examples/graphs/bar.py

   1 from pyx import *                   # bar.dat looks like:
   2                                     # #month    min max
   3                                     # January    -5   1
   4                                     # Feburary   -4   3
   5 # we prepare some stuff first                   ...
   6 bap = graph.baraxispainter # just an abbreviation
   7 a1 = graph.baraxis(painter=bap(nameattrs=None)) # for single bars
   8 a2 = graph.baraxis(painter=bap(nameattrs=(trafo.rotate(45),
   9                                           text.halign.right),
  10                                           innerticklength=0.2),
  11                    subaxis=graph.baraxis(dist=0)) # for several bars
  12 df = data.datafile("bar.dat") # read the datafile just once
  13 d = [graph.data(df, x="month", y="min"), graph.data(df, x=1, y=3)]
  14 nofirst = (graph.changesequence(None, [deco.stroked([color.gray.black])]),
  15            graph.changesequence(None, [color.rgb.green])) # special draw attrs
  16
  17 c = canvas.canvas() # we draw several plots, thus we create a main canvas
  18 g = c.insert(graph.graphxy(ypos=4.5, width=8, height=4, x=a1))
  19 g.plot(d, graph.bar(stacked=1, barattrs=nofirst))
  20 g.finish() # we explicitly finish the plot allow for a reuse of "d"
  21 g2 = c.insert(graph.graphxy(width=8, x=a2, height=4))
  22 g2.plot(d, graph.bar())
  23 c.writetofile("bar")