-
Notifications
You must be signed in to change notification settings - Fork 60
Expand file tree
/
Copy pathMEP26.html
More file actions
860 lines (656 loc) · 45.5 KB
/
MEP26.html
File metadata and controls
860 lines (656 loc) · 45.5 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" />
<title>MEP26: Artist styling — Matplotlib 3.8.3 documentation</title>
<script data-cfasync="false">
document.documentElement.dataset.mode = localStorage.getItem("mode") || "";
document.documentElement.dataset.theme = localStorage.getItem("theme") || "light";
</script>
<!-- Loaded before other Sphinx assets -->
<link href="../../_static/styles/theme.css?digest=e353d410970836974a52" rel="stylesheet" />
<link href="../../_static/styles/bootstrap.css?digest=e353d410970836974a52" rel="stylesheet" />
<link href="../../_static/styles/pydata-sphinx-theme.css?digest=e353d410970836974a52" rel="stylesheet" />
<link href="../../_static/vendor/fontawesome/6.1.2/css/all.min.css?digest=e353d410970836974a52" rel="stylesheet" />
<link rel="preload" as="font" type="font/woff2" crossorigin href="../../_static/vendor/fontawesome/6.1.2/webfonts/fa-solid-900.woff2" />
<link rel="preload" as="font" type="font/woff2" crossorigin href="../../_static/vendor/fontawesome/6.1.2/webfonts/fa-brands-400.woff2" />
<link rel="preload" as="font" type="font/woff2" crossorigin href="../../_static/vendor/fontawesome/6.1.2/webfonts/fa-regular-400.woff2" />
<link rel="stylesheet" type="text/css" href="../../_static/pygments.css?v=fa44fd50" />
<link rel="stylesheet" type="text/css" href="../../_static/css/style.css?v=86e00652" />
<link rel="stylesheet" type="text/css" href="../../_static/graphviz.css?v=eafc0fe6" />
<link rel="stylesheet" type="text/css" href="../../_static/plot_directive.css" />
<link rel="stylesheet" type="text/css" href="../../_static/copybutton.css?v=76b2166b" />
<link rel="stylesheet" type="text/css" href="../../_static/sg_gallery.css?v=61a4c737" />
<link rel="stylesheet" type="text/css" href="../../_static/sg_gallery-binder.css?v=f4aeca0c" />
<link rel="stylesheet" type="text/css" href="../../_static/sg_gallery-dataframe.css?v=2082cf3c" />
<link rel="stylesheet" type="text/css" href="../../_static/sg_gallery-rendered-html.css?v=1277b6f3" />
<link rel="stylesheet" type="text/css" href="../../_static/design-style.1e8bd061cd6da7fc9cf755528e8ffc24.min.css?v=0a3b3ea7" />
<link rel="stylesheet" type="text/css" href="../../_static/mpl.css?v=c5620d72" />
<!-- Pre-loaded scripts that we'll load fully later -->
<link rel="preload" as="script" href="../../_static/scripts/bootstrap.js?digest=e353d410970836974a52" />
<link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=e353d410970836974a52" />
<script src="../../_static/documentation_options.js?v=db1eed5b"></script>
<script src="../../_static/doctools.js?v=888ff710"></script>
<script src="../../_static/sphinx_highlight.js?v=dc90522c"></script>
<script src="../../_static/clipboard.min.js?v=a7894cd8"></script>
<script src="../../_static/copybutton.js?v=ccdb6887"></script>
<script src="../../_static/design-tabs.js?v=36754332"></script>
<script data-domain="matplotlib.org" defer="defer" src="https://views.scientific-python.org/js/script.js"></script>
<script>DOCUMENTATION_OPTIONS.pagename = 'devel/MEP/MEP26';</script>
<script>
DOCUMENTATION_OPTIONS.theme_switcher_json_url = 'https://matplotlib.org/devdocs/_static/switcher.json?v3.8.3-2-g6175ebf59d';
DOCUMENTATION_OPTIONS.theme_switcher_version_match = '3.8.3';
</script>
<link rel="canonical" href="https://matplotlib.org/stable/devel/MEP/MEP26.html" />
<link rel="search" type="application/opensearchdescription+xml"
title="Search within Matplotlib 3.8.3 documentation"
href="../../_static/opensearch.xml"/>
<link rel="icon" href="../../_static/favicon.ico"/>
<link rel="search" title="Search" href="../../search.html" />
<link rel="next" title="MEP27: Decouple pyplot from backends" href="MEP27.html" />
<link rel="prev" title="MEP25: Serialization" href="MEP25.html" />
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<meta name="docsearch:language" content="en"/>
</head>
<body data-bs-spy="scroll" data-bs-target=".bd-toc-nav" data-offset="180" data-bs-root-margin="0px 0px -60%" data-default-mode="">
<a class="skip-link" href="#main-content">Skip to main content</a>
<input type="checkbox"
class="sidebar-toggle"
name="__primary"
id="__primary"/>
<label class="overlay overlay-primary" for="__primary"></label>
<input type="checkbox"
class="sidebar-toggle"
name="__secondary"
id="__secondary"/>
<label class="overlay overlay-secondary" for="__secondary"></label>
<div class="search-button__wrapper">
<div class="search-button__overlay"></div>
<div class="search-button__search-container">
<form class="bd-search d-flex align-items-center"
action="../../search.html"
method="get">
<i class="fa-solid fa-magnifying-glass"></i>
<input type="search"
class="form-control"
name="q"
id="search-input"
placeholder="Search the docs ..."
