math_functions.hpp

#ifndef PASTELSYS_MATH_FUNCTIONS_HPP
#define PASTELSYS_MATH_FUNCTIONS_HPP

#include "pastel/sys/math_functions.h"
#include "pastel/sys/vector/vector_tools.h"

namespace Pastel
{

    template <typename Real>
    Real signedArea(
        const Vector<Real, 2>& a,
        const Vector<Real, 2>& b,
        const Vector<Real, 2>& c)
    {
        return 0.5 * dot(cross(b - a), c - a);
    }

    template <typename Real>
    void realToReal(
        const Real& x,
        const NoDeduction<Real>& fromMin, 
        const NoDeduction<Real>& fromMax,
        const NoDeduction<Real>& toMin, 
        const NoDeduction<Real>& toMax)
    {
        Real fromDelta = fromMax - fromMin;
        Real toDelta = toMax - toMin;

        return toMin + ((x - fromMin) / fromDelta) * toDelta;
    }

}

#endif