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Normal Topic Crash with beziers (Read 5265 times)
marie
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Crash with beziers
Jun 23rd, 2009 at 12:33pm
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Hi,

I get the following crash when drawing a selection rectangle around nodes and links:
IndexOutOfRangeExectpion
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"   à MindFusion.Utilities.ApproxBezier(PointF[] points, Int32 startIdx, Int32 quality)
   à MindFusion.Diagramming.DiagramLink.x506928df783c0c72(Int32 x949108ddd7122fd3)
   à MindFusion.Diagramming.DiagramLink.xa170bf38e993d468(RectangleF x26545669838eb36e)
   à MindFusion.Diagramming.Diagram.x98d300fb770bf5ec(RectangleF x26545669838eb36e, Boolean x201ab38fe5644146)
   à MindFusion.Diagramming.Selection.AllowCreate(PointF current, InteractionState ist)
   à MindFusion.Diagramming.InteractionState.ValidateAndSetCursor(PointF point, Diagram diagram)
   à MindFusion.Diagramming.WinForms.DiagramView.OnMouseMove(MouseEventArgs e)


I using version 5.2.0 I think (Runtime version of my dlls: v2.0.50727) (.Net 2.0 version of the dlls but using .Net 3.5).

Thanks,
Marie
« Last Edit: Jun 23rd, 2009 at 2:28pm by marie »  
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Stoyo
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Re: Crash with beziers
Reply #1 - Jun 23rd, 2009 at 1:11pm
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Hi,

Bezier links should have SegmentCount * 3 + 1 control points. You will get that exception if you add or remove some points and that constraint is violated.

Stoyan
  
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marie
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Re: Crash with beziers
Reply #2 - Jun 23rd, 2009 at 1:23pm
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Hi,

I don't play with Diagram.LinkSegments nor with link.SegmentCount and I always have beziers with 4 control points. My links are all drawn perfectly well. I can move nodes around (I added an event to redraw them when SelectionMoving & NodeModified). The problem occured for some reason when I select more than 1 node. Since I can't catch the exception, I still think it shouldn't throw it or that it should also be thrown when I set my control points.

Nevertheless, by changing Diagram.LinkSegments back to 1 (actually I just removed the initialization I had), the crash is gone Grin. I now respect the SegmentCount * 3 + 1 rule.

Thanks,
Marie
  
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Stoyo
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Re: Crash with beziers
Reply #3 - Jun 23rd, 2009 at 1:30pm
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Hi,

If SegmentCount is more than 1 while there are 4 control points you will get the exception. After setting ControlPoints, call the UpdateFromPoints(updateSegmentCoint) overloaded method to keep the segmentCount field in sync with the control points collection size.

Stoyan
  
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marie
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Re: Crash with beziers
Reply #4 - Jun 23rd, 2009 at 1:39pm
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Hi,

Quote:
If SegmentCount is more than 1 while there are 4 control points you will get the exception.
I'm not playing with segments counts at all anymore. Therefore, since by default it is initialized to 1, it should always be 1 (I don't change it), unless your code changes it by itself. However, I just encountered the crash again Sad, but in different circumstances (moving a container weirdly moved some of its contained nodes outside of it (but they still belonged to the container). After that, I tried to select those nodes and BOOM.

I don't have your method UpdateFromPoints(updateSegmentCount) since I'm using an earlier version (waiting for the new 5.3 version).

Thanks,
Marie
  
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Stoyo
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Re: Crash with beziers
Reply #5 - Jun 23rd, 2009 at 3:03pm
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Could you copy your LinkCreating code here?
  
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marie
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Re: Crash with beziers
Reply #6 - Jun 23rd, 2009 at 3:33pm
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Hi Stoyan,

I just sent it to you by email.

Thanks!
Marie
  
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