/// <summary>
/// Copy attributes from one cgraph object to another.
/// Throw argument exception if self and destination are not of the same type.
/// Also copies attributes that haven't been introduced in the destination object,
/// unless introduce_new_attrs is false.
/// Return code indicates success or failure.
/// </summary>
public int CopyAttributesTo(CGraphThing destination, bool introduce_new_attrs = true)
{
if (!((this is Node && destination is Node) ||
(this is Edge && destination is Edge) ||
(this is Graph && destination is Graph)))
{
throw new ArgumentException("Argument must be of the same type as self.");
}
// Copying the attributes doesn't work if they have not been introduced in the graph
// Moreover, the copying may just stop at some point if copying of a single attribute fails
if (introduce_new_attrs && MyRootGraph._ptr != destination.MyRootGraph._ptr)
{
CloneAttributeDeclarations(MyRootGraph._ptr, destination.MyRootGraph._ptr);
}
// agcopyattr returns non-zero number on failure.
// Problems have been observed while copying between edges (of the same graph)
// Hypothesis: are the pointers different in this case?
// Hypothesis 2: does it have something to do with the comment "Do not copy key attribute for edges,
// as this must be distinct." in the graphviz source code?
// Returncode 1 has been observed while copying rootgraphs, while the number of attributes was 0
Debug.Assert(_ptr != destination._ptr);
int success = Agcopyattr(_ptr, destination._ptr);
// We implement a workaround for copying between edges
if (success != 0)
{
// Fail for unknown failing cases
if (GetType() != typeof(Edge) && GetAttributes().Count != 0)
{
Debug.Fail("Copying attributes failed");
}
// We work around this doing the following:
var attrs = GetAttributes();
foreach (var key in attrs.Keys)
{
destination.SetAttribute(key, attrs[key]);
}
}
return(0);
}
/// <summary>
/// Delete the given thing from the graph.
/// Is this is a root graph, and thing is a node, its edges are delete too.
/// </summary>
public void Delete(CGraphThing thing)
{
int return_code = Agdelete(_ptr, thing._ptr);
Debug.Assert(return_code == 0);
}
public bool Contains(CGraphThing thing)
{
return(Agcontains(_ptr, thing._ptr) != 0);
}