aria-label="Search the docs ..."
autocomplete="off"
autocorrect="off"
autocapitalize="off"
spellcheck="false"/>
<span class="search-button__kbd-shortcut"><kbd class="kbd-shortcut__modifier">Ctrl</kbd>+<kbd>K</kbd></span>
</form></div>
</div>
<nav class="bd-header navbar navbar-expand-lg bd-navbar">
<div class="bd-header__inner bd-page-width">
<label class="sidebar-toggle primary-toggle" for="__primary">
<span class="fa-solid fa-bars"></span>
</label>
<div class="navbar-header-items__start">
<div class="navbar-item">
<a class="navbar-brand logo" href="https://matplotlib.org/stable/">
<img src="../../_static/logo_light.svg" class="logo__image only-light" alt="Logo image"/>
<script>document.write(`<img src="../../_static/logo_dark.svg" class="logo__image only-dark" alt="Logo image"/>`);</script>
</a></div>
</div>
<div class="col-lg-9 navbar-header-items">
<div class="me-auto navbar-header-items__center">
<div class="navbar-item"><ul id="navbar-main-elements" class="navbar-nav">
<li class="nav-item">
<a class="reference internal nav-link" href="../../plot_types/index.html">Plot types</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../../users/index.html">User guide</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../../tutorials/index.html">Tutorials</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../../gallery/index.html">Examples</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../../api/index.html">Reference</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../index.html">Contribute</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../../users/release_notes.html">Releases</a>
</li>
</ul></div>
</div>
<div class="navbar-header-items__end">
<div class="navbar-item navbar-persistent--container">
<script>
document.write(`
<button class="btn btn-sm navbar-btn search-button search-button__button" title="Search" aria-label="Search" data-bs-placement="bottom" data-bs-toggle="tooltip">
<i class="fa-solid fa-magnifying-glass"></i>
</button>
`);
</script>
</div>
<div class="navbar-item">
<script>
document.write(`
<button class="theme-switch-button btn btn-sm btn-outline-primary navbar-btn rounded-circle" title="light/dark" aria-label="light/dark" data-bs-placement="bottom" data-bs-toggle="tooltip">
<span class="theme-switch" data-mode="light"><i class="fa-solid fa-sun"></i></span>
<span class="theme-switch" data-mode="dark"><i class="fa-solid fa-moon"></i></span>
<span class="theme-switch" data-mode="auto"><i class="fa-solid fa-circle-half-stroke"></i></span>
</button>
`);
</script></div>
<div class="navbar-item">
<script>
document.write(`
<div class="version-switcher__container dropdown">
<button type="button" class="version-switcher__button btn btn-sm navbar-btn dropdown-toggle" data-bs-toggle="dropdown">
stable <!-- this text may get changed later by javascript -->
<span class="caret"></span>
</button>
<div class="version-switcher__menu dropdown-menu list-group-flush py-0">
<!-- dropdown will be populated by javascript on page load -->
</div>
</div>
`);
</script></div>
<div class="navbar-item"><ul class="navbar-icon-links navbar-nav"
aria-label="Icon Links">
<li class="nav-item">
<a href="https://gitter.im/matplotlib/matplotlib" title="Gitter" class="nav-link" rel="noopener" target="_blank" data-bs-toggle="tooltip" data-bs-placement="bottom"><span><i class="fa-brands fa-gitter"></i></span>
<label class="sr-only">Gitter</label></a>
</li>
<li class="nav-item">
<a href="https://discourse.matplotlib.org" title="Discourse" class="nav-link" rel="noopener" target="_blank" data-bs-toggle="tooltip" data-bs-placement="bottom"><span><i class="fa-brands fa-discourse"></i></span>
<label class="sr-only">Discourse</label></a>
</li>
<li class="nav-item">
<a href="https://github.com/matplotlib/matplotlib" title="GitHub" class="nav-link" rel="noopener" target="_blank" data-bs-toggle="tooltip" data-bs-placement="bottom"><span><i class="fa-brands fa-github"></i></span>
<label class="sr-only">GitHub</label></a>
</li>
<li class="nav-item">
<a href="https://twitter.com/matplotlib/" title="Twitter" class="nav-link" rel="noopener" target="_blank" data-bs-toggle="tooltip" data-bs-placement="bottom"><span><i class="fa-brands fa-twitter"></i></span>
<label class="sr-only">Twitter</label></a>
</li>
</ul></div>
</div>
</div>
<div class="navbar-persistent--mobile">
<script>
document.write(`
<button class="btn btn-sm navbar-btn search-button search-button__button" title="Search" aria-label="Search" data-bs-placement="bottom" data-bs-toggle="tooltip">
<i class="fa-solid fa-magnifying-glass"></i>
</button>
`);
</script>
</div>
<label class="sidebar-toggle secondary-toggle" for="__secondary">
<span class="fa-solid fa-outdent"></span>
</label>
</div>
</nav>
<div class="bd-container">
<div class="bd-container__inner bd-page-width">
<div class="bd-sidebar-primary bd-sidebar">
<div class="sidebar-header-items sidebar-primary__section">
