offroad 0.5.7

2D offsetting for arc polylines/polygons.
Documentation 
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use togo::prelude::*;
use offroad::prelude::{OffsetCfg, offset_polyline_to_polyline};

fn main() {
    // Configuration for offsetting
    let mut cfg = OffsetCfg::default();
    let mut svg = SVG::new(300.0, 300.0, Some("/tmp/polyline.svg"));
    cfg.svg = Some(&mut svg);
    // Show original polyline in SVG output
    cfg.svg_orig = true;
    // Show final offset polylines in SVG output
    cfg.svg_final = true;

    let poly_orig = vec![
        pvertex(point(0.0, 0.0), 0.0),
        pvertex(point(100.0, 100.0), 0.5),
        pvertex(point(200.0, 0.0), 1.3),
    ];
    // Translate to fit in the SVG viewport
    let poly = polyline_translate(&poly_orig, point(40.0, 100.0));

    // Internal offsetting
    let poly = polyline_reverse(&poly);
    let offset_polylines = offset_polyline_to_polyline(&poly, 15.0, &mut cfg);

    println!("Input polyline has {} vertices", poly.len());
    println!("Output has {} polylines", offset_polylines.len());
    for (i, polyline) in offset_polylines.iter().enumerate() {
        println!("Polyline {}: {} vertices", i, polyline.len());
    }

    if let Some(svg) = cfg.svg.as_mut() {
        // Write svg to file
        svg.write_stroke_width(0.1);
    }
    assert!(offset_polylines.len() == 1);
}