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    copied!<p>Ok, I've managed to cause the arc to open and close. The way I did this was by defining both of the Arc's lines like this</p> <pre><code>&lt;PathGeometry&gt; &lt;PathFigure StartPoint="50,0" IsClosed="True"&gt; &lt;LineSegment Point="0,100" x:Name="m_leftLine" /&gt; &lt;LineSegment Point="100,100" x:Name="m_rightLine" /&gt; &lt;/PathFigure&gt; &lt;/PathGeometry&gt; </code></pre> <p>And then just writing a code behind for the slider's <code>ValueChanged</code> event and recalculate the line's X position using the required angle. This resulted in the following code:</p> <pre><code>public partial class MyFovControl : UserControl { private float m_oldAngleValue; private float m_newAngleValue; public MyFovControl() { InitializeComponent(); this.zoomSlider.ValueChanged += new RoutedPropertyChangedEventHandler&lt;double&gt;(zoomSlider_ValueChanged); m_oldAngleValue = m_newAngleValue = 0; } void zoomSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs&lt;double&gt; e) { m_newAngleValue = (float)(Convert.ToDouble((double)lblFovXAngle.Content)); // Happens only once the first time. if (m_oldAngleValue == 0) { m_oldAngleValue = m_newAngleValue; } m_leftLine.Point = new Point(m_leftLine.Point.X + (m_oldAngleValue - m_newAngleValue), m_leftLine.Point.Y); m_rightLine.Point = new Point(m_rightLine.Point.X - (m_oldAngleValue - m_newAngleValue), m_rightLine.Point.Y); m_oldAngleValue = m_newAngleValue; } } </code></pre> <p>I know, very messi, but that's the only way I could think of and from what I've searched online - possibly the only way there is.</p>
 

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