Better support for multi level graphs

[saskaale]

Openning this ticket as a feature request for the refractor of the multilevel graph nodes.

DESIRED BEHAVIOR

• The changing of the levels would be based on the zoom level instead of the click on the node.

POSSIBLE IMPLEMENTATIONS

1. SHOWING/HIDING nodes according to their levels (PREFERED)

   • the nodes would have the integer variable associated to their "level"
     • show only nodes with one level according to the zoom

   CHALLENGES
   - maintain graph layout in the nested levels

2. REDRAWING THE GRAPH (through set() method) according to the zoom level
   CHALLENGES
   - maintaining continuous zoom while REDRAWING (calling set()) the graph with the big subgraph

[canerakdas]

Hey Ales,

I have an idea about the multi-level graph plugin ( #127 ).

The multi-level feature doesn't add any feature into the ccNetViz, it's using only ccNetViz features.
IMHO multi-level plugin provides a better structure into the library.

Those features need to be developed;
Zoom in works perfectly. But we need to find a better method to move to the outside graph. When you're moving to a child graph I set the viewport size to 0.99. When viewport size again 1 I have shown to the parent graph.

Also, we can try to unbind the zoom event when the graph level changed.

I'm waiting for your reviews and suggestions

[saskaale]

@canerakdas
I just commented it out.