百度地图绘制途径点/分段绘制路线

百度地图绘制途径点

百度地图Api地址:
https://lbsyun.baidu.com/

公司项目中要求绘制物流信息,需体现途径点
但是我在其中没有找到有关绘制路线,设定途径点的相关说明

其实就是下面这句,给 search方法的第三个参数传一个waypoints对象:
其中middlePoints为标点的数组

      //途经点方式化路线:
       driving.search(startPoint, endPoint, { waypoints: middlePoints })

但是这个方法并不精准,由于没找到相关官方说明,也没深入考究,效果如下:

计算路线并未完全经过途径点

于是我们换一种思路

分段绘制路线

多次执行 driving.search(startPoint, endPoint)

      for (let i = 0; i < middlePoints.length; i++) {
        if (i === 0) {
          driving.search(startPoint, middlePoints[i])
        } else {
          driving.search(middlePoints[i - 1], middlePoints[i])
        }
      }
      driving.search(middlePoints[middlePoints.length - 1], endPoint)

但是这时就需要运用到更底层一点的函数
链接: 百度地图jsapi 类参考

在路线的构造函数里面,绘制途径点的每一段路线,并修改样式等等

最终详细代码如下:

		//点的坐标值
	    var gps = [
          {lng: 125.532203,lat: 43.715047},
          {lng: 123.545295,lat: 42.009887},
          {lng: 116.186376,lat: 39.974898},
          {lng: 114.539818,lat: 38.040826},
          {lng: 113.675145,lat: 34.815406},
          {lng: 112.95765,lat: 28.234227,},
          {lng: 109.940493,lat: 27.62963,},
          {lng: 106.684172,lat: 26.5924,},
          {lng: 102.74715,lat: 24.926418,}
      ]
      
      // 实例化地图
      var map = new BMapGL.Map('container')//注意这里的container为元素id,且不能修改
      map.centerAndZoom(new BMapGL.Point(116.404, 39.915), 11)
      map.enableScrollWheelZoom(true)//地图和滚轮放大

      //建立初始点,结束点,途经点数组
      var middlePoints = []
      var startPoint = new BMapGL.Point(gps[0].lng, gps[0].lat)
      var endPoint = new BMapGL.Point(
        gps[gps.length - 1].lng,
        gps[gps.length - 1].lat
      )
      for (let i = 0; i < gps.length; i++) {
        if (i === 0 || i === gps.length - 1) {
          continue
        }
        var point = new BMapGL.Point(gps[i].lng, gps[i].lat)
        middlePoints.push(point)
      }

      //调整到最佳视野
      setTimeout(function () {
        map.setViewport([startPoint, endPoint])
      }, 1000)

      //创建百度地图驾车实例
      var driving = new BMapGL.DrivingRoute(map, {
        renderOptions: { map: map, autoViewport: false },
        onSearchComplete(results) {
          // 绘制途径路线
          var pts = results.getPlan(0).getRoute(0).getPath()
          var polyline = new BMapGL.Polyline(pts)
          polyline.setStrokeColor('#001E50')
          polyline.setStrokeOpacity(1)
          map.addOverlay(polyline)
        },
        onMarkersSet(routes) {
          // 删点画点
          map.removeOverlay(routes[0].marker)
          map.removeOverlay(routes[routes.length - 1].marker)
          middlePoints.forEach((element) => {
            var marker = new BMapGL.Marker(element)
            map.addOverlay(marker)
          })
          var startMarker = new BMapGL.Marker(startPoint)
          var endMarker = new BMapGL.Marker(endPoint)
          map.addOverlay(startMarker)
          map.addOverlay(endMarker)
        },
        onPolylinesSet(routes) {
          // 路线绘制
          routes.forEach((Route) => {
            var polyline = Route.getPolyline()
            polyline.setStrokeColor('#001E50')
            // polyline.setStrokeOpacity(1)
            polyline.setStrokeWeight(1)
          })
        },
      })

      //途经点方式化路线:
      // driving.search(startPoint, endPoint, { waypoints: middlePoints })

      //分段画路线:
      for (let i = 0; i < middlePoints.length; i++) {
        if (i === 0) {
          driving.search(startPoint, middlePoints[i])
        } else {
          driving.search(middlePoints[i - 1], middlePoints[i])
        }
      }
      driving.search(middlePoints[middlePoints.length - 1], endPoint)
      

建议根据需求研究一下api, 继续优化样式等

最终效果:

欢迎交流提问 ~

标签：map,分段,middlePoints,lat,var,lng,绘制,百度,gps
来源： https://blog.csdn.net/weixin_53296753/article/details/122054689