148 lines
4.7 KiB
JavaScript
148 lines
4.7 KiB
JavaScript
// +----------------------------------------------------------------------
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// | CRMEB [ CRMEB赋能开发者，助力企业发展 ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2016~2026 https://www.crmeb.com All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed CRMEB并不是自由软件，未经许可不能去掉CRMEB相关版权
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// +----------------------------------------------------------------------
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// | Author: CRMEB Team <admin@crmeb.com>
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// +----------------------------------------------------------------------
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/**
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* 地理围栏工具类
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* 提供根据经纬度判断是否在多边形范围内的功能
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*/
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const geoUtil = {
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/**
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* 判断点是否在多边形内部（射线法）
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* @param {Object} point 待判断的点 {lng: 经度, lat: 纬度}
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* @param {Array} polygon 多边形顶点数组 [{lng: 经度1, lat: 纬度1}, {lng: 经度2, lat: 纬度2}, ...]
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* @returns {Boolean} 是否在多边形内部
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*/
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isPointInPolygon: function(point, polygon) {
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if (!point || !polygon || !Array.isArray(polygon) || polygon.length < 3) {
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return false;
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}
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let inside = false;
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const x = point.lng;
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const y = point.lat;
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// 射线法实现
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for (let i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
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const xi = polygon[i].lng;
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const yi = polygon[i].lat;
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const xj = polygon[j].lng;
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const yj = polygon[j].lat;
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// 判断点是否在多边形的边上
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if (this.isPointOnLine(point, {lng: xi, lat: yi}, {lng: xj, lat: yj})) {
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return true;
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}
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// 判断点是否与多边形边界相交
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const intersect = ((yi > y) !== (yj > y)) &&
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(x < (xj - xi) * (y - yi) / (yj - yi) + xi);
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if (intersect) {
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inside = !inside;
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}
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}
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return inside;
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},
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/**
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* 判断点是否在线段上
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* @param {Object} point 待判断的点
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* @param {Object} lineStart 线段起点
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* @param {Object} lineEnd 线段终点
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* @returns {Boolean} 是否在线段上
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*/
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isPointOnLine: function(point, lineStart, lineEnd) {
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// 计算点到线段的距离
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const distance = this.pointToLineDistance(point, lineStart, lineEnd);
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// 如果距离非常小（接近0），且点在线段的包围盒内，则认为点在线段上
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return distance < 0.000001 &&
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point.lng >= Math.min(lineStart.lng, lineEnd.lng) &&
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point.lng <= Math.max(lineStart.lng, lineEnd.lng) &&
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point.lat >= Math.min(lineStart.lat, lineEnd.lat) &&
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point.lat <= Math.max(lineStart.lat, lineEnd.lat);
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},
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/**
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* 计算点到线段的距离
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* @param {Object} point 点
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* @param {Object} lineStart 线段起点
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* @param {Object} lineEnd 线段终点
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* @returns {Number} 距离
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*/
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pointToLineDistance: function(point, lineStart, lineEnd) {
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const A = point.lng - lineStart.lng;
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const B = point.lat - lineStart.lat;
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const C = lineEnd.lng - lineStart.lng;
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const D = lineEnd.lat - lineStart.lat;
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const dot = A * C + B * D;
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const lenSq = C * C + D * D;
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let param = -1;
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if (lenSq !== 0) {
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param = dot / lenSq;
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}
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let xx, yy;
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if (param < 0) {
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xx = lineStart.lng;
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yy = lineStart.lat;
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} else if (param > 1) {
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xx = lineEnd.lng;
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yy = lineEnd.lat;
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} else {
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xx = lineStart.lng + param * C;
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yy = lineStart.lat + param * D;
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}
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const dx = point.lng - xx;
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const dy = point.lat - yy;
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// 这里返回的是欧几里得距离，在实际地理应用中可能需要转换为实际距离（如米）
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return Math.sqrt(dx * dx + dy * dy);
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},
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/**
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* 计算两个经纬度点之间的距离（Haversine公式）
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* @param {Object} point1 第一个点
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* @param {Object} point2 第二个点
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* @returns {Number} 两点之间的距离（单位：米）
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*/
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getDistance: function(point1, point2) {
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const R = 6371000; // 地球半径（米）
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const φ1 = this.toRadians(point1.lat);
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const φ2 = this.toRadians(point2.lat);
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const Δφ = this.toRadians(point2.lat - point1.lat);
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const Δλ = this.toRadians(point2.lng - point1.lng);
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const a = Math.sin(Δφ / 2) * Math.sin(Δφ / 2) +
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Math.cos(φ1) * Math.cos(φ2) *
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Math.sin(Δλ / 2) * Math.sin(Δλ / 2);
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const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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const distance = R * c; // 距离（米）
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return distance;
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},
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/**
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* 角度转弧度
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* @param {Number} degrees 角度
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* @returns {Number} 弧度
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*/
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toRadians: function(degrees) {
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return degrees * (Math.PI / 180);
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}
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};
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export default geoUtil; |