contour-rs

Computes isorings and contour polygons by applying marching squares to a rectangular array of numeric values.
Outputs ring coordinates or polygons contours as a Vec of GeoJSON Features.
Note : This is a port of d3-contour.

The API exposes: - a countour_rings function, which computes isorings coordinates for one threshold value (returns a Vec of rings coordinates). - a ContourBuilder struct, which computes isorings coordinates for a Vec of threshold values and transform them in MultiPolygons (returns a Vec of GeoJSON Features).

Example:

rust let c = ContourBuilder::new(10, 10, false); // x dim., y dim., smoothing let res = c.contours(&vec![ 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 1., 1., 1., 0., 0., 0., 0., 0., 0., 0., 1., 1., 1., 0., 0., 0., 0., 0., 0., 0., 1., 1., 1., 0., 0., 0., 0., 0., 0., 0., 1., 1., 1., 0., 0., 0., 0., 0., 0., 0., 1., 1., 1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0. ], &[0.5]); // values, thresholds Output: rust [Feature { bbox: None, geometry: Some(Geometry { bbox: None, value: MultiPolygon([[[ [6., 7.5], [6., 6.5], [6., 5.5], [6., 4.5], [6., 3.5], [5.5, 3.], [4.5, 3.], [3.5, 3.], [3., 3.5], [3., 4.5], [3., 5.5], [3., 6.5], [3., 7.5], [3.5, 8.], [4.5, 8.], [5.5, 8.], [6., 7.5]]]]), foreign_members: None }), id: None, properties: Some({"value": Number(0.5)}), foreign_members: None }]

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.