import * as mars3d from "mars3d"
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export let map // mars3d.Map三维地图对象
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let geoJsonLayer
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export const mapOptions = {
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scene: {
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center: { lat: 31.722018, lng: 117.251926, alt: 8378, heading: 0, pitch: -33 }
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}
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}
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export const eventTarget = new mars3d.BaseClass() // 事件对象，用于抛出事件到面板中
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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 = 2017 // 切换到蓝色底图
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addLayer()
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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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/**
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* 添加合肥市建筑物和体育设施点
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* @returns {void}
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*
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*/
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function addLayer() {
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const tiles3dLayer = new mars3d.layer.TilesetLayer({
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name: "合肥市建筑物",
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url: "//data.mars3d.cn/3dtiles/jzw-hefei/tileset.json",
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maximumScreenSpaceError: 1,
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maximumMemoryUsage: 1024,
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marsJzwStyle: true, // 打开建筑物特效（内置Shader代码）
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popup: [
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{ field: "objectid", name: "编号" },
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{ field: "name", name: "名称" },
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{ field: "height", name: "楼高", unit: "米" }
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],
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center: { lat: 31.841018, lng: 117.252932, alt: 1346, heading: 38, pitch: -26 },
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flyTo: true
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})
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map.addLayer(tiles3dLayer)
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geoJsonLayer = new mars3d.layer.GeoJsonLayer({
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name: "体育设施点",
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url: "//data.mars3d.cn/file/geojson/hfty-point.json",
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symbol: {
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type: "billboard",
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styleOptions: {
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image: "img/marker/mark1.png",
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scale: 0.7,
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verticalOrigin: Cesium.VerticalOrigin.BOTTOM
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}
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},
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popup: "all",
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flyTo: true
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})
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map.addLayer(geoJsonLayer)
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// 绑定事件
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geoJsonLayer.on(mars3d.EventType.load, function (event) {
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const geojsonLength = geoJsonLayer.length
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eventTarget.fire("geoJsonLayerLoad", { geojsonLength })
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console.log("数据加载完成", event)
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})
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}
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// 保存为Geojson文件
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export function toGeojson() {
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const geojson = geoJsonLayer.toGeoJSON()
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mars3d.Util.downloadFile("hfty-point-含高度值.json", JSON.stringify(geojson))
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}
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// 计算贴地高度示例代码，可以将获取到的高度更新到数据库内，后续不用重复计算。
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export function getDataSurfaceHeight() {
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if (geoJsonLayer.length === 0) {
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globalMsg("数据尚未加载成功！")
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return
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}
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showLoading()
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// 对图层内的数据做贴地运算,自动得到贴地高度
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geoJsonLayer.autoSurfaceHeight({
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endItem: function (index, len) {
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const resultData = {
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percent: index + 1,
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percentAll: len
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}
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eventTarget.fire("computedResult", { resultData })
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},
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callback: function () {
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hideLoading()
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}
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})
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}
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