Drawing curves for a line and bezier curve - Diagramming Components

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Drawing curves for a line and bezier curve (Read 2320 times)

kwinovich YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 2 Joined: Mar 24^th, 2008	Drawing curves for a line and bezier curve Mar 24^th, 2008 at 3:54pm	Print Post
	I am using FlowChart.net. I want to draw a line with curves on it. I also need to draw a bezier curve with curves instead of a line. Here is a sample of what I need: http://img96.imageshack.us/img96/238/arcdraw5sv.jpg The user should be able to move the arrow/curve end point and have the curves draw themselves as shown in the graphic. Also, the user should be able to size a bezier curve and have the curves that makeup the bezier draw themselves too. How can I go about this using the FlowChart.net component? I need this to expand as the user draws the line by dragging the mouse. I understand I can override draw methods but I havent been able to get that working. How can I go about getting the points on the line to actually draw the arcs? Thanks for any help!


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Drawing curves for a line and bezier curve Reply #1 - Mar 24^th, 2008 at 6:20pm	Print Post
	This works for straight-line links: Code private void diagram_DrawArrow(object sender, DrawLinkEventArgs e) { if (e.Shadow) return; for (int i = 0; i < e.Link.SegmentCount; ++i) { PointF a = e.Points[i]; PointF b = e.Points[i + 1]; float angle = 0, r = 0; Convert.DekartToPolar(a, b, ref angle, ref r); int c = (int)(r/3) + 1; if (c < 2) continue; PointF[] points = new PointF[c]; for (int j = 0; j < c; ++j) points[j] = new PointF(j * 3, (j % 2) == 0 ? -1 : 1); GraphicsState gs = e.Graphics.Save(); e.Graphics.TranslateTransform(a.X, a.Y); e.Graphics.RotateTransform(-angle); e.Graphics.DrawCurve(Pens.Black, points); e.Graphics.Restore(gs); } } Copy the Convert class from the CustomDraw sample. You might use the same code for Beziers too by approximating them with straight lines, but there'll be some more complex calculations involved in order to have smooth joins between the segments. Stoyan


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Drawing curves for a line and bezier curve Reply #2 - Mar 24^th, 2008 at 6:23pm	Print Post
	That was a handler for the DrawLink event - you can paste it over the same-named method in the CustomDraw sample to check how it works.


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