maplibre-gl/src/geo/lng_lat.test.ts

BSD licensed community fork of mapbox-gl, a WebGL interactive maps library

import LngLat from '../geo/lng_lat';

describe('LngLat', () => {
    test('#constructor', () => {
        expect(new LngLat(0, 0) instanceof LngLat).toBeTruthy();

        expect(() => {
            /*eslint no-new: 0*/
            new LngLat(0, -91);
        }).toThrow('Invalid LngLat latitude value: must be between -90 and 90');

        expect(() => {
            /*eslint no-new: 0*/
            new LngLat(0, 91);
        }).toThrow('Invalid LngLat latitude value: must be between -90 and 90');
    });

    test('#convert', () => {
        expect(LngLat.convert([0, 10]) instanceof LngLat).toBeTruthy();
        expect(LngLat.convert({lng: 0, lat: 10}) instanceof LngLat).toBeTruthy();
        expect(LngLat.convert({lng: 0, lat: 0}) instanceof LngLat).toBeTruthy();
        expect(LngLat.convert({lon: 0, lat: 10}) instanceof LngLat).toBeTruthy();
        expect(LngLat.convert({lon: 0, lat: 0}) instanceof LngLat).toBeTruthy();
        expect(LngLat.convert(new LngLat(0, 0)) instanceof LngLat).toBeTruthy();
    });

    test('#wrap', () => {
        expect(new LngLat(0, 0).wrap()).toEqual({lng: 0, lat: 0});
        expect(new LngLat(10, 20).wrap()).toEqual({lng: 10, lat: 20});
        expect(new LngLat(360, 0).wrap()).toEqual({lng: 0, lat: 0});
        expect(new LngLat(190, 0).wrap()).toEqual({lng: -170, lat: 0});
    });

    test('#toArray', () => {
        expect(new LngLat(10, 20).toArray()).toEqual([10, 20]);
    });

    test('#toString', () => {
        expect(new LngLat(10, 20).toString()).toBe('LngLat(10, 20)');
    });

    test('#distanceTo', () => {
        const newYork = new LngLat(-74.0060, 40.7128);
        const losAngeles = new LngLat(-118.2437, 34.0522);
        const d = newYork.distanceTo(losAngeles); // 3935751.690893987, "true distance" is 3966km
        expect(d > 3935750).toBeTruthy();
        expect(d < 3935752).toBeTruthy();
    });

    test('#distanceTo to pole', () => {
        const newYork = new LngLat(-74.0060, 40.7128);
        const northPole = new LngLat(-135, 90);
        const d = newYork.distanceTo(northPole); // 5480494.158486183 , "true distance" is 5499km
        expect(d > 5480493).toBeTruthy();
        expect(d < 5480495).toBeTruthy();
    });

    test('#distanceTo to Null Island', () => {
        const newYork = new LngLat(-74.0060, 40.7128);
        const nullIsland = new LngLat(0, 0);
        const d = newYork.distanceTo(nullIsland); // 8667080.125666846 , "true distance" is 8661km
        expect(d > 8667079).toBeTruthy();
        expect(d < 8667081).toBeTruthy();
    });

    test('#toBounds', () => {
        expect(new LngLat(0, 0).toBounds(10).toArray()).toEqual(
            [[-0.00008983152770714982, -0.00008983152770714982], [0.00008983152770714982, 0.00008983152770714982]]
        );
        expect(new LngLat(-73.9749, 40.7736).toBounds(10).toArray()).toEqual(
            [[-73.97501862141328, 40.77351016847229], [-73.97478137858673, 40.77368983152771]]
        );
        expect(new LngLat(-73.9749, 40.7736).toBounds().toArray()).toEqual([[-73.9749, 40.7736], [-73.9749, 40.7736]]);
    });
});