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# coding: UTF8
# Copyright 2009 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_locus
EPSILON = 0.00001
class BwColorConstraint(model_locus.Locus):
"""BwColorConstraint
"""
def __init__(self, trunk):
"""Color constraint constructor
"""
super(BwColorConstraint, self).__init__(trunk)
def filter(self, rgba):
"""Set constraint to red, green, blue and alpha values.
post: len(__return__) == 4
"""
gray = round((rgba[0] + rgba[1] + rgba[2]) / 3.0)
alpha = round(rgba[3])
return (gray, gray, gray, alpha)
def randomize(self):
"""Set black or white and alpha to random values.
post: len(__return__) == 4
post: __return__[0] == 0 or __return__[0] == 1
post: __return__[3] == 0 or __return__[3] == 1
"""
gray = 1.0*random.randint(0, 1)
alpha = 1.0*random.randint(0, 1)
return (gray, gray, gray, alpha)
def mutate(self, rgba):
"""Make random switch between black and white.
post: len(__return__) == 4
"""
return self.randomize()
def explain(self, rgba, alfa=True):
"""
pre: len(rgba) == 4
"""
part1 = 'black' if abs(rgba[0]) < EPSILON else 'white'
part2 = ', %d%% opaque' % (100*rgba[3]) if alfa else ''
return part1 + part2
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