19 lines
377 B
Rust
19 lines
377 B
Rust
use cgmath::Vector2;
|
|
|
|
pub fn get_angle(p: &Vector2<f32>) -> f32 {
|
|
let pi=3.1415926;
|
|
let pi2 = 2.0*pi;
|
|
|
|
if p.x < 0.0 {
|
|
(p.y / p.x).atan() / pi2 + 0.75
|
|
} else if p.x == 0.0 && p.y == 0.0 {
|
|
0.0
|
|
} else {
|
|
if p.y < 0.0 {
|
|
(-p.x / p.y).atan() / pi2
|
|
} else {
|
|
(p.y / p.x).atan() / pi2 + 0.25
|
|
}
|
|
}
|
|
}
|
|
|