From: Andre Wobst <wobsta@us...>  20050411 07:01:07

Hi, sorry for my late response (to this and the other mails I'll answer today). I was in Vienna last week ... ;) On 05.04.05, Michael Strass wrote: > So here is my problem: I want to plot 4 data sets in one graph also > displaying a legend. So I use the class key for this purpose. It seems > to me from reading the _reference_ manual that you can only arrange the > key entries vertically that means in one column. Due the space left > inside my graph it would be better to have two rows with two columns. > How does it work, if at all? The current graph key class does not allow you to do so. However you can use your own graph key class. And its even not that complicated since you can use the existing key each of the columns. Thats why we do all this component architecture in the graph system! A modifed version of the piaxis example would be: from math import pi from pyx import * from pyx.graph import axis class columnkey: def __init__(self, columns=2, dist=0.5*unit.v_cm, subkey=graph.key.key(), border=0.3*unit.v_cm, keyattrs=None): self.columns = columns self.dist = dist self.subkey = subkey self.border = border self.keyattrs = keyattrs # copy some config features from the subkey # TODO: the positioning config should be moved into the graph self.hinside = subkey.hinside self.vinside = subkey.vinside self.hdist = subkey.hdist self.vdist = subkey.vdist self.hpos = subkey.hpos self.vpos = subkey.vpos def paint(self, plotitems): dist_pt = unit.topt(self.dist) c = canvas.canvas() plotitems = [plotitem for plotitem in plotitems if plotitem.gettitle() is not None] itemspercolumn = (len(plotitems) + self.columns  1) // self.columns x_pt = 0 while plotitems: subc = self.subkey.paint(plotitems[:itemspercolumn]) c.insert(subc, [trafo.translate_pt(x_pt, 0)]) x_pt += unit.topt(subc.bbox().width()) + dist_pt del plotitems[:itemspercolumn] if self.keyattrs is not None: newc = canvas.canvas() newc.draw(c.bbox().enlarged(self.border).path(), self.keyattrs) newc.insert(c) c = newc return c g = graph.graphxy(width=8, key=columnkey(), x=axis.linear(min=0, max=2*pi, title="$x$", divisor=pi, texter=axis.texter.rational(suffix=r"\pi")), y=axis.linear(title="$y$")) g.plot(graph.data.function("y=sin(x)", title=r"$\sin(x)$")) g.plot(graph.data.function("y=cos(x)", title=r"$\cos(x)$")) g.plot(graph.data.function("y=sin(x+pi)", title=r"$\sin(x+\pi)$")) g.plot(graph.data.function("y=cos(x+pi)", title=r"$\cos(x+\pi)$")) g.finish() g.stroke(g.ygridpath(0)) g.writeEPSfile("piaxis") I would like to add this to the CVS for 0.8, but I don't really like the name. Does anybody has a better name for columnkey? André  by _ _ _ Dr. André Wobst / \ \ / ) wobsta@..., http://www.wobsta.de/ / _ \ \/\/ / PyX  High quality PostScript figures with Python & TeX (_/ \_)_/\_/ visit http://pyx.sourceforge.net/ 