/usr/lib/python2.7/dist-packages/plotly/colors.py is in python-plotly 1.13.0+dfsg-1.
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colors
=====
Functions that manipulate colors and arrays of colors.
There are three basic types of color types: rgb, hex and tuple:
rgb - An rgb color is a string of the form 'rgb(a,b,c)' where a, b and c are
integers between 0 and 255 inclusive.
hex - A hex color is a string of the form '#xxxxxx' where each x is a
character that belongs to the set [0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f]. This is
just the set of characters used in the hexadecimal numeric system.
tuple - A tuple color is a 3-tuple of the form (a,b,c) where a, b and c are
floats between 0 and 1 inclusive.
"""
from __future__ import absolute_import
import decimal
from numbers import Number
from plotly import exceptions
DEFAULT_PLOTLY_COLORS = ['rgb(31, 119, 180)', 'rgb(255, 127, 14)',
'rgb(44, 160, 44)', 'rgb(214, 39, 40)',
'rgb(148, 103, 189)', 'rgb(140, 86, 75)',
'rgb(227, 119, 194)', 'rgb(127, 127, 127)',
'rgb(188, 189, 34)', 'rgb(23, 190, 207)']
PLOTLY_SCALES = {
'Greys': [
[0, 'rgb(0,0,0)'], [1, 'rgb(255,255,255)']
],
'YlGnBu': [
[0, 'rgb(8,29,88)'], [0.125, 'rgb(37,52,148)'],
[0.25, 'rgb(34,94,168)'], [0.375, 'rgb(29,145,192)'],
[0.5, 'rgb(65,182,196)'], [0.625, 'rgb(127,205,187)'],
[0.75, 'rgb(199,233,180)'], [0.875, 'rgb(237,248,217)'],
[1, 'rgb(255,255,217)']
],
'Greens': [
[0, 'rgb(0,68,27)'], [0.125, 'rgb(0,109,44)'],
[0.25, 'rgb(35,139,69)'], [0.375, 'rgb(65,171,93)'],
[0.5, 'rgb(116,196,118)'], [0.625, 'rgb(161,217,155)'],
[0.75, 'rgb(199,233,192)'], [0.875, 'rgb(229,245,224)'],
[1, 'rgb(247,252,245)']
],
'YlOrRd': [
[0, 'rgb(128,0,38)'], [0.125, 'rgb(189,0,38)'],
[0.25, 'rgb(227,26,28)'], [0.375, 'rgb(252,78,42)'],
[0.5, 'rgb(253,141,60)'], [0.625, 'rgb(254,178,76)'],
[0.75, 'rgb(254,217,118)'], [0.875, 'rgb(255,237,160)'],
[1, 'rgb(255,255,204)']
],
'Bluered': [
[0, 'rgb(0,0,255)'], [1, 'rgb(255,0,0)']
],
# modified RdBu based on
# www.sandia.gov/~kmorel/documents/ColorMaps/ColorMapsExpanded.pdf
'RdBu': [
[0, 'rgb(5,10,172)'], [0.35, 'rgb(106,137,247)'],
[0.5, 'rgb(190,190,190)'], [0.6, 'rgb(220,170,132)'],
[0.7, 'rgb(230,145,90)'], [1, 'rgb(178,10,28)']
],
# Scale for non-negative numeric values
'Reds': [
[0, 'rgb(220,220,220)'], [0.2, 'rgb(245,195,157)'],
[0.4, 'rgb(245,160,105)'], [1, 'rgb(178,10,28)']
],
# Scale for non-positive numeric values
'Blues': [
[0, 'rgb(5,10,172)'], [0.35, 'rgb(40,60,190)'],
[0.5, 'rgb(70,100,245)'], [0.6, 'rgb(90,120,245)'],
[0.7, 'rgb(106,137,247)'], [1, 'rgb(220,220,220)']
],
'Picnic': [
[0, 'rgb(0,0,255)'], [0.1, 'rgb(51,153,255)'],
[0.2, 'rgb(102,204,255)'], [0.3, 'rgb(153,204,255)'],
[0.4, 'rgb(204,204,255)'], [0.5, 'rgb(255,255,255)'],
[0.6, 'rgb(255,204,255)'], [0.7, 'rgb(255,153,255)'],
[0.8, 'rgb(255,102,204)'], [0.9, 'rgb(255,102,102)'],
[1, 'rgb(255,0,0)']
],
'Rainbow': [
[0, 'rgb(150,0,90)'], [0.125, 'rgb(0,0,200)'],
