Coverage for src/colorspace/swatchplot.py: 94%
180 statements
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3def swatchplot(pals, show_names = True, nrow = 20, n = 5, cvd = None, **kwargs):
4 """Palette Swatch Plot
6 Visualization of color palettes in columns of color swatches.
7 The first argument `pals` is very flexible and can be:
9 * List of hex colors,
10 * a single object which inherits from `colorspace.palettes.palette`,
11 `colorspace.palettes.hclpalette`,
12 `colorspace.colorlib.colorobject`,
13 * a list of objects listed above (all of the same type or mixed),
14 * a dictionary with lists of objects as above. If a dictionary is used
15 the keys of the dictionary are used as 'subtitles' to group sets
16 of palettes,
17 * an object of class `colorspace.palettes.hclpalettes`,
18 * or an object of class `matplotlib.colors.LinearSegmentedColormap` or
19 `matplotlib.colors.ListedColormap`.
21 Requires the `matplotlib` to be installed.
23 Args:
24 pals: The color palettes or color objects to be visualized.
25 See description for details and examples to demonstrate different
26 usages.
27 show_names (bool): Should palette names be shown (if available), defaults to True.
28 nrow (int): Maximum number of rows of swatches, defaults to `20`.
29 n (int): Number of colors to be drawn from palette objects, defaults to `5`.
30 cvd (None or list): Allows to display one or multiple palettes and how they look
31 with emulated color vision deficiencies. If `None`, this is not applied.
32 Can be set to a list of characters. Allowed:
33 `"protan"`, `"tritan"`, `"deutan"`, `"desaturate"` corresponding to the functions
34 :py:func:`protan <colorspace.CVD.protan>`,
35 :py:func:`tritan <colorspace.CVD.tritan>`,
36 :py:func:`deutan <colorspace.CVD.deutan>`,
37 :py:func:`desaturate <colorspace.CVD.desaturate>`.
38 **kwargs: forwarded to `matplotlib.pyplot.subplot`, can be used to control e.g.,
39 `figsize`.
41 Example:
43 >>> from colorspace import swatchplot, palette
44 >>> from colorspace import sequential_hcl, diverging_hcl, heat_hcl
45 >>>
46 >>> # List of hex colors
47 >>> swatchplot(['#7FBFF5', '#2A4962', '#111111', '#633C39', '#F8A29E'],
48 >>> figsize = (7, 0.5));
49 >>>
50 >>> #: Create a custom 'palette' (named):
51 >>> pal = palette(['#7FBFF5', '#2A4962', '#111111', '#633C39', '#F8A29E'],
52 >>> "Custom Named Palette")
53 >>> swatchplot(pal, figsize = (7, 0.5));
54 >>>
55 >>> #: A HCL palette. 'n' defines the number of colors.
56 >>> swatchplot(sequential_hcl("PuBu"), n = 10,
57 >>> figsize = (7, 0.5));
58 >>>
59 >>> #: Combine all three
60 >>> swatchplot([['#7FBFF5', '#2A4962', '#111111', '#633C39', '#F8A29E'],
61 >>> pal, sequential_hcl("PuBu")], n = 7,
62 >>> figsize = (7, 1.5));
63 >>>
64 >>> #: A color object (e.g., RGB, HCL, CIELUV, ...)
65 >>> from colorspace.colorlib import hexcols
66 >>> cobject = hexcols(heat_hcl()(5))
67 >>> cobject.to("HCL")
68 >>> print(cobject)
69 >>> #:
70 >>> swatchplot(cobject, figsize = (7, 0.5));
71 >>>
72 >>> #: Using dictionaries to add subtitles
73 >>> # to 'group' different palettes.
74 >>> swatchplot({"Diverging": [diverging_hcl(), diverging_hcl("Red-Green")],
75 >>> "Sequential": [sequential_hcl("ag_Sunset"), sequential_hcl("OrRd")],
76 >>> "Others": [['#7FBFF5', '#2A4962', '#111111', '#633C39', '#F8A29E'],
77 >>> pal, sequential_hcl("PuBu")]}, n = 15);
79 Raises:
80 ImportError: If `matplotlib` is not installed.
81 TypeError: If `nrow` or `n` no int.
82 TypeError: If `show_names` not bool.
83 ValueError: If `nrow` or `n` are not positive.
84 ImportError: If `matplotlib.pyplot` cannot be imported, maybe `matplotlib` not installed?
85 """
87 # Requires matplotlib. If not available, throw ImportError
88 try:
89 import matplotlib.pyplot as plt
90 except ImportError as e:
91 raise ImportError("problems importing matplotlib.pyplt (not installed?)")
