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: 31.752136, lng: 117.269021, alt: 3782, heading: 338, pitch: -23 }
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},
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terrain: { show: false }
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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 // 记录首次创建的map
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map.basemap = 2017 // 蓝色底图
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globalMsg("文件数据较大，正在加载数据，请稍等片刻……")
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showLoading()
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const colorHash = {
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10: "#FFEDA0",
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15: "#FED976",
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20: "#FEB24C",
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25: "#FD8D3C",
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30: "#FC4E2A",
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35: "#E31A1C",
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40: "#BD0026",
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450000: "#800026"
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}
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const geoJsonLayer = new mars3d.layer.GeoJsonLayer({
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name: "建筑物面",
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url: "//data.mars3d.cn/file/geojson/buildings-hf.json",
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symbol: {
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type: "polygonCombine", // 大数据面类型，效率高
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styleOptions: {
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color: "#0d3685",
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opacity: 1.0,
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outline: false
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},
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callback: function (attr, styleOpt) {
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const floor = Number(attr.floor || 1)
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const diffHeight = floor * 5
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for (const key in colorHash) {
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if (floor <= parseInt(key)) {
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return { height: 0, diffHeight: diffHeight, color: colorHash[key] }
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}
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}
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return { height: 0, diffHeight: diffHeight }
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}
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},
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popup: "all"
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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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console.log("数据加载完成", event)
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hideLoading() // 关闭
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})
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// 在layer上绑定监听事件
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geoJsonLayer.on(mars3d.EventType.click, function (event) {
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const pickedItem = event.graphic.attr
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console.log("单击了合并对象中的单个值为", pickedItem)
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})
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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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