如果我有一个画布，上，我画一个位图是这样的：

If I have a canvas, on which I draw a Bitmap like this:

canvas.drawBitmap(bmLargeImage, srcRect, destRect, paint);

和我缩放位图：

canvas.scale(1.5f, 1.5f, 450, 250);

我想获得规模后，位图的位置。如果规模前的位置为（0，0），规模之后有一个偏移和我需要的补偿。我怎样才能得到它呢？

I want to get the position of the Bitmap after the scale. If the position before scale was (0, 0), after scale there is a offset and I need that offset.. how can I get it?

感谢和抱歉简单的问题，新手在这里...

Thanks and sorry for the simple question, newbie here...

推荐答案

确定可以尝试制定出最佳配方为这个

Ok lets try to work out the best formula for this

canvas.scale(scaleX, scaleY, pivotX, pivotY);  

if (scaleX >= 1){    
  objectNewX = objectOldX + (objectOldX - pivotX)*(scaleX - 1); 
}else{   
  objectNewX = objectOldX - (objectOldX - pivotX)*(1 - scaleX); 
}

同为objectNewY。当然，位图的新高度和宽度将原来的大小和规模的多。

The same for objectNewY. The new width and height of the bitmap would of course be the multiple of the old size and scale.