只贴实现淹没分析这块的代码。
import styles from ‘./cesium.less‘; import React from ‘react‘; import Cesium from ‘cesium/Cesium‘; Cesium.BingMapsApi.defaultKey = ‘必应地图Key.具体请自己申请‘; require(‘cesium/Widgets/widgets.css‘); export default class CesiumPage extends React.Component { state = { log_String: ‘‘, lat_String: ‘‘, alti_String: ‘‘, adapCoordi: [], maxHeight: 0, } componentDidMount() { this.initCesium(); } initCesium = () => { const url = ‘https://dev.virtualearth.net‘; let viewer = new Cesium.Viewer(‘cesiumContainer‘, { scene3DOnly: true, selectionIndicator: false, //geocoder: false, //是否显示地名查找控件 //homeButton: true, baseLayerPicker:false, //是否显示图层选择控件 // navigationHelpButton:false, //animation: false, // 是否创建动画小器件,左下角仪表 //timeline: false, //是否显示时间线控件 //vrButton: false, //是否展示VR按钮 //fullscreenButton: true, //右下角全屏按钮 }); viewer.cesiumWidget.creditContainer.style.display = ‘none‘; //使用必应地图作为底图 viewer.imageryLayers.addImageryProvider(new Cesium.BingMapsImageryProvider({ url: url, mapStyle: Cesium.BingMapsStyle.AERIAL })) //增加地形、 viewer.terrainProvider = new Cesium.CesiumTerrainProvider({ url: "http://data.marsgis.cn/terrain",//中国地形 //url: Cesium.IonResource.fromAssetId(1), //世界地形 requestWaterMask: false, // 增加水文 requestVertexNormals: false, //增加光线 }) //启用深度测试以使地形后的物体被挡住 viewer.scene.globe.depthTestAgainstTerrain = false; //绑定鼠标移动时,实时显示坐标及高度 this.coordinateShow(viewer); /* let initialPosition = new Cesium.Cartesian3.fromDegrees(107.5116,29.4605, 4120); let homeCameraView = {destination : initialPosition,}; viewer.scene.camera.setView(homeCameraView); */ //设置镜头到具体位置及角度 this.setPointAdress(viewer); this.viewer = viewer; } //鼠标移动实时显示坐标及视角高度函数 coordinateShow = (viewer) => { let _this = this, canvas= viewer.scene.canvas; //具体事件的实现 let ellipsoid=viewer.scene.globe.ellipsoid; let handler = new Cesium.ScreenSpaceEventHandler(canvas); handler.setInputAction(function(movement){ //捕获椭球体,将笛卡尔二维平面坐标转为椭球体的笛卡尔三维坐标,返回球体表面的点 let cartesian=viewer.camera.pickEllipsoid(movement.endPosition, ellipsoid); if(cartesian){ //将笛卡尔三维坐标转为地图坐标(弧度) let cartographic=viewer.scene.globe.ellipsoid.cartesianToCartographic(cartesian); //将地图坐标(弧度)转为十进制的度数 let lat_String=Cesium.Math.toDegrees(cartographic.latitude).toFixed(4), log_String=Cesium.Math.toDegrees(cartographic.longitude).toFixed(4), alti_String=(viewer.camera.positionCartographic.height/1000).toFixed(2); _this.setState({ log_String, lat_String, alti_String }) } },Cesium.ScreenSpaceEventType.MOUSE_MOVE); } //设置视角位置及角度 setPointAdress = (viewer) => { const centerPoint = [107.52, 29.422]; viewer.camera.flyTo({ destination : Cesium.Cartesian3.fromDegrees(...centerPoint, 1500), // 设置位置 orientation: { heading : Cesium.Math.toRadians(-10.0), // 方向 pitch : Cesium.Math.toRadians(-5.0),// 倾斜角度 roll : 0, //Cesium.Math.toRadians(-38.0) }, duration:5, // 设置飞行持续时间,默认会根据距离来计算 complete: function () { // 到达位置后执行的回调函数 console.log(‘到达目的地‘); }, cancle: function () { // 如果取消飞行则会调用此函数 console.log(‘飞行取消‘) }, pitchAdjustHeight: -90, // 如果摄像机飞越高于该值,则调整俯仰俯仰的俯仰角度,并将地球保持在视口中。 maximumHeight:5000, // 相机最大飞行高度 flyOverLongitude: 100, // 如果到达目的地有2种方式,设置具体值后会强制选择方向飞过这个经度 }); } setIf = () => { let _this = this; _this.drawPolygon((positions) => { let wgs84_positions = [], areaAdapCoordi = [], maxHeight = 0; for(var i=0; i<positions.length; i++){ var wgs84_point = _this.Cartesian3_to_WGS84({ x: positions[i].x, y: positions[i].y, z: positions[i].z }); wgs84_positions.push(wgs84_point); } //获取鼠标点击的位置高度貌似有问题,为了呈现水的高度,所以手动调增*300米。 