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/*
* api/colour-functions.cc
*
* Copyright 2020 by Medical Research Council
* Author: Paul Emsley
*
* This file is part of Coot
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser 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 Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*/
#include "utils/colour-holder.hh"
#include "colour-functions.hh"
// amount is not in degrees, it is in fractions of a circle, e.g. 10/360.
//
std::vector<float> rotate_rgb(std::vector<float> &rgb, float amount) {
#if 0
if (true) { // print a rotation to colour table
int n_cols = 100; // either side
for (int i = -n_cols; i<n_cols; i++) {
float rotation_size = 0.01f * static_cast<float>(i);
std::vector<float> orig_colours = { 0.0f, 0.8f, 0.0f };
std::vector<float> rgb_new = rotate_rgb(orig_colours, rotation_size);
std::cout << "debug colours::" << rgb_new[0] << " " << rgb_new[1] << " " << rgb_new[2]
<< " using rotation_size " << rotation_size << std::endl;
}
// Result:
//
// if we start at solid green then rotation_size for "no rotation" is 0.0
// rotation_size for full rotation is -0.33 (solid red)
}
#endif
std::vector<float> hsv = coot::convert_rgb_to_hsv(rgb);
// add 20 degrees to hue (or whatever)
// std::cout << "adding " << amount << " to hue " << std::endl;
hsv[0] += amount;
while (hsv[0] > 1.0) {
hsv[0] -= 1.0;
}
std::vector<float> r = coot::convert_hsv_to_rgb(hsv);
// std::cout << "rotate from ("
// << rgb[0] << " " << rgb[1] << " " << rgb[2] << ")\n"
// << " to ("
// << rgb[0] << " " << rgb[1] << " " << rgb[2] << ")\n";
return r;
// return convert_hsv_to_rgb(hsv);
}
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