mappers 0.8.1

Pure Rust geographical projections library
Documentation 
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mod special_cases;

use float_cmp::assert_approx_eq;
use mappers::{
    Ellipsoid, Projection,
    projections::{AzimuthalEquidistant, LambertConformalConic},
};
use proj::Proj;

#[allow(unused)]
pub enum TestExtent {
    Global,
    Local,
}

static ELLIPSOIDS_TEST_SET: [(Ellipsoid, &str); 6] = [
    (Ellipsoid::WGS84, "WGS84"),
    (Ellipsoid::WGS72, "WGS72"),
    (Ellipsoid::WGS66, "WGS66"),
    (Ellipsoid::WGS60, "WGS60"),
    (Ellipsoid::GRS80, "GRS80"),
    (Ellipsoid::SPHERE, "sphere"),
];

static GLOBAL_GEO_POINTS: [(f64, f64); 8] = [
    (45.0, 45.0),
    (-45.0, 45.0),
    (45.0, -45.0),
    (-45.0, -45.0),
    (135.0, 45.0),
    (-135.0, 45.0),
    (135.0, -45.0),
    (-135.0, -45.0),
];

static LOCAL_GEO_POINTS: [(f64, f64); 8] = [
    (31.48, 31.26),
    (28.51, 31.26),
    (31.44, 28.72),
    (28.55, 28.72),
    (33.00, 32.50),
    (26.99, 32.50),
    (27.14, 27.42),
    (32.85, 27.42),
];

static MAP_POINTS: [(f64, f64); 8] = [
    (100_000.0, 100_000.0),
    (-100_000.0, 100_000.0),
    (100_000.0, -100_000.0),
    (-100_000.0, -100_000.0),
    (200_000.0, 200_000.0),
    (-200_000.0, 200_000.0),
    (200_000.0, -200_000.0),
    (-200_000.0, -200_000.0),
];

macro_rules! basic_correctness_test {
    ($builder:ident,$projstr:expr) => {
        for (ellps, ellps_name) in ELLIPSOIDS_TEST_SET {
            let int_proj = $builder.ellipsoid(ellps).initialize_projection().unwrap();

            test_points_with_proj(
                &int_proj,
                &format!("{} +ellps={}", $projstr, ellps_name),
                TestExtent::Global,
            );

            test_points_with_proj(
                &int_proj,
                &format!("{} +ellps={}", $projstr, ellps_name),
                TestExtent::Local,
            );
        }
    };
}

#[test]
fn azimuthal_equidistant() {
    let mut partial_builder = AzimuthalEquidistant::builder();
    partial_builder.ref_lonlat(29.0, 31.0);
    let partial_proj = "+proj=aeqd +lon_0=29.0 +lat_0=31.0";

    basic_correctness_test!(partial_builder, partial_proj);
}

#[test]
fn lambert_conformal_conic() {
    let mut partial_builder = LambertConformalConic::builder();
    partial_builder
        .standard_parallels(30.0, 60.0)
        .ref_lonlat(29.0, 31.0);
    let partial_proj = "+proj=lcc +lat_1=30.0 +lat_2=60.0 +lon_0=29.0 +lat_0=31.0";

    basic_correctness_test!(partial_builder, partial_proj);
}

#[test]
fn lcc_single_par() {
    let mut partial_builder = LambertConformalConic::builder();
    partial_builder.single_parallel(40.0).ref_lonlat(29.0, 31.0);
    let partial_proj = "+proj=lcc +lat_1=40.0 +lat_2=40.0 +lon_0=29.0 +lat_0=31.0";

    basic_correctness_test!(partial_builder, partial_proj);
}

#[test]
fn modified_azimuthal_equidistant() {
    special_cases::modified_azimuthal_equidistant::basic_correctness();
}

#[test]
fn equidistant_cylindrical() {
    special_cases::equidistant_cylindrical::basic_correctness();
}

#[test]
fn oblique_lon_lat() {
    special_cases::oblique_lon_lat::basic_correctness();
}

pub fn test_points_with_proj<P: Projection>(int_proj: &P, proj_str: &str, extent: TestExtent) {
    let ref_proj = Proj::new(proj_str).unwrap();

    let geo_points = match extent {
        TestExtent::Global => GLOBAL_GEO_POINTS,
        TestExtent::Local => LOCAL_GEO_POINTS,
    };

    for point in geo_points {
        let (ref_x, ref_y) = ref_proj
            .project((point.0.to_radians(), point.1.to_radians()), false)
            .unwrap();

        let (tst_x, tst_y) = int_proj.project(point.0, point.1).unwrap();

        assert_approx_eq!(f64, ref_x, tst_x, epsilon = 0.000_000_1);
        assert_approx_eq!(f64, ref_y, tst_y, epsilon = 0.000_000_1);
    }

    for point in MAP_POINTS {
        let (ref_lon, ref_lat) = ref_proj.project(point, true).unwrap();

        let (tst_lon, tst_lat) = int_proj.inverse_project(point.0, point.1).unwrap();

        assert_approx_eq!(f64, ref_lon.to_degrees(), tst_lon, epsilon = 0.000_000_1);
        assert_approx_eq!(f64, ref_lat.to_degrees(), tst_lat, epsilon = 0.000_000_1);
    }
}