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25 #define _USE_MATH_DEFINES
29 #include "tvgCommon.h"
32 #define mathMin(x, y) (((x) < (y)) ? (x) : (y))
33 #define mathMax(x, y) (((x) > (y)) ? (x) : (y))
36 static inline bool mathZero(float a)
38 return (fabsf(a) < FLT_EPSILON) ? true : false;
42 static inline bool mathEqual(float a, float b)
44 return (fabsf(a - b) < FLT_EPSILON);
48 static inline bool mathRightAngle(const Matrix* m)
50 auto radian = fabsf(atan2f(m->e21, m->e11));
51 if (radian < FLT_EPSILON || mathEqual(radian, float(M_PI_2)) || mathEqual(radian, float(M_PI))) return true;
56 static inline bool mathIdentity(const Matrix* m)
58 if (!mathEqual(m->e11, 1.0f) || !mathZero(m->e12) || !mathZero(m->e13) ||
59 !mathZero(m->e21) || !mathEqual(m->e22, 1.0f) || !mathZero(m->e23) ||
60 !mathZero(m->e31) || !mathZero(m->e32) || !mathEqual(m->e33, 1.0f)) {
67 static inline bool mathInverse(const Matrix* m, Matrix* out)
69 auto det = m->e11 * (m->e22 * m->e33 - m->e32 * m->e23) -
70 m->e12 * (m->e21 * m->e33 - m->e23 * m->e31) +
71 m->e13 * (m->e21 * m->e32 - m->e22 * m->e31);
73 if (mathZero(det)) return false;
75 auto invDet = 1 / det;
77 out->e11 = (m->e22 * m->e33 - m->e32 * m->e23) * invDet;
78 out->e12 = (m->e13 * m->e32 - m->e12 * m->e33) * invDet;
79 out->e13 = (m->e12 * m->e23 - m->e13 * m->e22) * invDet;
80 out->e21 = (m->e23 * m->e31 - m->e21 * m->e33) * invDet;
81 out->e22 = (m->e11 * m->e33 - m->e13 * m->e31) * invDet;
82 out->e23 = (m->e21 * m->e13 - m->e11 * m->e23) * invDet;
83 out->e31 = (m->e21 * m->e32 - m->e31 * m->e22) * invDet;
84 out->e32 = (m->e31 * m->e12 - m->e11 * m->e32) * invDet;
85 out->e33 = (m->e11 * m->e22 - m->e21 * m->e12) * invDet;
91 static inline void mathIdentity(Matrix* m)
105 static inline void mathScale(Matrix* m, float scale)
112 static inline void mathTranslate(Matrix* m, float x, float y)
119 static inline void mathRotate(Matrix* m, float degree)
121 auto radian = degree / 180.0f * M_PI;
122 auto cosVal = cosf(radian);
123 auto sinVal = sinf(radian);
125 m->e12 = m->e11 * -sinVal;
127 m->e21 = m->e22 * sinVal;
132 static inline void mathMultiply(Point* pt, const Matrix* transform)
134 auto tx = pt->x * transform->e11 + pt->y * transform->e12 + transform->e13;
135 auto ty = pt->x * transform->e21 + pt->y * transform->e22 + transform->e23;
141 static inline Matrix mathMultiply(const Matrix* lhs, const Matrix* rhs)
145 m.e11 = lhs->e11 * rhs->e11 + lhs->e12 * rhs->e21 + lhs->e13 * rhs->e31;
146 m.e12 = lhs->e11 * rhs->e12 + lhs->e12 * rhs->e22 + lhs->e13 * rhs->e32;
147 m.e13 = lhs->e11 * rhs->e13 + lhs->e12 * rhs->e23 + lhs->e13 * rhs->e33;
149 m.e21 = lhs->e21 * rhs->e11 + lhs->e22 * rhs->e21 + lhs->e23 * rhs->e31;
150 m.e22 = lhs->e21 * rhs->e12 + lhs->e22 * rhs->e22 + lhs->e23 * rhs->e32;
151 m.e23 = lhs->e21 * rhs->e13 + lhs->e22 * rhs->e23 + lhs->e23 * rhs->e33;
153 m.e31 = lhs->e31 * rhs->e11 + lhs->e32 * rhs->e21 + lhs->e33 * rhs->e31;
154 m.e32 = lhs->e31 * rhs->e12 + lhs->e32 * rhs->e22 + lhs->e33 * rhs->e32;
155 m.e33 = lhs->e31 * rhs->e13 + lhs->e32 * rhs->e23 + lhs->e33 * rhs->e33;
161 #endif //_TVG_MATH_H_