#42 graph.pos method seems broken

[Dominic Ford]

The attached code snippet works fine with PyX 0.7.1,
but fails with PyX 0.8.1:

---

Traceback (most recent call last):
File "pyx_pos.py", line 19, in ?
x,y = g.pos(x=0,y=0)
File
"/usr/local/lib/python2.4/site-packages/pyx/graph/graph.py",
line 169, in pos
return self.xpos + xaxis.convert(x)self.width,
self.ypos + yaxis.convert(y)self.height
File
"/usr/local/lib/python2.4/site-packages/pyx/graph/axis/axis.py",
line 472, in convert
assert self.canvas is not None, self.errorname
AssertionError: x

---

I believe the cause of this is that the syntax of the
method "convert" has changed in the file
graph/axis/axis.py, but the pos method in the file
graph/graph.py has not been updated to reflect this change.

[Dominic Ford]

Demonstration code snippet

[Andre Wobst]

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user_id=405853

Sorry, that's not a bug but a problem due to the anchored axes as introduced
in PyX 0.8 internally. You need to access the axes by g.axes["x"] and
g.axes["y"], since only by that they have access to the graphs internal data
(like the axes ranges ... you can use the original axis instances multiple times
now). Adjusted the manual in changeset:2769.