On Τρι, 2009-05-12 at 17:56 +0200, Michael SCHINDLER wrote:
> Rehello,
>
> On 12.05.09, Giorgos Logiotatidis wrote:
> > I use pyx library to hack a python parser of a network map. I based my
> > work on this [1] example. I 'm searching for a way to label the arcs
> > connecting the nodes but I haven't managed to find anything since it's
> > the first time I use pyx and looks really complicated. Does anyone know
> > a way to do this?
>
> There is a path decorator, ready-made for this purpose. It is called
> deco.text. Look at the following example, which accounts for the
> proper angle of the path at the point where the label is attached:
>
>
> from pyx import *
> from math import atan2, degrees
>
> p = path.curve(0, 0, 1, 1, 2, 0, 4, 0)
> x, y = p.at(0.5*p.arclen())
> angle = degrees(atan2(*p.trafo(0.5*p.arclen()).apply_pt(0,1)))
>
> c = canvas.canvas()
> c.stroke(path.circle(x, y, 0.01))
> c.stroke(p, [deco.text("label", textattrs=[text.halign.left], textdist=0.2,
> angle=angle)])
> c.writePDFfile("foo")
>
>
> Michael
>
Thank you both for the answers. The text decoration Michael proposed
worked fine!
Cheers,
Giorgos
--
---------------------------------------
Giorgos Logiotatidis
http://www.sealabs.net/seadog
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