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43 lines
1.4 KiB
43 lines
1.4 KiB
/////////////////////////////////////////////////////////////////////////////////////////////////// |
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// OpenGL Mathematics Copyright (c) 2005 - 2013 G-Truc Creation (www.g-truc.net) |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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// Created : 2009-03-06 |
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// Updated : 2013-04-09 |
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// Licence : This source is under MIT License |
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// File : glm/gtx/gradient_paint.inl |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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namespace glm |
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{ |
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template <typename T, precision P> |
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T radialGradient |
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( |
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detail::tvec2<T, P> const & Center, |
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T const & Radius, |
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detail::tvec2<T, P> const & Focal, |
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detail::tvec2<T, P> const & Position |
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) |
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{ |
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detail::tvec2<T, P> F = Focal - Center; |
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detail::tvec2<T, P> D = Position - Focal; |
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T Radius2 = pow2(Radius); |
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T Fx2 = pow2(F.x); |
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T Fy2 = pow2(F.y); |
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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)); |
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T Denominator = Radius2 - (Fx2 + Fy2); |
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return Numerator / Denominator; |
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} |
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template <typename T, precision P> |
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T linearGradient |
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( |
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detail::tvec2<T, P> const & Point0, |
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detail::tvec2<T, P> const & Point1, |
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detail::tvec2<T, P> const & Position |
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) |
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{ |
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detail::tvec2<T, P> Dist = Point1 - Point0; |
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return (Dist.x * (Position.x - Point0.x) + Dist.y * (Position.y - Point0.y)) / glm::dot(Dist, Dist); |
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} |
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}//namespace glm
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