gradient_paint.inl

 
 
namespace glm
{
    template<typename T, qualifier Q>
    GLM_FUNC_QUALIFIER T radialGradient
    (
        vec<2, T, Q> const& Center,
        T const& Radius,
        vec<2, T, Q> const& Focal,
        vec<2, T, Q> const& Position
    )
    {
        vec<2, T, Q> F = Focal - Center;
        vec<2, T, Q> D = Position - Focal;
        T Radius2 = pow2(Radius);
        T Fx2 = pow2(F.x);
        T Fy2 = pow2(F.y);
 
        T Numerator = (D.x * F.x + D.y * F.y) + sqrt(Radius2 * (pow2(D.x) + pow2(D.y)) - pow2(D.x * F.y - D.y * F.x));
        T Denominator = Radius2 - (Fx2 + Fy2);
        return Numerator / Denominator;
    }
 
    template<typename T, qualifier Q>
    GLM_FUNC_QUALIFIER T linearGradient
    (
        vec<2, T, Q> const& Point0,
        vec<2, T, Q> const& Point1,
        vec<2, T, Q> const& Position
    )
    {
        vec<2, T, Q> Dist = Point1 - Point0;
        return (Dist.x * (Position.x - Point0.x) + Dist.y * (Position.y - Point0.y)) / glm::dot(Dist, Dist);
    }
}//namespace glm