Thread: Drawing a Polygon line by line using pointAnimation

Hi, the program asks the user to input 4 x&y coordinates and from those points a polygon will be created line by line using animations. However, my program crashes after I inputted the 4 coordinates because of my PropertyPath declaration. Any idea on what should be the declared on the PropertyPath Value?

Code:
NewPolygon = new Polygon();
NewPolygon.Stroke = Brushes.Black;
NewPolygon.StrokeThickness = 2;


Storyboard sb = new Storyboard();
PointAnimation pa1 = new PointAnimation();
pa1.From=new Point(Xone, Yone);
pa1.To = new Point(Xtwo, Ytwo);
pa1.Duration = TimeSpan.FromSeconds(2);

PointAnimation pa2 = new PointAnimation();
pa2.From = new Point(Xtwo, Ytwo);
pa2.To = new Point(Xthree, Ythree);
pa2.Duration = TimeSpan.FromSeconds(2);

PointAnimation pa3 = new PointAnimation();
pa3.From = new Point(Xthree, Ythree);
pa3.To = new Point(Xfour, Yfour);
pa3.Duration = TimeSpan.FromSeconds(2);


Storyboard.SetTargetProperty(pa1, new PropertyPath("(Xtwo, Ytwo)"));
Storyboard.SetTargetProperty(pa1, new PropertyPath("(Xthree, Ythree)"));
Storyboard.SetTargetProperty(pa1, new PropertyPath("(Xfour, Yfour)"));


sb.Children.Add(pa1);
sb.Children.Add(pa2);
sb.Children.Add(pa3);


NewPolygon.BeginStoryboard(sb);

The error that pops out after entering the coordinates:
An unhandled exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dll

Additional information: Cannot resolve all property references in the property path 'Point'. Verify that applicable objects support the properties.

Is it possible? need help