<div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div bgcolor="#ffffff" text="#000000"><blockquote type="cite"><div class="gmail_quote"><div class="im">
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">DearAll,<br>
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I plan to evaluate VTK for graph visualization and I wonder
whether it provides the features listed below.<br>
For some features, I already found information online.<br>
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</div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">
- modifying the edge thickness/width according to some edge
weight (???)<br>
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<div>Not currently possible. To stress certain edges I normally
use a color map for edges that changes their opacity based on
the weight.</div>
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Using the opacity is also a good idea. However, I just discovered
the vtkGraphToPolyData class which should provide access to the edge
geometry. Maybe, by using, e.g., vtkRibbonFilter, I will be able to
change the edge width? I wonder how this would influence the edge
picking in the view.<br></div></blockquote><div><br></div><div>Absolutely. If you want to use the lower-level filters like vtkGraphToPolyData, all sorts of other opportunities open up. Ribbons or tubes could be used to change the width based on a metric. But you are correct that then you don't get picking for free like you do in vtkGraphLayoutView. As long as you have a cell or point data array that indicates which edge the geometry came from, you should be able to use the picker classes in VTK without too much trouble.</div>
<div><br></div><div>Jeff</div></div>