93 from numpy import all
95 # Sanity checks: nrow and n only
96 if not isinstance(nrow, int): raise TypeError("argument `nrow` must be int")
97 if not isinstance(n, int): raise TypeError("argument `n` must be int")
98 if not isinstance(show_names, bool): raise TypeError("argument `show_names` must be bool")
99 if not nrow > 0: raise ValueError("argument `nrow` must be positive")
100 if not n > 0: raise ValueError("argument `n` must be positive")
102 # Checking optional cvd argument
103 if not isinstance(cvd, (str, list, type(None))):
104 raise TypeError("unexpected input on argument `cvd`")
105 if isinstance(cvd, list):
106 if not all([isinstance(x, str) for x in cvd]):
107 raise ValueError("unexpected input on argument for `cvd`")
108 elif isinstance(cvd, str):
109 cvd = [cvd]
111 # Checking values
112 if isinstance(cvd, list):
113 valid_cvd_types = ["protan", "tritan", "deutan", "desaturate"]
114 if not all([x in valid_cvd_types for x in cvd]):
115 raise ValueError(f"allowed values for argument `cvd` are: {', '.join(valid_cvd_types)}")
118 # ---------------------------------------------------------------
119 # Setting up matplotlib for plotting
120 # ---------------------------------------------------------------
122 # Allow the user to specify figure size if needed
123 if "figsize" in kwargs:
124 figsize = kwargs["figsize"]
125 if not isinstance(figsize, tuple) or not len(figsize) == 2:
126 raise ValueError("argument `figsize` must be a tuple of length 2")
127 for i in range(2):
128 if not isinstance(figsize[i], int) and not isinstance(figsize[i], float):
129 raise ValueError(f"element [{i}] in `figsize` not int or float.")
130 else:
131 figsize = (5, 4) # default figure size
134 # ---------------------------------------------------------------
135 # Prepare the palettes for plotting the swatches.
136 # The function allows for various types as iput which will
137 # be converted to a list of dicts, or a dict of list of dicts.
138 #
139 # Note that <name> can also be empty if the palette is unnamed.
140 #
141 # One single palette results in:
142 # [{"name": <name>, "colors": <list of hex colors>}]
143 # Multiple palettes result in:
144 # [{"name": <name palette 1>, "colors": <list of hex colors palette 1>},
145 # {"name": <name palette 2>, "colors": <list of hex colors palette 2>},
146 # ...]
147 # Dict of palette collections:
148 # {"First Collection": [{"name": <name palette 1>, "colors": <list of hex colors palette 1>},
149 # {"name": <name palette 2>, "colors": <list of hex colors palette 2>},
150 # ...],
151 # "Second Collection": [{"name": <name palette 1>, "colors": <list of hex colors palette 1>},
152 # {"name": <name palette 2>, "colors": <list of hex colors palette 2>},
153 # ...]}
154 # 'hclpalettes' object will also be converted into
155 # a dictionary as shown above.
156 # ---------------------------------------------------------------
158 from numpy import all, max, sum, where
159 from .palettes import palette, defaultpalette, hclpalette, hclpalettes
160 from .colorlib import colorobject
161 from .utils import check_hex_colors
162 allowed = (palette, defaultpalette, hclpalette)
164 # Helper function; Convert whatever we get (and can) into a simple
165 # dictionary containing "name" (name of palette, defaults to None)
166 # and "colors", a hex-list with colors.
167 def _pal_to_dict(x, n):
168 """Helper function: Converts one palette or color object
170 Converts all possible tpes of color palettes or objects into
171 a dictionary. Used to prepare the inputs to swatchplot for the
172 plot itself.
174 Args:
175 x: Some kind of a color-representing object. See swatchplot
176 description for more details.
177 n (int): Number of colors to be drawn from non-fixed palettes.
179 Return:
180 dict: Returns a single dict with `name` (name of the palette)
181 and `color` (list of hex colors).
183 Raises:
184 Exception: If input `x` is of unknown type/format and cannot be converted.
185 ValueError: If the palette does not provide any color at all.
186 """
189 # In case argument 'pals' is a list we first check if this is
190 # a valid list of hex colors. If so: convert to dictionary.
