小程序源码 (可视区域).rar

package com.ccp; 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.Rect; import android.graphics.Region; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.SurfaceHolder.Callback; /** * * @author Himi * */ public class MySurfaceView extends SurfaceView implements Callback, Runnable { //用于控制SurfaceView private SurfaceHolder sfh; //声明一个画笔 private Paint paint; //声明一条线程 private Thread th; //线程消亡的标识位 private boolean flag; //声明一个画布 private Canvas canvas; //声明屏幕的宽高 private int screenW, screenH; private Bitmap bmp; /** * SurfaceView初始化函数 */ public MySurfaceView(Context context) { super(context); //实例SurfaceHolder sfh = this.getHolder(); //为SurfaceView添加状态监听 sfh.addCallback(this); //实例一个画笔 paint = new Paint(); //设置画笔颜色为白色 paint.setColor(Color.WHITE); //设置画笔无锯齿 paint.setAntiAlias(true); //设置焦点 setFocusable(true); bmp = BitmapFactory.decodeResource(this.getResources(), R.drawable.image); } /** * SurfaceView视图创建，响应此函数 */ @Override public void surfaceCreated(SurfaceHolder holder) { screenW = this.getWidth(); screenH = this.getHeight(); flag = true; //实例线程 th = new Thread(this); //启动线程 th.start(); } /** * 游戏绘图 */ public void myDraw() { try { canvas = sfh.lockCanvas(); if (canvas != null) { canvas.drawColor(Color.BLACK); //----设置矩形可视区域 //canvas.save(); //canvas.clipRect(0, 0, 20, 20); //canvas.drawBitmap(bmp, 0, 0, paint); //canvas.restore(); //----利用Path设置可视区域 //canvas.save(); //Path path = new Path(); //path.addCircle(30, 30, 30, Direction.CCW); //canvas.clipPath(path); //canvas.drawBitmap(bmp, 0, 0, paint); //canvas.restore(); //----利用Region设置可视区域 canvas.save(); Region region = new Region(); region.op(new Rect(20,20,100,100), Region.Op.UNION); region.op(new Rect(40,20,80,150), Region.Op.XOR); canvas.clipRegion(region); canvas.drawBitmap(bmp, 0, 0, paint); canvas.restore(); } } catch (Exception e) { // TODO: handle exception } finally { if (canvas != null) sfh.unlockCanvasAndPost(canvas); } } /** * 触屏事件监听 */ @Override public boolean onTouchEvent(MotionEvent event) { return true; } /** * 按键事件监听 */ @Override public boolean onKeyDown(int keyCode, KeyEvent event) { return super.onKeyDown(keyCode, event); } /** * 游戏逻辑 */ private void logic() { } @Override public void run() { while (flag) { long start = System.currentTimeMillis(); myDraw(); logic(); long end = System.currentTimeMillis(); try { if (end - start < 50) { Thread.sleep(50 - (end - start)); } } catch (InterruptedException e) { e.printStackTrace(); } } } /** * SurfaceView视图状态发生改变，响应此函数 */ @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } /** * SurfaceView视图消亡时，响应此函数 */ @Override public void surfaceDestroyed(SurfaceHolder holder) { flag = false; } }