使用innerRing绘制多边形。 [英] Draw polygon with innerRing.

问题描述

问题如下。



我有2个点数组。在图形中我需要绘制多边形（数组1）而不绘制内部（数组2），如此图像。



http://wiki.openstreetmap.org/w/images/thumb/b/b4/ Multipolygon_Illustration_1.svg / 400px-Multipolygon_Illustration_1.svg.png [ ^ ]



任何想法如何在C ＃？

The problem is the following.

I have 2 arrays of points. In a graphics I need to paint the polygon (array 1) without painting the inside (array 2), As this image.

http://wiki.openstreetmap.org/w/images/thumb/b/b4/Multipolygon_Illustration_1.svg/400px-Multipolygon_Illustration_1.svg.png[^]

Any idea how to do this in C#?

推荐答案

你好，我找到了解决办法。



在图形中我更改了 CompositingMode ，它确定何时在另一个上绘制多边形，它被覆盖而不是叠加。

hello, I found the solution.

In graphics I changed the CompositingMode that determines when to paint a polygon on the other it is overwritten and not superimposed.

Bitmap img = new Bitmap( 200, 200 );
Graphics imgGraph = Graphics.FromImage( img );
imgGraph.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;
imgGraph.FillPolygon( Brushes.Red, Points1 );
imgGraph.FillPolygon( Brushes.Transparent, Points2 );

这就是所有人！

That''s all folks!

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