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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 math
import cairo
import ka_extensionpoint
import ka_random
import model_constraintpool
import model_allele
EPSILON = 0.00001
DIRECTION_CONSTRAINT = 'directionconstraint'
class Direction(model_allele.Allele):
"""Direction
"""
cdef = [{'bind' : DIRECTION_CONSTRAINT,
'name' : 'Direction constraint',
'domain': model_constraintpool.STRING_1_OF_N,
'enum' : ka_extensionpoint.list_extensions(DIRECTION_CONSTRAINT)
},
]
def __init__(self, trunk, radian, offset):
"""Direction constructor
"""
super(Direction, self).__init__(trunk)
cpool = model_constraintpool.ConstraintPool.get_pool()
constraint_name = cpool.get(self, DIRECTION_CONSTRAINT)[0]
self.constraint = ka_extensionpoint.create(constraint_name, self.path)
self.radian, self.offset = self.constraint.filter(radian, offset)
def __eq__(self, other):
"""Equality based on radian and offset."""
return isinstance(other, Direction) \
and abs(self.radian - other.radian) < EPSILON \
and abs(self.offset - other.offset) < EPSILON
# def __ne__(self, other):
# return not self.__eq__(other)
#
# def __hash__(self):
# raise TypeError("Genome objects are unhashable")
def randomize(self):
"""Set radian and offset to random values."""
cpool = model_constraintpool.ConstraintPool.get_pool()
constraints = cpool.get(self, DIRECTION_CONSTRAINT)
self.constraint = ka_extensionpoint.create(random.choice(constraints), self.path)
self.radian, self.offset = self.constraint.randomize()
def mutate(self):
"""Make small random changes in radian and offset."""
if ka_random.is_mutating():
if ka_random.is_mutating():
cpool = model_constraintpool.ConstraintPool.get_pool()
constraints = cpool.get(self, DIRECTION_CONSTRAINT)
self.constraint = ka_extensionpoint.create(random.choice(constraints), self.path)
self.radian, self.offset = self.constraint.mutate(self.radian, self.offset)
def shuffle(self):
"""Not implemented."""
pass
def crossingover(self, other):
"""Returns either a copy of self or a copy of other.
pre: isinstance(other, Direction)
# check for distinct references, needs to copy content, not references
post: __return__ is not self
post: __return__ is not other
"""
randseq = ka_random.crossing_sequence(1)
return self.copy() if randseq[0] else other.copy()
def copy(self):
"""A direction copy constructor
post: isinstance(__return__, Direction)
# check for distinct references, needs to copy content, not references
post: __return__ is not self
"""
new_one = Direction(self.get_trunk(), 0.0, 0.0)
new_one.radian, new_one.offset = self.radian, self.offset
new_one.constraint = self.constraint
return new_one
def explain(self):
return u'%4.3f, %4.3f' % (self.radian, self.offset)
@staticmethod
def make_icon(direction_list, width, height):
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
ctx = cairo.Context(surface)
ctx.scale(width, height)
# paint background
ctx.set_operator(cairo.OPERATOR_OVER)
ctx.set_source_rgb(1.0, 1.0, 1.0)
ctx.paint()
ctx.set_line_width(0.02)
for direction in direction_list:
# paint a arrow for each direction
dx = direction.offset * math.cos(direction.radian)
dy = direction.offset * math.sin(direction.radian)
ctx.set_source_rgb(0.0, 0.0, 0.0)
ctx.move_to(0.5, 0.5)
ctx.line_to(0.5+dx, 0.5+dy)
ctx.stroke()
return surface
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