public class MyView extends View { //图片的引用 Bitmap myBitmap; Paint paint; public MyView(Context context, AttributeSet attrs) { super(context, attrs); //调用初始化 initBitmap(); } //初始化图片 public void initBitmap(){ paint = new Paint(); myBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.img); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //打开抗锯齿 paint.setAntiAlias(true); paint.setColor(Color.WHITE); paint.setTextSize(15); //绘制图片 canvas.drawBitmap(myBitmap, 10, 10, paint); //保存画布状态 canvas.save(); //创建Matrix对象 Matrix m1 = new Matrix(); //平移矩阵 m1.setTranslate(500, 10); Matrix m2 = new Matrix(); //以一定角度旋转矩阵 m2.setRotate(15); Matrix m3 = new Matrix(); m3.setConcat(m1, m2); //缩放矩阵 m1.setScale(0.8f, 0.8f); m2.setConcat(m3, m1); //绘制图片 m2 canvas.drawBitmap(myBitmap, m2, paint); //恢复画布状态,取消所有Matrix canvas.restore(); canvas.save(); //设置透明度 paint.setAlpha(180); //平移矩阵 m1.setTranslate(200, 100); //缩放矩阵 m2.setScale(1.3f, 1.3f); m3.setConcat(m1, m2); //绘制图片 m3 canvas.drawBitmap(myBitmap, m3, paint); //恢复画笔设置 paint.reset(); canvas.restore(); paint.setTextSize(40); paint.setColor(0xffFFFFFF); canvas.drawText("图片的宽度:" + myBitmap.getWidth(), 20, 220, paint); canvas.drawText("图片的高度:" + myBitmap.getHeight(), 150, 220, paint); paint.reset(); } }
Matrix操作贴图
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转载自jameskaron.iteye.com/blog/2201939
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