| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| // OpenGL Mathematics Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net) |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| // Created : 2009-03-06 |
| // Updated : 2013-04-09 |
| // Licence : This source is under MIT License |
| // File : glm/gtx/gradient_paint.inl |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| namespace glm |
| { |
| template <typename T, precision P> |
| GLM_FUNC_QUALIFIER T radialGradient |
| ( |
| detail::tvec2<T, P> const & Center, |
| T const & Radius, |
| detail::tvec2<T, P> const & Focal, |
| detail::tvec2<T, P> const & Position |
| ) |
| { |
| detail::tvec2<T, P> F = Focal - Center; |
| detail::tvec2<T, P> 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, precision P> |
| GLM_FUNC_QUALIFIER T linearGradient |
| ( |
| detail::tvec2<T, P> const & Point0, |
| detail::tvec2<T, P> const & Point1, |
| detail::tvec2<T, P> const & Position |
| ) |
| { |
| detail::tvec2<T, P> Dist = Point1 - Point0; |
| return (Dist.x * (Position.x - Point0.x) + Dist.y * (Position.y - Point0.y)) / glm::dot(Dist, Dist); |
| } |
| }//namespace glm |
