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Normal Topic DrawNode event and overview window (Read 1108 times)
j poz
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DrawNode event and overview window
Feb 28th, 2013 at 11:21pm
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Is it possible to determine, inside of the DrawNode event, if the node is being drawn for an Overview window or a Diagram?

The problem is that we do not want to do all of the rendering we do on the Diagram inside of the Overview, for every visible node, because of speed issues on large diagrams.
  
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Stoyo
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Re: DrawNode event and overview window
Reply #1 - Mar 1st, 2013 at 8:24am
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It seems we should add a RenderOptions argument to DrawEventArgs to let you access overview's detail properties, such as DrawText and DrawImages. For the time being you could check the scale of current graphics transform, but it will also apply when drawing inside a DiagramView that has been zoomed out a lot:

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private void diagram_DrawNode(object sender, DrawNodeEventArgs e)
{
	var measure = new SizeF(1, 1);
	measure = Utilities.DocToDeviceF(e.Graphics, measure);
	var scale = measure.Width;
	if (scale > 0.2)
		e.Graphics.FillRectangle(Brushes.Red, e.Bounds);
}


I hope that helps,
Stoyan
  
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