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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 cairo
import model_allele
import ka_random
import ka_importer
class AlphaImageMerger(model_allele.Allele):
"""AlphaImageMerger
"""
constraint_wieght = (0.0, 0.5)
def __init__(self, trunk):
"""Constructor for a simple merger."""
super(AlphaImageMerger, self).__init__(trunk)
self.selected_image = ''
def __eq__(self, other):
"""Equality based on same instance."""
equal = isinstance(other, AlphaImageMerger) \
and self.selected_image == other.selected_image
return equal
def randomize(self):
"""No member variables. Nothing to do."""
image_list = ka_importer.get_alpha_image_list()
self.selected_image = image_list[random.randint(0, len(image_list)-1)]
def mutate(self):
"""No member variables. Nothing to do."""
if ka_random.is_mutating():
image_list = ka_importer.get_alpha_image_list()
self.selected_image = image_list[random.randint(0, len(image_list)-1)]
def shuffle(self):
"""No member variables. Nothing to do."""
pass
def crossingover(self, other):
"""
pre: isinstance(other, AlphaImageMerger)
pre: isinstance(self, AlphaImageMerger)
# check for distinct references, needs to copy content, not references
post: __return__ is not self
post: __return__ is not other
"""
new_one = AlphaImageMerger(self.get_trunk())
cross_sequence = ka_random.crossing_sequence(1)
new_one.selected_image = self.selected_image if cross_sequence[0] \
else other.selected_image
return new_one
def draw_single_layer(self, single_layer, mask_layer, ctx, width, height):
"""
pre: single_layer is not None
pre: ctx is not None
pre: width > 0
pre: height > 0
pre: width == height
"""
# paint one layer
ctx.save()
msk_surface = cairo.ImageSurface.create_from_png(self.selected_image)
ctx.save()
ctx.translate(-0.5, -0.5)
ctx.scale(1.0/msk_surface.get_width(), 1.0/msk_surface.get_height())
ctx.mask_surface(msk_surface, 0.0, 0.0)
ctx.restore()
single_layer.draw(ctx, width, height)
ctx.restore()
def explain(self):
"""
post len(__return__) == 3
"""
png_surface = cairo.ImageSurface.create_from_png(self.selected_image)
width = height = 48
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
ctx = cairo.Context(surface)
ctx.scale(width, height)
ctx.scale(1.0/png_surface.get_width(), 1.0/png_surface.get_height())
ctx.set_source_surface(png_surface)
ctx.paint()
return u'Transparent image merger, image ' \
+ unicode(self.selected_image), \
surface, \
self.selected_image
def copy(self):
"""A copy constructor.
post: isinstance(__return__, AlphaImageMerger)
# check for distinct references, needs to copy content, not references
post: __return__ is not self
"""
new_one = AlphaImageMerger(self.get_trunk())
new_one.selected_image = self.selected_image
return new_one
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