1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
# 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
import ka_utils
import model_random
import model_locus
import model_allele
import model_constraintpool
from gettext import gettext as _
import math
X_CENTER_CONSTRAINT = 'xcenterconstraint'
Y_CENTER_CONSTRAINT = 'ycenterconstraint'
STEPS_CONSTRAINT = 'stepsconstraint'
ANGLE_CONSTRAINT = 'angleconstraint'
C_CONSTRAINT = 'cconstraint'
class FermatSpiralSampler(model_allele.Allele):
"""FermatSpiralSampler: Reverse the layer horizontally or vertically.
"""
cdef = [{'bind' : X_CENTER_CONSTRAINT,
'name' : 'Center point x',
'domain': model_constraintpool.FLOAT_RANGE,
'min' : -1.0, 'max': 2.0},
{'bind' : Y_CENTER_CONSTRAINT,
'name' : 'Center point y',
'domain': model_constraintpool.FLOAT_RANGE,
'min' : -1.0, 'max': 2.0},
{'bind' : STEPS_CONSTRAINT,
'name' : 'Number of samples.',
'domain': model_constraintpool.INT_RANGE,
'min' : -50, 'max': 50},
{'bind' : ANGLE_CONSTRAINT,
'name' : 'Angle per sampling step for Fermat spiral',
'domain': model_constraintpool.FLOAT_RANGE,
'min' : -math.pi, 'max': math.pi},
{'bind' : C_CONSTRAINT,
'name' : 'Scaling constant for Fermat spiral',
'domain': model_constraintpool.FLOAT_RANGE,
'min' : -0.1, 'max': 0.1},
]
def __init__(self, trunk):
"""Constructor for a flip merger."""
super(FermatSpiralSampler, self).__init__(trunk)
self.x_center = 0.5
self.y_center = 0.5
self.start = 1
self.end = 1
self.angle = 0.0
self.c = 0.0
def __eq__(self, other):
"""Equality based on fliping horizontally or vertically."""
equal = isinstance(other, FermatSpiralSampler) \
and self.x_center == other.x_center \
and self.y_center == other.y_center \
and self.start == other.start \
and self.end == other.end \
and self.angle == other.angle \
and self.c == other.c
return equal
def randomize(self):
"""Randomize"""
cpool = model_constraintpool.ConstraintPool.get_pool()
x_center_constraint = cpool.get(self, X_CENTER_CONSTRAINT)
self.x_center = model_random.uniform_constrained(x_center_constraint)
y_center_constraint = cpool.get(self, Y_CENTER_CONSTRAINT)
self.y_center = model_random.uniform_constrained(y_center_constraint)
steps_constraint = cpool.get(self, STEPS_CONSTRAINT)
self.start = model_random.randint_constrained(steps_constraint)
self.end = model_random.randint_constrained(steps_constraint)
angle_constraint = cpool.get(self, ANGLE_CONSTRAINT)
self.angle = model_random.uniform_constrained(angle_constraint)
c_constraint = cpool.get(self, C_CONSTRAINT)
self.c = model_random.uniform_constrained(c_constraint)
def mutate(self):
"""Mutate"""
cpool = model_constraintpool.ConstraintPool.get_pool()
x_center_constraint = cpool.get(self, X_CENTER_CONSTRAINT)
self.x_center = model_random.jitter_constrained(self.x_center,
x_center_constraint)
y_center_constraint = cpool.get(self, Y_CENTER_CONSTRAINT)
self.y_center = model_random.jitter_constrained(self.y_center,
y_center_constraint)
steps_constraint = cpool.get(self, STEPS_CONSTRAINT)
if model_random.is_mutating():
self.start = model_random.jitter_discret_constrained(self.start,
steps_constraint)
if model_random.is_mutating():
self.end = model_random.jitter_discret_constrained(self.end,
steps_constraint)
angle_constraint = cpool.get(self, ANGLE_CONSTRAINT)
self.angle = model_random.jitter_constrained(self.angle, angle_constraint)
c_constraint = cpool.get(self, C_CONSTRAINT)
self.c = model_random.jitter_constrained(self.c, c_constraint)
def swap_places(self):
"""Exchange x- and y-center."""
self.x_center, self.y_center = model_random.swap_parameters(self.x_center,
self.y_center)
def crossingover(self, other):
"""
pre: isinstance(other, FermatSpiralSampler)
pre: isinstance(self, FermatSpiralSampler)
# check for distinct references, needs to copy content, not references
post: __return__ is not self
post: __return__ is not other
post: model_locus.unique_check(__return__, self, other) == ''
"""
new_one = FermatSpiralSampler(self.get_trunk())
cross_sequence = model_random.crossing_sequence(6)
new_one.x_center = self.x_center if cross_sequence[0] else other.x_center
new_one.y_center = self.y_center if cross_sequence[1] else other.y_center
new_one.start = self.start if cross_sequence[2] else other.start
new_one.end = self.end if cross_sequence[3] else other.end
new_one.angle = self.angle if cross_sequence[4] else other.angle
new_one.c = self.c if cross_sequence[5] else other.c
return new_one
def get_sample_points(self):
"""Produces a list of sampling points.
"""
sample_points = []
ox, oy = self.x_center, self.y_center
stepping = range(self.start, self.end+1) if self.start < self.end \
else range(self.end, self.start-1, -1)
for n in stepping:
phi = n * self.angle
r = self.c * math.sqrt(math.fabs(n))
x = ox + r * math.cos(phi)
y = oy + r * math.sin(phi)
if math.fabs(x) < 1000 and math.fabs(y) < 1000:
sample_points.append( (x, y) )
return sample_points
def get_sample_extent(self):
"""'Size' of one sample as a fraction of 1.
"""
diff = self.end - self.start if self.start < self.end \
else self.start - self.end
size = 1.0 if diff == 0 else 1.0/diff
return size, size
def explain(self):
"""
post: len(__return__) == 3
"""
head = _("Fermat's spiral sampler: center=%f,%f, start steps=%d, end steps=%d, radian=%f, scaling=%f") \
% (self.x_center, self.y_center,
self.start, self.end, self.angle, self.c)
return ka_utils.explain_points(head, self.get_sample_points())
def copy(self):
"""A copy constructor.
post: isinstance(__return__, FermatSpiralSampler)
# check for distinct references, needs to copy content, not references
post: __return__ is not self
"""
new_one = FermatSpiralSampler(self.get_trunk())
new_one.x_center = self.x_center
new_one.y_center = self.y_center
new_one.start = self.start
new_one.end = self.end
new_one.angle = self.angle
new_one.c = self.c
return new_one
|
