poster/cppGTK/source/color.cpp

#include <stdint.h>
#include <cmath>
#include <iostream>
#include <string>
#include "color.hpp"

namespace cx_light {

color::color() {
    this->red = 0;
    this->green = 0;
    this->blue = 0;
}

color::~color() {}

color color::from_hex(long hex) {
    color target;

    target.red = ((hex & 0xFF0000) >> 16);
    target.green = ((hex & 0x00FF00) >> 8);
    target.blue = ((hex & 0x0000FF) >> 0);

    return target;
}

color color::from_rgb(uint8_t red, uint8_t green, uint8_t blue) {
    color target;
     
    target.red = red;
    target.green = green;
    target.blue = blue;

    return target;
}

color color::from_white(long temperature) {
    color target;

    temperature = temperature / 100;

    if (temperature <= 66) {
        target.red = 255;
        target.blue = 0;

        float green = 99.4708025861 * log(temperature) - 161.1195681661;
        
        green = green > 255 ? 255 : green;
        green = green < 0 ? 0 : green;
        target.green = green;

        if (temperature > 19) {
            float blue = temperature - 10;
            blue = 138.5177312231 * log(blue) - 305.0447927307;
        
            blue = blue > 255 ? 255 : blue;
            blue = blue < 0 ? 0 : blue;
            target.blue = blue;
        }
        
        return target;
    }

    float red = 329.698727446 * pow(temperature - 60, -0.1332047592);
    red = red > 255 ? 255 : red;
    red = red < 0 ? 0 : red;
    target.red = red;

    float green = 288.1221695283 * pow(temperature - 60, -0.0755148492 );
    green = green > 255 ? 255 : green;
    green = green < 0 ? 0 : green;
    target.green = green;

    target.blue = 255;

    return target;
}

void color::set_source(const Cairo::RefPtr<Cairo::Context> &context) {
    context->set_source_rgb(
        this->get_normalized_red(),
        this->get_normalized_green(),
        this->get_normalized_blue()
    );
}

uint8_t color::get_red() {
    return this->red;
}

uint8_t color::get_green() {
    return this->green;
}

uint8_t color::get_blue() {
    return this->blue;
}         

double color::get_normalized_red() {
    return ((double) this->red / 255);
}

double color::get_normalized_green() {
    return ((double) this->green / 255);
}

double color::get_normalized_blue() {
    return ((double) this->blue / 255);
}

}