191 if isinstance(x, list):
192 res = {"name": None, "colors": check_hex_colors(x)}
193 # Single colorobject (e.g., RGB, HCL, CIELUV, ...)
194 elif isinstance(x, colorobject):
195 res = {"name": None, "colors": x.colors(n)}
196 # Single color hclpalette object (e.g., diverging_hcl, sequential_hcl, ...)
197 elif isinstance(x, hclpalette):
198 res = {"name": x.name(), "colors": x.colors(n)}
199 # Single palette object (custom palette)
200 elif isinstance(x, (palette, defaultpalette)):
201 res = {"name": x.name(), "colors": x.colors(n)}
202 else:
203 raise Exception(f"could not convert `pals`, improper input (type {type(x)}).")
205 # Checking length of color list
206 if not len(res["colors"]) > 0:
207 raise ValueError(f"got at least one color object/palette with 0 colors")
208 return res
211 # If 'pals' is:
212 # * a list with proper hex values
213 # * a single colorobject (e.g., RGB, HCL, CIELUV, ...)
214 # * a single hclpalette object (e.g., diverging_hcl, sequential_hcl, ...)
215 # * a single palette object
216 # ... convert and put it into a list of length 1.
217 def _convert_pals_to_list(pals, n):
218 """Helper function: convert list of palettes or color objects.
220 Used as a generic function to convert a series of palettes or color
221 objects given by the user into the format we will need later on for
222 creating ths watchplot.
224 Args:
225 pals: forwarded from main swatchplot call.
226 n (int): number of colors for palette objects, forwarded from main swatchplot call.
228 Returns:
229 list: A dictionary and a list consiting of dictionaries.
230 The first dictionary contains meta information about the number
231 of named palettes (`n_named`), the number of palettes (`n_palettes`),
232 and the highest number of colors among these palettes as it can differ.
233 The second list contains dictionaries where each dictionary contains
234 two elements: `name` (str) defining name of the palette, and
235 `colors` (list) which is a list of hex colors (str), the colors
236 to be displayed.
237 """
239 from matplotlib.colors import LinearSegmentedColormap, ListedColormap
241 # In case we get a list let's check if we have a valid hex list.
242 # Can also be a list of list processed later on.
243 if isinstance(pals, (str, list)):
244 try:
245 pals = [check_hex_colors(pals)]
246 except:
247 pass
249 if isinstance(pals, colorobject) or \
250 isinstance(pals, hclpalette) or isinstance(pals, palette):
251 res = [_pal_to_dict(pals, n)]
252 # What else? If we have a list we now iterate over the different items
253 # and convert each entry into a dict using _pal_to_dict(). Will fail
254 # if we have no rule for this.
255 elif isinstance(pals, list):
256 res = [_pal_to_dict(x, n) for x in pals]
257 # Matplotlib colormap? Convert
258 elif isinstance(pals, (LinearSegmentedColormap, ListedColormap)):
259 from .cmap import cmap_to_sRGB
260 tmp_cols = cmap_to_sRGB(pals, n).colors()
261 res = [_pal_to_dict(palette(tmp_cols, name = pals.name), n)]
262 del tmp_cols
263 # If we got a dictionary we keep the keys as names and extract
264 # the colors from the object(s) itself.
265 elif isinstance(pals, dict):
266 res = []
267 for key,pal in pals.items():
268 tmp = _pal_to_dict(pal, n)
269 res.append({"name": key, "colors": tmp["colors"]})
270 else:
271 raise TypeError(f"cannot deal with object of type \"{type(pals)}\"")
274 # Extract number of palettes, number of named palettes,
275 # and max number of colors.
276 meta = {"n_named": sum([0 if x is None else 1 for x in res]),
277 "n_palettes": len(res),
278 "max_colors": max([len(x["colors"]) for x in res])}
280 # Return meta info and data
281 return meta, res
284 # If input is an object of class hclpalettes we will first
285 # convert it into a dictionary which is then further processed.
286 if isinstance(pals, hclpalettes):
287 tmp = {}
288 for type_ in pals.get_palette_types(): tmp[type_] = pals.get_palettes(type_)
289 # Overwrite input object
290 pals = tmp
293 # If 'pals' is not a dictionary we don't have "groups".
294 # will be converted into one single list (the resulting
295 # object "data").
296 if not isinstance(pals, dict):
297 meta, data = _convert_pals_to_list(pals, n)
299 # Else (dictionary provided by the user) we will
300 # process each item in the dictionary individually.