maxHeight = Math.max(...wgs84_positions.map(item => item.alt * 300)); wgs84_positions.map(item => [item.lng, item.lat, item.alt]).map(item => item.forEach(e => areaAdapCoordi.push(e))); this.setState({ adapCoordi: areaAdapCoordi,//设置选取位置的坐标 maxHeight: maxHeight // 设置最高高度,即水漫到多高 }) }); } //画面 drawPolygon = (callback) => { var _this = this; var PolygonPrimitive = (function () { function _(positions) { this.options = { id:‘drawPolygonforwater‘, name: ‘多边形‘, polygon: { hierarchy: [], perPositionHeight: true, material: Cesium.Color.RED.withAlpha(0.5), outline : true, outlineColor : Cesium.Color.WHITE, outlineWidth : 4, } }; this.hierarchy = positions; this._init(); } _.prototype._init = function () { var _self = this; var _update = function () { return _self.hierarchy; }; //实时更新polygon.hierarchy this.options.polygon.hierarchy = new Cesium.CallbackProperty(_update, false); _this.viewer.entities.add(this.options); }; return _; })(); var handler = new Cesium.ScreenSpaceEventHandler(_this.viewer.scene.canvas); var positions = []; var poly = undefined; //鼠标单击画点 handler.setInputAction(function (movement) { let cartesian=_this.viewer.scene.camera.pickEllipsoid(movement.position, _this.viewer.scene.globe.ellipsoid); if (positions.length === 0) { positions.push(cartesian.clone()); } positions.push(cartesian); }, Cesium.ScreenSpaceEventType.LEFT_CLICK); //鼠标移动 handler.setInputAction(function (movement) { var cartesian = _this.viewer.scene.camera.pickEllipsoid(movement.endPosition, _this.viewer.scene.globe.ellipsoid); if (positions.length >= 2) { if (!Cesium.defined(poly)) { poly = new PolygonPrimitive(positions); } else { if(cartesian !== undefined){ positions.pop(); cartesian.y += (1 + Math.random()); positions.push(cartesian); } } } }, Cesium.ScreenSpaceEventType.MOUSE_MOVE); //鼠标右键单击结束绘制 handler.setInputAction(function (movement) { handler.destroy(); callback(positions); }, Cesium.ScreenSpaceEventType.RIGHT_CLICK); } //笛卡尔坐标系转WGS84坐标系 Cartesian3_to_WGS84 = (point) => { let cartesian33 = new Cesium.Cartesian3(point.x, point.y, point.z), cartographic = Cesium.Cartographic.fromCartesian(cartesian33), lat = Cesium.Math.toDegrees(cartographic.latitude), lng = Cesium.Math.toDegrees(cartographic.longitude), alt = cartographic.height; return {lat: lat, lng: lng, alt: alt}; } _drawWater = () => { const { maxHeight } = this.state; const targetHeight = maxHeight; let _this = this; //移除选取的多边形 _this.viewer.entities.removeById(‘drawPolygonforwater‘); //将全局的 地形设置改为地形遮挡,这样山体可将水漫立方体挡住 _this.viewer.scene.globe.depthTestAgainstTerrain = !0; const { adapCoordi } = this.state; this.viewer.entities.removeById(‘polygonforwaterYanmo‘); let WaterPolygonPrimitive = (function () { function _(height) { this.options = { id:‘polygonforwaterYanmo‘, name: ‘水文立方体‘, polygon: { hierarchy: Cesium.Cartesian3.fromDegreesArrayHeights(adapCoordi), material: Cesium.Color.CORNFLOWERBLUE.withAlpha(0.8), perPositionHeight: true, extrudedHeight: 0, } }; this.extrudedHeight = height; this._init(); } _.prototype._init = function () { var _self = this; var _update = function () { return _self.extrudedHeight; }; //实时更新polygon.extrudedHeight this.options.polygon.extrudedHeight = new Cesium.CallbackProperty(_update, false); _this.viewer.entities.add(this.options); }; return _; })(); let height = 0, warterEn = new WaterPolygonPrimitive(height), waterHeight = 0; this.timer = setInterval(() => { if (waterHeight < targetHeight) { waterHeight += 2 if (waterHeight > targetHeight) { waterHeight = targetHeight } warterEn.extrudedHeight = waterHeight; } }, 100); } render() { const { log_String, lat_String, alti_String } = this.state; return (<div className={styles.cesium}> <button onClick={() => this.setIf()}>绘制区域</button> <button style={{marginLeft: 8}} onClick={() => this._drawWater()}>开始分析</button> <div id="cesiumContainer" className={styles.cesiumContainer}> <div className={styles.latlng_show}> <div className={styles.latlng_show_log}> <font size="3" color="white">经度:<span>{log_String}</span></font> </div> <div className={styles.latlng_show_lat}> <font size="3" color="white">纬度:<span>{lat_String}</span></font> </div> <div className={styles.latlng_show_alt}> <font size="3" color="white">视角高:<span>{alti_String}</span>km</font> </div> </div> </div> </div>); } }