Visualise a data structure (Tree) in a QGraphicsScene

issam

Hi all!

I am developing a small application in witch I have to construct a tree of data then transform it to a graphic (root node, vertices and edges) using the GraphicsView framework.

any idea, how to do that ?

thanks in advance.

Asperamanca

GraphicsView doesn't offer any ready-made items for a tree.

You can try inserting a QTreeView or QTreeWidget as a QGraphicsProxyWidget into the scene.
Pros: Use of an existing widget
Cons: Performance. Probably some pitfalls when using QGraphicsProxyWidget that I don't know about.

You can compose everything yourself, using Lines, Rectangles and Text.
Pros: High performance, looking exactly the way you want
Cons: A lot of work

issam

Hi,
Well it's not exactly a tree, It's an oriented graph : "the reachability graph of a Petri Net":http://en.wikipedia.org/wiki/File:Reachability_graph_for_petri_net.png !

I begin by drawing a Petri Net in a QGraphicsScene then building the graph !

please any help !

Asperamanca

Take a look at the ElasticNodes and the DiagramScene samples (under graphicsview). Between the two, you should find pretty much everything you need.