.sleep((long) stepTime * 1000);
} catch (Exception ex) {
}
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Log.v("Himi", "surfaceChanged");
}
public void surfaceDestroyed(SurfaceHolder holder) {
flag = false;
Log.v("Himi", "surfaceDestroyed");
}
}
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