Awesome
polyline
Fast Google Encoded Polyline encoding & decoding in Rust.
Example
use polyline;
use geo_types::line_string;
let coord = line_string![(x: -120.2, y: 38.5), (x: -120.95, y: 40.7), (x: -126.453, y: 43.252)];
let output = "_p~iF~ps|U_ulLnnqC_mqNvxq`@";
let result = polyline::encode_coordinates(coord, 5).unwrap();
assert_eq!(result, output)
A Note on Coordinate Order
This crate uses Coord and LineString types from the geo-types crate, which encodes coordinates in (x, y) / (lon, lat) order. The Polyline algorithm and its first-party documentation assumes the opposite coordinate order. It is thus advisable to pay careful attention to the order of the coordinates you use for encoding and decoding.
FFI
C-compatible FFI bindings for this crate are provided by the polyline-ffi crate.