/// <summary>
/// Draws the edge-like connectors from a node to its labels
/// </summary>
private void RenderLabelEdges(IRenderContext context, INode node, VisualGroup container)
{
int count = 0;
if (node.Labels.Count > 0)
{
// Create a SimpleEdge which will be used as a dummy for the rendering
SimpleEdge simpleEdge = new SimpleEdge(null, null);
// Assign the style
simpleEdge.Style = new MySimpleEdgeStyle {
PathThickness = 2
};
// Create a SimpleNode which provides the sourceport for the edge but won't be drawn itself
SimpleNode sourceDummyNode = new SimpleNode {
Layout = new RectD(0, 0, node.Layout.Width, node.Layout.Height),
Style = node.Style
};
// Set sourceport to the port of the node using a dummy node that is located at the origin.
simpleEdge.SourcePort = new SimplePort(sourceDummyNode, FreeNodePortLocationModel.NodeCenterAnchored);
// Create a SimpleNode which provides the targetport for the edge but won't be drawn itself
SimpleNode targetDummyNode = new SimpleNode();
// Create port on targetDummynode for the label target
targetDummyNode.Ports =
new ListEnumerable <IPort>(new[]
{ new SimplePort(targetDummyNode, FreeNodePortLocationModel.NodeCenterAnchored) });
simpleEdge.TargetPort = new SimplePort(targetDummyNode, FreeNodePortLocationModel.NodeCenterAnchored);
var topLeft = node.Layout.GetTopLeft();
var labelLocations = node.Labels.Select(l => l.GetLayout().GetCenter() - topLeft);
// Render one edge for each label
foreach (PointD labelLocation in labelLocations)
{
// move the dummy node to the location of the label
targetDummyNode.Layout = new MutableRectangle(labelLocation, SizeD.Zero);
// now create the visual using the style interface:
IEdgeStyleRenderer renderer = simpleEdge.Style.Renderer;
IVisualCreator creator = renderer.GetVisualCreator(simpleEdge, simpleEdge.Style);
if (container.Children.Count > count)
{
container.Children[count] = creator.UpdateVisual(context, container.Children[count]);
}
else
{
container.Children.Add(creator.CreateVisual(context));
}
count++;
}
}
// remove superfluous visuals
while (container.Children.Count > count)
{
container.Children.RemoveAt(container.Children.Count - 1);
}
}
