Re: [Matplotlib-users] Are matplotlib paths equivalent to svg paths?

[Jason M. <moo...@gm...>]

Ahh! Yes that is likely it. I assumed that relative dimensions were always
with respect to the previous point, but they are always with respect to the
previous non-control point.

Thanks!


Jason
moorepants.info
+01 530-601-9791

On Wed, Mar 4, 2015 at 10:36 PM, Nicolas P. Rougier <
Nic...@in...> wrote:

>
> Actually, both syntax are valid.
>
> I think the problem in you svg parser is that you're changing the
> reference point each time you iterate in points.
>
> For example consider the path:
>
> m 100,200 c 100,100 400,100 400,200 z  => (m P0 c P1 P2 P3 z)
>
> Your parser ended with vertex at (100.0, -200.0), (200.0, -300.0), (600.0,
> -400.0), (1000.0, -600.0)
>
> which corresponds to [P0, P0+P1, P1+P2, P2+P3] but you want [P0, P0+P1,
> P0+P2, P0+P3]
>
>
> Nicolas
>
>
> > On 05 Mar 2015, at 00:35, Jason Moore <moo...@gm...> wrote:
> >
> > Actually the notation I have is valid SVG path data. Your script could
> be modified to handle the more general forms, see:
> >
> > http://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation
> >
> > But this still doesn't answer why the smoothness is different between
> the SVG and matploblib paths. I haven't been able to figure that out yet.
> >
> >
> > Jason
> > moorepants.info
> > +01 530-601-9791
> >
> > On Wed, Mar 4, 2015 at 2:32 PM, Jason Moore <moo...@gm...>
> wrote:
> > Thanks Nicolas for your code.
> >
> > The difference in what I have and what you share is in the svg path
> specification. For some reason Inkscape outputs a single leading "c" for
> the bezier curve in my path whereas your path has a "c" for every three
> points. I'm not quite sure the difference, maybe Inkscape outputs a
> non-standard form.
> >
> >
> > Jason
> > moorepants.info
> > +01 530-601-9791
> >
> > On Wed, Mar 4, 2015 at 1:53 PM, Nicolas P. Rougier <
> Nic...@in...> wrote:
> >
> > Here is a (limited) SVG path parser I made some time ago:
> >
> >
> https://github.com/rougier/LinuxMag-HS-2014/blob/master/matplotlib/firefox.py
> >
> >
> > The svg_parse function might just do what you're trying to achieve.
> >
> >
> > Nicolas
> >
> > > On 04 Mar 2015, at 20:51, Jason Moore <moo...@gm...> wrote:
> > >
> > > Hi,
> > >
> > > I have some SVGs with closed Bezier curve paths that I'd like to
> convert to matplotlib paths.
> > >
> > > For example, here is some code:
> https://gist.github.com/moorepants/4cac02e798446bb46de7
> > >
> > > The above script runs but the resulting path in matplotlib is less
> smooth that when opened in inkscape, for example. I've attached screenshots.
> > >
> > > I'm not sure why there is a difference.
> > >
> > > Any suggestions to get my matplotlib curves looking as smooth as they
> do in SVG format?
> > >
> > > Jason
> > > moorepants.info
> > > +01 530-601-9791
> > >
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