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

[Nicolas P. R. <Nic...@in...>]

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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