Silverlight 如何创建一端跟踪鼠标指针的多段线

假设多段线的一端固定在0,0，当我移动鼠标时，我希望多段线的另一端正好位于鼠标指针上。在这种情况下我该怎么办

对不起，我对Silverlight很陌生

System.Windows.Point staticPoint = new System.Windows.Point(100, 100);
System.Windows.Point mousePoint = e.GetPosition(CanvasContainer);

PointCollection polygonPoints = new PointCollection();
polygonPoints.Add(staticPoint);
polygonPoints.Add(mousePoint);

polyline.Points = polygonPoints;