private void clear(object sender, RoutedEventArgs e) { positionTracker.stop(); hasCoordinates = false; thickness = 1; minCoordinates = default; maxCoordinates = default; points.Points.Clear(); dots.Children.Clear(); dots.Children.Add(currentPositionDot); currentPositionDot.RadiusX = 3; currentPositionDot.RadiusY = 3; positionTracker.start(); }