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POC# GraphicsPath drawing issues
 

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  1. POC# GraphicsPath drawing issues
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    <p>I am trying to draw a GraphicsPath in my program, but it seems to have issues where it adds random spikes to the path. This seems to get worse the wider the path is. I have made some test code which can replicate this problem.</p> <p>This code required a form with a PictureBox in it (PictureBox dimensions at least 630 x 1050), and a single button. The code is then as follows:</p> <pre><code> private void button1_Click(object sender, EventArgs e) { drawSomeLines(); pictureBox1.Refresh(); } private void drawSomeLines() { //initialise the plot area: Bitmap image = new Bitmap(pictureBox1.Width, pictureBox1.Height); pictureBox1.BackgroundImage = image; Graphics g = Graphics.FromImage(image); //create a graphics path: GraphicsPath gPath = new GraphicsPath(); //add sections to the path: gPath.AddLine(587.310059F, 29.2261658F, 229.974731F, 668.2402F); gPath.AddArc(new RectangleF(203.177338F,560.3876F,421.357F,421.357F), -(90 - 299.21382700000413F), -1.532426F); gPath.AddArc(new RectangleF(203.177368F,560.3876F,421.357F,421.357F), -(90 - 297.72672132554612F), -1.53240252F); gPath.AddLine(224.740067F,678.2186F, 76.6899643F,979.773865F); //draw the path 3 times, at different widths: g.DrawPath(new Pen(new SolidBrush(Color.FromArgb(100, Color.Blue)), 80), gPath); g.DrawPath(new Pen(new SolidBrush(Color.Blue), 40), gPath); g.DrawPath(new Pen(new SolidBrush(Color.Red), 2), gPath); } </code></pre> <p>I have drawn the path here 3 times at different widths, which shows how the problem gets worse at larger widths.</p> <p>Does anyone know why this happens, and how I might prevent it? Any ideas would be much appreciated.</p> <p>Cheers,</p> <p>Greg</p>
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    1. COThe dots do not connect. The discontinuity is clearly visible with a line thickness of 3.
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    2. COI don't see this. Surely the have to connect anyway as they are all added to the GraphicsPath. For example, even if I added 2 different lines that were miles apart and then drew the path, it would still connect them.
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