Re[2]: [PyX-user] Graph drawing stuff

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

OK, this basically works.

Thanks,
Alan


from pyx import *

text.reset()
text.set(mode=3D'latex')
#unit.set(uscale=3D2)
unit.set(defaultunit=3D'cm')

class Node:

=09def __init__(self, canvas, x, y, label, radius=3D0.25*unit.t_cm):
=09=09self.box =3D canvas.text(x, y, label,[ text.halign.center,
=09=09=09=09=09=09  text.valign.middle])
=09=09canvas.stroke(path.circle(x, y, radius))
=09=09self.radius =3D radius
=09=09self.x =3D x
=09=09self.y =3D y
=09=09# XXX Bogus null-box for use with connectors:
=09=09# self.center =3D box.rect(x, y, 0, 0)

class Edge:
=09def __init__(self, canvas, source, target, *args, **kwds):
=09=09connclass =3D kwds.get('connclass', connector.line)
=09=09self.source =3D source
=09=09self.target =3D target
=09=09self.conn =3D connclass(source.box, target.box,
=09=09=09=09=09=09=09  # XXX Add half the width of the circle
=09=09=09=09=09=09=09  # path:
=09=09=09=09=09=09=09  boxdists=3D[source.radius, target.radius])
=09=09canvas.stroke(self.conn, *args)

def drawNodes(canvas):
=09A =3D Node(c, 0, 1, '$a$')
=09B =3D Node(c, 0, 0, '$b$')
=09T =3D Node(c, 1, 1, '$t$')
=09C =3D Node(c, 1, 0, '$c$')
=09return A, B, T, C

c =3D canvas.canvas()
A, B, T, C =3D drawNodes(c)
for X, Y in [[A, T], [A, C], [B, C]]:
=09Edge(c, X, Y, [style.linestyle.dashed,
=09=09 #deco.earrow.normal(style.linestyle.solid))
=09=09 deco.earrow.normal([deco.stroked.clear])])

c.writeEPSfile('c:/temp/temp.eps')