/glm/gtx/gradient_paint.inl

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// OpenGL Mathematics Copyright (c) 2005 - 2012 G-Truc Creation (www.g-truc.net)

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// Created : 2009-03-06

// Updated : 2009-03-09

// Licence : This source is under MIT License

// File    : glm/gtx/gradient_paint.inl

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namespace glm

{

	template <typename valType>

	valType radialGradient

	(

		detail::tvec2<valType> const & Center,

		valType const & Radius,

		detail::tvec2<valType> const & Focal,

		detail::tvec2<valType> const & Position

	)

	{

		detail::tvec2<valType> F = Focal - Center;

		detail::tvec2<valType> D = Position - Focal;

		valType Radius2 = pow2(Radius);

		valType Fx2 = pow2(F.x);

		valType Fy2 = pow2(F.y);



		valType 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));

		valType Denominator = Radius2 - (Fx2 + Fy2);

		return Numerator / Denominator;

	}



	template <typename valType>

	valType linearGradient

	(

		detail::tvec2<valType> const & Point0,

		detail::tvec2<valType> const & Point1,

		detail::tvec2<valType> const & Position

	)

	{

		detail::tvec2<valType> Dist = Point1 - Point0;

		return (Dist.x * (Position.x - Point0.x) + Dist.y * (Position.y - Point0.y)) / glm::dot(Dist, Dist);

	}

}//namespace glm