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A1phaN
50 lines
2.2 KiB
TypeScript
50 lines
2.2 KiB
TypeScript
import { describe, expect, it } from 'vitest'
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import { gcj02ToWgs84 } from '@trek/shared'
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import { getAmapUrlForPlace } from './placeAmap'
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describe('getAmapUrlForPlace', () => {
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it('writes the position as lng,lat in GCJ-02', () => {
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const url = getAmapUrlForPlace({ name: '天安门', lat: 39.90869, lng: 116.39124 })!
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const position = new URL(url).searchParams.get('position')!
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const [lng, lat] = position.split(',').map(Number)
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// Longitude first — the opposite of every other pair in TREK, and what
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// Amap's URI API specifies.
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expect(lng).toBeGreaterThan(100)
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expect(lat).toBeLessThan(90)
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// And in Amap's datum: converting back must land on the stored WGS-84 value.
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// Handing the WGS-84 pair over unconverted would drop the pin a few hundred
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// metres away, which in a city is the wrong block.
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const back = gcj02ToWgs84(lat, lng)
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expect(back.lat).toBeCloseTo(39.90869, 4)
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expect(back.lng).toBeCloseTo(116.39124, 4)
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expect(lat).not.toBeCloseTo(39.90869, 4)
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})
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it('carries the place name as the marker label', () => {
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const url = getAmapUrlForPlace({ name: '故宫博物院', lat: 39.9163, lng: 116.3972 })!
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expect(new URL(url).searchParams.get('name')).toBe('故宫博物院')
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})
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it('labels an unnamed place with its coordinates rather than returning nothing', () => {
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// Amap refuses a marker request with no name, so the alternative to this is
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// no link at all for a place added by right-clicking the map.
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const url = getAmapUrlForPlace({ name: '', lat: 39.9163, lng: 116.3972 })!
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const params = new URL(url).searchParams
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expect(params.get('name')).toBe(params.get('position'))
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})
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it('needs coordinates: a name alone has nothing to place', () => {
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expect(getAmapUrlForPlace({ name: '某地', lat: null, lng: null } as never)).toBeNull()
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expect(getAmapUrlForPlace(null)).toBeNull()
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})
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it('leaves a coordinate outside China unshifted', () => {
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// GCJ-02 does not apply there, and shifting it would move the pin off the
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// place for a trip that has nothing to do with China.
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const url = getAmapUrlForPlace({ name: 'Eiffel Tower', lat: 48.8584, lng: 2.2945 })!
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expect(new URL(url).searchParams.get('position')).toBe('2.294500,48.858400')
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})
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})
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