cesium 卫星环绕扫描

成果图

源码

            let viewer = new Cesium.Viewer('cesiumContainer',{
                // terrainProvider: Cesium.createWorldTerrain(),
                geocoder: false, // 隐藏查找位置
                homeButton: false, // 隐藏返回视角到初始位置
                sceneModePicker: false, // 隐藏视角模式的选择
                baseLayerPicker: false, // 隐藏图层选择器
                navigationHelpButton: false, // 隐藏帮助
                timeline: true, // 隐藏时间轴
                fullscreenButton: false, // 隐藏全屏按钮
                animation: true, // 隐藏动画速度控制器
                infoBox: false, // If set to false, the InfoBox widget will not be created.点击的详情弹窗entity的description可以描述html显示在弹窗中,也可以通过viewer.infoBox.frame来接入访问
            });
            //去掉版权信息
            viewer._cesiumWidget._creditContainer.style.display = "none"
 var start = new Cesium.JulianDate.fromDate(new Date());//把js中的时间转换为儒略时间
            start = Cesium.JulianDate.addHours(start, 8, new Cesium.JulianDate());//东八区时间
            // 结束时间
            var stop = Cesium.JulianDate.addSeconds(start, 360, new Cesium.JulianDate());
            
            //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.LOOP_STOP; //循环结束时
            //时间变化来控制速度 // 时间速率，数字越大时间过的越快
            viewer.clock.multiplier = 10;
            //给时间线设置边界
            viewer.timeline.zoomTo(start, stop);

            function mySatePosition (){
                this.lon = 0;
                this.lat = 0;
                this.satelliteHeight = 700000;          //卫星高度
                this.orbitHeight = 700000 / 2;     //轨道高度
                this.time = 0;
            }
            
            function getRandState(ifLat, degree) {
                    var arr = [];
                    var lat = Math.floor(Math.random() * 360);
                    for (var i = lat; i <= 360 + lat; i += 30) {
                        var aaa = new mySatePosition();
                        if(ifLat=='lon'){
                            aaa.lon = degree;
                            aaa.lat = i;
                        }else{
                            aaa.lon = i
                            aaa.lat = degree;
                        }
                        aaa.time = i - lat;
                        arr.push(aaa);
                    }
                return arr
            }
          
            function computePosition(source,panduan) {
                var property = new Cesium.SampledPositionProperty();
                for (var i = 0; i < source.length; i++) {
                    var time = Cesium.JulianDate.addSeconds(start, source[i].time, new Cesium.JulianDate());
                    var position = Cesium.Cartesian3.fromDegrees(source[i].lon, source[i].lat, panduan === 1 ? source[i].satelliteHeight : source[i].orbitHeight);
                    property.addSample(time, position);
                }
                return property;
            }
            function startSimulation(ifLat, degree) {
                //获取路径
                let path = getRandState(ifLat,degree);
                //扫描圆锥
                var entityPath = computePosition(path, 2);
                var entity = viewer.entities.add({
                    //关联时间轴  TimeIntervalCollection管理时间间隔数据的集合  把时间轴的起止时间同步为实体的
                    availability: new Cesium.TimeIntervalCollection([new Cesium.TimeInterval({
                        start: start,
                        stop: stop
                    })]),
                    position: entityPath,
                    orientation: new Cesium.VelocityOrientationProperty(entityPath),
                    cylinder: {
                        HeightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
                        length: 700000,
                        topRadius: 0,
                        bottomRadius: 700000 / 2,
                        material: Cesium.Color.RED.withAlpha(0.4),
                        outline: true,
                        numberOfVerticalLines: 0,
                        outlineColor: Cesium.Color.RED.withAlpha(0.8)
                    },
                });
                entity.position.setInterpolationOptions({
                    interpolationDegree: 5,
                    interpolationAlgorithm: Cesium.LagrangePolynomialApproximation
                });
                //卫星环绕
                var satellitePath = computePosition(path, 1);
                var satelliteEntity = viewer.entities.add({
                    // 将实体availability设置为与模拟时间相同的时间间隔。
                    availability: new Cesium.TimeIntervalCollection([new Cesium.TimeInterval({
                        start: start,
                        stop: stop
                    })]),
                    //计算实体位置属性
                    position: satellitePath,
                    //基于位置移动自动计算方向.
                    orientation: new Cesium.VelocityOrientationProperty(satellitePath),
                    //加载飞机模型
                    model: {
                        uri: './src/assets/scene/scene.gltf',
                        minimumPixelSize: 32,
                        scale: 2000.0,
                    },
                    //白色路径
                    path: {
                        resolution: 1,
                        material: new Cesium.PolylineGlowMaterialProperty({
                            glowPower: 0.1,
                            color: Cesium.Color.PINK
                        }),
                        width: 5
                    }
                });
                //插值器
                satelliteEntity.position.setInterpolationOptions({
                    interpolationDegree: 5,
                    interpolationAlgorithm: Cesium.LagrangePolynomialApproximation
                });
            }
            startSimulation('lon',120)