141 lines
4.2 KiB
JavaScript
141 lines
4.2 KiB
JavaScript
export const coordinateInputPattern = /^-?\d+(\.\d{0,6})?$/;
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const coordinateRanges = {
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longitude: {
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label: '经度',
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min: -180,
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max: 180,
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},
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latitude: {
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label: '纬度',
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min: -90,
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max: 90,
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},
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};
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/** WGS-84 → GCJ-02（高德）偏移算法常量 */
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const WGS84_TO_GCJ02_PI = Math.PI;
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const WGS84_TO_GCJ02_A = 6378245.0;
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const WGS84_TO_GCJ02_EE = 0.00669342162296594323;
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const isOutOfChina = (longitude, latitude) =>
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longitude < 72.004 || longitude > 137.8347 || latitude < 0.8293 || latitude > 55.8271;
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const transformLatitude = (longitude, latitude) => {
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let result =
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-100.0 +
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2.0 * longitude +
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3.0 * latitude +
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0.2 * latitude * latitude +
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0.1 * longitude * latitude +
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0.2 * Math.sqrt(Math.abs(longitude));
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result +=
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((20.0 * Math.sin(6.0 * longitude * WGS84_TO_GCJ02_PI) +
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20.0 * Math.sin(2.0 * longitude * WGS84_TO_GCJ02_PI)) *
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2.0) /
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3.0;
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result +=
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((20.0 * Math.sin(latitude * WGS84_TO_GCJ02_PI) +
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40.0 * Math.sin((latitude / 3.0) * WGS84_TO_GCJ02_PI)) *
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2.0) /
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3.0;
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result +=
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((160.0 * Math.sin((latitude / 12.0) * WGS84_TO_GCJ02_PI) +
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320 * Math.sin((latitude * WGS84_TO_GCJ02_PI) / 30.0)) *
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2.0) /
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3.0;
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return result;
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};
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const transformLongitude = (longitude, latitude) => {
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let result =
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300.0 +
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longitude +
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2.0 * latitude +
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0.1 * longitude * longitude +
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0.1 * longitude * latitude +
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0.1 * Math.sqrt(Math.abs(longitude));
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result +=
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((20.0 * Math.sin(6.0 * longitude * WGS84_TO_GCJ02_PI) +
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20.0 * Math.sin(2.0 * longitude * WGS84_TO_GCJ02_PI)) *
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2.0) /
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3.0;
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result +=
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((20.0 * Math.sin(longitude * WGS84_TO_GCJ02_PI) +
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40.0 * Math.sin((longitude / 3.0) * WGS84_TO_GCJ02_PI)) *
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2.0) /
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3.0;
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result +=
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((150.0 * Math.sin((longitude / 12.0) * WGS84_TO_GCJ02_PI) +
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300.0 * Math.sin((longitude / 30.0) * WGS84_TO_GCJ02_PI)) *
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2.0) /
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3.0;
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return result;
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};
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/**
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* WGS-84（GPS / LBS）转 GCJ-02（高德/国测局），供高德地图绘制使用。
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* 中国境外坐标不做偏移，原样返回。
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* @param {number} longitude
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* @param {number} latitude
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* @returns {[number, number]} [经度, 纬度]
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*/
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export const wgs84ToGcj02 = (longitude, latitude) => {
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const lng = Number(longitude);
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const lat = Number(latitude);
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if (!Number.isFinite(lng) || !Number.isFinite(lat) || isOutOfChina(lng, lat)) {
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return [lng, lat];
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}
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let dLat = transformLatitude(lng - 105.0, lat - 35.0);
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let dLng = transformLongitude(lng - 105.0, lat - 35.0);
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const radLat = (lat / 180.0) * WGS84_TO_GCJ02_PI;
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let magic = Math.sin(radLat);
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magic = 1 - WGS84_TO_GCJ02_EE * magic * magic;
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const sqrtMagic = Math.sqrt(magic);
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dLat =
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(dLat * 180.0) /
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(((WGS84_TO_GCJ02_A * (1 - WGS84_TO_GCJ02_EE)) / (magic * sqrtMagic)) * WGS84_TO_GCJ02_PI);
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dLng = (dLng * 180.0) / ((WGS84_TO_GCJ02_A / sqrtMagic) * Math.cos(radLat) * WGS84_TO_GCJ02_PI);
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return [lng + dLng, lat + dLat];
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};
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export const normalizeCoordinateInput = value => {
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const rawValue = String(value ?? '').replace(/[^\d.-]/g, '');
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const isNegative = rawValue.startsWith('-');
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const unsignedValue = rawValue.replace(/-/g, '');
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if (!unsignedValue) {
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return isNegative ? '-' : '';
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}
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const [integerPart, ...decimalParts] = unsignedValue.split('.');
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const sign = isNegative ? '-' : '';
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if (!decimalParts.length) {
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return `${sign}${integerPart}`;
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}
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return `${sign}${integerPart || '0'}.${decimalParts.join('').slice(0, 6)}`;
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};
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export const isCoordinateInput = value => {
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if (value === undefined || value === null || value === '') {
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return true;
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}
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return coordinateInputPattern.test(String(value));
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};
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export const getCoordinateValidationMessage = (value, type, required = false) => {
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const range = coordinateRanges[type];
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if (!range) {
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return '';
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}
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if (value === undefined || value === null || value === '') {
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return required ? `${range.label}不能为空` : '';
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}
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if (!isCoordinateInput(value)) {
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return `${range.label}最多保留6位小数`;
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}
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const numberValue = Number(value);
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if (numberValue < range.min || numberValue > range.max) {
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return `${range.label}范围为 ${range.min} 到 ${range.max}`;
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}
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return '';
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};
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