android camera 画角度图

package com.cardroid.layer;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Camera;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.view.MotionEvent;
import android.view.View;

public class CameraDraw extends View {

private Context context ;
private Bitmap showBmp ;
private Matrix matrix ; //作用矩阵
private Camera camera ;
private int deltaX , deltaY ; //翻转角度差值
private int centerX , centerY ; //图片中心点

public CameraDraw(Context context) {
super(context);
this.context = context ;
initData();
}

private void initData(){
showBmp = BitmapFactory.decodeResource(context.getResources(), R.drawable.bg);
centerX = showBmp.getWidth()/2 ;
centerY = showBmp.getHeight()/2 ;
matrix = new Matrix();
camera = new Camera();
}

int lastMouseX ;
int lastMouseY ;
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
switch(event.getAction()) {
case MotionEvent.ACTION_DOWN:
lastMouseX = x ;
lastMouseY = y ;
break;
case MotionEvent.ACTION_MOVE:
int dx = x - lastMouseX ;
int dy = y - lastMouseY ;
deltaX += dx ;
deltaY += dy ;
break;
}

invalidate();
return true;
}

@Override
protected void onDraw(Canvas canvas) {

camera.save();
//绕X轴翻转
camera.rotateX(-deltaY);
//绕Y轴翻转
camera.rotateY(deltaX);
//设置camera作用矩阵

camera.getMatrix(matrix);
camera.restore(); //主要是得到翻转矩阵大小
//设置翻转中心点
matrix.preTranslate(-this.centerX, -this.centerY);
matrix.postTranslate(this.centerX, this.centerY);

canvas.drawBitmap(showBmp, matrix, null);
}

}

public class LayerDraw extends Activity {
/** Called when the activity is first created. */
private ImageView mImageView;
private TextView tView;
private CameraDraw carmeraCameraDraw;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
carmeraCameraDraw=new CameraDraw(this);
//setContentView(R.layout.main);
setContentView(carmeraCameraDraw);
// mImageView=(ImageView)findViewById(R.id.image);
// tView=(TextView)findViewById(R.id.tv);
// setImage();
}

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