CRgn ScreenToClient

问题描述

我有几个自定义绘制的CStatic，它们使用SetWindowRgn为其赋予每个不规则(非矩形)形状.我需要使每个控件OnEraseBkgnd后面的区域无效，为此，我想在父级CDialog上使用CWnd::InvalidateRgn，但是我需要将CRgn转换为父级的坐标.我想要类似Cwnd::ScreenToClient(CRgn *)的东西，但据我所知，不存在这样的东西.

I have several Custom Drawn CStatic which use SetWindowRgn to give each of them an irregular (non-rectangular) shape. I need to Invalidate a the region behind each of these Controls OnEraseBkgnd, for which I would like to use CWnd::InvalidateRgn on the parent CDialog however I need to translate the CRgn into the coordinates of the parent. I would like to have something like Cwnd::ScreenToClient(CRgn *) but as far as I can see no such thing exists.

我如何获得等价于CWnd::ScreenToClient的CRgn?

How do I get the equivalent of CWnd::ScreenToClient that takes a CRgn?

推荐答案

• 使用将CRgn区域拆分为矩形GetRegionData
• ScreenToClient单个矩形
• 使用CreateFromData
将输出组合回区域
• Split CRgn region into rectangles using GetRegionData
• ScreenToClient individual rectangles
• Combine the output back into region using CreateFromData

替代选项是 CRgn::OffsetRgn 使用从ScreenToClient获得的单个点的距离来干扰该区域.

An alternate option is CRgn::OffsetRgn to offet the region using the distance obtained from ScreenToClient for an individual point.

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