examples/render.lua

   1 local gr = require "graph"
   2
   3 if #arg < 2 then
   4   print("usage: lua render.lua FILE FORMAT")
   5   print("       FORMAT: dot, neato, twopi, fdp, circo")
   6   os.exit(-1)
   7 end
   8
   9 local fmt = arg[2] or "dot"
  10 --
  11 -- For simple formatted printing
  12 --
  13 local function printf(fmt, ...)
  14   print(string.format(fmt, ...))
  15 end
  16
  17 local function gshow(g)
  18   local fn = os.tmpname() .. ".dot"
  19   g:write(fn)
  20   os.execute("dotty "..fn)
  21   os.remove(fn)
  22 end
  23
  24 -- Provide simple reference for frequently used functions (optional)
  25 node, edge, subgraph, cluster, digraph, strictdigraph, ugraph =
  26   gr.node, gr.edge, gr.subgraph, gr.cluster, gr.digraph, gr.strictdigraph, gr.graph
  27
  28 local f, err = assert(loadfile(arg[1]))
  29 local g = f(fmt)
  30
  31 printf("Generated '%s' format:", fmt)
  32 g:write()
  33 g:show()
  34 g:render("pdf", "out.pdf", fmt)
  35 g:close()