import * as mars3d from "mars3d"
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export let map // mars3d.Map三维地图对象
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export let graphicLayer // 矢量图层对象
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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: 31.839779, lng: 117.261174, alt: 5404, heading: 359, pitch: -54 }
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},
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terrain: {
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show: false
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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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// 创建Graphic图层
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graphicLayer = new mars3d.layer.GraphicLayer()
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map.addLayer(graphicLayer)
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// 在layer上绑定监听事件
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graphicLayer.on(mars3d.EventType.click, function (event) {
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const pickedItem = event.pickedObject?.data
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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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bindLayerPopup() // 在图层上绑定popup,对所有加到这个图层的矢量数据都生效
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// 加一些演示数据
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addDemoGraphic1()
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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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graphicLayer.remove()
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}
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function addDemoGraphic1() {
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mars3d.Util.fetchJson({
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url: "//data.mars3d.cn/file/geojson/buildings-hf.json"
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})
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.then((data) => {
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let arr = mars3d.Util.geoJsonToGraphics(data, {
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symbol: {
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callback: function (attr) {
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const diffHeight = (attr.floor || 1) * 5
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return {
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height: 0,
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diffHeight: diffHeight,
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color: Cesium.Color.fromRandom({ alpha: 0.4 }) // 随机色
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}
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}
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}
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})
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arr = arr.slice(0, 5000) // 控制数量，避免卡顿
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globalMsg("共加载" + arr.length + "个面")
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// 多个面对象的合并渲染。
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const primitive = new mars3d.graphic.PolygonCombine({
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instances: arr,
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// 公共样式
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style: {
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outline: true,
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outlineColor: "#ffffff"
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},
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// 高亮时的样式
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highlight: {
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type: mars3d.EventType.click,
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color: Cesium.Color.YELLOW.withAlpha(0.9)
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}
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})
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graphicLayer.addGraphic(primitive)
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})
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.catch(function (error) {
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console.log("服务出错", error)
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})
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}
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// 适用于其他Geometry类型的数据，可以完全自定义
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// function addDemoGraphic2(graphicLayer) {
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// //加一些演示数据
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// Cesium.Resource.fetchJson({
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// url: "//data.mars3d.cn/file/geojson/buildings-hf.json",
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// })
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// .then((data) => {
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// let arr = mars3d.Util.geoJsonToGraphics(data);
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// globalMsg("共加载" + arr.length + "个面");
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// //多个面对象的合并渲染。
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// const instances = [];
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// for (let i = 0; i < arr.length; i++) {
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// const item = arr[i];
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// let itemColor = Cesium.Color.fromRandom();
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// const instance = new Cesium.GeometryInstance({
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// //其他Geometry类型的数据，按Cesium语法修改下面的geometry
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// geometry: new Cesium.RectangleGeometry({
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// rectangle: Cesium.Rectangle.fromCartesianArray(mars3d.LngLatArray.toCartesians(item.positions)),
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// vertexFormat: Cesium.PerInstanceColorAppearance.VERTEX_FORMAT,
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// height: 0,
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// extrudedHeight: (item.attr.floor || 1) * 5,
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// }),
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// attributes: {
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// color: Cesium.ColorGeometryInstanceAttribute.fromColor(itemColor),
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// },
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// });
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// instance.attr = item.attr; //重要：绑定相关属性
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// instances.push(instance);
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// }
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// //多个对象的合并渲染。
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// let primitive = new mars3d.graphic.BaseCombine({
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// instances: instances,
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// });
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// graphicLayer.addGraphic(primitive);
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// })
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// .catch(function (error) {
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// globalAlert("服务出错", error);
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// });
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// }
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export function addDemoGraphic(count) {
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graphicLayer.clear()
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showLoading()
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const startTime = new Date().getTime()
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count = count * 10000
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const arrData = []
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for (let j = 0; j < count; ++j) {
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const position = randomPoint()
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const pt1 = mars3d.PointUtil.getPositionByDirectionAndLen(position, 45, 500)
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const pt2 = mars3d.PointUtil.getPositionByDirectionAndLen(position, 135, 500)
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const pt3 = mars3d.PointUtil.getPositionByDirectionAndLen(position, 225, 500)
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const pt4 = mars3d.PointUtil.getPositionByDirectionAndLen(position, 315, 500)
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arrData.push({
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positions: [pt1, pt2, pt3, pt4, pt1],
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style: {
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height: random(30, 9000),
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color: Cesium.Color.fromRandom(),
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opacity: 0.6
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},
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attr: {
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name: "第" + j + "个"
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}
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})
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}
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// 多个面对象的合并渲染。
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const primitive = new mars3d.graphic.PolygonCombine({
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instances: arrData,
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// 高亮时的样式
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highlight: {
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type: mars3d.EventType.click,
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color: Cesium.Color.YELLOW.withAlpha(0.9)
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}
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})
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graphicLayer.addGraphic(primitive)
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hideLoading()
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const endTime = new Date().getTime()
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// 两个时间戳相差的毫秒数
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const usedTime = (endTime - startTime) / 1000
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globalMsg("共耗时" + usedTime.toFixed(2) + "秒")
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}
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// 在图层绑定Popup弹窗
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export function bindLayerPopup() {
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graphicLayer.bindPopup(function (event) {
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const attr = event.graphic.attr || {}
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attr["类型"] = event.graphic.type
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attr["来源"] = "我是layer上绑定的Popup"
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attr["备注"] = "我支持鼠标交互"
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return mars3d.Util.getTemplateHtml({ title: "矢量图层", template: "all", attr: attr })
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})
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}
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// 取区域内的随机点
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function randomPoint() {
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const jd = random(115.955684 * 1000, 117.474003 * 1000) / 1000
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const wd = random(30.7576 * 1000, 32.008782 * 1000) / 1000
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return Cesium.Cartesian3.fromDegrees(jd, wd)
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}
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function random(min, max) {
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return Math.floor(Math.random() * (max - min + 1) + min)
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}
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