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POTranslatePoint within a Canvas
 

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  1. POTranslatePoint within a Canvas
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    <p>I have a scroll viewer in my application that contains a canvas, in which I have a tree custom-drawn tree structure. I'm trying to get the position of a particular node element in the canvas relative to the scroll viewer (so I can scroll to it), but my attempts aren't working.</p> <p>I've tried using <code>marker.TranslatePoint(new Point(0, 0), scrollViewer)</code> (where <code>marker</code> is the element in the canvas), but this is just returning the position of the canvas, rather than the marker. Similarly, if I try <code>marker.TranslatePoint(new Point(0, 0), layoutCanvas)</code>, I invariably just get <code>(0,0)</code> as the result, regardless of where the marker actually is.</p> <p>Here's my code:</p> <pre><code>var marker = m_Metadata[node].Marker; var location = marker.TranslatePoint(new Point(0, 0), scrollViewer); // This inorrectly gives the position of the canvas, rather than the marker. var size = new Size(marker.Width, marker.Height); var markerArea = new Rect(location, size); double horizontalOffset = (markerArea.Right + markerArea.Left - scrollViewer.ViewportWidth) / 2; double verticalOffset = (markerArea.Bottom + markerArea.Top - scrollViewer.ViewportHeight) / 2; </code></pre> <p>I've also tried using <code>marker.TransformToVisual(scrollViewer).Transform(new Point(0, 0)</code>, but this gives the same results.</p> <p>I can work around it by using <code>Canvas.GetLeft</code>, <code>Canvas.GetTop</code> et al, but this is messy and convoluted (since they won't always be left- and top-aligned).</p> <p>How can I fix this, or does it just not work for canvases?</p>
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    1. USWill Vousden
    1. USWill Vousden
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    1. COQuestion, doesn't a canvas restrict you to aligning items based on offset from top and left? You can't align on right or bottom in a canvas. Maybe I'm wrong...
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      1. USAviad P.
    2. CONope, you can use Canvas.SetBottom and Canvas.SetRight as well.
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      1. POTranslatePoint within a Canvas
      1. USWill Vousden
 

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