geos
Rust bindings for GEOS C API.
The supported geos version is >= 3.5
Disclaimer
GEOS can be a tad strict on the validity on the input geometry and is prone to crash on invalid input, so they need to be checked in the wrapper. This project is checked with valgrind, but if you stumble on a crash feel free to open an issue explaining the problem.
Usage example
You can check the examples in the examples/ directory.
Constructing geometries from WKT:
extern crate geos;
let gg1 = geos::Geometry::new_from_wkt("POLYGON ((0 0, 0 5, 6 6, 6 0, 0 0))").expect("invalid WKT");
let gg2 = geos::Geometry::new_from_wkt("POLYGON ((1 1, 1 3, 5 5, 5 1, 1 1))").expect("invalid WKT");
let gg3 = gg1.difference(&gg2).expect("difference failed");
assert_eq!(
gg3.to_wkt_precision(0).expect("to_wkt failed"),
"POLYGON ((0 0, 0 5, 6 6, 6 0, 0 0), (1 1, 5 1, 5 5, 1 3, 1 1))",
);
"Preparing" the geometries for faster predicates (intersects, contains, etc.) computation on repetitive calls:
extern crate geos;
let g1 = geos::Geometry::new_from_wkt("POLYGON ((0 0, 0 5, 5 5, 5 0, 0 0))").expect("invalid WKT");
let g2 = geos::Geometry::new_from_wkt("POLYGON ((1 1, 1 3, 5 5, 5 0, 1 1))").expect("invalid WKT");
let pg1 = geos::PreparedGeometry::new(&g1).expect("PreparedGeometry::new failed");
let result = pg1.intersects(&g2).expect("intersects failed");
assert_eq!(result, true);
Conversion from geo
geo's objects can be converted into GEOS to use all geos algorithms.
Complete example can be found in examples/from_geo.rs
extern crate geos;
extern crate geo_types;
use geos::from_geo::TryInto;
use geo_types::{LineString, Coordinate, Polygon};
// first we create a Geo object
let exterior = LineString(vec![
Coordinate::from((0., 0.)),
Coordinate::from((0., 1.)),
Coordinate::from((1., 1.)),
]);
let interiors = vec![
LineString(vec![
Coordinate::from((0.1, 0.1)),
Coordinate::from((0.1, 0.9)),
Coordinate::from((0.9, 0.9)),
]),
];
let p = Polygon::new(exterior, interiors);
// and we can create a Geos geometry from this object
let geom: geos::Geometry = (&p).try_into().expect("failed conversion");
// do some stuff with geom
Voronoi
Voronoi diagrams computation are available in the bindings.
For those to be easier to use with geo some helpers are available in voronoi.rs.
extern crate geo_types;
use geo_types::Point;
let points = vec![
Point::new(0., 0.),
Point::new(0., 1.),
Point::new(1., 1.),
Point::new(1., 0.),
];
let voronoi = geos::compute_voronoi(&points, None, 0., false).expect("compute_voronoi failed");
Contributing
Only a subset of geos has been implemented, feel free to add wrappers for missing features.
All added features needs to be tested and this being a C wrapper, valgrind runs on all examples/tests to check that no bugs / memory leaks are lurking.
96 Dec 21, 2022
25 Aug 20, 2022
91 Dec 29, 2022
195 Dec 21, 2022
70 Nov 28, 2022
123 Dec 20, 2022
41 Dec 26, 2022