Android游戏开发基础part4--Bitmap位图的渲染与操作

package com.bitmap;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;

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;
//声明一个线程
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;
//声明位图对象
private Bitmap bmp;
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);
//设置焦点
setFocusable(true);
bmp =BitmapFactory.decodeResource(this.getResources(), R.drawable.ic_launcher);

}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
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);
//----绘制位图
//canvas.drawBitmap(bmp, 0,0, paint);
//----旋转位图
//canvas.save();
//canvas.rotate(30, bmp.getWidth()/2, bmp.getHeight()/2);
//canvas.drawBitmap(bmp, 0,0, paint);
//canvas.restore();
//canvas.drawBitmap(bmp, 100, 0, paint);
//利用矩阵Matrix实现上面的效果
//Matrix mx = new Matrix();
//mx.postRotate(30,bmp.getWidth()/2,bmp.getHeight()/2);
//canvas.drawBitmap(bmp, mx, paint);
//----平移位图
//canvas.save();
//canvas.translate(20, 20);
//canvas.drawBitmap(bmp, 0, 0, paint);
//canvas.restore();
//----利用矩阵对位图平移
//Matrix maT = new Matrix();
//maT.postTranslate(20,20);
//canvas.drawBitmap(bmp, maT, paint);
//----缩放位图
//canvas.save();
//canvas.scale(2f, 2f, 50 + bmp.getWidth()/2,
//	50 + bmp.getHeight()/2);
//canvas.drawBitmap(bmp, 50, 50, paint);
//canvas.restore();
//canvas.drawBitmap(bmp,50,50,paint);
//----利用矩阵对位图进行缩放
//Matrix maS = new Matrix();
//maS.postTranslate(50, 50);
//maS.postScale(2f, 2f, 50 + bmp.getWidth()/2, bmp.getHeight()/2);
//canvas.drawBitmap(bmp, maS, paint);
//canvas.drawBitmap(bmp, 50, 50, paint);
/*X轴镜像
canvas.save();
canvas.scale(-1, 1, bmp.getWidth()/2, bmp.getHeight()/2);
canvas.drawBitmap(bmp, 0,0, paint);
canvas.restore();
canvas.drawBitmap(bmp, 100, 100, paint);
*/
/*Y轴镜像
canvas.save();
canvas.scale(1, -1, bmp.getWidth()/2, bmp.getHeight()/2);
canvas.drawBitmap(bmp, 0, 0, paint);
canvas.restore();
canvas.drawBitmap(bmp, 100,100, paint);
*/
}
} catch (Exception e){

} finally{
if(canvas !=null)
sfh.unlockCanvasAndPost(canvas);
}
}

/**
* 按键事件监听
*
*/
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
return super.onKeyDown(keyCode, event);

}
/**
* 触屏事件监听
*
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
return true;
}
/**
* 游戏逻辑
*
*/
private void logic(){

}
/**
*运行线程
*
*/
@Override
public void run() {
// TODO Auto-generated method stub
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视图状态发生变化，响应此函数
*/
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub

}
/**
* SurfaceView视图状态消亡时，响应此函数
*/
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
flag = false;
}

}