public override void MakeVisual()
{
if (GeometryEdge.Curve == null)
{
return;
}
SetValue(Canvas.LeftProperty, Edge.BoundingBox.Left);
SetValue(Canvas.TopProperty, Edge.BoundingBox.Bottom);
if (StrokeDashArray == null)
{
// Note that Draw.CreateGraphicsPath returns a curve with coordinates in graph space.
var pathFigure = Draw.CreateGraphicsPath((DrawingEdge.GeometryObject as GeometryEdge).Curve);
var pathGeometry = new PathGeometry();
pathGeometry.Figures.Add(pathFigure);
Draw.DrawEdgeArrows(pathGeometry, DrawingEdge, FillArrowheadAtSource, FillArrowheadAtTarget);
// Apply a translation to bring the coordinates in node space (i.e. top left corner is 0,0).
pathGeometry.Transform = new MatrixTransform()
{
Matrix = new Matrix(1.0, 0.0, 0.0, 1.0, -Edge.BoundingBox.Left, -Edge.BoundingBox.Bottom)
};
if (SelectedForEditing && GeometryEdge.UnderlyingPolyline != null)
{
Draw.DrawUnderlyingPolyline(pathGeometry, this);
}
var path = new Path()
{
Data = pathGeometry, StrokeThickness = Math.Max(LineWidth, Edge.Attr.LineWidth), Stroke = EdgeBrush, Fill = EdgeBrush
};
Content = path;
}
else
{
// A dash array has been specified. I don't want to apply it to both the edge and the arrowheads; for this reason, I'm going to split the drawing in two Path instances.
// This is not done in the general case to keep the number of Paths down.
var pathFigure = Draw.CreateGraphicsPath((DrawingEdge.GeometryObject as GeometryEdge).Curve);
var pathGeometry = new PathGeometry();
pathGeometry.Figures.Add(pathFigure);
pathGeometry.Transform = new MatrixTransform()
{
Matrix = new Matrix(1.0, 0.0, 0.0, 1.0, -Edge.BoundingBox.Left, -Edge.BoundingBox.Bottom)
};
if (SelectedForEditing && GeometryEdge.UnderlyingPolyline != null)
{
Draw.DrawUnderlyingPolyline(pathGeometry, this);
}
DoubleCollection dc = new DoubleCollection();
foreach (double d in StrokeDashArray)
{
dc.Add(d);
}
var path1 = new Path()
{
Data = pathGeometry, StrokeThickness = Math.Max(LineWidth, Edge.Attr.LineWidth), Stroke = EdgeBrush, Fill = EdgeBrush, StrokeDashArray = dc
};
pathGeometry = new PathGeometry();
pathGeometry.Transform = new MatrixTransform()
{
Matrix = new Matrix(1.0, 0.0, 0.0, 1.0, -Edge.BoundingBox.Left, -Edge.BoundingBox.Bottom)
};
Draw.DrawEdgeArrows(pathGeometry, DrawingEdge, FillArrowheadAtSource, FillArrowheadAtTarget);
var path2 = new Path()
{
Data = pathGeometry, StrokeThickness = Math.Max(LineWidth, Edge.Attr.LineWidth), Stroke = EdgeBrush, Fill = EdgeBrush
};
var c = new Grid();
c.Children.Add(path1);
c.Children.Add(path2);
Content = c;
}
}