[0.25, 'rgb(0,25,255)'], [0.375, 'rgb(0,152,255)'],
[0.5, 'rgb(44,255,150)'], [0.625, 'rgb(151,255,0)'],
[0.75, 'rgb(255,234,0)'], [0.875, 'rgb(255,111,0)'],
[1, 'rgb(255,0,0)']
],
'Portland': [
[0, 'rgb(12,51,131)'], [0.25, 'rgb(10,136,186)'],
[0.5, 'rgb(242,211,56)'], [0.75, 'rgb(242,143,56)'],
[1, 'rgb(217,30,30)']
],
'Jet': [
[0, 'rgb(0,0,131)'], [0.125, 'rgb(0,60,170)'],
[0.375, 'rgb(5,255,255)'], [0.625, 'rgb(255,255,0)'],
[0.875, 'rgb(250,0,0)'], [1, 'rgb(128,0,0)']
],
'Hot': [
[0, 'rgb(0,0,0)'], [0.3, 'rgb(230,0,0)'],
[0.6, 'rgb(255,210,0)'], [1, 'rgb(255,255,255)']
],
'Blackbody': [
[0, 'rgb(0,0,0)'], [0.2, 'rgb(230,0,0)'],
[0.4, 'rgb(230,210,0)'], [0.7, 'rgb(255,255,255)'],
[1, 'rgb(160,200,255)']
],
'Earth': [
[0, 'rgb(0,0,130)'], [0.1, 'rgb(0,180,180)'],
[0.2, 'rgb(40,210,40)'], [0.4, 'rgb(230,230,50)'],
[0.6, 'rgb(120,70,20)'], [1, 'rgb(255,255,255)']
],
'Electric': [
[0, 'rgb(0,0,0)'], [0.15, 'rgb(30,0,100)'],
[0.4, 'rgb(120,0,100)'], [0.6, 'rgb(160,90,0)'],
[0.8, 'rgb(230,200,0)'], [1, 'rgb(255,250,220)']
],
'Viridis': [
[0, '#440154'], [0.06274509803921569, '#48186a'],
[0.12549019607843137, '#472d7b'], [0.18823529411764706, '#424086'],
[0.25098039215686274, '#3b528b'], [0.3137254901960784, '#33638d'],
[0.3764705882352941, '#2c728e'], [0.4392156862745098, '#26828e'],
[0.5019607843137255, '#21918c'], [0.5647058823529412, '#1fa088'],
[0.6274509803921569, '#28ae80'], [0.6901960784313725, '#3fbc73'],
[0.7529411764705882, '#5ec962'], [0.8156862745098039, '#84d44b'],
[0.8784313725490196, '#addc30'], [0.9411764705882353, '#d8e219'],
[1, '#fde725']
]
}
def color_parser(colors, function):
"""
Takes color(s) and a function and applies the function on the color(s)
In particular, this function identifies whether the given color object
is an iterable or not and applies the given color-parsing function to
the color or iterable of colors. If given an iterable, it will only be
able to work with it if all items in the iterable are of the same type
- rgb string, hex string or tuple
"""
if isinstance(colors, str):
return function(colors)
if isinstance(colors, tuple) and isinstance(colors[0], Number):
return function(colors)
if hasattr(colors, '__iter__'):
if isinstance(colors, tuple):
new_color_tuple = tuple(function(item) for item in colors)
return new_color_tuple
else:
new_color_list = [function(item) for item in colors]
return new_color_list
def validate_colors(colors):
"""
Validates color(s) and returns an error for invalid color(s)
:param (str|tuple|list) colors: either a plotly scale name, an rgb or hex
color, a color tuple or a list/tuple of colors
"""
colors_list = []
# if colors is a single color, put into colors_list
if isinstance(colors, str):
if colors in PLOTLY_SCALES:
return
elif 'rgb' in colors or '#' in colors:
colors_list.append(colors)
else:
raise exceptions.PlotlyError(
'If your colors variable is a string, it must be a '
'Plotly scale, an rgb color or a hex color.'
