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POExporting a transparent TChart PNG distorts text
 

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  1. POExporting a transparent TChart PNG distorts text
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    <p>I'm using Steema TeeChart v4.1.2010.11303. I want to export a chart to a PNG image with a <strong>transparent background</strong>.</p> <p>The resulting image has <strong>"distorted" or bold text</strong> in the left and bottom axis and in the header. It looks like being rendered with a raster font with a too low resolution. The legend on the right on the other hand looks fine:</p> <p><img src="https://i.imgur.com/gziZo.png?1" alt="TeeChart with distorted text"></p> <p>The following sample code can be used to reproduce the problem: </p> <pre><code>TChart tChart = new TChart(); tChart.Aspect.View3D = false; tChart.Panel.Brush.Gradient.Visible = false; // Make the background of the chart transparent. tChart.Panel.Transparent = true; Steema.TeeChart.Styles.Bar series1 = new Steema.TeeChart.Styles.Bar( tChart.Chart ); series1.FillSampleValues(); tChart.Draw(); tChart.Graphics3D.BufferStyle = Steema.TeeChart.Drawing.BufferStyle.None; using ( System.IO.Stream stream = new System.IO.MemoryStream() ) { tChart.Export.Image.PNG.Width = m_PictureBox.Width; tChart.Export.Image.PNG.Height = m_PictureBox.Height; tChart.Export.Image.PNG.Save( stream ); // Show the bitmap in a Windows Forms PictureBox. // Alternatively, it can also be saved in a file, which makes no difference. PictureBox.Image = new Bitmap( stream ); } </code></pre> <p>When switching off the transparency with <code>tChart.Panel.Transparent = false;</code>, all text looks fine. However, I need a transparent background.</p> <p>Is this a bug in TeeChart or am I missing something?</p>
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