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    <p>It appears that this is a known bug...</p> <p>The following code appears to function as you requested:</p> <pre><code>protected override void OnPaint(PaintEventArgs e) { PointF[] points = new PointF[] { new PointF(73.36f, 196), new PointF(75.44f, 32), new PointF(77.52f, 32), new PointF(79.6f, 196), new PointF(85.84f, 196) }; e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; Rectangle b = new Rectangle(70, 32, 20, 165); e.Graphics.SetClip(b); e.Graphics.DrawLines(Pens.Red, points); // clipped incorrectly e.Graphics.TranslateTransform(80, 0); e.Graphics.ResetClip(); e.Graphics.DrawLines(Pens.Red, points); } </code></pre> <p>Note: I have AntiAlias'ed the line and extended your clipping region by 1</p> <p>it appears that the following work arounds might help (although not tested):</p> <ul> <li>The pen is more than one pixel thick</li> <li>The line is perfectly horizontal or vertical</li> <li>The clipping is against the window boundaries rather than a clip rectangle</li> </ul> <p>The following is a list of articles that might / or then again might not help:</p> <p><a href="http://www.tech-archive.net/pdf/Archive/Development/microsoft.public.win32.programmer.gdi/2004-08/0350.pdf" rel="nofollow noreferrer">http://www.tech-archive.net/pdf/Archive/Development/microsoft.public.win32.programmer.gdi/2004-08/0350.pdf</a> <a href="http://www.tech-archive.net/Archive/Development/microsoft.public.win32.programmer.gdi/2004-08/0368.html" rel="nofollow noreferrer">http://www.tech-archive.net/Archive/Development/microsoft.public.win32.programmer.gdi/2004-08/0368.html</a></p> <p>OR...</p> <p>the following is also possible:</p> <pre><code>protected override void OnPaint ( PaintEventArgs e ) { PointF[] points = new PointF[] { new PointF(73.36f, 196), new PointF(75.44f, 32), new PointF(77.52f, 32), new PointF(79.6f, 196), new PointF(85.84f, 196) }; Rectangle b = new Rectangle( 70, 32, 20, 164 ); Region reg = new Region( b ); e.Graphics.SetClip( reg, System.Drawing.Drawing2D.CombineMode.Union); e.Graphics.DrawLines( Pens.Red, points ); // clipped incorrectly e.Graphics.TranslateTransform( 80, 0 ); e.Graphics.ResetClip(); e.Graphics.DrawLines( Pens.Red, points ); } </code></pre> <p>This effecivly clips using a region combined/unioned (I think) with the ClientRectangle of the canvas/Control. As the region is difned from the rectangle, the results should be what is expected. This code can be proven to work by adding</p> <pre><code>e.Graphics.FillRectangle( new SolidBrush( Color.Black ), b ); </code></pre> <p>after the setClip() call. This clearly shows the black rectangle only appearing in the clipped region.</p> <p>This could be a valid workaround if Anti-Aliasing the line is not an option.</p> <p>Hope this helps</p>
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