2025-04-06 01:30:00 +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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<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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<script src="./turf.min.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="map3" style="margin: 0 auto; width: 100%; height: 100%;float: left;"></div>
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<script type="text/javascript">
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// 三维
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2025-05-29 02:59:44 +00:00
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Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiIyNDMxOTA2NS1lY2Q3LTQ0YmUtOTE1Mi1iNWE2OGYwZjc0MjkiLCJpZCI6MjM1NjMwLCJpYXQiOjE3MzA3MjQzMTJ9.Xhu-9FyVEyqBKWEr0V9Sybt-elTCWHt9peL9-mNh-4E'
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2025-04-06 01:30:00 +00:00
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const viewer = new Cesium.Viewer('map3', {});
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// 全局事件监听
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var handler = new Cesium.ScreenSpaceEventHandler(viewer.canvas)
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// 移入三维
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handler.setInputAction(function (event) {
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open3d()
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}, Cesium.ScreenSpaceEventType.MOUSE_MOVE)
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// 关闭之前所有事件
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function closeO() {
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try {
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handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_UP)
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handler.removeInputAction(Cesium.ScreenSpaceEventType.WHEEL)
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} catch (error) { }
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}
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// 进入3d，监听3d事件
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function open3d() {
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closeO()
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handler.setInputAction(function (event) {
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liandong3D2D()
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}, Cesium.ScreenSpaceEventType.WHEEL)
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handler.setInputAction(function (event) {
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liandong3D2D()
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}, Cesium.ScreenSpaceEventType.LEFT_UP)
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}
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// 3d联动2d
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function liandong3D2D() {
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var rectangle = viewer.camera.computeViewRectangle()
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var west = (rectangle.west / Math.PI) * 180
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var north = (rectangle.north / Math.PI) * 180
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var east = (rectangle.east / Math.PI) * 180
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var south = (rectangle.south / Math.PI) * 180
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function calculateCellSide(bbox, N, units = 'kilometers') {
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const bboxPolygon = turf.bboxPolygon(bbox);
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const areaMeters = turf.area(bboxPolygon);
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let area;
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switch (units) {
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case 'kilometers': area = areaMeters / 1e6; break;
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case 'miles': area = areaMeters / 2589988.1103; break;
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default: area = areaMeters;
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}
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const hexArea = area / N;
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return Math.sqrt((2 * hexArea) / (3 * Math.sqrt(3)));
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}
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var bbox = [west , north , east , south ];
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const desiredCount = 100; // 目标生成100个六边形
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const units = 'kilometers';
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const cellSide = calculateCellSide(bbox, desiredCount, units);
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const hexGrid = turf.hexGrid(bbox, cellSide, { units });
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viewer.scene.primitives.removeAll();
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const geometryInstances = [];
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hexGrid.features.forEach((hex) => {
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let boundary = hex.geometry.coordinates
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const positions = boundary.map(([lat, lon]) =>
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Cesium.Cartesian3.fromDegrees(lon, lat)
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);
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const height = 1;
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const polygon = new Cesium.PolygonOutlineGeometry({
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polygonHierarchy: new Cesium.PolygonHierarchy(Cesium.Cartesian3.fromDegreesArray(boundary.flat().flat())),
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extrudedHeight: height,
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height: 0,
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});
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const instance = new Cesium.GeometryInstance({
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geometry: polygon,
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attributes: {
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color: Cesium.ColorGeometryInstanceAttribute.fromColor(
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Cesium.Color.fromBytes(220, 20, 60, 200)
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),
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},
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});
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geometryInstances.push(instance);
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});
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const primitive = new Cesium.Primitive({
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geometryInstances: geometryInstances,
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appearance: new Cesium.PerInstanceColorAppearance({
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flat: true,
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translucent: true,
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renderState: {
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// 禁用抗锯齿
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lineSmooth: false,
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// 直接设置线条宽度
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lineWidth: 10,
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},
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}),
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});
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viewer.scene.primitives.add(primitive);
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}
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</script>
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</body>
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</html>
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