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 graphicLayer // 矢量图层对象
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let pointLayer
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export const mapOptions = {
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scene: {
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center: { lat: 31.871794, lng: 116.800468, alt: 57020, heading: 90, pitch: -51 },
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fxaa: true
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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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// 创建矢量数据图层
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graphicLayer = new mars3d.layer.GraphicLayer()
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map.addLayer(graphicLayer)
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// 点矢量数据图层
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pointLayer = new mars3d.layer.GraphicLayer()
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map.addLayer(pointLayer)
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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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// 绘制线
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export function drawLine() {
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if (pointLayer) {
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pointLayer.clear()
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}
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graphicLayer.clear()
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graphicLayer.startDraw({
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type: "polyline",
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style: {
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color: "#55ff33",
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width: 3,
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clampToGround: true
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},
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success: function () {
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// 绘制成功之后回调
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}
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})
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}
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// 绘制点
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export function drawPoint() {
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pointLayer.clear()
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pointLayer.startDraw({
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type: "point",
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style: {
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pixelSize: 10,
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color: "red"
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},
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success: function () {
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nearPoint()
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}
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})
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}
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// 最近点计算
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function nearPoint() {
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const lineLayer = graphicLayer.getGraphics()
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const point = pointLayer.getGraphics()
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if (lineLayer.length < 1 || point.length < 1) {
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return
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}
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const line = lineLayer[0].toGeoJSON()
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const pt = point[0].toGeoJSON()
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const snapped = turf.nearestPointOnLine(line, pt, { units: "miles" })
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const position = snapped.geometry.coordinates
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// 最近点（图标点）
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const primitive = new mars3d.graphic.BillboardPrimitive({
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position: position,
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style: {
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image: "img/marker/mark3.png",
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scale: 1,
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horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
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verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
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scaleByDistance: new Cesium.NearFarScalar(10000, 1.0, 500000, 0.1),
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clampToGround: false
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},
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popup: "最近点"
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})
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pointLayer.addGraphic(primitive)
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}
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// 清除数据
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export function clearLayer() {
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graphicLayer.clear()
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pointLayer.clear()
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}
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