1 /////////////////////////////////////////////////////////////////////////////////////////////////// 2 // OpenGL Mathematics Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net) 3 /////////////////////////////////////////////////////////////////////////////////////////////////// 4 // Created : 2005-12-30 5 // Updated : 2008-09-29 6 // Licence : This source is under MIT License 7 // File : glm/gtx/vector_angle.inl 8 /////////////////////////////////////////////////////////////////////////////////////////////////// 9 10 namespace glm 11 { 12 template <typename genType> 13 GLM_FUNC_QUALIFIER genType angle 14 ( 15 genType const & x, 16 genType const & y 17 ) 18 { 19 GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'angle' only accept floating-point inputs"); 20 21 genType const Angle(acos(clamp(dot(x, y), genType(-1), genType(1)))); 22 23 #ifdef GLM_FORCE_RADIANS 24 return Angle; 25 #else 26 # pragma message("GLM: angle function returning degrees is deprecated. #define GLM_FORCE_RADIANS before including GLM headers to remove this message.") 27 return degrees(Angle); 28 #endif 29 } 30 31 template <typename T, precision P, template <typename, precision> class vecType> 32 GLM_FUNC_QUALIFIER T angle 33 ( 34 vecType<T, P> const & x, 35 vecType<T, P> const & y 36 ) 37 { 38 GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'angle' only accept floating-point inputs"); 39 40 T const Angle(acos(clamp(dot(x, y), T(-1), T(1)))); 41 42 #ifdef GLM_FORCE_RADIANS 43 return Angle; 44 #else 45 # pragma message("GLM: angle function returning degrees is deprecated. #define GLM_FORCE_RADIANS before including GLM headers to remove this message.") 46 return degrees(Angle); 47 #endif 48 } 49 50 //! \todo epsilon is hard coded to 0.01 51 template <typename T, precision P> 52 GLM_FUNC_QUALIFIER T orientedAngle 53 ( 54 detail::tvec2<T, P> const & x, 55 detail::tvec2<T, P> const & y 56 ) 57 { 58 GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'orientedAngle' only accept floating-point inputs"); 59 60 T const Dot = clamp(dot(x, y), T(-1), T(1)); 61 62 #ifdef GLM_FORCE_RADIANS 63 T const Angle(acos(Dot)); 64 #else 65 # pragma message("GLM: orientedAngle function returning degrees is deprecated. #define GLM_FORCE_RADIANS before including GLM headers to remove this message.") 66 T const Angle(degrees(acos(Dot))); 67 #endif 68 detail::tvec2<T, P> const TransformedVector(glm::rotate(x, Angle)); 69 if(all(epsilonEqual(y, TransformedVector, T(0.01)))) 70 return Angle; 71 else 72 return -Angle; 73 } 74 75 template <typename T, precision P> 76 GLM_FUNC_QUALIFIER T orientedAngle 77 ( 78 detail::tvec3<T, P> const & x, 79 detail::tvec3<T, P> const & y, 80 detail::tvec3<T, P> const & ref 81 ) 82 { 83 GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'orientedAngle' only accept floating-point inputs"); 84 85 T const Dot = clamp(dot(x, y), T(-1), T(1)); 86 87 #ifdef GLM_FORCE_RADIANS 88 T const Angle(acos(Dot)); 89 #else 90 # pragma message("GLM: orientedAngle function returning degrees is deprecated. #define GLM_FORCE_RADIANS before including GLM headers to remove this message.") 91 T const Angle(degrees(acos(Dot))); 92 #endif 93 94 if(dot(ref, cross(x, y)) < T(0)) 95 return -Angle; 96 else 97 return Angle; 98 } 99 }//namespace glm 100
