Re: [matplotlib-devel] Incorporating TikZ into Matplotlib

[Thomas C. <tca...@gm...>]

The other thing that should be done is to unify the (I think 7?!?) unique
ways to draw arrows in mpl.

On Wed, May 13, 2015 at 4:52 PM Neil Girdhar <mis...@gm...> wrote:

> Yes, I just noticed that as well.  That's how the tikz pgf code looks (a
> sequence of line_to and curve_to commands and so on) so it should be easy
> to port over the various shapes.
>
> On Wed, May 13, 2015 at 4:49 PM, Eric Firing <ef...@ha...> wrote:
>
>> On 2015/05/13 10:12 AM, Neil Girdhar wrote:
>>
>>> If you want to make arrowheads look at all decent, they really need to
>>> be enclosed in Bezier curves.  See the diagram here:
>>>
>>
>> Mpl paths support Bezier curves.
>> http://matplotlib.org/api/path_api.html?highlight=bezier
>>
>>
>>>
>>> http://tex.stackexchange.com/questions/150289/how-do-you-accomplish-stealth-with-the-new-arrows-meta/230965#230965
>>>
>>> The first two look like garbage.  The last one is the only one that
>>> looks good imho.
>>>
>>
>> That depends on the application, and the observer.
>
>
> Sure, but I may as well port them all of the tikz arrowheads over since
> most of the work would be figuring out how to do it.
>
>
>>
>>
>> Eric
>>
>>
>>> Best,
>>>
>>> Neil
>>>
>>> On Wed, May 13, 2015 at 4:09 PM, Eric Firing <ef...@ha...
>>> <mailto:ef...@ha...>> wrote:
>>>
>>>     On 2015/05/13 9:36 AM, Neil Girdhar wrote:
>>>
>>>         I don't know matplotlib well enough (yet) to know what the
>>>         change would
>>>         consist of.
>>>
>>>         I suggest you take a look at the beautiful tikz manual:
>>>         http://pgf.sourceforge.net/pgf_CVS.pdf
>>>
>>>
>>>     Very helpful, thank you.
>>>
>>>
>>>         The arrows.meta on page 201–212 are really well-designed and
>>>         beautiful.
>>>
>>>         Compare this with matplotlib's custom arrows:
>>>
>>> http://stackoverflow.com/questions/16968007/custom-arrow-style-for-matplotlib-pyplot-annotate
>>>
>>>         How do I make tikz's arrowheads available for all backends?
>>>
>>>
>>>     My guess offhand is that this is a matter of using the mpl API.  I
>>>     don't think we would want to add all of these types and options to
>>>     the mpl core; but a toolkit might be ideal for this.  The mpl API,
>>>     which generates the same results for all backends, is quite complete
>>>     and flexible.  Things like arrowheads are Patch objects, and you can
>>>     specify any path you want.  The main trick is figuring out how to
>>>     handle transforms--what kind of coordinates should the path be
>>>     specifying?  How should things scale as a figure is reshaped and
>>>     resized?
>>>
>>>     For many of these types you could also use mpl Line2D objects, for
>>>     which several properties including cap style can be specified.  Not
>>>     all of the TikZ options would be available, but perhaps enough.
>>>
>>>     Eric
>>>
>>>
>>>
>>
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