/*** @param {Object} startTime  Date格式的开始时间* @param {Object} endTime Date格式的结束时间* @param {Object} coordinates  [x1,y1,x2,y2,x3,y3.......]* @param {Object} entityCollection  实体收集器*/
async function interpolationLine(startTime,endTime,coordinates,entityCollection){try{var start = Cesium.JulianDate.fromDate(startTime);var stop = Cesium.JulianDate.fromDate(endTime);// 计算每个坐标点的时间间隔var timeIntervals = []; //按每分钟进行插值var totalDuration = Cesium.JulianDate.secondsDifference(stop, start)/60; //生成插值点var positions = await lerpPostions(coordinates,Math.ceil(totalDuration));var intervalDuration = totalDuration / (positions.length - 1);  var currentTime = start;  for (var i = 0; i < positions.length; i++) {  var nextTime = Cesium.JulianDate.addDays(currentTime, intervalDuration, new Cesium.JulianDate());  timeIntervals.push(new Cesium.TimeInterval({  start: currentTime,  stop: nextTime,  isStartIncluded: true,  isStopIncluded: i === positions.length - 2 // 最后一个间隔包括结束时间  }));  currentTime = nextTime;  }  let lineps = [];const postionsLength = positions.length;entityCollection.entities.add({  polyline: {  clampToGround: true,positions: new Cesium.CallbackProperty((time)=>{var halfHour = Cesium.JulianDate.secondsDifference(time, start)/60;var dateRate = (halfHour/totalDuration);return positions.slice(0, postionsLength*dateRate);}, false),  width: 20,  material: new Cesium.PolylineGlowMaterialProperty({glowPower: 0.1,color: Cesium.Color.YELLOW}), }  });}catch(error){console.log("interpolationLine occur Error:",error);}}/**
* 生成均匀随机点坐标
* @param {Array} positions [x1,y1,x2,y2,x3,y3.......]
* @param {Number} number 需要进行插值的数量
* @param {Number} number 生成的随机点数
* @returns 返回生成的随机点坐标集合
*/
async function lerpPostions(positions,number,flag=true){var timeNumber = [];//占总时间的比例集合var lineDiatance = 0;//线的总长度var tempDis = [];//距离	const pointPosition = [];const points = [];try{if (positions.length <= 3) return;if(!flag){return positions;}//计算线段总长度for (var i = 0; i < positions.length - 2; i+=2) {let startPoint = new Cesium.Cartesian3.fromDegrees(positions[i],positions[i+1]);let currentDistance = Cesium.Cartesian3.distance(startPoint,new Cesium.Cartesian3.fromDegrees(positions[i+2],positions[i+3]));lineDiatance += currentDistance;tempDis.push(lineDiatance);points.push(startPoint);}//最后一截线段var lastPoint = new Cesium.Cartesian3.fromDegrees(positions[positions.length - 2],positions[positions.length - 1]);let lastDistance = Cesium.Cartesian3.distance(points[points.length - 1],lastPoint);lineDiatance += lastDistance;tempDis.push(lineDiatance);points.push(lastPoint);//设置每一个到达坐标对应的时间节点for (let i = 0; i < points.length; i++) {var everyTime = tempDis[i] / lineDiatance;timeNumber.push(everyTime);}//使用线性插值(线性插值的性能最高,但也最不圆滑)var spline = new Cesium.LinearSpline({times: timeNumber,points: points});for (let i = 1; i <= number; i++) {var cartesian3 = spline.evaluate(i / number);pointPosition.push(cartesian3);// 绘制插值点//  var interPoint = viewer.entities.add({// position: cartesian3,// point: {//   color: Cesium.Color.YELLOW,//   pixelSize: 6,//   disableDepthTestDistance: Number.POSITIVE_INFINITY// }//  });}return pointPosition}catch(error){console.log("lerpPostions occur error:",error);}return positions;
}

调用代码如下

        //设定了模拟时间的边界var startTime = new Date("2022-08-21 11:12:13");var endTime = new Date("2022-08-23 05:11:13");var start = Cesium.JulianDate.fromDate(startTime);var stop = Cesium.JulianDate.fromDate(endTime);//确保查看器处于预期的时间viewer.clock.startTime = start.clone();viewer.clock.stopTime = stop.clone();viewer.clock.currentTime = start.clone();viewer.clock.clockRange = Cesium.ClockRange.CLAMPED; //循环结束时//时间变化来控制速度viewer.clock.multiplier = 360;//给时间线设置边界viewer.timeline.zoomTo(start, stop);//建立一个统一管理实体的收集器let entityCollection = new Cesium.CustomDataSource("flowEntityCollection");viewer.dataSources.add(entityCollection);interpolationLine(startTime,endTime,coordinates,entityCollection);