DrawGVizColor

DrawGVizColor(Layout, PltFNm, Desc=TStr(), NodeLabels=False, NIdColorH=TIntStrH())

A graph method that draws a graph using a selected GraphViz Layout engine with nodes colored. Useful for drawing small (<100 node) graphs. Creates a file with name PltFNm.

Parameters:

• Layout: TGVizLayout

  One of gvlDot, gvlNeato, gvlTwopi, gvlCirco, gvlSfdp. The type of layout for the graph.

• PltFNm: string

  Output filename (extension .ps, .png, .gif) determines the output format.

• Desc: string

  A string describing the visualization.

• NodeLabels: bool

  Whether or not the nodes in image have labels associated with them.

• NIdColorH: Python dictionary or TIntStrH, a hash table with int keys and string values

  Maps node ids to node colors (see GraphViz documentation for more details).

Return value:

• None

Note that larger graphs (more than a few hundred nodes) may take several minutes to finish generating the image. The following example shows how to make a pretty graph image for nodes in TNGraph, TUNGraph, and TNEANet:

import snap

Graph = snap.GenRndGnm(snap.TNGraph, 10, 20)
Graph.DrawGVizColor(snap.gvlDot, "graph.png", "graph 1")

UGraph = snap.GenRndGnm(snap.TUNGraph, 10, 40)
UGraph.DrawGVizColor(snap.gvlNeato, "graph_undirected.png", "graph 2", True)

NIdColorH = { 0 : "green", 1 : "red", 2 : "purple", 3 : "blue", 4 : "yellow" }
Network = snap.GenRndGnm(snap.TNEANet, 5, 10)
Network.DrawGVizColor(snap.gvlSfdp, "network.png", "graph 3", True, NIdColorH)