Function nannou::geom::line::quad_corners

pub fn quad_corners<S>(a: Point2<S>, b: Point2<S>, half_thickness: S) -> Quad<S> where
    S: BaseFloat, 

Given two points and half the line thickness, return the four corners of the rectangle describing the line.

Given a line a -> b, the indices are laid out as follows:

1                                        2
 ----------------------------------------
 |a                                    b|
 ----------------------------------------
0                                        3

Examples

use nannou::prelude::*;
use nannou::geom::line;

fn main() {
    let half_thickness = 1.0;
    let a = pt2(0.0, 0.0);
    let b = pt2(2.0, 0.0);

    // ab
    let expected = [pt2(0.0, -1.0), pt2(0.0, 1.0), pt2(2.0, 1.0), pt2(2.0, -1.0)];
    assert_eq!(expected, line::quad_corners(a, b, half_thickness).0);

    // ba
    let expected = [pt2(2.0, 1.0), pt2(2.0, -1.0), pt2(0.0, -1.0), pt2(0.0, 1.0)];
    assert_eq!(expected, line::quad_corners(b, a, half_thickness).0);
}