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Normal Topic Centered Zoom (Read 2645 times)
jsamba
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Centered Zoom
Aug 17th, 2007 at 2:05pm
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I want the user to be allowed to zoom using a slider control, the mousewheel or double-clicking inside the diagram.

I use ZoomFactor to perform the zoom/unzoom responding to an event BUT it is the upper left corner of the visible rect which is invariant and I want it to be the CENTER of the visible rect.

I could do it knowing the coordinates of the visible rectangle.
I did not find a way to get the visible rect coordinates. I can reach to the left and top coord with ScrollY and ScrollY, that's all ... ???
  
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Stoyo
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Re: Centered Zoom
Reply #1 - Aug 18th, 2007 at 10:14am
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If you know the size of the flowchart control in pixels, use the ClientPtToDocPt method to find the document coordinates of the lower-right corner.

Stoyan
  
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jsamba
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Re: Centered Zoom
Reply #2 - Aug 18th, 2007 at 2:09pm
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Thank you Stoyan; I actually found a piece of code from you that does the work at

http://mindfusion.org/cgi/Forum/YaBB.pl?board=fcx_disc;action=display;num=115192...
  
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jsamba
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Re: Centered Zoom
Reply #3 - Aug 18th, 2007 at 2:11pm
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... but it would be great to have it implemented as it is very useful

Something like the Scale, scaleX and ScaleY, scaleWidth ... fct et prop from VB  Wink
  
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