vec2/
extract.rs

1use core::ops::Mul;
2
3use num_traits::real::Real;
4use num_traits::Zero;
5use vec3;
6
7use super::{dot, len, len_values};
8
9/// # Example
10/// ```
11/// let mut v = vec2::new_zero();
12/// vec2::position_mat32(&mut v, &[1_f32, 0_f32, 0_f32, 1_f32, 1_f32, 1_f32]);
13/// assert_eq!(v, vec2::new_one());
14/// ```
15#[inline]
16pub fn position_mat32<'out, T>(out: &'out mut [T; 2], m: &[T; 6]) -> &'out mut [T; 2]
17where
18    T: Clone + Zero,
19{
20    out[0] = m[4].clone();
21    out[1] = m[5].clone();
22    out
23}
24/// # Example
25/// ```
26/// let mut v = vec2::new_zero();
27/// vec2::position_mat4(&mut v,
28///     &[1_f32, 0_f32, 0_f32, 0_f32, 0_f32, 1_f32, 0_f32, 0_f32, 0_f32, 0_f32, 1_f32, 0_f32, 1_f32, 1_f32, 1_f32, 1_f32]
29/// );
30/// assert_eq!(v, vec2::new_one());
31/// ```
32#[inline]
33pub fn position_mat4<'out, T>(out: &'out mut [T; 2], m: &[T; 16]) -> &'out mut [T; 2]
34where
35    T: Clone,
36{
37    out[0] = m[12].clone();
38    out[1] = m[13].clone();
39    out
40}
41/// # Example
42/// ```
43/// let mut v = vec2::new_zero();
44/// vec2::scale_mat2(&mut v, &[1_f32, 0_f32, 0_f32, 1_f32]);
45/// assert_eq!(v, vec2::new_one());
46/// ```
47#[inline]
48pub fn scale_mat2<'out, T>(out: &'out mut [T; 2], m: &[T; 4]) -> &'out mut [T; 2]
49where
50    T: Real,
51    for<'a, 'b> &'a T: Mul<&'b T, Output = T>,
52{
53    out[0] = len_values(&m[0], &m[2]);
54    out[1] = len_values(&m[1], &m[3]);
55    out
56}
57/// # Example
58/// ```
59/// let mut v = vec2::new_zero();
60/// vec2::scale_mat32(&mut v, &[1_f32, 0_f32, 0_f32, 1_f32, 1_f32, 1_f32]);
61/// assert_eq!(v, vec2::new_one());
62/// ```
63#[inline]
64pub fn scale_mat32<'out, T>(out: &'out mut [T; 2], m: &[T; 6]) -> &'out mut [T; 2]
65where
66    T: Real,
67    for<'a, 'b> &'a T: Mul<&'b T, Output = T>,
68{
69    out[0] = len_values(&m[0], &m[2]);
70    out[1] = len_values(&m[1], &m[3]);
71    out
72}
73/// # Example
74/// ```
75/// let mut v = vec2::new_zero();
76/// vec2::scale_mat3(&mut v, &[1_f32, 0_f32, 0_f32, 0_f32, 1_f32, 0_f32, 0_f32, 0_f32, 1_f32]);
77/// assert_eq!(v, vec2::new_one());
78/// ```
79#[inline]
80pub fn scale_mat3<'out, T>(out: &'out mut [T; 2], m: &[T; 9]) -> &'out mut [T; 2]
81where
82    T: Real,
83    for<'a, 'b> &'a T: Mul<&'b T, Output = T>,
84{
85    out[0] = vec3::len_values(&m[0], &m[3], &m[6]);
86    out[1] = vec3::len_values(&m[1], &m[4], &m[7]);
87    out
88}
89/// # Example
90/// ```
91/// let mut v = vec2::new_zero();
92/// vec2::scale_mat4(&mut v,
93///     &[1_f32, 0_f32, 0_f32, 0_f32, 0_f32, 1_f32, 0_f32, 0_f32, 0_f32, 0_f32, 1_f32, 0_f32, 0_f32, 0_f32, 0_f32, 1_f32]
94/// );
95/// assert_eq!(v, vec2::new_one());
96/// ```
97#[inline]
98pub fn scale_mat4<'out, T>(out: &'out mut [T; 2], m: &[T; 16]) -> &'out mut [T; 2]
99where
100    T: Real,
101    for<'a, 'b> &'a T: Mul<&'b T, Output = T>,
102{
103    out[0] = vec3::len_values(&m[0], &m[4], &m[8]);
104    out[1] = vec3::len_values(&m[1], &m[5], &m[9]);
105    out
106}
107/// # Example
108/// ```
109/// use std::f32::consts::FRAC_PI_2;
110/// let mut v: [f32; 2] = vec2::new_zero();
111/// assert_eq!(vec2::angle(&[1_f32, 0_f32], &[0_f32, 1_f32]), FRAC_PI_2);
112/// ```
113#[inline]
114pub fn angle<T>(a: &[T; 2], b: &[T; 2]) -> T
115where
116    T: Real,
117    for<'a, 'b> &'a T: Mul<&'b T, Output = T>,
118{
119    (dot(a, b) / (len(a) * len(b))).acos()
120}
vec2/extract.rs

vec2/
extract.rs
