/// <summary>
/// Adds a new edge.
/// </summary>
/// <returns></returns>
public uint AddEdge(uint vertex1, uint vertex2, uint[] data, ShapeBase shape)
{
var edgeId = _graph.AddEdge(vertex1, vertex2, data);
// increase coordinates length, if needed.
_shapes.EnsureMinimumSize(edgeId + 1);
_shapes[edgeId] = shape;
return(edgeId);
}
