Draw polygon with innerRing.

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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#?

Posted 30-Jan-13 0:03am

gilvani

Updated 30-Jan-13 0:04am

v2

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gilvani · Accepted Answer · 2013-01-30T01:46:00

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.

C#

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 );

That's all folks!