var viewer = new Cesium.Viewer('cesiumContainer', { sceneMode: 2, infoBox: false, //Disable InfoBox widget selectionIndicator: false, //Disable selection indicator shouldAnimate: true, // Enable animations terrainProvider: Cesium.createWorldTerrain() }); //Enable lighting based on the sun position viewer.scene.globe.enableLighting = true; //Enable depth testing so things behind the terrain disappear. viewer.scene.globe.depthTestAgainstTerrain = true; //Set the random number seed for consistent results. Cesium.Math.setRandomNumberSeed(3); //Set bounds of our simulation time var start = Cesium.JulianDate.fromDate(new Date(2015, 2, 25, 16)); var stop = Cesium.JulianDate.addSeconds(start, 360, new Cesium.JulianDate()); //Make sure viewer is at the desired time. viewer.clock.startTime = start.clone(); viewer.clock.stopTime = stop.clone(); viewer.clock.currentTime = start.clone(); viewer.clock.clockRange = Cesium.ClockRange.LOOP_STOP; //Loop at the end viewer.clock.multiplier = 10; //Set timeline to simulation bounds viewer.timeline.zoomTo(start, stop); function computeCirclularFlight(start) { var polyLinePositions=[ [70, 20, ,], [-80, 44, ,], [-90, 18, ,], [-98, 52, ,] ] var property = new Cesium.SampledPositionProperty(); for (var i = 0; i < polyLinePositions.length; i++) { var time = Cesium.JulianDate.addSeconds(start, i * 10, new Cesium.JulianDate()); // 将经纬度坐标转换为三维空间坐标 var position = Cesium.Cartesian3.fromDegrees(polyLinePositions[i][0], polyLinePositions[i][1], polyLinePositions[i][2]); // Property最大的特点是和时间相互关联，在不同的时间可以动态地返回不同的属性值; // Entity则可以感知这些Property的变化，在不同的时间驱动物体进行动态展示; property.addSample(time, position); } return property; } //Compute the entity position property. var position = computeCirclularFlight(start); //Actually create the entity var entity = viewer.entities.add({ //Set the entity availability to the same interval as the simulation time. availability : new Cesium.TimeIntervalCollection([new Cesium.TimeInterval({ start : start, stop : stop })]), //Use our computed positions position : position,//Automatically compute orientation based on position movement. orientation : new Cesium.VelocityOrientationProperty(position), //Load the Cesium plane model to represent the entity "billboard" : { "image" : "data:image/svg+xml;base64,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", "scale" : 0.5, "alignedAxis" : new Cesium.VelocityVectorProperty(position, true) }, //将路径显示为以0.1秒为增量采样的路径线。 path : { resolution : 0.1, material : new Cesium.PolylineGlowMaterialProperty({ glowPower : 0.1, color : Cesium.Color.YELLOW }), width :3 }, // 贴底线 // polyline : { // positions : Cesium.Cartesian3.fromDegreesArray([70, 20,-80, 44,-90, 18,-98, 52,]), // width : 3, // material : Cesium.Color.YELLOW, // clampToGround : true // } }); //~~~~~~~~~~~~~~~~~~~~平滑插值~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // entity.position.setInterpolationOptions({ // interpolationDegree:5, //1 2 5 // interpolationAlgorithm: Cesium.LagrangePolynomialApproximation // })
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