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需求背景

需要实现一个动态的三维无人机航拍过程实景效果
代码开发中，迭代功能待续...

解决效果

index.vue

<template><div><el-button class="btn" @click="start">开始</el-button></div>
</template><script>
let lineEntity,lineDatasource = new Cesium.CustomDataSource("line-polygun"),wrjModelDatasource = new Cesium.CustomDataSource("wrj"),wrjEntity,wrjLineEntity,curPosition,lineArr =[]export default {data() {return {// 飞行区域边界线坐标coordinates: [[116.069898, 31.303655], [116.098708, 31.322126], [116.108063, 31.311256], [116.079317, 31.292959], [116.069898, 31.303655]],// 飞行路线points: [[116.069898, 31.303655, 200], [116.098708, 31.322126, 200], [116.108063, 31.311256, 200], [116.079317, 31.292959, 200]],// 当前飞行位置curRuningArr_i: 0,curRuningArr: [],}},mounted() {const viewer = window.dasViewer;viewer.scene.terrainProvider = new Cesium.EllipsoidTerrainProvider()viewer.dataSources.add(lineDatasource);viewer.dataSources.add(wrjModelDatasource);this.initwork()},destory() {lineDatasource.entities.removeAll()viewer.dataSources.remove(lineDatasource);wrjModelDatasource.entities.removeAll()viewer.dataSources.remove(wrjModelDatasource);},methods: {initwork() {const viewer = window.dasViewer;const pos = Cesium.Cartesian3.fromDegreesArray(this.coordinates.flat())const entity = lineDatasource.entities.add({polyline: {positions: pos,width: 1.5,material: Cesium.Color.fromCssColorString("#C0C0C0").withAlpha(0.5),// disableDepthTestDistance: Number.POSITIVE_INFINITY, //解决遮挡问题heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,}})viewer.flyTo(entity)this.addModel()},addModel() {const viewer = window.dasViewer;const positions = Cesium.Cartesian3.fromDegreesArrayHeights(this.points.flat())wrjEntity = wrjModelDatasource.entities.add({position: Cesium.Cartesian3.fromDegrees(116.069898, 31.303655, 200),model: {uri: process.env.VUE_APP_MODEL_API + '/wrj.glb',scale: 100,horizontalOrigin: Cesium.HorizontalOrigin.CENTER,verticalOrigin: Cesium.VerticalOrigin.CENTER,},})wrjLineEntity = wrjModelDatasource.entities.add({polyline: {positions: positions,width: 1.5,material: Cesium.Color.fromCssColorString("red").withAlpha(1),heightReference: Cesium.HeightReference.NONE,}})// viewer.scene.postRender.addEventListener(()=>{//   wrjLineEntity.polyline.positions = lineArr// });},start() {let runQueue = this.points.map((_, i) => ([this.points[i], this.points[i + 1]]))runQueue.pop()runQueue = runQueue.map(pos => ({pos,startCartesian3: Cesium.Cartesian3.fromDegrees(pos[0][0], pos[0][1], pos[0][2]), // 该路径起始点cartesian3Pos: pos.map(item => Cesium.Cartesian3.fromDegrees(item[0], item[1], item[2])) // 该路径起始点和目标点}))this.runRecursion(0, runQueue)},runRecursion(i, runArr, callback) {const self = thisconst speed = 700 // todo 默认速度为500m/sconst cartesian3Pos = runArr[i].cartesian3PoslineArr = runArr.slice(0, Math.max(1, i + 1)).map(item => item.startCartesian3).flat()self.curRuningArr_i = iself.curRuningArr = runArrself.runFn(cartesian3Pos, lineArr, speed, () => {if (++i < runArr.length) self.runRecursion(i, runArr, callback)})},runFn([startPosition, targetPosition], lineArr, speed, callback) { // [startPosition 初始点位 targetPosition 目标点位] lineArr 路径线点位 speed 速度const subtract = Cesium.Cartesian3.subtract(startPosition, targetPosition, new Cesium.Cartesian3());const meter = Cesium.Cartesian3.magnitude(subtract) // 得出距离多少米const step = meter / speedconst startTime = Cesium.JulianDate.now()curPosition = new Cesium.Cartesian3()wrjEntity.position = new Cesium.CallbackProperty(() => {const elapsedTime = Cesium.JulianDate.secondsDifference(Cesium.JulianDate.now(), startTime);const ratio = elapsedTime / step;if (ratio >= 1.0) {callback()return targetPosition.clone()} else {return Cesium.Cartesian3.lerp(startPosition, targetPosition, ratio, curPosition)}}, false);},}
}
</script><style lang="less" scoped>
.btn {position: fixed;top: 20px;left: 20px;
}
</style>