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POHow to create a 'hole' in an image in vb.net
 

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  1. POHow to create a 'hole' in an image in vb.net
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    <p>I am trying to create a hole in my image using code, like this <a href="http://i1293.photobucket.com/albums/b595/electrogeekguy/fogofwardemo_zps6a6108c8.png" rel="nofollow">http://i1293.photobucket.com/albums/b595/electrogeekguy/fogofwardemo_zps6a6108c8.png</a></p> <p>so that when i draw my image you can see what is underneath through the hole.</p> <p>Below is my code that creates a gradient transparent at the middle out to solid black at the edges, but it blends my gradient with the underlying black.</p> <p>vb.net or c# code to help me would be fine.</p> <p>My plan is to remove a circle such as in my picture above and then apply the gradient.</p> <pre><code>Private Function FogOfWarUpdate() As Image Dim FogOfWarBitmap As Bitmap = New Bitmap(FogOfWarOldImage) Dim FogOfWarGraphics As Graphics = Graphics.FromImage(FogOfWarBitmap) Dim FogOfWarGraphicsPath As New System.Drawing.Drawing2D.GraphicsPath FogOfWarGraphicsPath.AddEllipse(2048, 1024, 500, 500) Dim FogOfWarPathGradientBrush As New System.Drawing.Drawing2D.PathGradientBrush(FogOfWarGraphicsPath) FogOfWarPathGradientBrush.CenterPoint = New PointF(2048 + 250, 1024 + 250) FogOfWarPathGradientBrush.CenterColor = Color.FromArgb(0, Color.Black) FogOfWarPathGradientBrush.SurroundColors = New Color() {Color.FromArgb(128, Color.Black)} FogOfWarGraphics.FillPath(FogOfWarPathGradientBrush, FogOfWarGraphicsPath) 'FogOfWarGraphics.DrawEllipse(Pens.BlueViolet, 100, 100, 200, 200) FogOfWarPathGradientBrush.Dispose() FogOfWarGraphicsPath.Dispose() FogOfWarGraphics.Dispose() Return FogOfWarBitmap End Function </code></pre>
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    1. USGraham
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    1. COUse the Graphics.Clip property
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      1. USHans Passant
    2. CO@HansPassant, I have looked at the clip properties, but from what I can gather it only handles rectangles. Could you provide a link to anything that would show how to clip ellipse regions? Thanks
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      1. POHow to create a 'hole' in an image in vb.net
      1. USGraham
    3. COyou should try overlays
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      1. USPrasad
 

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