offroad 0.0.1-alpha

2D offsetting for arc polylines.
Documentation 
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use std::fmt::Display;

use crate::point::Point;

#[derive(Debug, Copy, Clone, PartialEq)]
pub struct Segment {
    pub a: Point,
    pub b: Point,
}

impl Display for Segment {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "[{}, {}]", self.a, self.b)
    }
}

impl Segment {
    #[inline]
    pub fn new(a: Point, b: Point) -> Self {
        Segment { a, b }
    }
}

#[inline]
pub fn segment(p0: Point, p1: Point) -> Segment {
    Segment::new(p0, p1)
}

impl Segment {
    pub fn get_centered_form(&self) -> (Point, Point, f64) {
        let center = (self.a + self.b) * 0.5;
        let dir = self.b - self.a;
        let (dirn, norm) = dir.normalize();
        let extent = norm * 0.5;
        (center, dirn, extent)
    }
}

#[cfg(test)]
mod test_segment {
    use crate::point::point;

    use super::*;

    #[test]
    fn test_new() {
        let s0 = Segment::new(point(1.0, 2.0), point(3.0, 4.0));
        let s1 = segment(point(1.0, 2.0), point(3.0, 4.0));
        assert_eq!(s0, s1);
    }

    #[test]
    fn test_display() {
        let s0 = Segment::new(point(1.0, 2.0), point(3.0, 4.0));
        assert_eq!("[[1.00000000000000000000, 2.00000000000000000000], [3.00000000000000000000, 4.00000000000000000000]]", format!("{}", s0));
    }

    #[test]
    fn test_get_centered_form() {
        let s0 = Segment::new(point(1.0, 1.0), point(3.0, 3.0));
        let (center, dir, extent) = s0.get_centered_form();
        assert_eq!(center, point(2.0, 2.0));
        assert_eq!(dir, point(0.7071067811865475, 0.7071067811865475));
        assert_eq!(extent, 1.4142135623730951);
    }
}