2025-03-11 08:25:45 +00:00
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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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2025-03-19 03:00:22 +00:00
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<link rel="stylesheet" href="./../../libs/cesium/Cesium1.98/Widgets/widgets.css">
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<script type="text/javascript" src="./../../libs/cesium/Cesium1.98/Cesium.js"></script>
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2025-03-11 08:25:45 +00:00
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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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});
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// 开启帧率
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viewer.scene.debugShowFramesPerSecond = true;
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// 加载默认地形
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viewer.terrainProvider = Cesium.createWorldTerrain({
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requestWaterMask: true, // 请求水掩膜以实现水体效果
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requestVertexNormals: true // 请求法线以实现光照效果
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});
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// 深度监测
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viewer.scene.globe.depthTestAgainstTerrain = true;
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viewer.camera.setView({
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destination: Cesium.Cartesian3.fromDegrees(98.71707797694049, 27.677299704639537, 50000.0)
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});
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start();
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function start() {
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viewer.entities.removeAll(); //删除所有
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let waterHeight = 1000
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let targertWaterHeight = 3600
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let speed;
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let times;
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var startTime = Cesium.JulianDate.now();
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const redPolygon = viewer.entities.add({
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name: "最简单的贴地面",
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polygon: {
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extrudedHeight: new Cesium.CallbackProperty(function () {
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console.log(startTime)
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console.log(Cesium.JulianDate.now())
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// 要按流速速度的话，加时间判断即可
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waterHeight += 2;
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if (waterHeight > targertWaterHeight) {
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waterHeight = targertWaterHeight;
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}
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return waterHeight;
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}, false),
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hierarchy: Cesium.Cartesian3.fromDegreesArray([
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98.676842346815, 27.571578111198868,
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98.86252156624968, 27.77444519911974,
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98.76756234288729, 27.800244194152533,
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98.57088699052892, 27.72492584876768,
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98.676842346815, 27.571578111198868,
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]),
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material: new Cesium.Color.fromBytes(64, 157, 253, 150),
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perPositionHeight: true,
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},
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});
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}
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//创建polygon外接矩形，并生成点格网，返回所有格网点坐标
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// function buildPolygonGrid(positions) {
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// const tempPoints = []
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// for (let i = 0; i < positions.length; i++) {
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// cid;
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// var cartographic = ellipsoid.cartesianToCartographic(positions[i]);
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// var lat = Cesium.Math.toDegrees(cartographic.latitude);
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// var lng = Cesium.Math.toDegrees(cartographic.longitude);
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// tempPoints.push([lng, lat]);
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// }
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// //生成外接矩形
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// var line = turf.lineString(tempPoints);
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// var bbox = turf.bbox(line);
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// var bboxPolygon = turf.bboxPolygon(bbox);
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// var area = turf.area(bboxPolygon);
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// //生成格网
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// //计算网格点之间的距离，尽量保证范围内有1万个左右格网点。
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// var cellSide = Math.sqrt(area / 1000000) / 100;
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// var options = { units: 'kilometers' };
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// var grid = turf.pointGrid(bbox, cellSide, options);
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// const gridPositions = [];
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// grid.features.forEach(f => {
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// gridPositions.push(Cesium.Cartographic.fromDegrees(f.geometry.coordinates[0], f.geometry.coordinates[1]));
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// })
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// const promise = Cesium.sampleTerrainMostDetailed(terrain, gridPositions);
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// let maxHeight = 0;
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// let minHeight = 10000.0;
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// Promise.resolve(promise).then(function (updatedPositions) {
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// for (let i = 0; i < updatedPositions.length; i++) {
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// let height = updatedPositions[i].height;
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// //获取格网点处地形高度
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// minHeight = height < minHeight ? height : minHeight;
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// maxHeight = height > maxHeight ? height : maxHeight;
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// }
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// document.getElementById("maxHeight").value = maxHeight;
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// document.getElementById("minHeight").value = minHeight;
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// });
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// }
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</script>
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</body>
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</html>
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