Android反向剪辑 [英] Android inverse clip

问题描述

我需要指定一个不能在其中绘制Android画布的矩形.我知道clipRect将指定绘制区域和绘制区域，但是我想是否可以扭转这种影响.换句话说，如何绘制对象使其绘制到矩形的外部.图片说明:

I need to specify a rectangle in which the Android canvas CANNOT draw inside of. I know that clipRect will specify and area in which to draw in, but I was if I could reverse this effect. In other words how do I draw an object making it draw to the outside of a rectangle. Image for clarification:

推荐答案

我不确定这是否真的比透支要好.但是您可以将剪切路径设置为全视图，然后将第二个剪切路径设置为具有Region.Op DIFFERENCE的排除区域.这样会将裁剪矩形设置为两者之间的差异.

I'm not sure if this is actually going to be more performant than doing an overdraw. But you could set a clipping path to the full view, then set a second one to the exclusion zone with Region.Op DIFFERENCE set. That would set the clipping rect to the difference between the two.

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