1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

use crate::math::Real;
use crate::shape::RoundCylinder;
use crate::transformation::utils;
use na::{self, Point3};

impl RoundCylinder {
    /// Outlines this round cylinder’s shape using polylines.
    pub fn to_outline(
        &self,
        nsubdiv: u32,
        border_nsubdiv: u32,
    ) -> (Vec<Point3<Real>>, Vec<[u32; 2]>) {
        let r = self.inner_shape.radius;
        let br = self.border_radius;
        let he = self.inner_shape.half_height;

        let mut out_vtx = vec![];
        let mut out_idx = vec![];

        // Compute the profile.
        let center_ab = Point3::new(-r, -he, 0.0);
        let center_cd = Point3::new(-r, he, 0.0);
        let a = Point3::new(-r, -he - br, 0.0);
        let b = Point3::new(-r - br, -he, 0.0);
        let c = Point3::new(-r - br, he, 0.0);
        let d = Point3::new(-r, he + br, 0.0);

        out_vtx.push(a);
        utils::push_arc(center_ab, a, b, border_nsubdiv, &mut out_vtx);
        out_vtx.push(b);
        out_vtx.push(c);
        utils::push_arc(center_cd, c, d, border_nsubdiv, &mut out_vtx);
        out_vtx.push(d);

        let circles = [
            0..1,
            border_nsubdiv..border_nsubdiv + 2,
            border_nsubdiv * 2 + 1..border_nsubdiv * 2 + 2,
        ];
        utils::apply_revolution(false, false, &circles, nsubdiv, &mut out_vtx, &mut out_idx);
        (out_vtx, out_idx)
    }
}