Android Canvas.scale（）而非四舍五入

Question

I'm scaling some bitmaps in canvas and I have some problems. I have this image 640x360 and want to fill it to the screen. My screen is 1196x720px so I have to scale the image by 1.86875 x 2.0 times.

The code is this:

canvas.save(Canvas.MATRIX_SAVE_FLAG);
canvas.scale((float)(1.86875), (float)(2.0),0,0);
canvas.drawBitmap(this.backgroundMap, 0, 0, null);
canvas.restore();

The image is scaling correctly in axis Y but it's wrong of, I think 100 pixels in X axis. Any idea on how I can resolve this?

thank you =)

Answer 1

Instead of using scale and drawBitmap try using this method:

canvas.drawBitmap(bitmap, src, dst, paint);

You probably should call it this way:

canvas.drawBitmap(this.backgroundMap, null, new Rect(0, 0, 1196, 720), null);