<div class="sidebar-header-items__center">
<div class="navbar-item"><ul id="navbar-main-elements" class="navbar-nav">
<li class="nav-item">
<a class="reference internal nav-link" href="../../plot_types/index.html">Plot types</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../../users/index.html">User guide</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../../tutorials/index.html">Tutorials</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../../gallery/index.html">Examples</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../../api/index.html">Reference</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../index.html">Contribute</a>
</li>
<li class="nav-item">
<a class="reference internal nav-link" href="../../users/release_notes.html">Releases</a>
</li>
</ul></div>
</div>
<div class="sidebar-header-items__end">
<div class="navbar-item">
<script>
document.write(`
<button class="theme-switch-button btn btn-sm btn-outline-primary navbar-btn rounded-circle" title="light/dark" aria-label="light/dark" data-bs-placement="bottom" data-bs-toggle="tooltip">
<span class="theme-switch" data-mode="light"><i class="fa-solid fa-sun"></i></span>
<span class="theme-switch" data-mode="dark"><i class="fa-solid fa-moon"></i></span>
<span class="theme-switch" data-mode="auto"><i class="fa-solid fa-circle-half-stroke"></i></span>
</button>
`);
</script></div>
<div class="navbar-item">
<script>
document.write(`
<div class="version-switcher__container dropdown">
<button type="button" class="version-switcher__button btn btn-sm navbar-btn dropdown-toggle" data-bs-toggle="dropdown">
stable <!-- this text may get changed later by javascript -->
<span class="caret"></span>
</button>
<div class="version-switcher__menu dropdown-menu list-group-flush py-0">
<!-- dropdown will be populated by javascript on page load -->
</div>
</div>
`);
</script></div>
<div class="navbar-item"><ul class="navbar-icon-links navbar-nav"
aria-label="Icon Links">
<li class="nav-item">
<a href="https://gitter.im/matplotlib/matplotlib" title="Gitter" class="nav-link" rel="noopener" target="_blank" data-bs-toggle="tooltip" data-bs-placement="bottom"><span><i class="fa-brands fa-gitter"></i></span>
<label class="sr-only">Gitter</label></a>
</li>
<li class="nav-item">
<a href="https://discourse.matplotlib.org" title="Discourse" class="nav-link" rel="noopener" target="_blank" data-bs-toggle="tooltip" data-bs-placement="bottom"><span><i class="fa-brands fa-discourse"></i></span>
<label class="sr-only">Discourse</label></a>
</li>
<li class="nav-item">
<a href="https://github.com/matplotlib/matplotlib" title="GitHub" class="nav-link" rel="noopener" target="_blank" data-bs-toggle="tooltip" data-bs-placement="bottom"><span><i class="fa-brands fa-github"></i></span>
<label class="sr-only">GitHub</label></a>
</li>
<li class="nav-item">
<a href="https://twitter.com/matplotlib/" title="Twitter" class="nav-link" rel="noopener" target="_blank" data-bs-toggle="tooltip" data-bs-placement="bottom"><span><i class="fa-brands fa-twitter"></i></span>
<label class="sr-only">Twitter</label></a>
</li>
</ul></div>
</div>
</div>
<div class="sidebar-primary-items__start sidebar-primary__section">
<div class="sidebar-primary-item"><nav class="bd-docs-nav bd-links"
aria-label="Section Navigation">
<p class="bd-links__title" role="heading" aria-level="1">Section Navigation</p>
<div class="bd-toc-item navbar-nav"><ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="../development_setup.html">Setting up Matplotlib for development</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
<li class="toctree-l2"><a class="reference internal" href="../../users/installing/dependencies.html">Dependencies</a></li>
</ul>
</li>
</ul>
<ul class="nav bd-sidenav">
<li class="toctree-l1"><a class="reference internal" href="../development_workflow.html">Development workflow</a></li>
</ul>
<ul class="nav bd-sidenav">
<li class="toctree-l1"><a class="reference internal" href="../troubleshooting.html">Troubleshooting</a></li>
</ul>
<ul class="nav bd-sidenav">
<li class="toctree-l1"><a class="reference internal" href="../coding_guide.html">Pull request guidelines</a></li>
<li class="toctree-l1"><a class="reference internal" href="../testing.html">Testing</a></li>
</ul>
<ul class="nav bd-sidenav">
<li class="toctree-l1"><a class="reference internal" href="../document.html">Write documentation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../style_guide.html">Documentation style guide</a></li>
</ul>
<ul class="current nav bd-sidenav">
<li class="toctree-l1"><a class="reference internal" href="../release_guide.html">Release guide</a></li>
<li class="toctree-l1"><a class="reference internal" href="../communication_guide.html">Community management guide</a></li>
<li class="toctree-l1"><a class="reference internal" href="../min_dep_policy.html">Dependency version policy</a></li>
