color.h

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#pragma once
 
#include <cstdint>
#include <promeki/core/namespace.h>
#include <promeki/core/string.h>
 
PROMEKI_NAMESPACE_BEGIN
 
class Color {
        public:
                Color() = default;
 
                Color(uint8_t r, uint8_t g, uint8_t b, uint8_t a = 255)
                        : _r(r), _g(g), _b(b), _a(a), _valid(true) {}
 
                bool isValid() const { return _valid; }
 
                uint8_t r() const { return _r; }
 
                uint8_t g() const { return _g; }
 
                uint8_t b() const { return _b; }
 
                uint8_t a() const { return _a; }
 
                void setR(uint8_t val) { _r = val; }
 
                void setG(uint8_t val) { _g = val; }
 
                void setB(uint8_t val) { _b = val; }
 
                void setA(uint8_t val) { _a = val; }
 
                static Color fromHex(const String &hex);
 
                String toHex(bool includeAlpha = false) const;
 
                Color lerp(const Color &other, double t) const;
 
                Color inverted() const {
                        return Color(255 - _r, 255 - _g, 255 - _b, _a);
                }
 
                double luminance() const {
                        return (0.2126 * _r + 0.7152 * _g + 0.0722 * _b) / 255.0;
                }
 
                Color contrastingBW() const {
                        return luminance() > 0.5
                                ? Color(0, 0, 0, _a)
                                : Color(255, 255, 255, _a);
                }
 
                Color complementary() const;
 
                bool operator==(const Color &other) const {
                        return _r == other._r && _g == other._g &&
                               _b == other._b && _a == other._a;
                }
 
                bool operator!=(const Color &other) const {
                        return !(*this == other);
                }
 
                // Named color constants
                static const Color Black;
                static const Color White;
                static const Color Red;
                static const Color Green;
                static const Color Blue;
                static const Color Yellow;
                static const Color Cyan;
                static const Color Magenta;
                static const Color DarkGray;
                static const Color LightGray;
                static const Color Orange;
                static const Color Transparent;
                static const Color Ignored;
 
        private:
                uint8_t _r = 0;
                uint8_t _g = 0;
                uint8_t _b = 0;
                uint8_t _a = 0;
                bool    _valid = false;
};
 
PROMEKI_NAMESPACE_END