| 1 | /// @ref gtx_gradient_paint |
| 2 | |
| 3 | namespace glm |
| 4 | { |
| 5 | template<typename T, qualifier Q> |
| 6 | GLM_FUNC_QUALIFIER T radialGradient |
| 7 | ( |
| 8 | vec<2, T, Q> const& Center, |
| 9 | T const& Radius, |
| 10 | vec<2, T, Q> const& Focal, |
| 11 | vec<2, T, Q> const& Position |
| 12 | ) |
| 13 | { |
| 14 | vec<2, T, Q> F = Focal - Center; |
| 15 | vec<2, T, Q> D = Position - Focal; |
| 16 | T Radius2 = pow2(Radius); |
| 17 | T Fx2 = pow2(F.x); |
| 18 | T Fy2 = pow2(F.y); |
| 19 | |
| 20 | 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)); |
| 21 | T Denominator = Radius2 - (Fx2 + Fy2); |
| 22 | return Numerator / Denominator; |
| 23 | } |
| 24 | |
| 25 | template<typename T, qualifier Q> |
| 26 | GLM_FUNC_QUALIFIER T linearGradient |
| 27 | ( |
| 28 | vec<2, T, Q> const& Point0, |
| 29 | vec<2, T, Q> const& Point1, |
| 30 | vec<2, T, Q> const& Position |
| 31 | ) |
| 32 | { |
| 33 | vec<2, T, Q> Dist = Point1 - Point0; |
| 34 | return (Dist.x * (Position.x - Point0.x) + Dist.y * (Position.y - Point0.y)) / glm::dot(Dist, Dist); |
| 35 | } |
| 36 | }//namespace glm |