<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">Matplotlib Enhancement Proposals</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="template.html">MEP Template</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP08.html">MEP8: PEP8</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP09.html">MEP9: Global interaction manager</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP10.html">MEP10: Docstring consistency</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP11.html">MEP11: Third-party dependencies</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP12.html">MEP12: Improve Gallery and Examples</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP13.html">MEP13: Use properties for Artists</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP14.html">MEP14: Text handling</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP15.html">MEP15: Fix axis autoscaling when limits are specified for one axis only</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP19.html">MEP19: Continuous Integration</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP21.html">MEP21: color and cm refactor</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP22.html">MEP22: Toolbar rewrite</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP23.html">MEP23: Multiple Figures per GUI window</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP24.html">MEP24: Negative radius in polar plots</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP25.html">MEP25: Serialization</a></li>
<li class="toctree-l2 current active"><a class="current reference internal" href="#">MEP26: Artist styling</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP27.html">MEP27: Decouple pyplot from backends</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP28.html">MEP28: Remove Complexity from Axes.boxplot</a></li>
<li class="toctree-l2"><a class="reference internal" href="MEP29.html">MEP29: Text light markup</a></li>
</ul>
</li>
</ul>
<ul class="nav bd-sidenav">
<li class="toctree-l1"><a class="reference internal" href="../contribute.html">Contribute</a></li>
<li class="toctree-l1"><a class="reference internal" href="../triage.html">Bug triaging and issue curation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../license.html">Licenses</a></li>
<li class="toctree-l1"><a class="reference internal" href="../color_changes.html">Default color changes</a></li>
</ul>
</div>
</nav></div>
</div>
<div class="sidebar-primary-items__end sidebar-primary__section">
</div>
<div id="rtd-footer-container"></div>
</div>
<main id="main-content" class="bd-main">
<div class="bd-content">
<div class="bd-article-container">
<div class="bd-header-article">
<div class="header-article-items header-article__inner">
<div class="header-article-items__start">
<div class="header-article-item">
<nav aria-label="Breadcrumbs">
<ul class="bd-breadcrumbs" role="navigation" aria-label="Breadcrumb">
<li class="breadcrumb-item breadcrumb-home">
<a href="../../index.html" class="nav-link" aria-label="Home">
<i class="fa-solid fa-home"></i>
</a>
</li>
<li class="breadcrumb-item"><a href="../index.html" class="nav-link">Contribute</a></li>
<li class="breadcrumb-item"><a href="index.html" class="nav-link">Matplotlib Enhancement Proposals</a></li>
<li class="breadcrumb-item active" aria-current="page">MEP26: Artist styling</li>
</ul>
</nav>
</div>
</div>
</div>
</div>
<div id="searchbox"></div>
<article class="bd-article" role="main">
<section id="mep26-artist-styling">
<h1>MEP26: Artist styling<a class="headerlink" href="#mep26-artist-styling" title="Link to this heading">#</a></h1>
<nav class="contents local" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#status" id="id1">Status</a></p></li>
<li><p><a class="reference internal" href="#branches-and-pull-requests" id="id2">Branches and Pull requests</a></p></li>
<li><p><a class="reference internal" href="#abstract" id="id3">Abstract</a></p></li>
<li><p><a class="reference internal" href="#detailed-description" id="id4">Detailed description</a></p></li>
<li><p><a class="reference internal" href="#implementation" id="id5">Implementation</a></p>
<ul>
<li><p><a class="reference internal" href="#bnf-grammar" id="id6">BNF Grammar</a></p></li>
<li><p><a class="reference internal" href="#syntax" id="id7">Syntax</a></p>
<ul>
<li><p><a class="reference internal" href="#selectors" id="id8">Selectors</a></p></li>
<li><p><a class="reference internal" href="#gid-selector" id="id9">GID selector</a></p></li>
<li><p><a class="reference internal" href="#attributes-and-values" id="id10">Attributes and values</a></p></li>
</ul>
</li>
<li><p><a class="reference internal" href="#parsing" id="id11">Parsing</a></p></li>
<li><p><a class="reference internal" href="#visitor-pattern-for-matplotlib-figure" id="id12">Visitor pattern for matplotlib figure</a></p></li>
</ul>
</li>
<li><p><a class="reference internal" href="#backward-compatibility" id="id13">Backward compatibility</a></p></li>
