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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
class LayermaskMerger(model_allele.Allele):
"""LayermaskMerger
inv: self.scale_x >= 1.0
inv: self.scale_y >= 1.0
"""
def __init__(self, trunk):
"""Constructor for a simple merger."""
super(LayermaskMerger, self).__init__(trunk)
self.scale_x = 1.0
self.scale_y = 1.0
self.constraint_scale = (1.0, 2.5)
def __eq__(self, other):
"""Equality based on same instance."""
equal = isinstance(other, LayermaskMerger) \
and self.scale_x == other.scale_x \
and self.scale_y == other.scale_y
return equal
def randomize(self):
"""No member variables. Nothing to do."""
self.scale_x = random.uniform(self.constraint_scale[0], self.constraint_scale[1])
self.scale_y = random.uniform(self.constraint_scale[0], self.constraint_scale[1])
def mutate(self):
"""No member variables. Nothing to do."""
if ka_random.is_mutating():
self.scale_x += ka_random.jitter_constrained(self.constraint_scale)
self.scale_x = ka_random.limitate_range(self.scale_x, self.constraint_scale[0], self.constraint_scale[1])
if ka_random.is_mutating():
self.scale_y += ka_random.jitter_constrained(self.constraint_scale)
self.scale_y = ka_random.limitate_range(self.scale_y, self.constraint_scale[0], self.constraint_scale[1])
def shuffle(self):
"""No member variables. Nothing to do."""
pass
def crossingover(self, other):
"""
pre: isinstance(other, LayermaskMerger)
pre: isinstance(self, LayermaskMerger)
# check for distinct references, needs to copy content, not references
post: __return__ is not self
post: __return__ is not other
"""
new_one = LayermaskMerger(self.get_trunk())
cross_sequence = ka_random.crossing_sequence(2)
new_one.scale_x = self.scale_x if cross_sequence[0] else other.scale_x
new_one.scale_y = self.scale_y if cross_sequence[1] else other.scale_y
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 = ctx.get_target().create_similar(cairo.CONTENT_ALPHA,
width, height)
# draw mask.
msk_ctx = cairo.Context(msk_surface)
sx, sy = self.scale_x**2, self.scale_y**2
# sx, sy = 2.5**2, 2.5**2
msk_ctx.scale(sx*width, sy*height)
# msk_ctx.translate(0.5-0.5/sx, 0.5-0.5/sy)
msk_ctx.translate(0.5/sx, 0.5/sy)
# draw mask background
msk_ctx.set_operator(cairo.OPERATOR_SOURCE)
msk_ctx.set_source_rgba(0.0, 0.0, 0.0, 0.5)
msk_ctx.paint()
# draw mask layer
msk_ctx.set_operator(cairo.OPERATOR_SOURCE)
mask_layer.draw(msk_ctx, width, height)
# dummy = ep_layer_referencepattern.ReferencePattern(self.path+'/TODO')
# dummy.operator = cairo.OPERATOR_SOURCE
# dummy.draw(msk_ctx, width, height)
# msk_surface.write_to_png('/dev/shm/TODO.png')
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)
ctx.restore()
single_layer.draw(ctx, width, height)
ctx.restore()
def explain(self):
"""
post len(__return__) == 3
"""
return 'Layermask merger, scale_x**2=' + unicode(self.scale_x**2) \
+ u' scale_y**2=' + unicode(self.scale_y**2), \
None, \
None
def copy(self):
"""A copy constructor.
post: isinstance(__return__, LayermaskMerger)
# check for distinct references, needs to copy content, not references
post: __return__ is not self
"""
new_one = LayermaskMerger(self.get_trunk())
new_one.scale_x = self.scale_x
new_one.scale_y = self.scale_y
return new_one
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