Wunderbar! Thank you André
Hans
On Sat, May 11, 2013 at 5:13 PM, André Wobst
<[email protected]>wrote:
> Hans,
>
> Hmmm. Yes, this is a bug. You're really doing quite a hard test on our
> internals ... :-)
>
> What happens here, is that the curvedtext decorator actually does not
> apply the mirror trafo at all. The curved text decorator works by reading
> all text items (each character is typeset for itself due to an internal
> "singlecharmode") and applies a trafo to each character depending on its
> position on the path. By that, all global transformations become ignored
> (!!!), as they have been applied to the text items globally and are not
> taken into account while reading the characters one by one. If I'm right,
> we just need to apply the trafos to each character, and this can be done by
> the following patch:
>
> andre@mbp:~/python/pyx$ svn diff pyx/deco.py
> Index: pyx/deco.py
> ===================================================================
> --- pyx/deco.py (revision 3340)
> +++ pyx/deco.py (working copy)
> @@ -610,13 +610,15 @@
> t = texrunner.text(0, 0, self.text, textattrs,
> singlecharmode=1)
> t.ensuredvicanvas()
>
> + texttrafos = attr.getattrs(textattrs, [trafo.trafo_pt])
> +
> c = canvas.canvas()
> for item in t.dvicanvas.items:
> bbox = item.bbox()
> if bbox:
> x = item.bbox().center()[0]
> atrafo = dp.path.trafo(textpos+x)
> - c.insert(item, [trafo.translate(-x, 0), atrafo])
> + c.insert(item, [trafo.translate(-x, 0)] + texttrafos
> + [atrafo])
> if self.exclude is not None:
> dp.excluderange(textpos+bbox.left()-self.exclude,
> textpos+bbox.right()+self.exclude)
> else:
>
> I just submitted this fix in changeset 3348.
>
> I wonder if you find other issues with this y-axis inversion. We'll see,
> good luck!
>
> Best,
>
>
> André
>
>
> Am 11.05.2013 um 23:26 schrieb Hans L:
>
> > Ok,your example works. It appears that my issue is specifically with
> curved text. Transformations do not seem to apply at all.
> >
> > Here is a modified example from
> http://pyx.sourceforge.net/examples/text/textalongpath.html
> >
> > from pyx import *
> >
> > c = canvas.canvas(attrs=[trafo.mirror()])
> >
> > p = path.path(path.moveto(-2, 0), path.curveto(-1, 0, -1, 1, 0, 1),
> path.curveto(1, 1, 1, 0, 2, 0))
> >
> > c.stroke(p, [deco.curvedtext("\PyX{} is fun!",
> textattrs=[trafo.mirror()]),
> > deco.curvedtext("left", textattrs=[text.halign.left,
> text.vshift.mathaxis, trafo.mirror()], arclenfrombegin=0.5, exclude=0.1),
> > deco.curvedtext("right", textattrs=[text.halign.right,
> text.vshift.mathaxis, trafo.mirror()], arclenfromend=0.5, exclude=0.1)])
> >
> > c.writePDFfile("textalongpath")
> >
> >
> > Is this a bug?
> >
> >
> >
> > On Sat, May 11, 2013 at 4:00 PM, André Wobst <
> [email protected]> wrote:
> > Hans,
> >
> > Sorry, I should have read your question more carefully.
> >
> > Well, there's probably no other options than applying transformations. A
> simple example works rather well:
> >
> > from pyx import *
> > c = canvas.canvas([trafo.mirror()])
> > c.stroke(path.line(0, 0, 2, 2))
> > c.text(1, 1, "Hello, world!", [trafo.mirror()])
> > c.writePDFfile()
> >
> > Unfortunately, we don't have a hook to apply the mirror trafo to all
> text boxes. You may define you some convenience method or alter the
> texrunner instance ... it probably depends on the use-case what is best.
> >
> >
> > André
> >
> >
> > Am 11.05.2013 um 22:42 schrieb Hans L:
> >
> > > I'm not using graphs specifically, I just mean to flip the y
> orientation of general rendering to a canvas.
> > >
> > > Hans
> > >
> > >
> > > On Sat, May 11, 2013 at 3:34 PM, André Wobst <
> [email protected]> wrote:
> > > Hi Hans,
> > >
> > > You can use the reverse flag of the axis, see
> http://pyx.sourceforge.net/manual/axis.html#graph.axis.axis.linear, or
> fix the axis range manually and set max to be smaller than min (which
> sounds a little crazy, but it perfectly does the trick as well).
> > >
> > > HTH, André
> > >
> > > Am 11.05.2013 um 21:55 schrieb Hans L:
> > >
> > > > Hello, I am new to using PyX and was wondering if it is possible to
> invert the Y axis so the top left of page is 0,0 and the y value increases
> as you go towards the bottom of the page?
> > > >
> > > > I experimented with passing a trafo to the canvas constructor:
> > > > trafo.trafo(matrix=((1, 0), (0, -1)), vector=(0, canvasheight))
> > > >
> > > > This seems to work ok for graphics, but then of course all text is
> upside down.
> > > > I tried applying a similar y flipping transformation to the
> textattrs to upright it again, but it did not seem to do anything.
> > > >
> > > > Is there any simple solution to this?
> > > >
> > > > Thanks,
> > > > Hans
> > > >
> > > >
> ------------------------------------------------------------------------------
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> > > --
> > > 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/
> > >
> > >
> >
> > --
> > 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/
> >
> >
>
> --
> 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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their applications. This 200-page book is written by three acclaimed
leaders in the field. The early access version is available now.
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