offroad 0.0.1-alpha

2D offsetting for arc polylines.
Documentation 
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#![allow(dead_code)]

use crate::{
    dist_point_segment::dist_point_segment,
    int_segment_segment::{int_segment_segment, SegmentSegmentConfig},
    segment::Segment,
    utils::min_4,
};

const ZERO: f64 = 0.0;
const ONE: f64 = 1.0;
pub fn dist_segment_segment(seg0: &Segment, seg1: &Segment) -> f64 {
    let inter = int_segment_segment(seg0, seg1);
    match inter {
        SegmentSegmentConfig::NoIntersection() => {
            let a = dist_point_segment(&seg0.a, seg1).0;
            let b = dist_point_segment(&seg0.b, seg1).0;
            let c = dist_point_segment(&seg1.a, seg0).0;
            let d = dist_point_segment(&seg1.b, seg0).0;
            min_4(a, b, c, d)
        }
        _ => ZERO,
    }
}

#[cfg(test)]
mod test_distance_segment_segment {
    use crate::dist_segment_segment::{dist_segment_segment, ONE, ZERO};
    use crate::point::point;
    use crate::segment::segment;

    #[test]
    fn test_same_line_no_intersect() {
        let s0 = segment(point(0.0, 0.0), point(1.0, 0.0));
        let s1 = segment(point(2.0, 0.0), point(3.0, 0.0));
        assert_eq!(dist_segment_segment(&s0, &s1), ONE);
        assert_eq!(dist_segment_segment(&s1, &s0), ONE);
    }

    #[test]
    fn test_same_line_no_intersect_parallel() {
        let s0 = segment(point(0.0, 0.0), point(0.0, 2.0));
        let s1 = segment(point(1.0, 0.0), point(1.0, 2.0));
        assert_eq!(dist_segment_segment(&s0, &s1), ONE);
        assert_eq!(dist_segment_segment(&s1, &s0), ONE);
    }

    #[test]
    fn test_same_line_touching() {
        let s0 = segment(point(0.0, 0.0), point(1.0, 0.0));
        let s1 = segment(point(1.0, 0.0), point(2.0, 0.0));
        assert_eq!(dist_segment_segment(&s0, &s1), ZERO);
        assert_eq!(dist_segment_segment(&s1, &s0), ZERO);
    }

    #[test]
    fn test_same_line_overlaping_01() {
        let s0 = segment(point(0.0, 0.0), point(2.0, 0.0));
        let s1 = segment(point(1.0, 0.0), point(3.0, 0.0));
        assert_eq!(dist_segment_segment(&s0, &s1), ZERO);
        assert_eq!(dist_segment_segment(&s1, &s0), ZERO);
    }

    #[test]
    fn test_same_line_overlaping_02() {
        let s0 = segment(point(0.0, 0.0), point(2.0, 0.0));
        let s1 = segment(point(0.0, 0.0), point(2.0, 0.0));
        assert_eq!(dist_segment_segment(&s0, &s1), ZERO);
        assert_eq!(dist_segment_segment(&s1, &s0), ZERO);
    }

    #[test]
    fn test_parallel_segments_01() {
        let s0 = segment(point(0.0, 0.0), point(1.0, 0.0));
        let s1 = segment(point(2.0, 1.0), point(3.0, 1.0));
        assert_eq!(dist_segment_segment(&s0, &s1), f64::sqrt(2.0));
        assert_eq!(dist_segment_segment(&s1, &s0), f64::sqrt(2.0));
    }

    #[test]
    fn test_parallel_segments_02() {
        let s0 = segment(point(0.0, 0.0), point(1.0, 0.0));
        let s1 = segment(point(1.0, 1.0), point(2.0, 1.0));
        assert_eq!(dist_segment_segment(&s0, &s1), ONE);
        assert_eq!(dist_segment_segment(&s1, &s0), ONE);
    }

    #[test]
    fn test_parallel_segments_03() {
        let s0 = segment(point(0.0, 0.0), point(1.0, 0.0));
        let s1 = segment(point(0.0, 1.0), point(1.0, 1.0));
        assert_eq!(dist_segment_segment(&s0, &s1), ONE);
        assert_eq!(dist_segment_segment(&s1, &s0), ONE);
    }

    #[test]
    fn test_non_parallel_segments_04() {
        let s0 = segment(point(0.0, 0.0), point(2.0, 0.0));
        let s1 = segment(point(1.0, 0.5), point(2.0, 1.0));
        assert_eq!(dist_segment_segment(&s0, &s1), 0.5);
        assert_eq!(dist_segment_segment(&s1, &s0), 0.5);
    }

    #[test]
    fn test_non_parallel_segments_05() {
        let s0 = segment(point(0.0, 0.0), point(3.0, 0.0));
        let s1 = segment(point(1.0, 1.0), point(2.0, 1.0));
        assert_eq!(dist_segment_segment(&s0, &s1), 1.0);
        assert_eq!(dist_segment_segment(&s1, &s0), 1.0);
    }

    #[test]
    fn test_intersecting_segments() {
        let s0 = segment(point(0.0, 0.0), point(2.0, 0.0));
        let s1 = segment(point(0.0, -1.0), point(2.0, 1.0));
        assert_eq!(dist_segment_segment(&s0, &s1), ZERO);
        assert_eq!(dist_segment_segment(&s1, &s0), ZERO);
    }

    #[test]
    fn test_touching_segments() {
        let s0 = segment(point(0.0, 0.0), point(2.0, 0.0));
        let s1 = segment(point(1.0, 0.0), point(2.0, 1.0));
        assert_eq!(dist_segment_segment(&s0, &s1), ZERO);
        assert_eq!(dist_segment_segment(&s1, &s0), ZERO);
    }
}