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
|
/*
* Copyright (c) 2020-2021 Vasile Vilvoiu <vasi@vilvoiu.ro>
*
* specgram is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#include "color-map.hpp"
#include <cmath>
#include <cassert>
std::unique_ptr<ColorMap>
ColorMap::Build(ColorMapType type, const sf::Color& bg_color, const sf::Color& custom_color)
{
/* colormaps are not allowed to be translucent */
sf::Color opaque_bg_color(bg_color.r, bg_color.g, bg_color.b, 255);
sf::Color opaque_custom_color(custom_color.r, custom_color.g, custom_color.b, 255);
switch (type) {
case ColorMapType::kJet:
return std::make_unique<JetColorMap>();
case ColorMapType::kHot:
return std::make_unique<HotColorMap>();
case ColorMapType::kInferno:
return std::make_unique<InfernoColorMap>();
case ColorMapType::kGray:
return std::make_unique<TwoColorMap>(sf::Color::Black, sf::Color::White);
case ColorMapType::kPurple:
return std::make_unique<ThreeColorMap>(sf::Color::Black, sf::Color(204, 51, 255, 255), sf::Color::White);
case ColorMapType::kBlue:
return std::make_unique<ThreeColorMap>(sf::Color::Black, sf::Color(51, 51, 255, 255), sf::Color::White);
case ColorMapType::kGreen:
return std::make_unique<ThreeColorMap>(sf::Color::Black, sf::Color(0, 150, 0, 255), sf::Color::White);
case ColorMapType::kOrange:
return std::make_unique<ThreeColorMap>(sf::Color::Black, sf::Color(255, 102, 0, 255), sf::Color::White);
case ColorMapType::kRed:
return std::make_unique<ThreeColorMap>(sf::Color::Black, sf::Color(230, 0, 0, 255), sf::Color::White);
case ColorMapType::kCustom:
return std::make_unique<TwoColorMap>(opaque_bg_color, opaque_custom_color);
default:
throw std::runtime_error("unknown color map");
}
}
std::vector<uint8_t>
ColorMap::Gradient(std::size_t width) const
{
RealWindow values;
values.resize(width);
for (std::size_t i = 0; i < width; i++) {
values[i] = (double) i / (double) (width-1);
}
return this->Map(values);
}
InterpolationColorMap::InterpolationColorMap(const std::vector<sf::Color>& colors,
const std::vector<double>& vals) : colors_(colors), values_(vals)
{
/* respect boundaries */
if (vals.size() != colors.size()) {
throw std::runtime_error("number of boundaries and number of colors differ");
}
if (vals.size() < 2) {
throw std::runtime_error("at least two colors needed in a colormap");
}
if (vals[0] != 0.0f) {
throw std::runtime_error("first colormap boundary must be 0.0");
}
if (vals[vals.size()-1] != 1.0f) {
throw std::runtime_error("last colormap boundary must be 1.0");
}
for (std::size_t i = 0; i < vals.size()-1; i++) {
if (vals[i] >= vals[i+1]) {
throw std::runtime_error("boundaries must be ascending");
}
}
}
std::vector<uint8_t>
InterpolationColorMap::GetColor(double value) const
{
if ((value < 0.0f) || (value > 1.0f)) {
throw std::runtime_error("input value outside of colormap domain");
}
std::size_t k = 0;
while (value > this->values_[k+1]) {
k++;
assert(k < (this->values_.size()-1));
}
double fu = (value - this->values_[k]) / (this->values_[k+1] - this->values_[k]);
double fl = 1.0f - fu;
return {
static_cast<uint8_t>(std::round(fl * this->colors_[k].r + fu * this->colors_[k+1].r)),
static_cast<uint8_t>(std::round(fl * this->colors_[k].g + fu * this->colors_[k+1].g)),
static_cast<uint8_t>(std::round(fl * this->colors_[k].b + fu * this->colors_[k+1].b)),
static_cast<uint8_t>(std::round(fl * this->colors_[k].a + fu * this->colors_[k+1].a)),
};
}
std::vector<uint8_t>
InterpolationColorMap::Map(const RealWindow& input) const
{
std::vector<uint8_t> output;
output.resize(input.size() * 4);
for (std::size_t i = 0; i < input.size(); i++) {
auto color = this->GetColor(input[i]);
assert(color.size() == 4);
output[i * 4 + 0] = color[0];
output[i * 4 + 1] = color[1];
output[i * 4 + 2] = color[2];
output[i * 4 + 3] = color[3];
}
return output;
}
std::unique_ptr<ColorMap> InterpolationColorMap::Copy() const
{
return std::make_unique<InterpolationColorMap>(colors_, values_);
}
TwoColorMap::TwoColorMap(const sf::Color& c1, const sf::Color& c2)
: InterpolationColorMap({ c1, c2 }, { 0.0f, 1.0f })
{
}
ThreeColorMap::ThreeColorMap(const sf::Color& c1, const sf::Color& c2, const sf::Color& c3)
: InterpolationColorMap({ c1, c2, c3 }, { 0.0f, 0.5f, 1.0f })
{
}
JetColorMap::JetColorMap() : InterpolationColorMap(
{ /* MATLAB jet colormap */
sf::Color(0, 0, 143, 255),
sf::Color(0, 0, 255, 255),
sf::Color(0, 255, 255, 255),
sf::Color(255, 255, 0, 255),
sf::Color(255, 127, 0, 255),
sf::Color(255, 0, 0, 255),
sf::Color(127, 0, 0, 255),
},
{ 0.0f, 1.0f / 9.0f, 23.0f / 63.0f, 13.0f / 21.0f, 47.0f / 63.0f, 55.0 / 63.0, 1.0f }
)
{
}
HotColorMap::HotColorMap() : InterpolationColorMap(
{
sf::Color(0, 0, 0, 255),
sf::Color(255, 0, 0, 255),
sf::Color(255, 255, 0, 255),
sf::Color(255, 255, 255, 255),
},
{ 0.0f, 1.0f / 3.0f, 2.0f / 3.0f, 1.0f }
)
{
}
InfernoColorMap::InfernoColorMap() : InterpolationColorMap(
{
sf::Color(0, 0, 0, 255),
sf::Color(40, 11, 84, 255),
sf::Color(101, 21, 110, 255),
sf::Color(159, 42, 99, 255),
sf::Color(212, 72, 66, 255),
sf::Color(245, 125, 21, 255),
sf::Color(250, 193, 39, 255),
sf::Color(252, 255, 164, 255),
},
{
0.0f,
0.142857142857143f,
0.285714285714286f,
0.428571428571429f,
0.571428571428571f,
0.714285714285714f,
0.857142857142857f,
1.0f
}
)
{
}
|
