How Draw rectangle in WPF?

Question

I need draw rectangle in canvas. I know how to draw. But I did not get to do so would draw on a 360-degree

Example. blue, lilac, green they are one and the same rect

Answer 1

If someone is interested, this is solution for UWP. (based on @Kris answer).

It works for mouse, touch and pen.

Code behind:

private Point startPoint;
private Rectangle rect;

private void canvas_PointerPressed(object sender, PointerRoutedEventArgs e)
{
    startPoint = e.GetCurrentPoint(canvas).Position;
    rect = new Rectangle()
    {
        Stroke = new SolidColorBrush(Colors.LightCoral),
        StrokeThickness = 5
    };

    Canvas.SetLeft(rect, startPoint.X);
    Canvas.SetTop(rect, startPoint.Y);
    canvas.Children.Add(rect);
}

private void canvas_PointerMoved(object sender, PointerRoutedEventArgs e)
{
    if (!e.Pointer.IsInContact || rect == null)
        return;

    var pos = e.GetCurrentPoint(canvas).Position;

    var x = Math.Min(pos.X, startPoint.X);
    var y = Math.Min(pos.Y, startPoint.Y);

    var w = Math.Max(pos.X, startPoint.X) - x;
    var h = Math.Max(pos.Y, startPoint.Y) - y;

    rect.Width = w;
    rect.Height = h;

    Canvas.SetLeft(rect, x);
    Canvas.SetTop(rect, y);
}

private void canvas_PointerReleased(object sender, PointerRoutedEventArgs e)
{
    rect = null;
}

XAML: