Re: [matplotlib-devel] Incorporating TikZ into Matplotlib

[Neil G. <mis...@gm...>]

Do you have the code that you used to draw the arrowhead?  I'm up to date
now on the development workflow (
http://matplotlib.org/devel/gitwash/development_workflow.html), so I'm
ready to start working.

Thanks,

Neil

On Wed, May 13, 2015 at 9:10 PM, Benjamin Reedlunn <bre...@gm...>
wrote:

> Yes, I fully agree that we need to unify the many different ways to draw
> arrows.
>
> Neil, in case an example would be helpful for you, I have attached a
> module that includes a custom arrowhead class.  The arrowhead class works
> with the with the ax.annotate() method.  (I like the annotate method
> because it allows me to easily mix and match coordinate systems for arrow
> placement.)  As you can see in the attached pdf, the custom arrowhead
> doesn't include fancy Bezier curves, but that could be added.
>
> -Ben
>
>
>
> On May 13, 2015, at 2:54 PM, Thomas Caswell <tca...@gm...> wrote:
>
> 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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