Crate geo_types

Expand description

The geo-types library defines geometric types for the GeoRust ecosystem.

In most cases, you will only need to use this crate if you’re a crate author and want compatibility with other GeoRust crates. Otherwise, the geo crate re-exports these types and additionally provides geospatial algorithms.

Geometries

Point: A single point represented by one Coord
MultiPoint: A collection of Points
Line: A line segment represented by two Coords
LineString: A series of contiguous line segments represented by two or more Coords
MultiLineString: A collection of LineStrings
Polygon: A bounded area represented by one LineString exterior ring, and zero or more LineString interior rings
MultiPolygon: A collection of Polygons
Rect: An axis-aligned bounded rectangle represented by minimum and maximum Coords
Triangle: A bounded area represented by three Coord vertices
GeometryCollection: A collection of Geometrys
Geometry: An enumeration of all geometry types, excluding Coord

Coordinates and Numeric Types

Coord: A two-dimensional coordinate. All geometry types are composed of Coords, though Coord itself is not a Geometry type. See Point for a single coordinate geometry.

By default, coordinates are 64-bit floating point numbers, but this is generic, and you may specify any numeric type that implements CoordNum or CoordFloat. As well as f64, this includes common numeric types like f32, i32, i64, etc.

use geo_types::Point;

// Geometries are f64 by default
let point: Point = Point::new(1.0, 2.0);
assert_eq!(std::mem::size_of::<Point>(), 64 * 2 / 8);

// You can be explicit about the numeric type.
let f64_point: Point<f64> = Point::new(1.0, 2.0);
assert_eq!(std::mem::size_of::<Point<f64>>(), 64 * 2 / 8);

// Or specify some non-default numeric type
let f32_point: Point<f32> = Point::new(1.0, 2.0);
assert_eq!(std::mem::size_of::<Point<f32>>(), 32 * 2 / 8);

// Integer geometries are supported too, though not all
// algorithms will be implemented for all numeric types.
let i32_point: Point<i32> = Point::new(1, 2);
assert_eq!(std::mem::size_of::<Point<i32>>(), 32 * 2 / 8);

Semantics

The geospatial types provided here aim to adhere to the OpenGIS Simple feature access standards. Thus, the types here are inter-operable with other implementations of the standards: JTS, GEOS, etc.

Features

The following optional Cargo features are available:

approx: Allows geometry types to be checked for approximate equality with approx
arbitrary: Allows geometry types to be created from unstructured input with arbitrary
serde: Allows geometry types to be serialized and deserialized with Serde
use-rstar_0_8: Allows geometry types to be inserted into rstar R*-trees (rstar v0.8)
use-rstar_0_9: Allows geometry types to be inserted into rstar R*-trees (rstar v0.9)