需求

    获取出发点和目的地的距离、步行时间及路线规划

原理

1. 采用微信小程序的map组件进行路线展示
2. 腾讯地图的 微信小程序SDK 获取规划路线的坐标点

wxml

<view class="container">
    <map longitude="{{longitude}}" latitude="{{latitude}}" polyline='{{polyline}}' include-points='{{includePoints}}' markers='{{markers}}' scale="{{scale}}" show-location></map>
    <view class="tips">步行{{duration}}分钟（约{{distance}}米）</view>
    <view bindtap="chooseAddress">选择位置</view>
</view>

js

var QQMapWX = require('../../utils/qqmap-wx-jssdk.min.js');
var qqmapsdk;
Page({

  data: {
    longitude:'',
    latitude:'',
    newCurrentLo :'',
    newCurrentLa :'',
    polyline:[],    // 路线
    includePoints:[],    // 缩放视野以包含所有给定的坐标点
    scale:16,
    markers:null,
    duration:null,
    distance:''
  },

  
  onLoad: function (options) {
    qqmapsdk = new QQMapWX({
      key: 'UYFBZ-QFWHF-VVWJX-J7QP4-ZPPQ7-CZBJZ'
    });
    const _self=this;
    // 获取当前位置
    wx.getLocation({
      type:'gcj02',
      success: function(res) {
        const { longitude, latitude}=res
        _self.setData({
          longitude,
          latitude,
          markers: [{
            id: 1,
            longitude: longitude,
            latitude: latitude,
            width: 32,
            height: 32,
            iconPath:'../images/start.png'
          }],
          includePoints:[{
            longitude,
            latitude
          }]
        })
      },
    })
  },
  // 选择位置
  chooseAddress(){
    var _self=this;
    wx.chooseLocation({
      success: res=> {
        let markers=this.data.markers;
        if(markers.length>1){
          markers.pop()
        }
        
        markers.push({
          id: 2,
          longitude: res.longitude,
          latitude: res.latitude,
          width: 32,
          height: 32,
          iconPath:'../images/end.png'
        })
        var points = this.data.includePoints;
        if(points.length>1){
          points.pop()
        }
       
        points.push({
          longitude: res.longitude,
          latitude: res.latitude
        });
        this.setData({
          newCurrentLo:res.longitude,
          newCurrentLa:res.latitude,
          includePoints: points,
          markers: markers,
        })
        this.getPolyline()
      },
    })
  },
  // 规划路线
  getPolyline(){
    const { latitude, longitude, newCurrentLo, newCurrentLa}=this.data;
    // 调用腾讯地图接口
    qqmapsdk.direction({
      mode: 'walking',
      from: {
        latitude,
        longitude
      },
      to: {
        latitude: newCurrentLa,
        longitude: newCurrentLo
      },
      success: res => {
        var coors = res.result.routes[0].polyline, pl = [];
        // 坐标解压（返回的点串坐标，通过前向差分进行压缩）
        var kr = 1000000;
        for (var i = 2; i < coors.length; i++) {
          coors[i] = Number(coors[i - 2]) + Number(coors[i]) / kr;
        }
        // 将解压后的坐标放入点串数组pl中
        for (var i = 0; i < coors.length; i += 2) {
          pl.push({ latitude: coors[i], longitude: coors[i + 1] })
        }
        this.setData({
          longitude: pl[0].longitude,
          latitude: pl[0].latitude,
          polyline: [{
            points: pl,
            color: '#00ff00',
            width: 4
          }],
          duration: res.result.routes[0].duration,
          distance: res.result.routes[0].distance
        })
      }
    })
  }
})