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POAnti-Aliased Text in a Transparent .NET Form
 

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    <p>I have a C# application which shows the current time in a transparent .NET Form. The Form has no controls and no border. Its property TransparencyKey is set to the Form's background color "light gray" to make it transparent.<br> So the user can only see the text (current time).</p> <p>The text is drawn in the PaintEventHandler:</p> <pre><code>private void Display_Paint( object sender, PaintEventArgs e ) { Graphics formGraphics = e.Graphics; Font myFont = new Font( "Microsoft Sans Serif", 24, FontStyle.Bold ); formGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; //formGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixel; formGraphics.DrawString( "00:00:00", myFont, Brushes.Green, 0.0F, 0.0F ); myFont.Dispose(); } </code></pre> <p>Due to the anti-aliasing the text "00:00:00" is shown frayed when the Form is over a dark background. For light backgrounds the text is o.k.</p> <p>This image shows the problem and the good case:</p> <p><a href="http://www.habermann-net.de/public/development/antiAliasing_bad.png">text shows fringes due to anti-aliasing for dark background http://www.habermann-net.de/public/development/antiAliasing_bad.png</a></p> <p>Obviously Windows does render the text in a way that it fits to the Form's own background color and not in a way that it fits to the background which is behind the transparent Form.</p> <p>Is it possible to let Windows take the background behind the Form into account when rendering the text so that I get rid of the fringes? </p> <p>One "solution" could be to switch off anti-aliasing by setting TextRenderingHint accordingly. But up to now this is not my preferred "solution".</p> <p>System:<br> Windows XP, SP 3, .NET 3.5, VS 2008</p>
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