)
elif isinstance(colors, tuple):
if isinstance(colors[0], Number):
colors_list = [colors]
else:
colors_list = list(colors)
if isinstance(colors, dict):
colors_list.extend(colors.values())
elif isinstance(colors, list):
colors_list = colors
# Validate colors in colors_list
for j, each_color in enumerate(colors_list):
if 'rgb' in each_color:
each_color = color_parser(
each_color, unlabel_rgb
)
for value in each_color:
if value > 255.0:
raise exceptions.PlotlyError(
'Whoops! The elements in your rgb colors '
'tuples cannot exceed 255.0.'
)
elif '#' in each_color:
each_color = color_parser(
each_color, hex_to_rgb
)
elif isinstance(each_color, tuple):
for value in each_color:
if value > 1.0:
raise exceptions.PlotlyError(
'Whoops! The elements in your colors tuples '
'cannot exceed 1.0.'
)
def convert_colors_to_same_type(colors, colortype='rgb', scale=None,
return_default_colors=False,
num_of_defualt_colors=2):
"""
Converts color(s) to the specified color type
Takes a single color or an iterable of colors, as well as a list of scale
values, and outputs a 2-pair of the list of color(s) converted all to an
rgb or tuple color type, aswell as the scale as the second element. If
colors is a Plotly Scale name, then 'scale' will be forced to the scale
from the respective colorscale and the colors in that colorscale will also
be coverted to the selected colortype. If colors is None, then there is an
option to return portion of the DEFAULT_PLOTLY_COLORS
:param (str|tuple|list) colors: either a plotly scale name, an rgb or hex
color, a color tuple or a list/tuple of colors
:param (list) scale: see docs for validate_scale_values()
:rtype (tuple) (colors_list, scale) if scale is None in the function call,
then scale will remain None in the returned tuple
"""
#if colors_list is None:
colors_list = []
if colors is None and return_default_colors is True:
colors_list = DEFAULT_PLOTLY_COLORS[0:num_of_defualt_colors]
if isinstance(colors, str):
if colors in PLOTLY_SCALES:
colors_list = colorscale_to_colors(PLOTLY_SCALES[colors])
if scale is None:
scale = colorscale_to_scale(PLOTLY_SCALES[colors])
elif 'rgb' in colors or '#' in colors:
colors_list = [colors]
elif isinstance(colors, tuple):
if isinstance(colors[0], Number):
colors_list = [colors]
else:
colors_list = list(colors)
elif isinstance(colors, list):
colors_list = colors
# validate scale
if scale is not None:
validate_scale_values(scale)
if len(colors_list) != len(scale):
raise exceptions.PlotlyError(
'Make sure that the length of your scale matches the length '
'of your list of colors which is {}.'.format(len(colors_list))
)
# convert all colors to rgb
for j, each_color in enumerate(colors_list):
if '#' in each_color:
each_color = color_parser(
each_color, hex_to_rgb
)
each_color = color_parser(
each_color, label_rgb
)
colors_list[j] = each_color
elif isinstance(each_color, tuple):
each_color = color_parser(
each_color, convert_to_RGB_255
)
each_color = color_parser(
each_color, label_rgb
)
colors_list[j] = each_color
if colortype == 'rgb':
return (colors_list, scale)
elif colortype == 'tuple':
for j, each_color in enumerate(colors_list):
each_color = color_parser(
each_color, unlabel_rgb
)
each_color = color_parser(
each_color, unconvert_from_RGB_255
)
colors_list[j] = each_color
return (colors_list, scale)
else:
raise exceptions.PlotlyError('You must select either rgb or tuple '
'for your colortype variable.')