301 # The result "data" is a dictionary itself (not a list as above).
302 else:
303 meta = None
304 data = {}
305 for key,pal in pals.items():
306 tmp_meta, tmp_data = _convert_pals_to_list(pal, n)
307 data[key] = tmp_data
308 # Store meta information
309 if meta is None:
310 meta = tmp_meta
311 else:
312 meta["n_named"] += tmp_meta["n_named"]
313 meta["n_palettes"] += tmp_meta["n_palettes"]
314 meta["max_colors"] = max([meta["max_colors"], tmp_meta["max_colors"]])
316 # No named palettes? Well, then we can set 'show_names' to FALSE.
317 if meta["n_named"] == 0: show_names = False
320 # ---------------------------------------------------------------
321 # User request for CVD emulated palettes?
322 # ---------------------------------------------------------------
323 if not cvd is None:
324 new_data = dict()
325 counter = 0
327 # Reduce dictionary to list
328 if isinstance(data, dict):
329 from warnings import warn
330 warn("Dictionary inputs to swatchplot in combination with cvd not allowed, " + \
331 "dictionary will be reduced to a list.")
332 tmp_data = []
333 for rec in data.values(): tmp_data += rec
334 data = tmp_data; del tmp_data
336 # Convert list back into a dictionary; each entry is one of the
337 # palettes provided by the user with a series of palettes according
338 # to the types of color vision deficiencies specified
339 if isinstance(data, list):
340 from colorspace import CVD
341 for rec in data:
342 tmp = [{"name": "original", "colors": rec["colors"]}]
343 counter += 1
344 for fn in cvd:
345 tmp.append({"name": fn, "colors": getattr(CVD, fn)(rec["colors"])})
346 counter += 1
347 new_data[rec["name"]] = tmp
349 # Overwrite existing 'data' object and re-specify the
350 # meta information. From here on the plotting is the same
351 # as if the user would have had provided a dictionary with a
352 # series of named palettes in combination with cvd = None.
353 data = new_data
354 meta["n_named"] = counter
355 meta["n_palettes"] = counter
356 del new_data, counter
359 # ---------------------------------------------------------------
360 # Now let's start the fun with plotting!
361 # ---------------------------------------------------------------
362 # Helper function to plot the color palettes
363 # Calls "cmap()" function (see below)
364 def _plot_swatches(data, xpos, ypos, xstep, ystep, show_names, single_palette = False):
365 """Helper function: plotting a swatch.
367 Args:
368 data (list): List of dicts as prepared in the upper part
369 of the swatchplot function.
370 xpos (float): Current X position on the plot.
371 ypos (float): Current Y position on the plot.
372 xstep (float): Step in X-direction for columns.
373 ystep (float): Step in Y-direction for rows.
374 single_palette (bool): Set to true if we have one single palette;
375 changes the x-offset to make use of the full canvas.
377 Raises:
378 TypeError: Wrong unexpected type of input argument (xpos, ypos, xstep, ystep,
379 single_palette, and show_names).
380 ValueError: Arguments out of valid bounds (xpos, ypos, xstep, ystep).
381 """
383 if not isinstance(xpos, float) or not isinstance(ypos, float) or \
384 not isinstance(xstep, float) or not isinstance(ystep, float) or \
385 not isinstance(show_names, bool) or not isinstance(single_palette, bool):
386 raise TypeError("non-suitable input argument (wrong type)")
387 if not xpos >= 0. or not xpos <= 1. or not ypos >= 0. or not ypos <= 1. or \
388 not xstep >= 0. or not xstep <= 1. or not ystep >= 0. or not ystep <= 1:
389 raise ValueError("at least one of xpos/ypos/xstep/ystep out of valid bounds")
392 # Plotting one swatch after another.
393 # Calculates new x/y position which will be returned
394 # and re-used for the next set of palettes (if there are any).
395 for pal in data:
397 # Adding text (only if not single_palette)
398 if show_names and not single_palette:
399 ax.text(xpos + xstep * 0.02, ypos, pal["name"], name_args)
401 # Getting colors, plotting color bar
402 xoff = 0.35 if show_names and not single_palette else 0.
