private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
Point clickpoint = e.GetPosition(this.MyPanel);
DrawingVisual dv = new DrawingVisual();
this.drawRect(dv, clickpoint);
MyPanel.AddChild(dv);
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
DrawingVisual dv = new DrawingVisual();
DrawingContext dc = dv.RenderOpen();
Brush brush = Brushes.LightGreen;
Pen pen = new Pen(Brushes.SteelBlue, 3);
dc.DrawRectangle(brush, pen, new Rect(new Point(10, 10), new Size(50, 25)));
dc.DrawEllipse(brush, pen, new Point(10, 60), 50, 25);
dc.DrawLine(pen, new Point(10, 100), new Point(80, 120));
dc.Close();
MyPanel.AddChild(dv);
}