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# coding: UTF-8
# Copyright 2009, 2010 Thomas Jourdan
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""Extension point for color constraints.
This module handles a continuous red, green, blue and alpha color space."""
import random
import colorsys
import model_random
import model_locus
from gettext import gettext as _
class NoneColorConstraint(model_locus.Locus):
"""No color constraint."""
def __init__(self, trunk):
"""Color constraint constructor."""
super(NoneColorConstraint, self).__init__(trunk)
def filter(self, rgba):
"""Use unfiltered red, green, blue and alpha values.
pre: len(rgba) == 4
post: len(__return__) == 4
"""
return (rgba[0], rgba[1], rgba[2], rgba[3])
def randomize(self):
"""Set red, green, blue and alpha to random values.
post: len(__return__) == 4
"""
return (random.random(), random.random(), random.random(), \
random.random())
def mutate(self, rgba):
"""Make small random changes in hue, lightness, saturation.
pre: len(rgba) == 4
post: len(__return__) == 4
"""
hue, lightness, saturation = colorsys.rgb_to_hls( \
rgba[0], rgba[1], rgba[2])
hue = model_random.cyclic_limit(hue + 0.1 * (random.random() - 0.5))
lightness = model_random.limit(lightness + 0.1 * (random.random() - 0.5))
saturation = model_random.limit(saturation + 0.1 * (random.random() - 0.5))
alpha = model_random.limit(rgba[3] + 0.1 * (random.random() - 0.5))
rgb = colorsys.hls_to_rgb(hue, lightness, saturation)
return (rgb[0], rgb[1], rgb[2], alpha)
def explain(self, rgba, alpha=True):
"""Explain current values.
pre: len(rgba) == 4
"""
if alpha:
return _('%d%% red, %d%% green, %d%% blue, %d%% opaque') \
% (100*rgba[0], 100*rgba[1], 100*rgba[2], 100*rgba[3])
else:
return _('%d%% red, %d%% green, %d%% blue') \
% (100*rgba[0], 100*rgba[1], 100*rgba[2])
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