Wow, this looks great.
Thank you all of you so far for the quick responses and pointers.
I've already done many diagrams in Python-generated TikZ, which I want to
port over to pure Python. They are basically variants of this:
http://www.texample.net/tikz/examples/graph/ . Do you think this will be
possible? That is, drawing nodes with labels inside and then anchoring the
arrows to the edges of the nodes?
With respect to the unification of arrow types, would you be able to point
me to which files or methods in the source they are based on? I would like
to familiarize myself with all of them before I make a proposal of what I
intend to do.
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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