c# - c# wpf ダブルアニメーション/ストーリーボード PropertyPath

Question

曲線をゆっくりとアニメーション化しようとしていますが、開始点から X2、Y2 ポイントまでアニメーション化する場合にどの PropertyPath を使用すればよいかわかりません。

private void DrawLine(Canvas canvas, double X1, double Y1, double X2, double  Y2, Brush color)
{
    QuadraticBezierSegment qbs = new QuadraticBezierSegment(new Point(X2,   Y1), new Point(X2, Y2), true);

    PathSegmentCollection pscollection = new PathSegmentCollection();
    pscollection.Add(qbs);

    PathFigure pf = new PathFigure();
    pf.Segments = pscollection;
    pf.StartPoint = new Point(X1, Y1);

    PathFigureCollection pfcollection = new PathFigureCollection();
    pfcollection.Add(pf);

    PathGeometry pathGeometry = new PathGeometry();
    pathGeometry.Figures = pfcollection;

    Path path = new Path();
    path.Data = pathGeometry;
    path.Stroke = color;
    path.StrokeThickness = 1;
    canvas.Children.Add(path);

    Storyboard story = new Storyboard();

    DoubleAnimation dAnim1 = new DoubleAnimation(Y1, Y2, new Duration(new TimeSpan(0, 0, 0, 0, 750)));
    DoubleAnimation dAnim2 = new DoubleAnimation(X1, X2, new Duration(new TimeSpan(0, 0, 0, 0, 750)));

    Storyboard.SetTargetProperty(dAnim1, new PropertyPath("???"));
    Storyboard.SetTargetProperty(dAnim2, new PropertyPath("???"));
    story.Children.Add(dAnim1);
    story.Children.Add(dAnim2);

    path.BeginStoryboard(story);

}