/// <summary>
/// Removes an Edge and its associated DirectedEdges from their from-Nodes and
/// from this PlanarGraph. Note: This method does not remove the Nodes associated
/// with the Edge, even if the removal of the Edge reduces the degree of a
/// Node to zero.
/// </summary>
/// <param name="edge"></param>
public void Remove(Edge edge)
{
Remove(edge.GetDirEdge(0));
Remove(edge.GetDirEdge(1));
_edges.Remove(edge);
edge.Remove();
}
/// <summary>
/// Adds an <see cref="Edge" /> to the subgraph.
/// The associated <see cref="DirectedEdge" />s and <see cref="Node" />s are also added.
/// </summary>
/// <param name="e">The <see cref="Edge" /> to add.</param>
public void Add(Edge e)
{
if (edges.Contains(e))
{
return;
}
edges.Add(e);
dirEdges.Add(e.GetDirEdge(0));
dirEdges.Add(e.GetDirEdge(1));
nodeMap.Add(e.GetDirEdge(0).FromNode);
nodeMap.Add(e.GetDirEdge(1).FromNode);
}
/// <summary>
/// Adds the Edge and its DirectedEdges with this PlanarGraph.
/// Assumes that the Edge has already been created with its associated DirectEdges.
/// Only subclasses can add Edges, to ensure the edges added are of the right class.
/// </summary>
/// <param name="edge"></param>
protected void Add(Edge edge)
{
_edges.Add(edge);
Add(edge.GetDirEdge(0));
Add(edge.GetDirEdge(1));
}