def convert_dict_colors_to_same_type(colors_dict, colortype='rgb'):
"""
Converts a colors in a dictioanry of colors to the specified color type
:param (dict) colors_dict: a dictioanry whose values are single colors
"""
for key in colors_dict:
if '#' in colors_dict[key]:
colors_dict[key] = color_parser(
colors_dict[key], hex_to_rgb
)
colors_dict[key] = color_parser(
colors_dict[key], label_rgb
)
elif isinstance(colors_dict[key], tuple):
colors_dict[key] = color_parser(
colors_dict[key], convert_to_RGB_255
)
colors_dict[key] = color_parser(
colors_dict[key], label_rgb
)
if colortype == 'rgb':
return colors_dict
elif colortype == 'tuple':
for key in colors_dict:
colors_dict[key] = color_parser(
colors_dict[key], unlabel_rgb
)
colors_dict[key] = color_parser(
colors_dict[key], unconvert_from_RGB_255
)
return colors_dict
else:
raise exceptions.PlotlyError('You must select either rgb or tuple '
'for your colortype variable.')
def validate_scale_values(scale):
"""
Validates scale values from a colorscale
:param (list) scale: a strictly increasing list of floats that begins
with 0 and ends with 1. Its usage derives from a colorscale which is
a list of two-lists (a list with two elements) of the form
[value, color] which are used to determine how interpolation weighting
works between the colors in the colorscale. Therefore scale is just
the extraction of these values from the two-lists in order
"""
if len(scale) < 2:
raise exceptions.PlotlyError('You must input a list of scale values '
'that has at least two values.')
if (scale[0] != 0) or (scale[-1] != 1):
raise exceptions.PlotlyError(
'The first and last number in your scale must be 0.0 and 1.0 '
'respectively.'
)
if not all(x < y for x, y in zip(scale, scale[1:])):
raise exceptions.PlotlyError(
"'scale' must be a list that contains a strictly increasing "
"sequence of numbers."
)
def make_colorscale(colors, scale=None):
"""
Makes a colorscale from a list of colors and a scale
Takes a list of colors and scales and constructs a colorscale based
on the colors in sequential order. If 'scale' is left empty, a linear-
interpolated colorscale will be generated. If 'scale' is a specificed
list, it must be the same legnth as colors and must contain all floats
For documentation regarding to the form of the output, see
https://plot.ly/python/reference/#mesh3d-colorscale
:param (list) colors: a list of single colors
"""
colorscale = []
# validate minimum colors length of 2
if len(colors) < 2:
raise exceptions.PlotlyError('You must input a list of colors that '
'has at least two colors.')
if scale is None:
scale_incr = 1./(len(colors) - 1)
return [[i * scale_incr, color] for i, color in enumerate(colors)]
else:
if len(colors) != len(scale):
raise exceptions.PlotlyError('The length of colors and scale '
'must be the same.')