<li><p><a class="reference internal" href="#alternatives" id="id14">Alternatives</a></p></li>
<li><p><a class="reference internal" href="#appendix" id="id15">Appendix</a></p>
<ul>
<li><p><a class="reference internal" href="#matplotlib-primitives" id="id16">Matplotlib primitives</a></p></li>
</ul>
</li>
</ul>
</nav>
<section id="status">
<h2><a class="toc-backref" href="#id1" role="doc-backlink">Status</a><a class="headerlink" href="#status" title="Link to this heading">#</a></h2>
<p><strong>Rejected</strong></p>
</section>
<section id="branches-and-pull-requests">
<h2><a class="toc-backref" href="#id2" role="doc-backlink">Branches and Pull requests</a><a class="headerlink" href="#branches-and-pull-requests" title="Link to this heading">#</a></h2>
</section>
<section id="abstract">
<h2><a class="toc-backref" href="#id3" role="doc-backlink">Abstract</a><a class="headerlink" href="#abstract" title="Link to this heading">#</a></h2>
<p>This MEP proposes a new stylesheet implementation to allow more
comprehensive and dynamic styling of artists.</p>
<p>The current version of matplotlib (1.4.0) allows stylesheets based on
the rcParams syntax to be applied before creation of a plot. The
methodology below proposes a new syntax, based on CSS, which would
allow styling of individual artists and properties, which can be
applied dynamically to existing objects.</p>
<p>This is related to (and makes steps toward) the overall goal of moving
to a DOM/tree-like architecture.</p>
</section>
<section id="detailed-description">
<h2><a class="toc-backref" href="#id4" role="doc-backlink">Detailed description</a><a class="headerlink" href="#detailed-description" title="Link to this heading">#</a></h2>
<p>Currently, the look and appearance of existing artist objects (figure,
axes, Line2D, etc.) can only be updated via <code class="docutils literal notranslate"><span class="pre">set_</span></code> and <code class="docutils literal notranslate"><span class="pre">get_</span></code> methods
on the artist object, which is quite laborious, especially if no
reference to the artist(s) has been stored. The new style sheets
introduced in 1.4 allow styling before a plot is created, but do not
offer any means to dynamically update plots or distinguish between
artists of the same type (i.e. to specify the <code class="docutils literal notranslate"><span class="pre">line</span> <span class="pre">color</span></code> and <code class="docutils literal notranslate"><span class="pre">line</span>
<span class="pre">style</span></code> separately for differing <a class="reference internal" href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="matplotlib.lines.Line2D"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Line2D</span></code></a> objects).</p>
<p>The initial development should concentrate on allowing styling of
artist primitives (those <a class="reference internal" href="../../api/artist_api.html#matplotlib.artist.Artist" title="matplotlib.artist.Artist"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Artist</span></code></a>s that do not contain other
<a class="reference internal" href="../../api/artist_api.html#matplotlib.artist.Artist" title="matplotlib.artist.Artist"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Artist</span></code></a>s), and further development could expand the CSS syntax rules
and parser to allow more complex styling. See the appendix for a list
of primitives.</p>
<p>The new methodology would require development of a number of steps:</p>
<ul class="simple">
<li><p>A new stylesheet syntax (likely based on CSS) to allow selection of
artists by type, class, id, etc.</p></li>
<li><p>A mechanism by which to parse a stylesheet into a tree</p></li>
<li><p>A mechanism by which to translate the parse-tree into something
which can be used to update the properties of relevant
artists. Ideally this would implement a method by which to traverse
the artists in a tree-like structure.</p></li>
<li><p>A mechanism by which to generate a stylesheet from existing artist
properties. This would be useful to allow a user to export a
stylesheet from an existing figure (where the appearance may have
been set using the matplotlib API)...</p></li>
</ul>
</section>
<section id="implementation">
<h2><a class="toc-backref" href="#id5" role="doc-backlink">Implementation</a><a class="headerlink" href="#implementation" title="Link to this heading">#</a></h2>
<p>It will be easiest to allow a '3rd party' to modify/set the style of an artist
if the 'style' is created as a separate class and store against the artist as a
property. The <a class="reference internal" href="../../api/backend_bases_api.html#matplotlib.backend_bases.GraphicsContextBase" title="matplotlib.backend_bases.GraphicsContextBase"><code class="xref py py-obj docutils literal notranslate"><span class="pre">GraphicsContextBase</span></code></a> class already provides a the basis of a
