【超图+CESIUM】【基础API使用示例】45、超图｜CESIUM - 点光源设置
前言
缺少前置学习使用资料，请自行查阅：[https://blog.csdn.net/weixin_44402694/article/details/123110136](https://blog.csdn.net/weixin_44402694/article/details/123110136)
以下示例使用到的公共静态资料，不建议下载，建议官网自行下载超图Build资源，示例所涉及图片会在示例使用到时提供出来。如有需要可下载：[https://download.csdn.net/download/weixin_44402694/82180350](https://download.csdn.net/download/weixin_44402694/82180350)。
点光源设置。
使用
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效果
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完整代码
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>光源 - 点光源设置title>
<link href="./public/Build/Cesium/Widgets/widgets.css" rel="stylesheet" />
<script
type="text/javascript"
src="./public/Build/Cesium/Cesium.js"
>script>
<style>
* {
margin: 0;
padding: 0;
}
html,
body,
#cesium-container {
width: 100%;
height: 100%;
}
.panel {
position: fixed;
left: 10px;
top: 10px;
z-index: 1;
background-color: #fff;
padding: 10px;
}
.panel .btn {
cursor: pointer;
}
style>
head>
<body>
<div id="cesium-container" />
<div class="panel">
<p class="btn">添加点光源p>
<p class="btn">清除点光源p>
div>
<script>
// 前置引入echarts｜echartlayer js脚本
let viewer, scene, pointLight
window.onload = function () {
viewer = new Cesium.Viewer('cesium-container')
scene = viewer.scene
loadModelHandler()
initBindBtnEventHandler()
}
// 初始化绑定按钮的点击事件
function initBindBtnEventHandler() {
const btns = document.querySelectorAll('.panel .btn')
btns[0].addEventListener('click', () => {
activeCurrentClickBtnHandler(0)
addPointLightHandler()
})
btns[1].addEventListener('click', () => {
activeCurrentClickBtnHandler(1)
removePointLightHandler()
})
}
// 加载模型
function loadModelHandler() {
const promise = viewer.scene.open(
'http://www.supermapol.com/realspace/services/3D-BIMbuilding/rest/realspace'
)
Cesium.when(promise, () => {
setSceneCameraViewHandler()
})
}
// 添加点光源到场景中
function addPointLightHandler() {
const position = new Cesium.Cartesian3(
-2180734.470505298,
4379055.704271189,
4092558.53920364
)
const options = {
color: new Cesium.Color(1, 1, 1, 1), // 光源颜色
cutoffDistance: 10, // 扩散距离
decay: 1, // 衰减因子
intensity: 20, // 光源强度
}
pointLight = new Cesium.PointLight(position, options)
scene.addLightSource(pointLight)
}
// 删除点光源
function removePointLightHandler() {
scene.removeLightSource(pointLight)
}
// 设置场景指定视角
function setSceneCameraViewHandler() {
scene.camera.setView({
destination: new Cesium.Cartesian3(
-2180753.065987198,
4379023.266141494,
4092583.575045952
),
orientation: {
heading: 4.0392222751147955,
pitch: 0.010279641987852584,
roll: 1.240962888005015e-11,
},
})
}
// 高亮当前点击的按钮
function activeCurrentClickBtnHandler(idx) {
const btns = document.querySelectorAll('.panel .btn')
Array.from(btns).forEach((btn, index) => {
btn.style.color = index === idx ? 'red' : '#000'
})
}
script>
body>
html>