GraphLib question: setX: Y: behaves fishy for me.

[Paul Johnson]

I'm using GraphLib 1.2 and I want to position Nodes, then move them 
around both by methods like setX:Y: or by repositioning them with the mouse.

What I find is a disconnect between where nodes think they are and where 
they show in the picture.  Here's what I mean.

The method to nodeItem setX: Y: does not reset items in the Canvas. I 
can get the setX:Y: method to work if I change it inside the 
DiGraphNode.m file, before createEnd is called on the nodeItem. But, if 
I try to use setX:Y: later, it does not register in the Canvas. But the 
nodeItem's own coordinates do change.

For example, from the DynamicGraph (boing graph) test example, look 
below where I try to position all of the nodes at 55, 66.  The set 
command is does get through to the nodeItems, but their position on the 
grid is not changed accordingly.

This means I have no start time control over positioning of objects, but 
I can use the moveX:Y: command to incrementally move.


- buildObjects
{
  int i,ii,newK;
  id aNode;

  [super buildObjects];

  theNet = [DiGraph createBegin: [self getZone]];
  [theNet setCanvas: graphCanvas];
  [theNet createEnd];

  for (i = 0; i < population; i++)
    [theNet addNode: [[[DiGraphNode createBegin: [self getZone]]
                        setNodeLabel: "Node"]
                       createEnd]];

  entityList = [theNet getNodeList];

  for (i = 0; i < population; i++)
    {
      aNode = [entityList atOffset: i];

      [[aNode getNodeItem] setX: 55 Y: 66];

      printf ("aNode says it is at %d %d", [[aNode getNodeItem] getX], 
[[aNode getNodeItem] getY]);


    }
  return self;
}


The output says the node knows its position
./dynamicGraph
aNode says it is at 55 66aNode says it is at 55 66

but they don't show in the graph there.
--
Paul E. Johnson                       email: address@hidden
Dept. of Political Science            http://lark.cc.ku.edu/~pauljohn
University of Kansas                  Office: (785) 864-9086
Lawrence, Kansas 66045                FAX: (785) 864-5700


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