创建原图的副本

创建原图的副本

Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.tomcat);
        iv.setImageBitmap(bitmap);
        Bitmap bitmapC = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), bitmap.getConfig());
        Paint paint = new Paint();
        Canvas canvas = new Canvas(bitmapC);
        Matrix matrix = new Matrix();
        //设置Matrix进行缩放，sx,sy控制X,Y方向上的缩放比例；
        matrix.setScale(1.0f,-1.0f);
        //沿Y轴翻转
        matrix.postTranslate(0,bitmap.getHeight());
        canvas.drawBitmap(bitmap,matrix,paint);
        ivC.setImageBitmap(bitmapC);

 

• 通过matrix实现图形特殊效果 
  • 旋转 
  • 缩放 
  • 移动 
  • 镜面 
  • 倒影

        Matrix matrix = new Matrix();
        //设置Matrix进行缩放，sx,sy控制X,Y方向上的缩放比例；
        matrix.setScale(1.0f,-1.0f);
        //沿Y轴翻转
        matrix.postTranslate(0,bitmap.getHeight());

 

转载于:https://www.cnblogs.com/nangongyibin/p/10252592.html