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POWPF custom panel scaling to fit window
 

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    <p>I have a WPF custom panel which arranges its child elements in a spiral shape as per my requirements. The problem I am having is to do with scaling of the items when the window is resized - at the moment it does not scale. Can anyone provide a solution? Thanks - Ben</p> <p><strong>Custom panel</strong></p> <pre><code>public class TagPanel : Panel { protected override System.Windows.Size MeasureOverride(System.Windows.Size availableSize) { Size resultSize = new Size(0, 0); foreach (UIElement child in Children) { child.Measure(availableSize); resultSize.Width = Math.Max(resultSize.Width, child.DesiredSize.Width); resultSize.Height = Math.Max(resultSize.Height, child.DesiredSize.Height); } resultSize.Width = double.IsPositiveInfinity(availableSize.Width) ? resultSize.Width : availableSize.Width; resultSize.Height = double.IsPositiveInfinity(availableSize.Height) ? resultSize.Height : availableSize.Height; return resultSize; } protected class InnerPos { public UIElement Element { get; set; } public Size Size { get; set; } } private Point GetSpiralPosition(double theta, Size windowSize) { double a = 5.0; double n = 1.0; double r = a * (Math.Pow(theta, 1.0 / n)); double x = r * Math.Cos(theta); double y = r * Math.Sin(theta); x += windowSize.Width / 2.0; y += windowSize.Height / 2.0; return new Point(x,y); } private Rect CreateRectangleCenteredAtPoint(Point pt, double width, double height) { return new Rect(new Point(pt.X - (width / 2.0), pt.Y - (height / 2.0)), new Size(width, height)); } protected override System.Windows.Size ArrangeOverride(System.Windows.Size finalSize) { //double startPos = 0.0; List&lt;InnerPos&gt; positions = new List&lt;InnerPos&gt;(); foreach (UIElement ch in Children) { // If this is the first time // we've seen this child, add our transforms //if (ch.RenderTransform as TransformGroup == null) //{ // ch.RenderTransformOrigin = new Point(0, 0.5); // TransformGroup group = new TransformGroup(); // ch.RenderTransform = group; // group.Children.Add(new ScaleTransform()); // group.Children.Add(new TranslateTransform()); //} positions.Add(new InnerPos() { Element = ch, Size = ch.DesiredSize }); } //double currentTopMax List&lt;Rect&gt; alreadyUsedPositions = new List&lt;Rect&gt;(); foreach (InnerPos child in positions.OrderByDescending(i =&gt; i.Size.Width)) { for (double theta = 0.0; theta &lt; 100.0; theta += 0.1) { Point spiralPos = GetSpiralPosition(theta, finalSize); Rect centeredRect = CreateRectangleCenteredAtPoint(spiralPos, child.Element.DesiredSize.Width, child.Element.DesiredSize.Height); bool posIsOk = true; foreach (Rect existing in alreadyUsedPositions) { bool positionClashes = existing.IntersectsWith(centeredRect); if (positionClashes == true) { posIsOk = false; break; } } if (posIsOk) { alreadyUsedPositions.Add(centeredRect); child.Element.Arrange(centeredRect); break; } } } return finalSize; } } </code></pre>
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