如何在wpf中通过选择笔触来缩放形状

<Canvas>
    <Rectangle Width="100" Height="100" Fill="Blue" Stroke="Black" StrokeThickness="2">
        <Rectangle.RenderTransform>
            <ScaleTransform ScaleX="1" ScaleY="1" />
        </Rectangle.RenderTransform>
    </Rectangle>
</Canvas>

private void Rectangle_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    Rectangle rectangle = (Rectangle)sender;
    ScaleTransform scaleTransform = (ScaleTransform)rectangle.RenderTransform;

    // 根据选择的笔触来设置缩放比例
    if (rectangle.StrokeThickness == 2)
    {
        rectangle.StrokeThickness = 4;
        scaleTransform.ScaleX = 1.5;
        scaleTransform.ScaleY = 1.5;
    }
    else
    {
        rectangle.StrokeThickness = 2;
        scaleTransform.ScaleX = 1;
        scaleTransform.ScaleY = 1;
    }
}