Re[2]: [PyX-user] various user-specified colors

[Alan G I. <ai...@am...>]

On Thu, 9 Mar 2006, Andre Wobst apparently wrote: 
> But you can of course also do a real solution within the 
> framework of PyX. You would need to create an specialized 
> bar style, which can highlight some bars.
> [...] there are no mysteries at all ... 

Well I'm still a newbie dealing with many mysteries here.
But how about allowing provision of a styles list to the bar 
class?  I suggest this is a good idea to include in the bar 
class (and not an unusual functionality).  Without in any 
way presuming to suggest a design---I don't pretend to know 
a good one---something that would function like below.

Cheers,
Alan


=============================================================================

class bar_styles(graph.style.bar):
    '''
    Allow a styles list, that is cycled through.
    '''

    default_style = [color.palette.ReverseRainbow,
                     deco.stroked([color.grey.black])]

    def __init__(self, styles_list=[], **args):
        self.drawpoint_calls = 0
        self.num_styles = len(styles_list)
        self.styles_list = styles_list
        graph.style.bar.__init__(self, **args)

    def selectstyle(self, privatedata, sharedata, agraph,
                    selectindex, selecttotal):
        graph.style.bar.selectstyle(self,
                                    privatedata, sharedata, 
                                    agraph,
                                    selectindex, selecttotal)
        privatedata.styles_list = [attr.selectattrs(self.default_style
                                   + mystyle, selectindex, selecttotal)
                                   for mystyle in self.styles_list]

    def drawpoint(self, privatedata, sharedata, agraph, point):
        savebarattrs = privatedata.barattrs
        privatedata.barattrs = privatedata.styles_list[self.drawpoint_calls % self.num_styles]
        graph.style.bar.drawpoint(self, privatedata, sharedata, agraph, point)
        privatedata.barattrs = savebarattrs
        self.drawpoint_calls += 1


g = graph.graphxy(width=8, x=graph.axis.bar())
style1 = [pyx.color.rgb.red, deco.stroked([color.grey.black, style.linewidth.THICK])]
style2 = [pyx.color.rgb.blue, deco.stroked([color.grey.black])]
g.plot(graph.data.list([["a", 1], ["b", 5], ["c", 9]], xname=1, y=2),
       [bar_styles([style1]*2+[style2])])
g.writeEPSfile("c:\\temp.eps")