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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 the black and white schema."""
import random
import model_locus
from gettext import gettext as _
EPSILON = 0.00001
class BwColorConstraint(model_locus.Locus):
"""black and white color constraint."""
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.
pre: len(rgba) == 4
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):
"""Make a random choice between black or white.
And make a random choice between opaque or transparent.
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, dummy):
"""see: randomize()
post: len(__return__) == 4
"""
return self.randomize()
def explain(self, rgba, alpha=True):
"""Explain current values.
pre: len(rgba) == 4
"""
part1 = _('black') if abs(rgba[0]) < EPSILON else _('white')
part2 = _(', %d%% opaque') % (100*rgba[3]) if alpha else ''
return _('Color is reduced to black and white, ') + part1 + part2
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