Mac OS X可可，在全局屏幕坐标空间中翻转Y坐标 [英] Mac OS X Cocoa, Flipping Y Coordinate in Global Screen Coordinate Space

问题描述

如何将NSPoint的y值翻转到翻转的坐标空间.

How do I flip the y value of an NSPoint to a flipped coordinate space.

我有两个点的来源，都在全局屏幕空间中，但是其中一个被翻转了:

I have two sources of points, both in global screen space, but one is flipped:

1. 一个屏幕坐标空间为0，0 =左上角.

1. one from a screen coordinate space with 0,0 = top left.

一个屏幕坐标空间为0，0 =左下角.

one from a screen coordinate space with 0,0 = bottom left.

我需要将第二个(左下)翻转到与第一个(左上)相同的空间.如何在NSPoint或CGPoint上做到这一点?

I need to flip the second one (bottom left) to be in the same space as the first one, top left. How can I do that on an NSPoint or CGPoint?

推荐答案

对于Mac OSX Cocoa，您可以翻转视图的 y 坐标，只需将 isFlipped 覆盖为为每个视图返回 YES :

For Mac OSX Cocoa, you can flip the y Coordinate for a view, just override isFlipped to return YES for each view:

- (BOOL)isFlipped {
    return YES;
}

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