android游戏开发学习笔记二（学习书籍 Android游戏编程之从零开始）

/**
* 画布
*
* @author 岳振华
*
*/
@SuppressWarnings("unused")
public class CanvasSrufaceView extends SurfaceView implements Callback, Runnable {
private SurfaceHolder sfh;
private Thread thread;
private int surfaceW, surfaceH;
private Paint paint;
private Canvas canvas;
private PaintFlagsDrawFilter drawFilter=new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);


public CanvasSrufaceView(Context context) {
super(context);


/********** 画图所必需 *********************/
sfh = this.getHolder();// 获得surfaceHolder对象
sfh.addCallback(this);


thread = new Thread(this);


paint = new Paint();// 新建画笔
paint.setColor(Color.RED);// 设置画笔颜色
paint.setAntiAlias(true);// 消除锯齿


this.setKeepScreenOn(true);// 保持屏幕常亮
this.setFocusable(true);
/********************************************/


}


/**
* 开始动画
*/
@Override
public void startAnimation(Animation animation) {
super.startAnimation(animation);
}


/**************************** callback的几个方法 ********************/


/**
* 当Surface第一次创建后会立即调用该函数 一般情况下都是在另外的线程来绘制界面，所以不要在这个函数中绘制Surface
*/
@Override
public void surfaceCreated(SurfaceHolder holder) {
surfaceW = this.getWidth();
surfaceH = this.getHeight();
thread = new Thread(this);


thread.start();// 开启线程


}


/**
* 当Surface的状态（大小和格式）发生变化的时候会调用 该函数 在surfaceCreated调用后该函数至少会被调用一次
*/
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {


}


@Override
public void surfaceDestroyed(SurfaceHolder holder) {


}


/**************************** callback的几个方法 ********************/


/**
* 绘图方法
*/
private void draw() {
try {
// 获得canvas实例
canvas = sfh.lockCanvas();
if (canvas != null) {
//paint =new Paint();
//paint.setAntiAlias(true);
// 消除锯齿
canvas.setDrawFilter(drawFilter);
// 利用填充画布,刷屏
canvas.drawColor(Color.BLACK);
//绘制文本
canvas.drawText("岳振华", 50, 50, paint);
//绘制象素点
canvas.drawPoint(10, 20,paint);
//绘制多个象素点(同一直线上的)
canvas.drawPoints(new float[]{10,30,30,30}, paint);
//绘制直线
canvas.drawLine(20, 40, 40, 40, paint);
//绘制多条直线
canvas.drawLines(new float[]{20,50,40,50,20,60,40,60}, paint);
//方法一：绘制矩形
canvas.drawRect(30, 60, 60, 90, paint);
//方法二：绘制矩开
Rect rect=new Rect(70, 60, 100, 100);
canvas.drawRect(rect, paint);

//绘制圆角矩形
RectF rectF=new RectF(30, 100, 60, 150);
canvas.drawRoundRect(rectF, 2, 2, paint);
//绘制圆形
canvas.drawCircle(100, 200, 10, paint);
//绘制弧形
canvas.drawArc(new RectF(150, // 第一个和第三个参数表半径
20,//
160, // 第二个参数表弧度
70), //
0, 180, true, paint);

//绘制椭圆
canvas.drawOval(new RectF(200,50,260,70), paint);


//绘制指定路径的图形(多边形)
Path path=new Path();
//设置路径起点
path.moveTo(160, 150);
//路线1
path.lineTo(200, 150);
//路线2
path.lineTo(180, 200);
//路线3
path.lineTo(160, 180);
//路径结束
path.close();
canvas.drawPath(path, paint);

}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (null != canvas) {
sfh.unlockCanvasAndPost(canvas);// 提交画布
}
}
}


@SuppressWarnings("static-access")
@Override
public void run() {
// 绘图
draw();
try {
thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}


}
}