# cesium-水面动态提升高度
# 介绍
模拟实现水面的淹没效果：
- 先准备一个DEMO数据
- 然后创建一个长方体Entity
- 将长方体置于DEM底下
- 使用回调方法动态提升Entity高度
- 模拟实现淹没效果
# 核心代码
/**
*
* @param {*} targetHeight 目标高度
* @param {*} areaCoor 范围坐标
* @param {*} waterHeight 当前水高度
*/
drawWater(targetHeight, areaCoor, waterHeight) {
let that = this;
that._viewer.entities.remove(that.waterEntity);
that.waterEntity = that._viewer.entities.add({
polygon : {
hierarchy : Cesium.Cartesian3.fromDegreesArrayHeights(areaCoor),
perPositionHeight: true,
extrudedHeight: new Cesium.CallbackProperty(function () { //此处用属性回调函数，直接设置extrudedHeight会导致闪烁。
waterHeight+=2;
if(waterHeight>targetHeight){
waterHeight=targetHeight;//给个最大值
}
return waterHeight
},false),
material : new Cesium.Color.fromBytes(0,191,255,100),
}
});
}
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# 完整代码
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Use correct character set. -->
<meta charset="utf-8"/>
<!-- Tell IE to use the latest, best version. -->
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<!-- Make the application on mobile take up the full browser screen and disable user scaling. -->
<meta name="viewport"
content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"/>
<title>cesium-水面提升高度</title>
<script src="../lib/Cesium-1.89/Build/Cesium/Cesium.js"></script>
<script src="../../static/lib/vue.min.js"></script>
<style>
@import url(../lib/Cesium-1.89/Build/Cesium/Widgets/widgets.css);
html,
body, #temp {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
#cesiumContainer {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
</style>
</head>
<body>
<div id="temp">
<div style="display: -webkit-flex;display: flex;width: 100%;height: 100%">
<div style="width: 90%;height: 100%">
<div id="cesiumContainer"></div>
</div>
<div style="width: 10%;height: 100%;background-color: #d3d3d3;padding: 30px">
<button class="btn" @click="addWaterAnimate">添加水面动画</button>
</div>
</div>
</div>
<script>
let EarthComp = new Vue({
el: "#temp",
data: {
_earth: undefined, // 注意：Earth和Cesium的相关变量放在vue中，必须使用下划线作为前缀！
_viewer: undefined,
model: null,//切片模型
marks: [],
marksIndex: 1,
pitchValue: -10,
remainTime: 0,
usedTime: 0,
},
mounted: function () {
let that = this;
this.earthInit();
},
methods: {
/**
* 地球初始化
*/
earthInit() {
//天地图token
let TDT_tk = "tdt_token";
//Cesium token
let cesium_tk = "token";
//标注
let TDT_CIA_C = "http://{s}.tianditu.gov.cn/cia_c/wmts?service=wmts&request=GetTile&version=1.0.0" +
"&LAYER=cia&tileMatrixSet=c&TileMatrix={TileMatrix}&TileRow={TileRow}&TileCol={TileCol}" +
"&style=default&format=tiles&tk=" + TDT_tk;
// 添加mapbox自定义地图实例
let layer = new Cesium.MapboxStyleImageryProvider({
url: 'https://api.mapbox.com/styles/v1',
username: 'sungang',
styleId: 'styleId',
accessToken: 'accessToken',
scaleFactor: true
});
//初始页面加载
Cesium.Ion.defaultAccessToken = cesium_tk;
let viewer = new Cesium.Viewer('cesiumContainer', {
geocoder: false, // 位置查找工具
baseLayerPicker: false,// 图层选择器（地形影像服务）
timeline: false, // 底部时间线
homeButton: false,// 视角返回初始位置
fullscreenButton: false, // 全屏
animation: false, // 左下角仪表盘（动画器件）
sceneModePicker: false,// 选择视角的模式（球体、平铺、斜视平铺）
navigationHelpButton: false, //导航帮助按钮
imageryProvider: layer
});
//调用影响中文注记服务
viewer.imageryLayers.addImageryProvider(new Cesium.WebMapTileServiceImageryProvider({
url: TDT_CIA_C,
layer: "tdtImg_c",
style: "default",
format: "tiles",
tileMatrixSetID: "c",
subdomains: ["t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7"],
tilingScheme: new Cesium.GeographicTilingScheme(),
tileMatrixLabels: ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19"],
maximumLevel: 50,
show: false
}))
this._viewer = viewer;
// 去除版权信息
this._viewer._cesiumWidget._creditContainer.style.display = "none";
// 初始化dem位置
this.addDem();
},
/**
* 添加模型
*/
addDem() {
let that = this;
let terrainProvider = new Cesium.CesiumTerrainProvider({
url: '../res/data/dem/ASTGTM_N29E087D'
});
that._viewer.terrainProvider = terrainProvider;
that._viewer.camera.flyTo({
destination: Cesium.Cartesian3.fromDegrees(87.54791, 29.57025, 17863.0),
orientation: {
heading: Cesium.Math.toRadians(0.0),
pitch: Cesium.Math.toRadians(-25.0),
roll: 0.0
}
});
},
/**
* 添加水面动画
*/
addWaterAnimate(){
let that = this;
let globe = this._viewer.scene.globe;
globe.depthTestAgainstTerrain = true;
this._viewer.camera.setView({//定位到范围中心点
destination: Cesium.Cartesian3.fromDegrees(87.07131373100303, 29.40857655725876, 12000),
orientation: {
heading: Cesium.Math.toRadians(130.304929908965146),//1
pitch: Cesium.Math.toRadians(-17.364771143804237),
roll:0.09931507517437696
}
});
let points=[
[87.07131373100303, 29.40857655725876],
[87.33503858397042, 29.41843499494008],
[87.33072496578943, 29.193059292424955],
[87.05098771260403, 29.20286249623694]
]
let polygonArr=[];
for(let i=0;i<points.length;i++){
polygonArr.push(points[i][0]);
polygonArr.push(points[i][1]);
polygonArr.push(0);
}
that.drawWater(4500,polygonArr,4000);
},
/**
*
* @param {*} targetHeight 目标高度
* @param {*} areaCoor 范围坐标
* @param {*} waterHeight 当前水高度
*/
drawWater(targetHeight, areaCoor, waterHeight) {
let that = this;
that._viewer.entities.remove(that.waterEntity);
that.waterEntity = that._viewer.entities.add({
polygon : {
hierarchy : Cesium.Cartesian3.fromDegreesArrayHeights(areaCoor),
perPositionHeight: true,
extrudedHeight: new Cesium.CallbackProperty(function () { //此处用属性回调函数，直接设置extrudedHeight会导致闪烁。
waterHeight+=2;
if(waterHeight>targetHeight){
waterHeight=targetHeight;//给个最大值
}
return waterHeight
},false),
material : new Cesium.Color.fromBytes(0,191,255,100),
}
});
},
},
})
</script>
</body>
</html>
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# 实现效果
← 天气效果 添加水面动态贴图效果 →