/// <summary>
/// 在窗口 上按下左键时触发
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
Point point = e.GetPosition(Mytest);
DrawingVisual visual = new DrawingVisual();
DrawSquare(visual, point);
Mytest.AddVisual(visual);
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
DrawingVisual dv = new DrawingVisual();
DrawingContext dc = dv.RenderOpen();
Brush brush = Brushes.Red;
Pen pen = new Pen(Brushes.Green, 3);
dc.DrawRectangle(brush, pen, new Rect(new Point(100, 100), new Size(50, 100)));
dc.DrawEllipse(brush, pen, new Point(200, 200), 20, 100);
dc.DrawLine(pen, new Point(0, 0), new Point(50, 50));
dc.DrawLine(pen, new Point(50, 50), new Point(20, 50));
dc.DrawLine(pen, new Point(20, 50), new Point(0, 0));
dc.Close();
Mytest.AddVisual(dv);
}