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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
|
/*
Copyright (C) 2019 Leo Tenenbaum
This file is part of AutoArt.
AutoArt 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.
AutoArt 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 AutoArt. If not, see <https://www.gnu.org/licenses/>.
*/
package autoart
import (
"image"
"image/color"
"math"
"math/rand"
"fmt"
"github.com/pommicket/autoart/autoutils"
)
const (
XY = iota
RTHETA
)
const (
RGB = iota
GRAYSCALE
CMYK
HSV
YCbCr
)
const (
MOD = iota
CLAMP
SIGMOID
)
type Config struct {
FunctionLength int
ColorSpace int
CoordinateSys int
Alpha bool
Rectifier int // What to do with out-of-bounds values
}
func sigmoid(x float64) float64 {
return 1 / (1 + math.Exp(-x))
}
func rectify(x float64, rectifier int) float64 {
switch rectifier {
case MOD:
return math.Mod(x, 1)
case CLAMP:
if x > 1 {
return 1
} else if x < 0 {
return 0
}
case SIGMOID:
return sigmoid(x)
}
return 0
}
func (conf *Config) nFunctions() int {
a := 0
if conf.Alpha { a = 1 }
switch conf.ColorSpace {
case GRAYSCALE:
return a + 1
case RGB, HSV, YCbCr:
return a + 3
case CMYK:
return a + 4
}
panic("Invalid color space!")
return a
}
const defaultFunctionLength = 40
func GenerateImageFromFunctions(width int, height int, config Config,
functions []autoutils.Function,
vars []float64) image.Image {
var rect = image.Rectangle{image.Point{0, 0}, image.Point{width, height}}
img := image.NewRGBA(rect)
colorSpace := config.ColorSpace
alpha := config.Alpha
rectifier := config.Rectifier
nfunctions := len(functions)
rets := make([]uint8, nfunctions)
fwidth, fheight := float64(width), float64(height)
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
switch config.CoordinateSys {
case XY:
vars[0], vars[1] = float64(x)/fwidth, float64(y)/fheight
case RTHETA:
dx, dy := float64(x - width/2), float64(y - height/2)
vars[0] = math.Sqrt(dx * dx + dy * dy) / ((fwidth+fheight)/2) // r
vars[1] = math.Atan2(dy, dx) // theta
}
for i := range rets {
ret := rectify(functions[i].Evaluate(vars), rectifier)
rets[i] = uint8(255 * ret)
}
var r, g, b, a uint8
a = 255
switch (colorSpace) {
case RGB:
r, g, b = rets[0], rets[1], rets[2]
case GRAYSCALE:
r, g, b = rets[0], rets[0], rets[0]
case CMYK:
r, g, b = color.CMYKToRGB(rets[0], rets[1], rets[2], rets[3])
case HSV:
r, g, b = autoutils.HSVToRGB(rets[0], rets[1], rets[2])
case YCbCr:
r, g, b = color.YCbCrToRGB(rets[0], rets[1], rets[2])
}
if (alpha) {
a = rets[nfunctions-1]
}
img.Set(x, y, color.RGBA{r, g, b, a})
}
}
return img
}
func GenerateImage(width int, height int, config Config) image.Image {
if config.FunctionLength == 0 {
// 0 value of config shouldn't have empty functions
config.FunctionLength = defaultFunctionLength
}
functionLength := config.FunctionLength
nfunctions := config.nFunctions()
functions := make([]autoutils.Function, nfunctions)
for i := range functions {
functions[i].Generate(2, functionLength)
}
vars := []float64{0, 0}
return GenerateImageFromFunctions(width, height, config, functions, vars)
}
func GenerateImages(width int, height int, config Config, number int, verbose bool) []image.Image {
c := make(chan image.Image)
for i := 0; i < number; i++ {
go func () {
c <- GenerateImage(width, height, config)
}()
}
imgs := make([]image.Image, number)
for i := range imgs {
imgs[i] = <-c
if verbose {
fmt.Println("Generating images...", i+1, "/", number)
}
}
return imgs
}
type PaletteConfig struct {
NColors int
Alpha bool
FunctionLength int
CoordinateSys int
}
func GenerateImagePaletteFrom(width int, height int, conf PaletteConfig,
funcs []autoutils.Function, vars []float64,
palette []color.RGBA) image.Image {
img := image.NewRGBA(image.Rectangle{image.Point{0,0}, image.Point{width, height}})
fwidth, fheight := float64(width), float64(height)
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
switch conf.CoordinateSys {
case XY:
vars[0], vars[1] = float64(x)/fwidth, float64(y)/fheight
case RTHETA:
dx, dy := float64(x - width/2), float64(y - height/2)
vars[0] = math.Sqrt(dx * dx + dy * dy) / ((fwidth+fheight)/2) // r
vars[1] = math.Atan2(dy, dx) // theta
}
for i := range palette {
if i == conf.NColors - 1 {
// Background color
img.Set(x, y, palette[i])
} else if funcs[i].Evaluate(vars) < 0 {
img.Set(x, y, palette[i])
break
}
}
}
}
return img
}
func GenerateImagePalette(width int, height int, conf PaletteConfig) image.Image {
nColors := conf.NColors
alpha := conf.Alpha
functionLength := conf.FunctionLength
funcs := make([]autoutils.Function, nColors - 1)
palette := make([]color.RGBA, nColors)
// Choose palette
for i := range palette {
r, g, b := rand.Intn(256), rand.Intn(256), rand.Intn(256)
var a int
if alpha {
a = rand.Intn(256)
} else {
a = 255
}
palette[i] = color.RGBA{uint8(r), uint8(g), uint8(b), uint8(a)}
}
// Choose functions
for i := range funcs {
funcs[i].Generate(2, functionLength)
}
vars := make([]float64, 2)
return GenerateImagePaletteFrom(width, height, conf, funcs, vars, palette)
}
func GenerateImagesPalette(width int, height int, conf PaletteConfig, number int, verbose bool) []image.Image {
c := make(chan image.Image)
for i := 0; i < number; i++ {
go func() {
c <- GenerateImagePalette(width, height, conf)
}()
}
images := make([]image.Image, number)
for i := 0; i < number; i++ {
images[i] = <-c
if verbose {
fmt.Println("Generating images...", i+1, "/", number)
}
}
return images
}
|
