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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
import random
import model_random
import model_locus
from gettext import gettext as _
class GrayColorConstraint(model_locus.Locus):
"""GrayColorConstraint
"""
def __init__(self, trunk):
"""Color constraint constructor
"""
super(GrayColorConstraint, self).__init__(trunk)
def filter(self, rgba):
"""Set constraint to red, green, blue and alpha values.
post: len(__return__) == 4
"""
gray = (rgba[0] + rgba[1] + rgba[2]) / 3.0
alpha = rgba[3]
return (gray, gray, gray, alpha)
def randomize(self):
"""Set lightness and alpha to random values.
post: len(__return__) == 4
"""
gray = random.random()
return (gray, gray, gray, random.random())
def mutate(self, rgba):
"""Make small random changes in hue, lightness, saturation.
post: len(__return__) == 4
"""
gray = (rgba[0] + rgba[1] + rgba[2]) / 3.0
gray = model_random.limit(gray + 0.1 * (random.random() - 0.5))
alpha = model_random.limit(rgba[3] + 0.1 * (random.random() - 0.5))
return (gray, gray, gray, alpha)
def explain(self, rgba, alpha=True):
"""
pre: len(rgba) == 4
"""
if alpha:
return _('%(gray)d%% gray, %(opaque)d%% opaque') % {'gray': 100*rgba[0], 'opaque': 100*rgba[3]}
else:
return _('Color is reduced to shades of gray, %d%% gray') % (100*rgba[0])
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