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Normal Topic DiagramLink Draw() Pen flicker (Read 2103 times)
j poz
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DiagramLink Draw() Pen flicker
Aug 11th, 2014 at 3:23pm
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I am overriding the Draw() method of DiagramLink, and doing something like this:

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public override void Draw(MindFusion.Drawing.IGraphics graphics, RenderOptions options)
{
             if (DragOver)
            {
                Pen = YellowPen;
                HeadPen = YellowPen;
            }
            else
            {
                Pen = BlackPen;
                HeadPen = BlackPen;
            }

             base.Draw(graphics, options);
}


The problem is that when DragOver is true, the link is being drawn in yellow but flickering between black and yellow as I drag over it.

How do I stop it from flickering like this?
  
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Stoyo
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Re: DiagramLink Draw() Pen flicker
Reply #1 - Aug 12th, 2014 at 2:19pm
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You might be seeing the black color from the view's bitmap buffer used for fast redrawing of stationary items during modification of the active item. Try calling the RecreateCacheImage method from each NodeModifying event if you set the DragOver flag while moving nodes, or better call it only when a link has to be redrawn because a node moves over / away from it.
  
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j poz
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Re: DiagramLink Draw() Pen flicker
Reply #2 - Aug 12th, 2014 at 4:48pm
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You're right, that was it. Thank you.
  
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