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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
import exon_color
from gettext import gettext as _
class TriadicColorGamut(model_locus.Locus):
"""Manages a series of monochromatic colors."""
def __init__(self, trunk):
"""Color gamut constructor."""
super(TriadicColorGamut, self).__init__(trunk)
self.hue = 0.0
def __eq__(self, other):
"""Equality based on the gamuts components."""
equal = isinstance(other, TriadicColorGamut) \
and self.hue == other.hue
return equal
def randomize(self):
"""Set hue.
"""
self.hue = random.random()
def get_randomized_color(self, path):
"""Set red, green, blue and alpha to random values.
"""
hue_dircetion = random.choice([-1, 0, 1])
hue = self._get_hue(hue_dircetion)
lightness = random.random()
saturation = random.random()
alpha = random.random()
rgb = colorsys.hls_to_rgb(hue, lightness, saturation)
color = exon_color.Color(path, rgb[0], rgb[1], rgb[2], alpha)
color.set_base_color(hue_dircetion, 0, 0)
return color
def mutate(self):
"""Make small random changes in hue.
"""
self.hue = model_random.cyclic_limit(self.hue + model_random.jitter(0.1))
def adjust_color(self, color):
"""Adjust rgba value to mutated hue.
pre: len(color.rgba) == 4
"""
rgba = color.rgba
dummy, lightness, saturation = colorsys.rgb_to_hls( \
rgba[0], rgba[1], rgba[2])
hue = self._get_hue(color.base_diff_hue)
rgb = colorsys.hls_to_rgb(hue, lightness, saturation)
color.rgba = (rgb[0], rgb[1], rgb[2], rgba[3])
def explain(self, formater):
formater.text_item(_('Triadic color scheme'))
def copy(self):
"""The TriadicColorGamut copy constructor
# check for distinct references, needs to copy content, not references
post: __return__ is not self
"""
new_one = TriadicColorGamut(self.get_trunk())
new_one.hue = self.hue
return new_one
def _get_hue(self, hue_dircetion):
if hue_dircetion < 0:
hue = model_random.cyclic_limit(self.hue - (120.0 / 360.0))
elif hue_dircetion > 0:
hue = model_random.cyclic_limit(self.hue + (120.0 / 360.0))
else:
hue = self.hue
return hue
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