Thanks, it works!
I needed to add:
import matplotlib.patches
to one file and
plt.show()
to the other.
Any word on the locations in the code of the seven arrow drawing methods?
I've located the arrow drawing code in tikz, and so I can start porting it
over. I'm curious, do we know the linewidth of the edge being decorated by
the arrow? To make arrows scale nicely, most of the arrow dimensions are
given in two pieces: an absolute value (in points for example) and a line
width factor. The dimension is the absolute value plus the line width
factor times the line width. The TikZ manual explains: "This makes it easy
to vary the size of an arrow tip in accordance with the line width –
usually a very good idea since thicker lines will need thicker arrow tips."
Best,
Neil
On Wed, May 13, 2015 at 10:07 PM, Benjamin Reedlunn <breed...@gmail.com>
wrote:
> Neil,
>
> I have attached code to draw the arrowhead.
>
> -Ben
>
>
>
> On May 13, 2015, at 7:44 PM, Neil Girdhar <mistersh...@gmail.com> wrote:
>
> 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 <breed...@gmail.com>
> 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 <tcasw...@gmail.com> 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 <mistersh...@gmail.com>
>> 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 <efir...@hawaii.edu> 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 <efir...@hawaii.edu
>>>>> <mailto:efir...@hawaii.edu>> 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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