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integragreg
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DiagramLite ZoomToRect()
Sep 10th, 2009 at 12:50pm
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Stoyan,

Could you possibly post some code that shows how one would implement a ZoomToRect() method in DiagramLite? We want it to work the same way it does in WpfDiagram.

Thanks,

Greg
« Last Edit: Sep 10th, 2009 at 4:03pm by integragreg »  
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Stoyo
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Re: DiagramLite ZoomToRect()
Reply #1 - Sep 11th, 2009 at 6:03am
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This version adds the Diagram.ZoomToRect method:
https://mindfusion.eu/_beta/diaglite_zoomtorect.zip

I hope that helps,
Stoyan
  
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integragreg
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Re: DiagramLite ZoomToRect()
Reply #2 - Sep 11th, 2009 at 3:01pm
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Thanks for the quick response.

The zoom to rect feature works. But now, if we change the diagram behavior to "Modify" it does not show a selection rectangle and the following exception is thrown:

"Unhandled Error in Silverlight 2 Application Object reference not set to an instance of an object. at MindFusion.Diagramming.Silverlight.Selection.UpdateDrag(InteractionState ist)"...

The exception message seems odd to me because it says it's a Silverlight 2 application, and we're using Silverlight 3.
  
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integragreg
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Re: DiagramLite ZoomToRect()
Reply #3 - Sep 11th, 2009 at 4:55pm
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Another issue worth noting is that if we zoom to rect and then zoom to rect again, it doesn't work correctly the second time. I assume this is because the current zoom factor is no longer 100.0, and we are building the rect from the mouse coordinates like so:

Code
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protected override void OnMouseLeftButtonUp(System.Windows.Input.MouseButtonEventArgs e)


{



base.OnMouseLeftButtonUp(e);






if(Keyboard.Modifiers == ModifierKeys.Control)



{




dragEnd = e.GetPosition(this);




Rect sel = new Rect(dragStart, dragEnd);




ZoomToRect(sel);



}


}
  
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Stoyo
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Re: DiagramLite ZoomToRect()
Reply #4 - Sep 13th, 2009 at 1:00pm
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This version should fix the selection rectangle problem:
https://mindfusion.eu/_beta/diaglite_modifyfix.zip

I hope that helps,
Stoyan
  
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Re: DiagramLite ZoomToRect()
Reply #5 - Sep 13th, 2009 at 1:07pm
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Regarding the mouse position issue, try setting dragStart and dragEnd to e.GetPosition(diagram.DocumentPlane).

I hope that helps,
Stoyan
  
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