Path AddEdgeToCanvas(PositionedEdge edge)
{
var edgeSplineFigure = CreateEdgeSpline(edge);
PathGeometry geometryVisible = new PathGeometry();
geometryVisible.Figures.Add(edgeSplineFigure);
geometryVisible.Figures.Add(CreateEdgeArrow(edge));
Path pathVisible = new Path();
pathVisible.Stroke = Brushes.Black;
pathVisible.Fill = Brushes.Black;
pathVisible.StrokeThickness = 1;
pathVisible.Data = geometryVisible;
// remember this spline Path at PositionedEdge to be able to highlight edge from PositionedNodeProperty
edge.Spline = pathVisible;
// and remember the the edge for the spline, so that we can get edge name on spline mouse-over
pathVisible.Tag = edge;
PathGeometry geometryInVisible = new PathGeometry();
geometryInVisible.Figures.Add(edgeSplineFigure);
Path pathInVisible = new Path();
pathInVisible.Stroke = Brushes.Transparent;
pathInVisible.Fill = Brushes.Transparent;
pathInVisible.StrokeThickness = 16;
pathInVisible.Data = geometryInVisible;
pathInVisible.MouseEnter += delegate(object sender, MouseEventArgs e)
{
pathVisible.StrokeThickness = 2;
this.edgeTooltip.Text = ((PositionedEdge)pathVisible.Tag).Name;
Point mousePos = e.GetPosition(this.canvas);
Canvas.SetLeft(this.edgeTooltip, mousePos.X - 5);
Canvas.SetTop(this.edgeTooltip, mousePos.Y - 20);
this.edgeTooltip.Visibility = Visibility.Visible;
};
pathInVisible.MouseLeave += delegate(object sender, MouseEventArgs e)
{
pathVisible.StrokeThickness = 1;
this.edgeTooltip.Visibility = Visibility.Hidden;
};
pathInVisible.MouseMove += delegate(object sender, MouseEventArgs e)
{
Point mousePos = e.GetPosition(this.canvas);
Canvas.SetLeft(this.edgeTooltip, mousePos.X - 5);
Canvas.SetTop(this.edgeTooltip, mousePos.Y - 20);
};
canvas.Children.Add(pathVisible);
canvas.Children.Add(pathInVisible);
return(pathVisible);
}
PathFigure CreateEdgeSpline(PositionedEdge edge)
{
PathFigure figure = new PathFigure();
figure.IsClosed = false;
figure.IsFilled = false;
figure.StartPoint = edge.SplinePoints[0];
for (int i = 1; i < edge.SplinePoints.Count; i += 3)
{
figure.Segments.Add(new BezierSegment(edge.SplinePoints[i], edge.SplinePoints[i + 1], edge.SplinePoints[i + 2], true));
}
return(figure);
}
PathFigure CreateEdgeArrow(PositionedEdge edge)
{
Point splineEndPoint = edge.SplinePoints[edge.SplinePoints.Count - 1];
Point splineEndHandlePoint = edge.SplinePoints[edge.SplinePoints.Count - 2];
Vector tangent = splineEndPoint - splineEndHandlePoint;
tangent.Normalize();
tangent = tangent * 20;
Point basePoint = splineEndPoint - 0.4 * tangent;
PathFigure arrowFigure = new PathFigure();
arrowFigure.IsClosed = true;
arrowFigure.IsFilled = true;
arrowFigure.StartPoint = splineEndPoint; // arrow tip
Vector tangent2 = Rotate90(tangent);
arrowFigure.Segments.Add(new LineSegment(basePoint + tangent2 * 0.15, true));
arrowFigure.Segments.Add(new LineSegment(basePoint - tangent2 * 0.15, true));
return(arrowFigure);
}
PathFigure CreateEdgeArrow(PositionedEdge edge)
{
Point splineEndPoint = edge.SplinePoints[edge.SplinePoints.Count - 1];
Point splineEndHandlePoint = edge.SplinePoints[edge.SplinePoints.Count - 2];
Vector tangent = splineEndPoint - splineEndHandlePoint;
tangent.Normalize();
tangent = tangent * 20;
Point basePoint = splineEndPoint - 0.4 * tangent;
PathFigure arrowFigure = new PathFigure();
arrowFigure.IsClosed = true;
arrowFigure.IsFilled = true;
arrowFigure.StartPoint = splineEndPoint; // arrow tip
Vector tangent2 = Rotate90(tangent);
arrowFigure.Segments.Add(new LineSegment(basePoint + tangent2 * 0.15, true));
arrowFigure.Segments.Add(new LineSegment(basePoint - tangent2 * 0.15, true));
return arrowFigure;
}
PathFigure CreateEdgeSpline(PositionedEdge edge)
{
PathFigure figure = new PathFigure();
figure.IsClosed = false;
figure.IsFilled = false;
figure.StartPoint = edge.SplinePoints[0];
for (int i = 1; i < edge.SplinePoints.Count; i += 3)
{
figure.Segments.Add(new BezierSegment(edge.SplinePoints[i], edge.SplinePoints[i + 1], edge.SplinePoints[i + 2], true));
}
return figure;
}
Path AddEdgeToCanvas(PositionedEdge edge)
{
var edgeSplineFigure = CreateEdgeSpline(edge);
PathGeometry geometryVisible = new PathGeometry();
geometryVisible.Figures.Add(edgeSplineFigure);
geometryVisible.Figures.Add(CreateEdgeArrow(edge));
Path pathVisible = new Path();
pathVisible.Stroke = Brushes.Black;
pathVisible.Fill = Brushes.Black;
pathVisible.StrokeThickness = 1;
pathVisible.Data = geometryVisible;
// remember this spline Path at PositionedEdge to be able to highlight edge from PositionedNodeProperty
edge.Spline = pathVisible;
// and remember the the edge for the spline, so that we can get edge name on spline mouse-over
pathVisible.Tag = edge;
PathGeometry geometryInVisible = new PathGeometry();
geometryInVisible.Figures.Add(edgeSplineFigure);
Path pathInVisible = new Path();
pathInVisible.Stroke = Brushes.Transparent;
pathInVisible.Fill = Brushes.Transparent;
pathInVisible.StrokeThickness = 16;
pathInVisible.Data = geometryInVisible;
pathInVisible.MouseEnter += delegate(object sender, MouseEventArgs e)
{
pathVisible.StrokeThickness = 2;
this.edgeTooltip.Text = ((PositionedEdge)pathVisible.Tag).Name;
Point mousePos = e.GetPosition(this.canvas);
Canvas.SetLeft(this.edgeTooltip, mousePos.X - 5);
Canvas.SetTop(this.edgeTooltip, mousePos.Y - 20);
this.edgeTooltip.Visibility = Visibility.Visible;
};
pathInVisible.MouseLeave += delegate(object sender, MouseEventArgs e)
{
pathVisible.StrokeThickness = 1;
this.edgeTooltip.Visibility = Visibility.Hidden;
};
pathInVisible.MouseMove += delegate(object sender, MouseEventArgs e)
{
Point mousePos = e.GetPosition(this.canvas);
Canvas.SetLeft(this.edgeTooltip, mousePos.X - 5);
Canvas.SetTop(this.edgeTooltip, mousePos.Y - 20);
};
canvas.Children.Add(pathVisible);
canvas.Children.Add(pathInVisible);
return pathVisible;
}
void SetEdgeSplinePoints(PositionedEdge edge, RoutedEdge routedEdge)
{
foreach (Point2D point in routedEdge.SplinePoints) {
edge.SplinePoints.Add(new Point(point.X, point.Y));
}
}