<code class="docutils literal notranslate"><span class="pre">Style</span></code> class and an artist's <a class="reference internal" href="../../api/_as_gen/matplotlib.artist.Artist.draw.html#matplotlib.artist.Artist.draw" title="matplotlib.artist.Artist.draw"><code class="xref py py-obj docutils literal notranslate"><span class="pre">draw</span></code></a> method can be refactored to use
the <code class="docutils literal notranslate"><span class="pre">Style</span></code> class rather than setting up its own <a class="reference internal" href="../../api/backend_bases_api.html#matplotlib.backend_bases.GraphicsContextBase" title="matplotlib.backend_bases.GraphicsContextBase"><code class="xref py py-obj docutils literal notranslate"><span class="pre">GraphicsContextBase</span></code></a> and
transferring its style-related properties to it. A minimal example of how this
could be implemented is shown here: <a class="github reference external" href="https://github.com/JamesRamm/mpl_experiment">JamesRamm/mpl_experiment</a></p>
<p>IMO, this will also make the API and code base much neater as
individual get/set methods for artist style properties are now
redundant... Indirectly related would be a general drive to replace
get/set methods with properties. Implementing the style class with
properties would be a big stride toward this...</p>
<p>For initial development, I suggest developing a syntax based on a much
(much much) simplified version of CSS. I am in favour of dubbing this
Artist Style Sheets :+1: :</p>
<section id="bnf-grammar">
<h3><a class="toc-backref" href="#id6" role="doc-backlink">BNF Grammar</a><a class="headerlink" href="#bnf-grammar" title="Link to this heading">#</a></h3>
<p>I propose a very simple syntax to implement initially (like a proof of
concept), which can be expanded upon in the future. The BNF form of
the syntax is given below and then explained</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">RuleSet</span> <span class="p">:</span><span class="o">:=</span> <span class="n">SelectorSequence</span> <span class="s2">"{"</span><span class="n">Declaration</span><span class="s2">"}"</span>
<span class="n">SelectorSequence</span> <span class="p">::</span> <span class="o">=</span> <span class="n">Selector</span> <span class="p">{</span><span class="s2">","</span> <span class="n">Selector</span><span class="p">}</span>
<span class="n">Declaration</span> <span class="p">:</span><span class="o">:=</span> <span class="n">propName</span><span class="s2">":"</span> <span class="n">propValue</span><span class="s2">";"</span>
<span class="n">Selector</span> <span class="p">:</span><span class="o">:=</span> <span class="n">ArtistIdent</span><span class="p">{</span><span class="s2">"#"</span><span class="n">Ident</span><span class="p">}</span>
<span class="n">propName</span> <span class="p">:</span><span class="o">:=</span> <span class="n">Ident</span>
<span class="n">propValue</span> <span class="p">:</span><span class="o">:=</span> <span class="n">Ident</span> <span class="o">|</span> <span class="n">Number</span> <span class="o">|</span> <span class="n">Colour</span> <span class="o">|</span> <span class="s2">"None"</span>
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">ArtistIdent</span></code>, <code class="docutils literal notranslate"><span class="pre">Ident</span></code>, <code class="docutils literal notranslate"><span class="pre">Number</span></code> and <code class="docutils literal notranslate"><span class="pre">Colour</span></code> are tokens (the basic
building blocks of the expression) which are defined by regular
expressions.</p>
</section>
<section id="syntax">
<h3><a class="toc-backref" href="#id7" role="doc-backlink">Syntax</a><a class="headerlink" href="#syntax" title="Link to this heading">#</a></h3>
<p>A CSS stylesheet consists of a series of <strong>rule sets</strong> in hierarchical
order (rules are applied from top to bottom). Each rule follows the
syntax</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">selector</span> <span class="p">{</span><span class="n">attribute</span><span class="p">:</span> <span class="n">value</span><span class="p">;}</span>
</pre></div>
</div>
<p>Each rule can have any number of <code class="docutils literal notranslate"><span class="pre">attribute:</span> <span class="pre">value</span></code> pairs, and a
stylesheet can have any number of rules.</p>
<p>The initial syntax is designed only for <a class="reference internal" href="../../api/artist_api.html#matplotlib.artist.Artist" title="matplotlib.artist.Artist"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Artist</span></code></a> primitives. It does
not address the question of how to set properties on <a class="reference internal" href="../../api/container_api.html#matplotlib.container.Container" title="matplotlib.container.Container"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Container</span></code></a> types
