Re: [PyX-user] How to change the color of the graph

[Joerg L. <jo...@us...>]

Hi Toan,

On 13.01.05, Toan T Nguyen wrote:
[ snip ]
> Anyway, I try the color.palette.Rainbow for better colors but It gave a 
> ZeroDivisionError. Could you help again this time. Or is it a bug?
> 
> Here is the program (the data for one plot are all in one line, x1 y1 x2 
> y2    , different lines correspond to different plots, 14 plots in total):
> 
> ===================================
> from pyx import *
> 
> g = graph.graphxy(width=8, key=graph.key.key(pos="br"),
>         x=graph.axis.log()
> )
> 
> finfile = open('all.dat')
> 
> for i in range(14):
>         data= finfile.readline().split()
> 
>         d = []
>         for idx in range(7,93,4):
>                 d.append([float(data[idx]),float(data[idx+2])])
> 
>         mytitle = "$"+data[1]+"/"+data[2]+"$"
> 
>         g.plot(graph.data.list(d, x=1, y=2, title=mytitle),
>                         [ graph.style.line( [style.linewidth.THIN,color.palette.Rainbow] ) ]
>         )
> 
> g.writeEPSfile('EvsG_75.eps')
[ snip traceback ]

The problem is that there is only one data set to be plotted and, thus,
color.palette.Rainbow does not know which color to choose. At the
moment, this leads to a ZeroDivisionError, which is probably not
optimal. Maybe a reasonable choice would be the first color, i.e.,
the one with value=0.

Anyway, to make your example work, just replace color.palette.Rainbow
by an arbitrary color, e.g., color.rgb.red.

        Jörg