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Normal Topic GetItemAt when diagram is zoomed (Read 2472 times)
dolfandon
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GetItemAt when diagram is zoomed
Mar 1st, 2011 at 9:31pm
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I seem to be having an issue getting the object that is clicked on when the diagram is zoomed. This is to pop up a context menu and select the item under the mouse when a user right clicks in the diagram. The following code works fine when not zoomed but does not work if the zoom factor is set to anything other than 100. Is this correct or is there another way?

[code] Double xPos = ((pastePoint.X + xScroll) * (currentDiagram.ZoomFactor / 100)) - xDiagOffset;
Double yPos = ((pastePoint.Y + yScroll) * (currentDiagram.ZoomFactor / 100)) - yDiagOffset;
Point checkPoint = new Point(xPos, yPos);

DiagramItem clickedItem = currentDiagram.GetItemAt(checkPoint, false, true);[/code]

TIA

Don
  
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Stoyo
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Re: GetItemAt when diagram is zoomed
Reply #1 - Mar 1st, 2011 at 10:33pm
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If you have the pastePoint value relative to some Silverlight element, call element.TransformToVisual(diagram.DocumentPlane).Transform(pastePoint) to get the respective diagram coordinates.

I hope that helps,
Stoyan
  
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dolfandon
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Re: GetItemAt when diagram is zoomed
Reply #2 - Mar 2nd, 2011 at 2:09pm
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Can I call this on the diagram? The point I have is relative to the Silverlight application and not the diagram.
  
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Stoyo
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Re: GetItemAt when diagram is zoomed
Reply #3 - Mar 2nd, 2011 at 2:33pm
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Try calling it on the Application.Current.RootVisual object.
  
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dolfandon
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Re: GetItemAt when diagram is zoomed
Reply #4 - Mar 3rd, 2011 at 8:50pm
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Thanks Stoyo. That does work. Smiley
  
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