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POCalling a function when canvas zooming is done
 

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  1. POCalling a function when canvas zooming is done
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    <p>I have a <code>UserControl</code> that contains a <code>Canvas</code>. The Canvas can be panned and zoomed in and out correctly. I also keep a small user control that shows the content of the big user control with a small rectangle that displays the user what he's currently looking at (The size / location of that rectangle is updated whenever the user pans / zooms on the main user control)</p> <p>All is working correctly except for one thing - When I zoom in or out using the mouse wheel, the location of the small reference rectangle is updated to the wrong location, and when I pan the canvas around it shows the correct location. I calculated the location of the reference rectangle by taking the 0, 0 point of the canvas in the main user control and converting it to point on the screen. Here's my code:</p> <pre><code>public Point GetTopLeftOffset() { Point topLeft = PointToScreen(new Point(0, 0)); return m_mainCanvas.PointFromScreen(topLeft); } </code></pre> <p>My idea was to call the above function when the zooming is actually done. My suspicion is that the code gets the top left offset while zooming is still performing - what causes the output to be wrong.</p> <p>If anyone can tell me why the value is wrong when zooming in or out and how to fix this I would be really greatful!</p> <p>Thanks!</p> <p>Here's an image of something identical to what I'm working on: (Curtesy of WPF-Graphics.com) <img src="https://i.stack.imgur.com/mEaQi.jpg" alt="This is a WPF control showing a main image, and a small thumb with a viewport rectangle showing the user what he&#39;s looking at"></p>
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    1. USJonathan Perry
    1. USJonathan Perry
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      1. VTUpMod
    1. COCan you please post more code plus a UI snapshot would be really helpful to understand what actually you are trying to do.
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      1. USWPF-it
    2. COIn the picture I added, what I want to implement is the white rectangle in the `ZoomPanelMiniMap` window
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      1. POCalling a function when canvas zooming is done
      1. USJonathan Perry
 

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