mirror of
https://github.com/jiawanlong/Cesium-Examples.git
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61 lines
2.8 KiB
HTML
61 lines
2.8 KiB
HTML
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<!--********************************************************************
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* by jiawanlong
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*********************************************************************-->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8" />
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<link rel="stylesheet" href="./../../cesium/Cesium1.98/Widgets/widgets.css">
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<script type="text/javascript" src="./../../cesium/Cesium1.98/Cesium.js"></script>
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</head>
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<body style="margin: 0; overflow: hidden; background: #fff; width: 100%; height: 100%; position: absolute; top: 0">
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<div id="map" style="margin: 0 auto; width: 100%; height: 100%"></div>
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<script type="text/javascript">
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Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiI3ZjQ5ZGUzNC1jNWYwLTQ1ZTMtYmNjYS05YTY4ZTVmN2I2MDkiLCJpZCI6MTE3MTM4LCJpYXQiOjE2NzY0NDUyODB9.ZaNSBIfc1sGLhQd_xqhiSsc0yr8oS0wt1hAo9gbke6M'
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const viewer = new Cesium.Viewer('map', {});
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let position = new Cesium.Cartesian3.fromDegrees(120, 30, 100000);
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// 给定飞行一周所需时间，比如10s, 那么每秒转动度数
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var angle = 360 / 10;
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// 给定相机距离点多少距离飞行，这里取值为5000m
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var distance = 500000;
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var heading = Cesium.Math.toRadians(0);
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var pitch = Cesium.Math.toRadians(-30);
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var startTime = Cesium.JulianDate.fromDate(new Date());
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var stopTime = Cesium.JulianDate.addSeconds(startTime, 10, new Cesium.JulianDate());
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viewer.clock.startTime = startTime.clone(); // 开始时间
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viewer.clock.stopTime = stopTime.clone(); // 结速时间
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viewer.clock.currentTime = startTime.clone(); // 当前时间
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viewer.clock.clockRange = Cesium.ClockRange.CLAMPED; // 行为方式
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viewer.clock.clockStep = Cesium.ClockStep.SYSTEM_CLOCK; // 时钟设置为当前系统时间; 忽略所有其他设置。
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// 相机的当前heading
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var initialHeading = viewer.camera.heading;
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var Exection = function TimeExecution() {
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// 当前已经过去的时间，单位s
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var delTime = Cesium.JulianDate.secondsDifference(viewer.clock.currentTime, viewer.clock.startTime);
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var heading = Cesium.Math.toRadians(delTime * angle) + initialHeading;
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viewer.scene.camera.setView({
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destination: position, // 点的坐标
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orientation: {
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heading: heading,
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pitch: pitch,
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}
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});
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viewer.scene.camera.moveBackward(distance);
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if (Cesium.JulianDate.compare(viewer.clock.currentTime, viewer.clock.stopTime) >= 0) {
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viewer.clock.onTick.removeEventListener(Exection);
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}
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};
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viewer.clock.onTick.addEventListener(Exection);
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</script>
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</body>
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</html>
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