(whose properties may themselves be <a class="reference internal" href="../../api/artist_api.html#matplotlib.artist.Artist" title="matplotlib.artist.Artist"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Artist</span></code></a>s with settable
properties), however, a future solution to this could simply be nested
<code class="docutils literal notranslate"><span class="pre">RuleSet</span></code>s</p>
<section id="selectors">
<h4><a class="toc-backref" href="#id8" role="doc-backlink">Selectors</a><a class="headerlink" href="#selectors" title="Link to this heading">#</a></h4>
<p>Selectors define the object to which the attribute updates should be
applied. As a starting point, I propose just 2 selectors to use in
initial development:</p>
<p>Artist Type Selector</p>
<p>Select an <a class="reference internal" href="../../api/artist_api.html#matplotlib.artist.Artist" title="matplotlib.artist.Artist"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Artist</span></code></a> by it's type. E.g <a class="reference internal" href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="matplotlib.lines.Line2D"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Line2D</span></code></a> or <a class="reference internal" href="../../api/text_api.html#matplotlib.text.Text" title="matplotlib.text.Text"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Text</span></code></a>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Line2D</span> <span class="p">{</span><span class="n">attribute</span><span class="p">:</span> <span class="n">value</span><span class="p">}</span>
</pre></div>
</div>
<p>The regex for matching the artist type selector (<code class="docutils literal notranslate"><span class="pre">ArtistIdent</span></code> in the BNF grammar) would be:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ArtistIdent</span> <span class="o">=</span> <span class="sa">r</span><span class="s1">'(?P<ArtistIdent>\bLine2D\b|\bText\b|\bAxesImage\b|\bFigureImage\b|\bPatch\b)'</span>
</pre></div>
</div>
</section>
<section id="gid-selector">
<h4><a class="toc-backref" href="#id9" role="doc-backlink">GID selector</a><a class="headerlink" href="#gid-selector" title="Link to this heading">#</a></h4>
<p>Select an <a class="reference internal" href="../../api/artist_api.html#matplotlib.artist.Artist" title="matplotlib.artist.Artist"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Artist</span></code></a> by its <code class="docutils literal notranslate"><span class="pre">gid</span></code>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Line2D</span><span class="c1">#myGID {attribute: value}</span>
</pre></div>
</div>
<p>A <code class="docutils literal notranslate"><span class="pre">gid</span></code> can be any string, so the regex could be as follows:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Ident</span> <span class="o">=</span> <span class="sa">r</span><span class="s1">'(?P<Ident>[a-zA-Z_][a-zA-Z_0-9]*)'</span>
</pre></div>
</div>
<p>The above selectors roughly correspond to their CSS counterparts
(<a class="reference external" href="http://www.w3.org/TR/CSS21/selector.html">http://www.w3.org/TR/CSS21/selector.html</a>)</p>
</section>
<section id="attributes-and-values">
<h4><a class="toc-backref" href="#id10" role="doc-backlink">Attributes and values</a><a class="headerlink" href="#attributes-and-values" title="Link to this heading">#</a></h4>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">Attributes</span></code> are any valid (settable) property for the <a class="reference internal" href="../../api/artist_api.html#matplotlib.artist.Artist" title="matplotlib.artist.Artist"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Artist</span></code></a> in question.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">Values</span></code> are any valid value for the property (Usually a string, or number).</p></li>
</ul>
</section>
</section>
<section id="parsing">
<h3><a class="toc-backref" href="#id11" role="doc-backlink">Parsing</a><a class="headerlink" href="#parsing" title="Link to this heading">#</a></h3>
<p>Parsing would consist of breaking the stylesheet into tokens (the
python cookbook gives a nice tokenizing recipe on page 66), applying
the syntax rules and constructing a <code class="docutils literal notranslate"><span class="pre">Tree</span></code>. This requires defining the
grammar of the stylesheet (again, we can borrow from CSS) and writing
a parser. Happily, there is a recipe for this in the python cookbook
as well.</p>
</section>
<section id="visitor-pattern-for-matplotlib-figure">
<h3><a class="toc-backref" href="#id12" role="doc-backlink">Visitor pattern for matplotlib figure</a><a class="headerlink" href="#visitor-pattern-for-matplotlib-figure" title="Link to this heading">#</a></h3>
<p>In order to apply the stylesheet rules to the relevant artists, we
need to 'visit' each artist in a figure and apply the relevant rule.
