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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 ka_random
import model_locus
class CenteredPositionConstraint(model_locus.Locus):
"""CenteredPositionConstraint
"""
def __init__(self, trunk):
"""Position constraint constructor
"""
super(CenteredPositionConstraint, self).__init__(trunk)
def filter(self, x_pos, y_pos):
"""Set constraint x- and y-position.
post: len(__return__) == 2
"""
xp = (x_pos + 0.5) / 2.0
yp = (y_pos + 0.5) / 2.0
return xp, yp
def randomize(self):
"""Set x- and y-position to random values.
post: len(__return__) == 2
"""
return random.gauss(0.5, 0.1), random.gauss(0.5, 0.1)
def mutate(self, x_pos, y_pos):
"""Make small random changes in x- and y-position.
post: len(__return__) == 2
"""
xp = x_pos + ka_random.jitter(0.2)
xp = (2.0*xp + random.gauss(0.5, 0.1)) / 3.0
yp = y_pos + ka_random.jitter(0.2)
yp = (2.0*yp + random.gauss(0.5, 0.1)) / 3.0
return xp, yp
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