import * as mars3d from "mars3d"
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export let map // mars3d.Map三维地图对象
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// 需要覆盖config.json中地图属性参数（当前示例框架中自动处理合并）
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export const mapOptions = {
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scene: {
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center: { lat: 39.800803, lng: 116.34344, alt: 6521, heading: 0, pitch: -45 }
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}
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}
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/**
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* 初始化地图业务，生命周期钩子函数（必须）
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* 框架在地图初始化完成后自动调用该函数
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* @param {mars3d.Map} mapInstance 地图对象
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* @returns {void} 无
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*/
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export function onMounted(mapInstance) {
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map = mapInstance // 记录map
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map.basemap = "黑色底图"
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// 创建Graphic图层
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const graphicLayer = new mars3d.layer.GraphicLayer()
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map.addLayer(graphicLayer)
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addDemoGraphics(graphicLayer)
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}
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/**
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* 释放当前地图业务的生命周期函数
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* @returns {void} 无
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*/
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export function onUnmounted() {
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map = null
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}
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function addDemoGraphics(graphicLayer) {
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// 颜色
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const colors = ["#f7fcf5", "#e5f5e0", "#c7e9c0", "#a1d99b", "#74c476", "#41ab5d", "#238b45", "#006d2c", "#00441b"].reverse()
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mars3d.Util.fetchJson({ url: "//data.mars3d.cn/file/geojson/bj-bus.json" })
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.then(function (res) {
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const arr = mars3d.Util.geoJsonToGraphics(res) // 解析geojson
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arr.forEach((item, index) => {
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const i = index % colors.length
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const color = colors[i]
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const height = i * 80 + 50
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const primitive = new mars3d.graphic.PolylinePrimitive({
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positions: item.positions,
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style: {
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width: 3,
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color: color,
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opacity: 0.8,
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setHeight: height
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},
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attr: item.attr
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})
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graphicLayer.addGraphic(primitive)
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})
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})
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.catch(function (error) {
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console.log("获取单个卡车详情失败", error)
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})
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}
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