Here is a visitor class (again, thanks to python cookbook), where each
<code class="docutils literal notranslate"><span class="pre">node</span></code> would be an artist in the figure. A <code class="docutils literal notranslate"><span class="pre">visit_</span></code> method would need
to be implemented for each mpl artist, to handle the different
properties for each</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">Visitor</span><span class="p">:</span>
<span class="k">def</span> <span class="nf">visit</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">node</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="s1">'visit_'</span> <span class="o">+</span> <span class="nb">type</span><span class="p">(</span><span class="n">node</span><span class="p">)</span><span class="o">.</span><span class="vm">__name__</span>
<span class="n">meth</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="n">meth</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">NotImplementedError</span>
<span class="k">return</span> <span class="n">meth</span><span class="p">(</span><span class="n">node</span><span class="p">)</span>
</pre></div>
</div>
<p>An <code class="docutils literal notranslate"><span class="pre">evaluator</span></code> class would then take the stylesheet rules and
implement the visitor on each one of them.</p>
</section>
</section>
<section id="backward-compatibility">
<h2><a class="toc-backref" href="#id13" role="doc-backlink">Backward compatibility</a><a class="headerlink" href="#backward-compatibility" title="Link to this heading">#</a></h2>
<p>Implementing a separate <code class="docutils literal notranslate"><span class="pre">Style</span></code> class would break backward
compatibility as many get/set methods on an artist would become
redundant. While it would be possible to alter these methods to hook
into the <code class="docutils literal notranslate"><span class="pre">Style</span></code> class (stored as a property against the artist), I
would be in favor of simply removing them to both neaten/simplify the
codebase and to provide a simple, uncluttered API...</p>
</section>
<section id="alternatives">
<h2><a class="toc-backref" href="#id14" role="doc-backlink">Alternatives</a><a class="headerlink" href="#alternatives" title="Link to this heading">#</a></h2>
<p>No alternatives, but some of the ground covered here overlaps with
MEP25, which may assist in this development</p>
</section>
<section id="appendix">
<h2><a class="toc-backref" href="#id15" role="doc-backlink">Appendix</a><a class="headerlink" href="#appendix" title="Link to this heading">#</a></h2>
<section id="matplotlib-primitives">
<h3><a class="toc-backref" href="#id16" role="doc-backlink">Matplotlib primitives</a><a class="headerlink" href="#matplotlib-primitives" title="Link to this heading">#</a></h3>
<p>This will form the initial selectors which stylesheets can use.</p>
<ul class="simple">
<li><p>Line2D</p></li>
<li><p>Text</p></li>
<li><p>AxesImage</p></li>
<li><p>FigureImage</p></li>
<li><p>Patch</p></li>
</ul>
</section>
</section>
</section>
</article>
</div>
<div class="bd-sidebar-secondary bd-toc"><div class="sidebar-secondary-items sidebar-secondary__inner">
<div class="sidebar-secondary-item">
<div class="page-toc tocsection onthispage">
<i class="fa-solid fa-list"></i> On this page
</div>
<nav class="bd-toc-nav page-toc">
<ul class="visible nav section-nav flex-column">
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#status">Status</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#branches-and-pull-requests">Branches and Pull requests</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#abstract">Abstract</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#detailed-description">Detailed description</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#implementation">Implementation</a><ul class="nav section-nav flex-column">
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#bnf-grammar">BNF Grammar</a></li>
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#syntax">Syntax</a><ul class="nav section-nav flex-column">
<li class="toc-h4 nav-item toc-entry"><a class="reference internal nav-link" href="#selectors">Selectors</a></li>
<li class="toc-h4 nav-item toc-entry"><a class="reference internal nav-link" href="#gid-selector">GID selector</a></li>
<li class="toc-h4 nav-item toc-entry"><a class="reference internal nav-link" href="#attributes-and-values">Attributes and values</a></li>
</ul>
</li>
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#parsing">Parsing</a></li>
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#visitor-pattern-for-matplotlib-figure">Visitor pattern for matplotlib figure</a></li>
</ul>
</li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#backward-compatibility">Backward compatibility</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#alternatives">Alternatives</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#appendix">Appendix</a><ul class="nav section-nav flex-column">
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#matplotlib-primitives">Matplotlib primitives</a></li>
</ul>
</li>
</ul>
</nav></div>
</div></div>
</div>
<footer class="bd-footer-content">
</footer>
</main>
</div>
</div>
<!-- Scripts loaded after <body> so the DOM is not blocked -->
<script src="../../_static/scripts/bootstrap.js?digest=e353d410970836974a52"></script>
<script src="../../_static/scripts/pydata-sphinx-theme.js?digest=e353d410970836974a52"></script>
<footer class="bd-footer">
<div class="bd-footer__inner bd-page-width">
<div class="footer-items__start">
<div class="footer-item">
<p class="copyright">
© Copyright 2002–2012 John Hunter, Darren Dale, Eric Firing, Michael Droettboom and the Matplotlib development team; 2012–2024 The Matplotlib development team.
<br/>
</p>
</div>
<div class="footer-item">
<p class="sphinx-version">
Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 7.2.6.
<br/>
</p>
</div>
<div class="footer-item">
<p class="sphinx-version">
Built from v3.8.3-2-g6175ebf59d.
<br/>
</p>
</div>
</div>
<div class="footer-items__end">
<div class="footer-item"><p class="theme-version">
Built with the <a href="https://pydata-sphinx-theme.readthedocs.io/en/stable/index.html">PyData Sphinx Theme</a> 0.13.3.
</p></div>
</div>
</div>
</footer>
</body>
</html>