Hi Axel, I pretty much like the idea. However I suggest to set the decorator to deco.earrow as the default. See changeset 3036.
Best, André Am 04.12.2010 um 14:32 schrieb Axel Freyn: > 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 > > ------------------------------------------------------------------------------ > What happens now with your Lotus Notes apps - do you make another costly > upgrade, or settle for being marooned without product support? Time to move > off Lotus Notes and onto the cloud with Force.com, apps are easier to build, > use, and manage than apps on traditional platforms. Sign up for the Lotus > Notes Migration Kit to learn more. http://p.sf.net/sfu/salesforce-d2d > _______________________________________________ > PyX-user mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/pyx-user -- by _ _ _ Dr. André Wobst, Amselweg 22, 85716 Unterschleißheim / \ \ / ) [email protected], http://www.wobsta.de/ / _ \ \/\/ / PyX - High quality PostScript and PDF figures (_/ \_)_/\_/ with Python & TeX: visit http://pyx.sourceforge.net/
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