validate_scale_values(scale)
colorscale = [list(tup) for tup in zip(scale, colors)]
return colorscale
def find_intermediate_color(lowcolor, highcolor, intermed):
"""
Returns the color at a given distance between two colors
This function takes two color tuples, where each element is between 0
and 1, along with a value 0 < intermed < 1 and returns a color that is
intermed-percent from lowcolor to highcolor
"""
diff_0 = float(highcolor[0] - lowcolor[0])
diff_1 = float(highcolor[1] - lowcolor[1])
diff_2 = float(highcolor[2] - lowcolor[2])
return (lowcolor[0] + intermed * diff_0,
lowcolor[1] + intermed * diff_1,
lowcolor[2] + intermed * diff_2)
def unconvert_from_RGB_255(colors):
"""
Return a tuple where each element gets divided by 255
Takes a (list of) color tuple(s) where each element is between 0 and
255. Returns the same tuples where each tuple element is normalized to
a value between 0 and 1
"""
return (colors[0]/(255.0),
colors[1]/(255.0),
colors[2]/(255.0))
def convert_to_RGB_255(colors):
"""
Multiplies each element of a triplet by 255
Each coordinate of the color tuple is rounded to the nearest float and
then is turned into an integer. If a number is of the form x.5, then
if x is odd, the number rounds up to (x+1). Otherwise, it rounds down
to just x. This is the way rounding works in Python 3 and in current
statistical analysis to avoid rounding bias
:param (list) rgb_components: grabs the three R, G and B values to be
returned as computed in the function
"""
rgb_components = []
for component in colors:
rounded_num = decimal.Decimal(str(component*255.0)).quantize(
decimal.Decimal('1'), rounding=decimal.ROUND_HALF_EVEN
)
# convert rounded number to an integer from 'Decimal' form
rounded_num = int(rounded_num)
rgb_components.append(rounded_num)
return (rgb_components[0], rgb_components[1], rgb_components[2])
def n_colors(lowcolor, highcolor, n_colors):
"""
Splits a low and high color into a list of n_colors colors in it
Accepts two color tuples and returns a list of n_colors colors
which form the intermediate colors between lowcolor and highcolor
from linearly interpolating through RGB space
"""
diff_0 = float(highcolor[0] - lowcolor[0])
incr_0 = diff_0/(n_colors - 1)
diff_1 = float(highcolor[1] - lowcolor[1])
incr_1 = diff_1/(n_colors - 1)
diff_2 = float(highcolor[2] - lowcolor[2])
incr_2 = diff_2/(n_colors - 1)
color_tuples = []
for index in range(n_colors):
new_tuple = (lowcolor[0] + (index * incr_0),
lowcolor[1] + (index * incr_1),
lowcolor[2] + (index * incr_2))
color_tuples.append(new_tuple)
return color_tuples
def label_rgb(colors):
"""
Takes tuple (a, b, c) and returns an rgb color 'rgb(a, b, c)'
"""
return ('rgb(%s, %s, %s)' % (colors[0], colors[1], colors[2]))
def unlabel_rgb(colors):
"""
Takes rgb color(s) 'rgb(a, b, c)' and returns tuple(s) (a, b, c)
This function takes either an 'rgb(a, b, c)' color or a list of
such colors and returns the color tuples in tuple(s) (a, b, c)
"""
str_vals = ''
for index in range(len(colors)):
try:
float(colors[index])
str_vals = str_vals + colors[index]
except ValueError:
if colors[index] == ',' or colors[index] == '.':
str_vals = str_vals + colors[index]
str_vals = str_vals + ','
numbers = []
str_num = ''
for char in str_vals:
if char != ',':
str_num = str_num + char
else:
numbers.append(float(str_num))
str_num = ''
return (numbers[0], numbers[1], numbers[2])
def hex_to_rgb(value):
"""
Calculates rgb values from a hex color code.
:param (string) value: Hex color string
:rtype (tuple) (r_value, g_value, b_value): tuple of rgb values
"""
value = value.lstrip('#')
hex_total_length = len(value)
rgb_section_length = hex_total_length // 3
return tuple(int(value[i:i + rgb_section_length], 16)
for i in range(0, hex_total_length, rgb_section_length))
def colorscale_to_colors(colorscale):
"""
Extracts the colors from colorscale as a list
"""
color_list = []
for item in colorscale:
color_list.append(item[1])
return color_list
def colorscale_to_scale(colorscale):
"""
Extracts the interpolation scale values from colorscale as a list
"""
scale_list = []
for item in colorscale:
scale_list.append(item[0])
return scale_list
def convert_colorscale_to_rgb(colorscale):
"""
Converts the colors in a colorscale to rgb colors
A colorscale is an array of arrays, each with a numeric value as the
first item and a color as the second. This function specifically is
converting a colorscale with tuple colors (each coordinate between 0
and 1) into a colorscale with the colors transformed into rgb colors
"""
for color in colorscale:
color[1] = convert_to_RGB_255(color[1])
for color in colorscale:
color[1] = label_rgb(color[1])
return colorscale
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