Hi André,
On Fri, Dec 03, 2010 at 10:18:28PM +0100, André Wobst wrote:
> The solution Axel proposed in this thread is the way to go. However,
> you may just copy the whole arrow style and remove all arrow stuff
> from it keeping the lines only.
>
> While I think we should not allow for size=None in the arrow
> decorator, I don't see any particular problem to allow arrowsize=0 in
> the graph.arrow style for a very simple solution to your problem. I
> submitted a patch in changeset 3034, so in case you use the SVN
> version of PyX, just update, set arrowsize to None and you're done.
Yesterday evening, I was also wondering about another possible solution:
I would propose to add the possibility to pass an arbitrary decorator to
plot-style's constructor. In the actual style, I don't see a
possibility to:
- reverse the direction of the arrow
- change the position where the arrowhead is added
- change the constriction of the arrowhead
- change the opening-angle of the arrowhead
However, by adding an additional parameter to the constructor of
"graph.style.arrow"
def __init__(self, linelength=0.25*unit.v_cm, arrowsize=0.15*unit.v_cm,
lineattrs=[], arrowattrs=[], arrowpos=0.5, epsilon=1e-5, decorator = None):
self.decorator = decorator
...
And then implementing drawpoint as
if self.decorator:
privatedata.arrowcanvas.stroke(path.line_pt(x1, y1, x2, y2),
privatedata.lineattrs + self.decorator)
else:
privatedata.arrowcanvas.stroke(path.line_pt(x1, y1, x2, y2),
privatedata.lineattrs +
[deco.earrow(privatedata.arrowattrs, size=self.arrowsize*size)])
there would be three possibilities giving maximal flexibility:
- One passes no decorator: the arrow-class behaves as before
- One passes "decorator = []": no arrows are plotted at all
- One passes "decorator = [deco.earrow(....)]": An arbitrary arrow can
be added (e.g. also the angle of the arrow can be changed from 45°).
- One even could add more then one arrow-head to each line...
What do you think about this changement?
Axel
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