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问题描述

在我看来,我有一个大的矩形,矩形可以移动。当矩形移动到某个地方,我想画的图像在大矩形的中心。我的问题是,我不能把图像的中心到矩形的中心。
我用:

In my view I have a big rectangle, the rectangle can move. When the rectangle moves to someplace, I want to draw image in the center of the big rectangle. My question is that I cannot put the center of the image to the center of the rectangle.I used:

 canvas.drawBitmap(rotatedBitmap, matrix, paint)
 canvas.drawBitmap(rotatedBitmap, left, top, paint)

但我不能找到canvas.drawBitmap(rotatedBitmap,的centerX,centerY,油漆),所以我想用矩阵,但矩阵也移动图像从左侧和顶部开始,而不是从中心,您可以提供一些线索绘制图片在矩形的中心?

but i cannot find canvas.drawBitmap(rotatedBitmap, centerX, centerY, paint), so I want to use matrix, but the matrix also moves image from the left and top start, not from center, can you give some clue to draw the pic in the center of the rectangle?

推荐答案

尝试使用矩形的边界作为参考点,然后使用类似:

Try using the bounds of the rectangle as a reference point, then use something like:

imageStartX =(rectStartX +(rectWidth / 2)) - (imageWidth / 2);

imageStartX = (rectStartX + (rectWidth/2)) - (imageWidth/2);

imageStartY =(rectStartY +(rectHeight / 2)) - (imageHeight / 2);

imageStartY = (rectStartY + (rectHeight/2)) - (imageHeight/2);

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09-05 15:21