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: 30.563158, lng: 116.329235, alt: 16165, 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 // 记录首次创建的map
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map.on(mars3d.EventType.load, () => {
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LodGraphicLayer()
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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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function LodGraphicLayer() {
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const lodGraphicLayer = new mars3d.layer.LodGraphicLayer({
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IdField: "id", // 数据的唯一主键 字段名称
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minimumLevel: 11, // 限定层级，只加载该层级下的数据。[与效率相关的重要参数]
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debuggerTileInfo: true,
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// 根据LOD分块信息去请求对应的Tile瓦块内的数据
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queryGridData: (grid, callback) => {
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const extent = grid.extent
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mars3d.Util.fetchJson({
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url: "//server.mars3d.cn/server/pointRandom/",
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queryParameters: {
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xmin: extent.xmin,
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ymin: extent.ymin,
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xmax: extent.xmax,
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ymax: extent.ymax,
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count: 5
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}
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})
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.then(function (data) {
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callback(grid, data) // 执行回调，回传数据
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})
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.catch(function (error) {
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console.log("加载JSON出错", error)
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})
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},
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// 根据 attr属性 创建 矢量对象[必须返回Graphic对象]
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createGraphic(grid, attr) {
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const height = mars3d.PointUtil.getSurfaceHeight(map.scene, Cesium.Cartesian3.fromDegrees(attr.x, attr.y))
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const graphic = new mars3d.graphic.ModelPrimitive({
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position: [attr.x, attr.y, height],
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style: {
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url: "//data.mars3d.cn/gltf/mars/leida.glb",
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scale: 1,
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minimumPixelSize: 40
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}
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})
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lodGraphicLayer.addGraphic(graphic)
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return graphic
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}
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})
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map.addLayer(lodGraphicLayer)
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lodGraphicLayer.on(mars3d.EventType.click, (event) => {
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console.log("你单击了对象", event)
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})
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}
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