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vec2: rotate vec2 by angle

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This commit is contained in:
Recep Aslantas
2019-08-30 22:00:20 +03:00
parent 8cb6fa792c
commit cb54a8b8c5
1 changed files with 60 additions and 0 deletions
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60
include/cglm/vec2.h
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@@ -13,6 +13,40 @@
GLM_VEC2_ZERO
Functions:
CGLM_INLINE void glm_vec2(float * __restrict v, vec2 dest)
CGLM_INLINE void glm_vec2_copy(vec2 a, vec2 dest)
CGLM_INLINE void glm_vec2_zero(vec2 v)
CGLM_INLINE void glm_vec2_one(vec2 v)
CGLM_INLINE float glm_vec2_dot(vec2 a, vec2 b)
CGLM_INLINE float glm_vec2_cross(vec2 a, vec2 b)
CGLM_INLINE float glm_vec2_norm2(vec2 v)
CGLM_INLINE float glm_vec2_norm(vec2 vec)
CGLM_INLINE void glm_vec2_add(vec2 a, vec2 b, vec2 dest)
CGLM_INLINE void glm_vec2_adds(vec2 v, float s, vec2 dest)
CGLM_INLINE void glm_vec2_sub(vec2 a, vec2 b, vec2 dest)
CGLM_INLINE void glm_vec2_subs(vec2 v, float s, vec2 dest)
CGLM_INLINE void glm_vec2_mul(vec2 a, vec2 b, vec2 d)
CGLM_INLINE void glm_vec2_scale(vec2 v, float s, vec2 dest)
CGLM_INLINE void glm_vec2_scale_as(vec2 v, float s, vec2 dest)
CGLM_INLINE void glm_vec2_div(vec2 a, vec2 b, vec2 dest)
CGLM_INLINE void glm_vec2_divs(vec2 v, float s, vec2 dest)
CGLM_INLINE void glm_vec2_addadd(vec2 a, vec2 b, vec2 dest)
CGLM_INLINE void glm_vec2_subadd(vec2 a, vec2 b, vec2 dest)
CGLM_INLINE void glm_vec2_muladd(vec2 a, vec2 b, vec2 dest)
CGLM_INLINE void glm_vec2_muladds(vec2 a, float s, vec2 dest)
CGLM_INLINE void glm_vec2_maxadd(vec2 a, vec2 b, vec2 dest)
CGLM_INLINE void glm_vec2_minadd(vec2 a, vec2 b, vec2 dest)
CGLM_INLINE void glm_vec2_negate_to(vec2 v, vec2 dest)
CGLM_INLINE void glm_vec2_negate(vec2 v)
CGLM_INLINE void glm_vec2_normalize(vec2 v)
CGLM_INLINE void glm_vec2_normalize_to(vec2 vec, vec2 dest)
CGLM_INLINE void glm_vec2_rotate(vec2 v, float angle, vec2 dest)
CGLM_INLINE float glm_vec2_distance2(vec2 a, vec2 b)
CGLM_INLINE float glm_vec2_distance(vec2 a, vec2 b)
CGLM_INLINE void glm_vec2_maxv(vec2 v1, vec2 v2, vec2 dest)
CGLM_INLINE void glm_vec2_minv(vec2 v1, vec2 v2, vec2 dest)
CGLM_INLINE void glm_vec2_clamp(vec2 v, float minVal, float maxVal)
CGLM_INLINE void glm_vec2_lerp(vec2 from, vec2 to, float t, vec2 dest)
*/
@@ -432,6 +466,32 @@ glm_vec2_normalize_to(vec2 vec, vec2 dest) {
glm_vec2_scale(vec, 1.0f / norm, dest);
}
/*!
* @brief rotate vec2 around origin by angle (CCW: counterclockwise)
*
* Formula:
* 𝑥2 = cos(a)𝑥1 − sin(a)𝑦1
* 𝑦2 = sin(a)𝑥1 + cos(a)𝑦1
*
* @param[in] v vector to rotate
* @param[in] angle angle by radians
* @param[out] dest destination vector
*/
CGLM_INLINE
void
glm_vec2_rotate(vec2 v, float angle, vec2 dest) {
float c, s, x1, y1;
c = cosf(angle);
s = sinf(angle);
x1 = v[0];
y1 = v[1];
dest[0] = c * x1 - s * y1;
dest[1] = s * x1 + c * y1;
}
/**
* @brief squared distance between two vectors
*