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 heatLayer
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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: 31.823087, lng: 117.236208, alt: 2383, heading: 3, pitch: -61 }
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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 = 2017 // 蓝色底图
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showHeatMap()
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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 showHeatMap() {
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// 随机数据的生成
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const heatMapData0 = getRandomPoints()
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const heatMapData1 = getRandomPoints()
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const resultHeatMapData = getRandomPoints()
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// 热力图 图层
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heatLayer = new mars3d.layer.HeatLayer({
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positions: heatMapData0,
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rectangle: rectangle,
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// 以下为热力图本身的样式参数，可参阅api：https://www.patrick-wied.at/static/heatmapjs/docs.html
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heatStyle: {
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radius: 40,
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blur: 0.85
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},
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// 以下为矩形矢量对象的样式参数
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style: {
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// arc: true, // 是否为曲面
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height: 200.0
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}
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})
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map.addLayer(heatLayer)
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// 为了演示动态更新
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let ratio = 0
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map.on(mars3d.EventType.preUpdate, (e) => {
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if (!isDynamic) {
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return
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}
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ratio += 0.003
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if (ratio > 1.0) {
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ratio = 0.0
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}
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const gridData = new Array(100 * 100)
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gridData.fill(0)
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lerpHeatMapData(heatMapData0, heatMapData1, ratio, resultHeatMapData)
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// 更新数据
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heatLayer.setPositions(resultHeatMapData, true)
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})
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}
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let isDynamic = true
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export function chkUnderground(enabled) {
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isDynamic = enabled
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}
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const rectangle = {
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xmin: 117.226189,
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xmax: 117.245831,
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ymin: 31.828858,
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ymax: 31.842967
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}
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const heatCount = 1000
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// 获取bbox矩形区域内的count个随机点
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function getRandomPoints() {
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const arr = []
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const arrPoint = turf.randomPoint(heatCount, { bbox: [rectangle.xmin, rectangle.ymin, rectangle.xmax, rectangle.ymax] }).features // 随机点
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for (let i = 0; i < arrPoint.length; i++) {
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const item = arrPoint[i].geometry.coordinates
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const val = Math.floor(Math.random() * 100) // 热力值
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arr.push({ lng: item[0], lat: item[1], value: val })
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}
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return arr
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}
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function lerpHeatMapData(startArr, endArr, ratio, result) {
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for (let i = 0; i < heatCount; i++) {
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const start = startArr[i]
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const end = endArr[i]
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result[i] = {
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lng: start.lng * (1 - ratio) + end.lng * ratio,
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lat: start.lat * (1 - ratio) + end.lat * ratio,
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value: start.value * (1 - ratio) + end.value * ratio
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}
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}
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}
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