colormap-shaders
A collection of shaders to draw color map like this:
.
usage
Each *.frag shader sources provides a colormap function, which takes an float argument x (x should be: 0.0 <= x <= 1.0). The colormap function returns a vec4 value which represents an RGBA color.
vec4 colormap(float x);
void main() {
gl_FragColor = colormap(gl_TexCoord[0].x);
}
/* include "shaders/rainbow.frag" here, for example. */
special case
gnuplot.frag
This shader emulates gnuplot's rgbformulae, and the signature of colormap is:
vec4 colormap(float x, int red_type, int green_type, int blue_type);
It takes additional 3 arguments, with same meanings to rgbformulae's 3 arguments respectively.
usage from c++
#include <colormap/colormap.h>
#include <iostream>
int main()
{
using namespace colormap;
// Print RGB table of MATLAB::Jet colormap.
MATLAB::Jet jet;
std::cout << "category: " << jet.getCategory() << std::endl;
std::cout << "title: " << jet.getTitle() << std::endl;
int const size = 256;
for (int i = 0; i < size; ++i) {
float const x = i / (float)size;
Color c = jet.getColor(x);
std::cout << x << "\t" << c.r << "\t" << c.g << "\t" << c.b << std::endl;
}
// Dump category and title of all colormaps.
for (std::shared_ptr<Colormap const> const& c : ColormapList::getAll()) {
std::cout << c->getCategory() << " : " << c->getTitle() << std::endl;
}
return 0;
}samples
MATLAB
| name | sample |
|---|---|
| MATLAB_autumn |  |
| MATLAB_bone |  |
| MATLAB_cool |  |
| MATLAB_copper |  |
| MATLAB_hot |  |
| MATLAB_hsv |  |
| MATLAB_jet |  |
| MATLAB_parula |  |
| MATLAB_pink |  |
| MATLAB_spring |  |
| MATLAB_summer |  |
| MATLAB_winter |  |
gnuplot
| name | sample |
|---|---|
| rgbformulae(7, 5, 15) |  |
| rgbformulae(3, 11, 6) |  |
| rgbformulae(23, 28, 3) |  |
| rgbformulae(21, 22, 23) |  |
| rgbformulae(30, 31, 32) |  |
| rgbformulae(33, 13, 10) |  |
| rgbformulae(34, 35, 36) |  |
IDL
| name | sample |
|---|---|
| IDL_Black-White_Linear |  |
| IDL_Blue-White_Linear |  |
| IDL_Green-Red-Blue-White |  |
| IDL_Red_Temperature |  |
| IDL_Blue-Green-Red-Yellow |  |
| IDL_Standard_Gamma-II |  |
| IDL_Prism |  |
| IDL_Red-Purple |  |
| IDL_Green-White_Linear |  |
| IDL_Green-White_Exponential |  |
| IDL_Green-Pink |  |
| IDL_Blue-Red |  |
| IDL_16_Level |  |
| IDL_Rainbow |  |
| IDL_Steps |  |
| IDL_Stern_Special |  |
| IDL_Haze |  |
| IDL_Blue-Pastel-Red |  |
| IDL_Pastels |  |
| IDL_Hue_Sat_Lightness_1 |  |
| IDL_Hue_Sat_Lightness_2 |  |
| IDL_Hue_Sat_Value_1 |  |
| IDL_Hue_Sat_Value_2 |  |
| IDL_Purple-Red+Stripes |  |
| IDL_Beach |  |
| IDL_Mac_Style |  |
| IDL_Eos_A |  |
| IDL_Eos_B |  |
| IDL_Hardcandy |  |
| IDL_Nature |  |
| IDL_Ocean |  |
| IDL_Peppermint |  |
| IDL_Plasma |  |
| IDL_Blue-Red_2 |  |
| IDL_Rainbow_2 |  |
| IDL_Blue_Waves |  |
| IDL_Volcano |  |
| IDL_Waves |  |
| IDL_Rainbow_18 |  |
| IDL_Rainbow+White |  |
| IDL_Rainbow+Black |  |
| IDL_CB-Accent |  |
| IDL_CB-Dark2 |  |
| IDL_CB-Paired |  |
| IDL_CB-Pastel1 |  |
| IDL_CB-Pastel2 |  |
| IDL_CB-Set1 |  |
| IDL_CB-Set2 |  |
| IDL_CB-Set3 |  |
| IDL_CB-Blues |  |
| IDL_CB-BuGn |  |
| IDL_CB-BuPu |  |
| IDL_CB-GnBu |  |
| IDL_CB-Greens |  |
| IDL_CB-Greys |  |
| IDL_CB-Oranges |  |
| IDL_CB-OrRd |  |
| IDL_CB-PuBu |  |
| IDL_CB-PuBuGn |  |
| IDL_CB-PuRdn |  |
| IDL_CB-Purples |  |
| IDL_CB-RdPu |  |
| IDL_CB-Reds |  |
| IDL_CB-YIGn |  |
| IDL_CB-YIGnBu |  |
| IDL_CB-YIOrBr |  |
| IDL_CB-BrBG |  |
| IDL_CB-PiYG |  |
| IDL_CB-PRGn |  |
| IDL_CB-PuOr |  |
| IDL_CB-RdBu |  |
| IDL_CB-RdGy |  |
| IDL_CB-RdYiBu |  |
| IDL_CB-RdYiGn |  |
| IDL_CB-Spectral |  |
transform
| name | sample |
|---|---|
| transform_rainbow | |
| transform_apricot |  |
| transform_carnation |  |
| transform_ether |  |
| transform_grayscale_banded |  |
| transform_hot_metal |  |
| transform_lava_waves |  |
| transform_malachite |  |
| transform_seismic |  |
| transform_space |  |
| transform_morning_glory |  |
| transform_peanut_butter_and_jerry |  |
| transform_purple_haze |  |
| transform_rose |  |
| transform_saturn |  |
| transform_supernova |  |
kbinani
| name | sample |
|---|---|
| kbinani_altitude |  |
license
The MIT License. See 'LICENSE' file for detail.