Catcrafts/Crafter.Graphics
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integer math

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This commit is contained in:
Jorijn van der Graaf 2025-11-23 04:04:53 +01:00
commit 5ff43e240c
27 changed files with 922 additions and 1011 deletions
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80
interfaces/Crafter.Graphics-Types.cppm
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@ -23,8 +23,8 @@ import std;
namespace Crafter {
export struct MousePoint {
double x;
double y;
std::uint_fast32_t x;
std::uint_fast32_t y;
};
export struct MouseMoveEvent {
@ -94,4 +94,80 @@ namespace Crafter {
float b;
float a;
};
export constexpr std::int_fast32_t BOUND = 9;
export constexpr std::int_fast32_t SCALE = std::numeric_limits<std::int_fast32_t>::max() / BOUND;
export constexpr double SCALEDOUBLE = static_cast<double>(std::numeric_limits<std::int_fast32_t>::max()) / BOUND;
export constexpr std::int_fast32_t FractionalToMapped(double f) {
return std::int_fast32_t(f * SCALEDOUBLE);
}
export constexpr std::int_fast32_t MappedToPixel(std::int_fast32_t mapped, std::int_fast32_t width) {
return mapped / (SCALE / width);
}
export constexpr double MappedToFractional(std::int_fast32_t mapped) {
return static_cast<double>(mapped) / SCALEDOUBLE;
}
export constexpr std::int_fast32_t PixelToMapped(std::int_fast32_t pixel, std::int_fast32_t width) {
return pixel * (SCALE / width);
}
// export constexpr double bound = 10;
// export constexpr std::uint_fast32_t FractionalToMapped(double fractional) {
// constexpr double min_x = -bound;
// constexpr double max_x = bound + 1.0;
// constexpr double range_x = max_x - min_x;
// constexpr double MAXD = static_cast<double>(
// std::numeric_limits<std::uint_fast32_t>::max()
// );
// // Normalize to [0,1]
// double t = (fractional - min_x) / range_x;
// // Clamp (important for constexpr safety and edge behavior)
// if (t < 0.0) t = 0.0;
// if (t > 1.0) t = 1.0;
// return static_cast<std::uint_fast32_t>(t * MAXD);
// }
// export constexpr double MappedToFractional(std::uint_fast32_t mapped) {
// constexpr double min_x = -bound;
// constexpr double max_x = bound + 1.0;
// constexpr double range_x = max_x - min_x;
// constexpr double MAXD = static_cast<double>(
// std::numeric_limits<std::uint_fast32_t>::max()
// );
// double t = static_cast<double>(mapped) / MAXD;
// return min_x + t * range_x;
// }
// export constexpr std::int_fast32_t MappedToPixel(std::uint_fast32_t mapped, std::uint_fast32_t size) {
// constexpr double MAXD = static_cast<double>(
// std::numeric_limits<std::uint_fast32_t>::max()
// );
// // scale mapped ∈ [0, MAX] to pixel ∈ [0, size]
// double t = static_cast<double>(mapped) / MAXD;
// // Clamp (shouldn't be necessary, but protects constexpr eval)
// if (t < 0.0) t = 0.0;
// if (t > 1.0) t = 1.0;
// return static_cast<std::int_fast32_t>(t * static_cast<double>(size));
// }
export constexpr std::uint_fast32_t PixelToMapped(double pixel, std::uint_fast32_t size) {
return static_cast<std::uint_fast32_t>((pixel / size) * static_cast<double>((std::numeric_limits<std::uint_fast32_t>::max() / 10)));
}
}