mars3d利用turf计算最短路径

一：基本条件：

1、障碍面
2、起点
2、终点

二、具体代码实现

第一步：绘制障碍面 polygonZAM 为绘制成功后地图上的面矢量数据

export function drawPolygon() {
  if (polygonZAM) {
    polygonZAM.remove()
    polygonZAM = null
  }
  graphicLayer.startDraw({
    type: "polygon",
    style: {
      color: "#00ffff",
      opacity: 0.4,
      outline: true,
      outlineWidth: 1,
      outlineColor: "#ffffff"
    },
    success: (graphic) => {
      polygonZAM = graphic
    }
  })

第二步：在地图上绘制起点和终点 pointQD（起点矢量数据）、pointZD （终点矢量数据）

 graphicLayer.startDraw({
    type: "point",
    style: {
      pixelSize: 10,
      color: "red",
      label: {
        text: "起点",
        font_size: 20,
        color: "#ffffff",
        outline: true,
        outlineColor: "#000000",
        pixelOffsetY: -20
      }
    },
    success: (graphic) => {
      pointQD = graphic
    }
  })

//==================================================

 graphicLayer.startDraw({
    type: "point",
    style: {
      pixelSize: 10,
      color: "red",
      label: {
        text: "终点",
        font_size: 20,
        color: "#ffffff",
        outline: true,
        outlineColor: "#000000",
        pixelOffsetY: -20
      }
    },
    success: (graphic) => {
      pointZD = graphic
    }
  })

第三步：计算最短路径 polyonLine 为最短路径

const polygon = polygonZAM.toGeoJSON() // 障碍面
  const startPoint = pointQD.toGeoJSON() // 起点
  const endPoint = pointZD.toGeoJSON() // 终点

  const options = {
    obstacles: polygon
  }
  const path = turf.shortestPath(startPoint, endPoint, options)

  const positions = path.geometry.coordinates
  const polyonLine = new mars3d.graphic.PolylineEntity({
    positions: positions,
    style: {
      color: " #55ff33"
    }
  })
  shortestPathLayer.addGraphic(polyonLine)