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# Copyright 2015-2017 ARM Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""Defines a generic indexable ColorMap Class"""
import matplotlib.colors as clrs
import matplotlib.cm as cmx
from matplotlib.colors import ListedColormap, Normalize
def to_dygraph_colors(color_map):
"""Convert a color_map specified as a list of rgb tuples to the
syntax that dygraphs expect: ["rgb(1, 2, 3)", "rgb(4, 5, 6)",...]
:param color_map: a list of rgb tuples
:type color_map: list of tuples
"""
rgb_list = ["rgb(" + ", ".join(str(i) for i in e) + ")" for e in color_map]
return '["' + '", "'.join(rgb_list) + '"]'
class ColorMap(object):
"""The Color Map Class to return a gradient method
:param num_colors: Number or colors for which a gradient
is needed
:type num_colors: int
"""
def __init__(self, num_colors, cmap='hsv'):
self.color_norm = clrs.Normalize(vmin=0, vmax=num_colors)
self.scalar_map = cmx.ScalarMappable(norm=self.color_norm, cmap=cmap)
self.num_colors = num_colors
def cmap(self, index):
"""
:param index: Index for the gradient array
:type index: int
:return: The color at specified index
"""
return self.scalar_map.to_rgba(index)
def cmap_inv(self, index):
"""
:param index: Index for the gradient array
:type index: int
:return: The color at :math:`N_{colors} - i`
"""
return self.cmap(self.num_colors - index)
@classmethod
def rgb_cmap(cls, rgb_list):
"""Constructor for a ColorMap from an rgb_list
:param rgb_list: A list of rgb tuples for red, green and blue.
The rgb values should be in the range 0-255.
:type rgb_list: list of tuples
"""
rgb_list = [[x / 255.0 for x in rgb[:3]] for rgb in rgb_list]
rgb_map = ListedColormap(rgb_list, name='default_color_map', N=None)
num_colors = len(rgb_list)
return cls(num_colors, cmap=rgb_map)
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