37 lines
904 B
Text
37 lines
904 B
Text
|
/// @ref gtx_gradient_paint
|
||
|
|
|
||
|
|
namespace glm
|
||
|
|
{
|
||
|
|
template<typename T, qualifier Q>
|
||
|
|
GLM_FUNC_QUALIFIER T radialGradient
|
||
|
|
(
|
||
|
|
vec<2, T, Q> const& Center,
|
||
|
|
T const& Radius,
|
||
|
|
vec<2, T, Q> const& Focal,
|
||
|
|
vec<2, T, Q> const& Position
|
||
|
|
)
|
||
|
|
{
|
||
|
|
vec<2, T, Q> F = Focal - Center;
|
||
|
|
vec<2, T, Q> 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, qualifier Q>
|
||
|
|
GLM_FUNC_QUALIFIER T linearGradient
|
||
|
|
(
|
||
|
|
vec<2, T, Q> const& Point0,
|
||
|
|
vec<2, T, Q> const& Point1,
|
||
|
|
vec<2, T, Q> const& Position
|
||
|
|
)
|
||
|
|
{
|
||
|
|
vec<2, T, Q> Dist = Point1 - Point0;
|
||
|
|
return (Dist.x * (Position.x - Point0.x) + Dist.y * (Position.y - Point0.y)) / glm::dot(Dist, Dist);
|
||
|
|
}
|
||
|
|
}//namespace glm
|