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62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
#include "color.hpp"
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#include <algorithm>
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#include <array>
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#include <charconv>
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#include <sstream>
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#include <system_error>
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namespace Misc
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{
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Color::Color(float r, float g, float b, float a)
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: mR(std::clamp(r, 0.f, 1.f))
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, mG(std::clamp(g, 0.f, 1.f))
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, mB(std::clamp(b, 0.f, 1.f))
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, mA(std::clamp(a, 0.f, 1.f))
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{
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}
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std::string Color::toString() const
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{
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std::ostringstream ss;
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ss << "(" << r() << ", " << g() << ", " << b() << ", " << a() << ')';
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return ss.str();
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}
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Color Color::fromHex(std::string_view hex)
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{
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if (hex.size() != 6)
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throw std::logic_error(std::string("Invalid hex color: ") += hex);
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std::array<float, 3> rgb;
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for (size_t i = 0; i < rgb.size(); i++)
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{
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auto sub = hex.substr(i * 2, 2);
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int v = 0;
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auto [_, ec] = std::from_chars(sub.data(), sub.data() + sub.size(), v, 16);
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if (ec != std::errc())
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throw std::logic_error(std::string("Invalid hex color: ") += hex);
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rgb[i] = v / 255.0f;
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}
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return Color(rgb[0], rgb[1], rgb[2], 1);
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}
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std::string Color::toHex() const
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{
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std::string result(6, '0');
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std::array<float, 3> rgb = { mR, mG, mB };
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for (size_t i = 0; i < rgb.size(); i++)
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{
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int b = static_cast<int>(rgb[i] * 255.0f);
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auto [_, ec] = std::to_chars(result.data() + i * 2, result.data() + (i + 1) * 2, b, 16);
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if (ec != std::errc())
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throw std::logic_error("Error when converting number to base 16");
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}
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return result;
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}
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bool operator==(const Color& l, const Color& r)
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{
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return l.mR == r.mR && l.mG == r.mG && l.mB == r.mB && l.mA == r.mA;
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}
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}
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