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PODashed rectangles appear solid when expanding Winform window
 

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    <p>I'm experiencing an issue with GDI+ while custom painting dashed rectangles. </p> <p>The vertical portion of dashed rectangles appear as solid, continuous lines when the window size is increased or when scrolling up/down. Moving the mouse faster results in fewer and fewer solid sections. Curiously the horizontal lines do not exhibit this behaviour and appear as expected. </p> <p>So far two non-optimal solutions have been to set <code>ResizeRedraw = true</code> or to call <code>Invalidate()</code> during <code>OnResize()</code> and <code>OnScroll()</code>. I'd of course like to avoid this as what I am really drawing is more complex and these slow calls destroy the fluid experience. I've also tried invalidating only the newly shown area to no avail - only a full Invalidate seems to work.</p> <p>Any pointers on how to work this out?</p> <p>Demo code:</p> <pre><code>using System.Drawing; using System.Drawing.Drawing2D; using System.Windows.Forms; public class Form1 : Form { static void Main() { Application.Run(new Form1()); } public Form1() { this.ClientSize = new System.Drawing.Size(472, 349); DoubleBuffered = true; //ResizeRedraw = true; } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); int dimensions = 70; using ( Pen pen = new Pen(Color.Gray) ) { pen.DashStyle = DashStyle.Dash; for ( int x = 0; x &lt; 20; ++x ) { for ( int y = 0; y &lt; 20; ++y ) { Rectangle rect = new Rectangle(x * dimensions, y * dimensions, dimensions, dimensions); e.Graphics.DrawRectangle(pen, rect); } } } } } </code></pre>
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    1. USKevin Pullin
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