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#include "palette.h"
#include <algorithm>
const std::vector<Magick::ColorRGB> palette::reds = {
{"#ff4848"}, {"#ff7575"}, {"#ff8a8a"}, {"#ff9797"}, {"#ffa8a8"}, {"#ffbbbb"}
};
const std::vector<Magick::ColorRGB> palette::oranges = {
{"#ffbf85"}, {"#ffcfa4"}, {"#ffbd82"}, {"#ffc48e"}
};
const std::vector<Magick::ColorRGB> palette::yellows = {
{"#fdfda5"}, {"#eff0ac"}, {"#fef495"}
};
const std::vector<Magick::ColorRGB> palette::greens = {
{"#c6fcb4"}, {"#d4ffa2"}, {"#93eeaa"}
};
const std::vector<Magick::ColorRGB> palette::blues = {
{"#62d0ff"}, {"#62a9ff"}, {"#63e9fc"}, {"#7bcae1"}, {"#92fef9"}
};
const std::vector<Magick::ColorRGB> palette::purples = {
{"#dfb0fe"}, {"#b0a7f1"}, {"#ff86ff"}, {"#ffacec"}, {"#ff86c2"}, {"#ea8dfe"}
};
palette::palette(std::vector<Magick::Color> foci)
{
if (foci.size() < 1)
{
throw std::invalid_argument("Must have at least one focus");
}
if (foci.size() < 2)
{
// Degenerate scenario, but deal with it gracefully.
foci.push_back(foci.front());
}
int sections = foci.size() - 1;
double sectionSize = 256.0 / static_cast<double>(sections);
for (int i=0; i<256; i++)
{
int section = std::floor(static_cast<double>(i) / sectionSize);
double interpolation = (static_cast<double>(i) / sectionSize) - section;
Magick::ColorHSL interpLeft = foci[section];
Magick::ColorHSL interpRight = foci[section+1];
double newHue;
double diff = interpRight.hue() - interpLeft.hue();
if (diff < 0)
{
std::swap(interpLeft, interpRight);
diff = -diff;
interpolation = 1 - interpolation;
}
if (diff > 0.5)
{
newHue = 1.0 + interpLeft.hue()
* (interpolation * (interpRight.hue() - interpLeft.hue() - 1.0));
if (newHue > 1.0)
{
newHue -= 1.0;
}
} else {
newHue = interpLeft.hue() + interpolation * diff;
}
Magick::ColorHSL interpolated(
newHue,
((1.0 - interpolation) * interpLeft.saturation())
+ (interpolation * interpRight.saturation()),
((1.0 - interpolation) * interpLeft.luminosity())
+ (interpolation * interpRight.luminosity()));
gradient_.push_back(interpolated);
}
}
palette palette::randomPalette(std::mt19937& rng)
{
std::vector<Magick::Color> foci;
foci.push_back(reds[
std::uniform_int_distribution<int>(0, reds.size()-1)(rng)]);
foci.push_back(oranges[
std::uniform_int_distribution<int>(0, oranges.size()-1)(rng)]);
foci.push_back(yellows[
std::uniform_int_distribution<int>(0, yellows.size()-1)(rng)]);
foci.push_back(greens[
std::uniform_int_distribution<int>(0, greens.size()-1)(rng)]);
foci.push_back(blues[
std::uniform_int_distribution<int>(0, blues.size()-1)(rng)]);
foci.push_back(purples[
std::uniform_int_distribution<int>(0, purples.size()-1)(rng)]);
std::shuffle(std::begin(foci), std::end(foci), rng);
int origNum = foci.size();
int numOfFoci = std::uniform_int_distribution<int>(4, origNum)(rng);
for (int i=0; i<(origNum-numOfFoci); i++)
{
foci.pop_back();
}
foci.push_back(foci[0]);
return palette(std::move(foci));
}
Magick::Color palette::getColor(double shade) const
{
int index = std::min((int)floor(shade * 256.0), 255);
return gradient_[index];
}
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