/// <summary>
/// Adjusts the edge end points so they don't end outside the shape of the node they are attached to.
/// </summary>
private static void AdjustPortLocation(LayoutGraph graph, Edge e, YPointPath path, bool atSource)
{
Node node = atSource ? e.Source : e.Target;
YPoint pointRel = atSource ? graph.GetSourcePointRel(e) : graph.GetTargetPointRel(e);
// get offset from the node center to the end of the shape at the node side the edge connects to
LineSegment segment = path.GetLineSegment(atSource ? 0 : path.Length() - 2);
double offset = Math.Min(graph.GetWidth(node), graph.GetHeight(node)) / 2;
double offsetX = segment.DeltaX > 0 ^ atSource ? -offset : offset;
double offsetY = segment.DeltaY > 0 ^ atSource ? -offset : offset;
// if the edge end point is at the center of this side, we use the calculated offset to put the end point on
// the node bounds, otherwise we prolong the last segment to the center line of the node so it doesn't end
// outside the node's shape
YPoint newPortLocation = segment.IsHorizontal
? new YPoint(pointRel.Y != 0 ? 0 : offsetX, pointRel.Y)
: new YPoint(pointRel.X, pointRel.X != 0 ? 0 : offsetY);
if (atSource)
{
graph.SetSourcePointRel(e, newPortLocation);
}
else
{
graph.SetTargetPointRel(e, newPortLocation);
}
}
public void ApplyLayout(LayoutGraph graph)
{
var rows = graph.GetNodeArray();
// sort the rows by their vertical coordinate
Array.Sort(rows, (node1, node2) => (int)(graph.GetCenterY(node1) - graph.GetCenterY(node2)));
// layout the nodes in a column
double currentY = 0;
foreach (var node in rows)
{
graph.SetLocation(node, 0, currentY);
currentY += graph.GetHeight(node) + Distance;
}
// there should be no edges between the 'row' nodes but if there are some, all their bends shall be removed
foreach (var edge in graph.Edges)
{
graph.SetPoints(edge, new YList());
}
}
public override object Get(Object dataHolder)
{
Node node = dataHolder as Node;
if (node != null)
{
// copy descriptor to keep all settings for this node
NodeLayoutDescriptor descriptor = new NodeLayoutDescriptor();
descriptor.LayerAlignment = nld.LayerAlignment;
descriptor.MinimumDistance = nld.MinimumDistance;
descriptor.MinimumLayerHeight = nld.MinimumLayerHeight;
descriptor.NodeLabelMode = nld.NodeLabelMode;
// anchor nodes on grid according to their alignment within the layer
descriptor.GridReference = new YPoint(0.0, (nld.LayerAlignment - 0.5) * graph.GetHeight(node));
descriptor.PortAssignment = gridPortAssignment;
return(descriptor);
}
return(null);
}