使用NSBezierPath addClip-如何反转剪辑 [英] Using NSBezierPath addClip - How to invert clip

问题描述

使用NSBezierPath addClip仅将绘图限制在用于剪切的路径内.我想做相反的事情-只能在外面画.

Using NSBezierPath addClip only limits drawing to inside the path used for clipping. I'd like to do the opposite - Only draw outside.

- (void)drawRect:(NSRect)dirtyRect {
    NSBezierPath *dontDrawInThis = ...;

    //We want an opposite mask of [dontDrawInThis setClip];

    //Drawing comes here
}

推荐答案

这是我的解决方案:

- (void)drawRect:(NSRect)dirtyRect {
    NSBezierPath *dontDrawInThis = ...;

    // The mask is the whole bounds rect, subtracted dontDrawInThis

    NSBezierPath *clip = [NSBezierPath bezierPathWithRect:self.bounds];
    [clip appendBezierPath:dontDrawInThis.bezierPathByReversingPath];
    [clip setClip];

    //Drawing comes here
}

对于iOS，将NSRect替换为CGRect.

For iOS replace NSRect with CGRect.

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