scalarramplut.h

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#ifndef OPENSWMM_RENDER_SCALARRAMPLUT_H
#define OPENSWMM_RENDER_SCALARRAMPLUT_H
 
#include <QtGlobal>
 
#include <algorithm>
#include <cmath>
 
namespace OpenSWMM::Render
{
 
struct ScalarRampLut
{
    static constexpr int kSize = 256;
 
    [[nodiscard]] static double normalize(double value, double vMin, double vMax)
    {
        if (!(vMax > vMin) || std::isnan(value)) return 0.0;
        return std::clamp((value - vMin) / (vMax - vMin), 0.0, 1.0);
    }
 
    [[nodiscard]] static int indexFor(double value, double vMin, double vMax)
    {
        return int(std::lround(normalize(value, vMin, vMax) * (kSize - 1)));
    }
 
    [[nodiscard]] static double positionForTexel(int i)
    {
        return double(std::clamp(i, 0, kSize - 1)) / double(kSize - 1);
    }
};
 
} // namespace OpenSWMM::Render
 
#endif // OPENSWMM_RENDER_SCALARRAMPLUT_H