37 lines
940 B
C++
37 lines
940 B
C++
/// @ref gtx_gradient_paint
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namespace glm
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{
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER T radialGradient
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(
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vec<2, T, Q> const& Center,
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T const& Radius,
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vec<2, T, Q> const& Focal,
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vec<2, T, Q> const& Position
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)
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{
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vec<2, T, Q> F = Focal - Center;
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vec<2, T, Q> 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, qualifier Q>
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GLM_FUNC_QUALIFIER T linearGradient
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(
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vec<2, T, Q> const& Point0,
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vec<2, T, Q> const& Point1,
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vec<2, T, Q> const& Position
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)
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{
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vec<2, T, Q> 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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