public override void ApplyLayout(LayoutGraph graph)
{
// determine the single node to keep at the center.
var provider = graph.GetDataProvider("NodeLayouts");
Node centerNode = null;
if (provider != null)
{
centerNode = graph.Nodes.FirstOrDefault(n => provider.Get(n) != null);
}
if (CoreLayout != null)
{
if (centerNode != null)
{
// remember old center
RectD oldLayout = (RectD)provider.Get(centerNode);
var fixedLocation = new YPoint(graph.GetX(centerNode) + graph.GetWidth(centerNode), graph.GetY(centerNode));
//Set to saved size (this is important for collapsed nodes to ensure correct size)
graph.SetSize(centerNode, oldLayout.Width, oldLayout.Height);
// run layout
CoreLayout.ApplyLayout(graph);
// obtain new center
var newFixedLocation = new YPoint(graph.GetX(centerNode) + graph.GetWidth(centerNode),
graph.GetY(centerNode));
// and adjust the layout
LayoutGraphUtilities.MoveSubgraph(graph, graph.GetNodeCursor(), fixedLocation.X - newFixedLocation.X,
fixedLocation.Y - newFixedLocation.Y);
}
else
{
CoreLayout.ApplyLayout(graph);
}
}
}
/// <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);
}
}