[Extension] Parametric Plotter

[Tattsan]

Function plotter extension is useful.
But we couldn't plot parametric curves.
I modified funcplot.py and funcplot.inx in order to draw parametric
curves.

[Tattsan (tattsan)]

Originator: YES

File Added: paramplot.inx

[Buliabyak-users (buliabyak-users)]

Originator: NO

Thank you - but in SVN we have switched our effects from PyXML to lxml, so
your extension won't work as is. Can you please download an SVN build and
make it work with it? The changes should be simple enough I think, just
look up in other effects how they are done.

Also, can you please expand the Help tab with an explanation of what is
parametric curve and how it changes from the regular function graph?

Final question - is this possible to merge this all back to function
plotter so that one could use both regular and parametric from the same UI,
with a toggle in the dialog?

[Tattsan (tattsan)]

Originator: YES

Hi.

> Can you please download an SVN build and make it work with it?

I downloaded the trunk version, and tried the original function
plotter. But I get a TypeError as following.

> File "/usr/local/share/inkscape/extensions/funcplot.py", line 115, in
drawfunction
> dy0 = (y1 - y0)/ds
> TypeError: unsupported operand type(s) for -: 'str' and 'str'

The version of lxml library I've installed is 1.3.3.
Does any other libraries required?

>Also, can you please expand the Help tab with an explanation of what is
>parametric curve and how it changes from the regular function graph?

All right.

>Final question - is this possible to merge this all back to function
>plotter so that one could use both regular and parametric from the same
UI,
>with a toggle in the dialog?

I don't know whether it is easy or not for me:-)

[Buliabyak-users (buliabyak-users)]

Originator: NO

Yes, the funcplot in svn seems broken - sorry, we have a really hectic
rate of development these days, if you can fix funcplot it will be very
much appreciated. I also sent a request for help to the devel list.

[Buliabyak-users (buliabyak-users)]

Originator: NO

ok, now the function plotter works in svn, so you can make yours work with
svn too

[jazzynico (jazzynico)]

A parametric plotter extension is already available as of Inkscape 0.47 (Extensions>Render>Parametric Curves).
It's not exactly the same code as yours, so feel free to comment or send a patch if you think there are things that can be improved in the released one.