403 _swatch(ax, pal["colors"], len(pal["colors"]), ypos - 0.8 * ystep / 2.,
404 ypos + 0.8 * ystep / 2., xpos + xoff * xstep, xpos + 0.99 * xstep)
406 ypos -= ystep
407 # Start new column
408 if ypos < 0:
409 ypos = 1. - ystep / 2.; xpos = xpos + xstep
411 return xpos, ypos
414 # Helper function, draw the colormap
415 def _swatch(ax, cols, ncols, ylo, yhi, xmin, xmax, boxedupto = 6, frameupto = 9):
417 from numpy import linspace
418 from matplotlib.patches import Rectangle
419 framecol = "#cecece"
421 if ncols == 1:
422 space = 0.
423 step = xmax - xmin
424 xlo = [xmin]
425 edgecolor = framecol
427 elif ncols <= boxedupto:
428 # -----------------------------------------
429 # For n = 2
430 # |<------------ deltax ------------>|
431 # xmin xmax
432 # | -------------------------------- |
433 # |#####COL1####### ######COL2######
434 # | >|-|< space |
435 # |<--- step ------->| |
436 # |xlo[0] |xlo[1] |
437 # | |xhi[0] |xhi[1]
438 #
439 deltax = float(xmax - xmin)
440 space = deltax * 0.05 / (ncols - 1)
441 step = (deltax - float(ncols - 1.) * space) / float(ncols)
442 xlo = linspace(xmin, xmax - step + space, ncols)
443 edgecolor = framecol
445 # Else it is a bit simpler
446 else:
447 space = 0.
448 step = float(xmax - xmin) / float(ncols)
449 xlo = linspace(xmin, xmax - float(xmax - xmin) / (ncols), ncols)
450 edgecolor = framecol if ncols <= frameupto else None
452 # Plotting the rectangles
453 for i in range(0, len(cols)):
454 rect = Rectangle((xlo[i], ylo), (step - space), yhi - ylo,
455 facecolor = "#FFFFFF" if cols[i] is None else cols[i],
456 edgecolor = edgecolor)
457 ax.add_patch(rect)
459 # Outer frame
460 if ncols > frameupto:
461 rect = Rectangle((xmin, ylo), step * len(cols), yhi - ylo,
462 facecolor = "none", edgecolor = framecol)
463 ax.add_patch(rect)
466 # ---------------------------------------------------------------
467 # Plot
468 # ---------------------------------------------------------------
469 # Initialize new figure
470 #fig, ax = plt.subplots(figsize = figsize)
471 if "files_regex" in kwargs.keys(): del kwargs["files_regex"]
472 fig, ax = plt.subplots(**kwargs)
474 # Compute number of columns needed. Thus, we first of all have to check
475 # if 'data' is a list (no group-titles) or a dictionary (each block/group
476 # of palettes gets a title -> more space needed).
477 if isinstance(data, dict):
478 nblocks = meta["n_palettes"] + len(data)
479 else:
480 nblocks = meta["n_palettes"]
481 if nblocks <= nrow:
482 ncol = 1
483 nrow = nblocks
484 else:
485 from numpy import ceil
486 ncol = ceil(float(nblocks) / float(nrow))
488 # Plotting the different color maps
489 ystep = 1. / float(nrow)
490 ypos = 1. - ystep / 2
492 # Starting top left
493 xstep = 1. / float(ncol)
494 xpos = 0.
496 # Adjusting outer margins
497 fig.subplots_adjust(left = 0., bottom = 0., right = 1.,
498 top = 1., wspace = 0., hspace = 0.)
499 ax.axis("off")
500 # Small white margin around the plot
501 ax.set_xlim(-0.01, 1.01); ax.set_ylim(-0.01, 1.01)
503 # Styling of the texts
504 type_args = {"weight": "bold", "va": "center", "ha": "left"}
505 type_args["size"] = "large" if meta["n_palettes"] > 20 else "xx-large"
506 name_args = {"va": "center", "ha": "left"}
508 # One or multiple palettes but no titles/grouping
509 if isinstance(data, list):
510 xpos, ypos = _plot_swatches(data, xpos, ypos, xstep, ystep, show_names)
511 # Else dictionary: adding additional titles for grouping
512 else:
513 for key,pal in data.items():
514 ax.text(xpos + xstep * 0.02, ypos, key, type_args)
515 ypos -= ystep
516 # Start new column
517 if ypos < 0:
518 ypos = 1. - ystep / 2.; xpos = xpos + xstep
519 xpos, ypos = _plot_swatches(pal, xpos, ypos, xstep, ystep, show_names)
521 # Show figure
522 plt.show()
524 return fig