Re: [matplotlib-devel] Incorporating TikZ into Matplotlib

[Benjamin Reedlunn]

Neil, I have attached code to draw the arrowhead. -Ben

# -*- coding: utf-8 -*-
"""
Spyder Editor

This is a temporary script file.
"""

import custom_annotations
import matplotlib.pyplot as plt

plt.figure()
ax = plt.subplot(111)
length = 20.0
head_length = 7.0
#Convert the head length from mm into points (1/72")
head_length_pts = head_length * 72.0/25.4
#Calculate the head width
head_aspect_ratio = 2.5
head_width_pts = head_length_pts / head_aspect_ratio
#Define arrow style
style_str = '-)>'
arrowstyle_str = style_str + ', head_width = ' + str(head_width_pts) + \
    ', head_length = ' + str(head_length_pts) + ', length = ' + str(length * 72/25.4)
#Sets arrow orientation
x_1 = [0.25, 0.5]
#Sets arrowhead tip position
x_2 = [0.5, 0.5]
ax.annotate('', xytext = x_1, textcoords = 'axes fraction', \
    xy = x_2, xycoords = 'axes fraction', clip_on = False, \
    arrowprops = dict(arrowstyle = arrowstyle_str, mutation_scale = 1.0, \
    linewidth = 1, facecolor = [0,0,0], connectionstyle = 'arc3', \
    shrinkA = 0, shrinkB = 0))

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 ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y_______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y_______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel

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