public void UpdatePaths()
{
//catch for when the node is removed and layout update is still triggered
try
{
if (this.Parent == null)
{
return;
}
if (!this.HasAncestor(graph.ViewPort))
{
return;
}
Point r1 = this.TransformToAncestor(graph.ViewPort).Transform(new Point(ActualWidth, 8f));
//need to add a text drawing of Order for lines
//as the order is important
//to know when connecting for functions
int i = 1;
foreach (UINodePoint n in to)
{
if (n.Parent == null)
{
continue;
}
if (!n.HasAncestor(graph.ViewPort))
{
continue;
}
Point r2 = n.TransformToAncestor(graph.ViewPort).Transform(new Point(0f, 8f));
Path path = null;
paths.TryGetValue(n, out path);
double dy = r2.Y - r1.Y;
Point mid = new Point((r2.X + r1.X) * 0.5f, (r2.Y + r1.Y) * 0.5f + dy * 0.5f);
TextBlock num = null;
numbers.TryGetValue(n, out num);
if (path != null)
{
path.IsHitTestVisible = false;
Canvas.SetZIndex(path, -1);
if (path.Data == null)
{
path.VerticalAlignment = VerticalAlignment.Top;
path.HorizontalAlignment = HorizontalAlignment.Left;
PathGeometry p = new PathGeometry();
PathFigure pf = new PathFigure();
pf.IsClosed = false;
pf.StartPoint = r1;
BezierSegment seg = new BezierSegment(r1, mid, r2, true);
pf.Segments.Add(seg);
p.Figures.Add(pf);
path.Data = p;
}
else
{
PathGeometry p = (PathGeometry)path.Data;
PathFigure pf = p.Figures[0];
pf.StartPoint = r1;
BezierSegment seg = (BezierSegment)pf.Segments[0];
seg.Point1 = r1;
seg.Point2 = mid;
seg.Point3 = r2;
}
}
if (num != null)
{
Point p = CatmullRomSpline.GetPointOnBezierCurve(r1, mid, r2, 0.25f);
num.Text = i.ToString();
num.IsHitTestVisible = false;
Canvas.SetZIndex(num, -1);
Canvas.SetLeft(num, p.X);
Canvas.SetTop(num, p.Y);
}
i++;
}
}
catch { }
}