Cesium 百度图层教程

百度图层 ·Baidu Layer· ▶ 在线运行案例案例合集三维可视化功能案例threehub.cn开源仓库github地址https://github.com/z2586300277/three-cesium-examples400个案例代码:网盘链接你将学到什么Scene / Camera / Renderer 标准渲染管线搭建案例完整源码结构与可复用初始化模板效果说明本案例演示百度图层效果基于 WebGL 实现「百度图层」可视化效果附完整可运行源码。建议先打开文首在线案例查看动态画面再对照下方源码逐步理解。核心概念Viewer聚合 Scene、Camera、Clock 与渲染循环是 Cesium 应用入口。阅读下方完整源码时建议从init/load/animate三条主线入手再深入 shader 与工具函数。实现步骤创建 Viewer配置地形/影像若案例需要并设置初始相机在requestAnimationFrame循环中更新状态并 renderCesium 为viewer.render或自动渲染代码要点import * as Cesium from cesiumconst box document.getElementById(box)const viewer new Cesium.Viewer(box, {animation: false,//是否创建动画小器件左下角仪表baseLayerPicker: false,//是否显示图层选择器右上角图层选择按钮baseLayer: false,fullscreenButton: false,//是否显示全屏按钮右下角全屏选择按钮geocoder: false,//是否显示geocoder小器件右上角查询按钮homeButton: false,//是否显示Home按钮右上角home按钮sceneMode: Cesium.SceneMode.SCENE3D,//初始场景模式sceneModePicker: false,//是否显示3D/2D选择器右上角按钮navigationHelpButton: false,//是否显示右上角的帮助按钮selectionIndicator: false,//是否显示选取指示器组件timeline: false,//是否显示时间轴infoBox: false,//是否显示信息框scene3DOnly: true,//如果设置为true则所有几何图形以3D模式绘制以节约GPU资源orderIndependentTranslucency: false, //是否启用无序透明contextOptions: { webgl: { alpha: true } },skyBox: new Cesium.SkyBox({ show: false })})viewer.scene.sun.show falseviewer.scene.moon.show falseviewer.scene.skyBox.show falseviewer.scene.backgroundColor new Cesium.Color(0.0, 0.0, 0.0, 0.0)viewer._cesiumWidget._creditContainer.style.display none/百度 影像服务/ class BaiduImageryProvider {constructor(options) {// 创建错误事件对象 this._errorEvent new Cesium.Event()// 定义瓦片宽度和高度 this._tileWidth 256this._tileHeight 256// 定义最大和最小级别 this._maximumLevel 18this._minimumLevel 1// 定义瓦片范围的南西角和东北角坐标 let southwestInMeters new Cesium.Cartesian2(-33554054, -33746824)let northeastInMeters new Cesium.Cartesian2(33554054, 33746824)// 创建 WebMercatorTilingScheme 对象 this._tilingScheme new Cesium.WebMercatorTilingScheme({rectangleSouthwestInMeters: southwestInMeters,rectangleNortheastInMeters: northeastInMeters})// 获取瓦片范围 this._rectangle this._tilingScheme.rectangle// 创建资源对象 this._resource Cesium.Resource.createIfNeeded(options.url)// 设置其他属性的初始值 this._tileDiscardPolicy undefinedthis._credit undefinedthis._readyPromise undefined}// 定义属性访问器 get url() {return this._resource.url}get proxy() {return this._resource.proxy}get tileWidth() {if (!this.ready) throw new Cesium.DeveloperError(tileWidth must not be called before the imagery provider is ready.)return this._tileWidth }get tileHeight() {if (!this.ready) throw new Cesium.DeveloperError(tileHeight must not be called before the imagery provider is ready.)return this._tileHeight}get maximumLevel() {if (!this.ready) throw new Cesium.DeveloperError(maximumLevel must not be called before the imagery provider is ready.)return this._maximumLevel}get minimumLevel() {if (!this.ready) throw new Cesium.DeveloperError(minimumLevel must not be called before the imagery provider is ready.)return this._minimumLevel}get tilingScheme() {if (!this.ready) throw new Cesium.DeveloperError(tilingScheme must not be called before the imagery provider is ready.)return this._tilingScheme}get tileDiscardPolicy() {if (!this.ready) throw new Cesium.DeveloperError(tileDiscardPolicy must not be called before the imagery provider is ready.)return this._tileDiscardPolicy}get rectangle() {if (!this.ready) throw new Cesium.DeveloperError(rectangle must not be called before the imagery provider is ready.)return this._rectangle}get errorEvent() {return this._errorEvent}get ready() {return this._resource}get readyPromise() {return this._readyPromise}get credit() {if (!this.ready) {throw new Cesium.DeveloperError(credit must not be called before the imagery provider is ready.)}return this._credit}// 请求影像数据 requestImage(x, y, level, request) {let xTileCount this._tilingScheme.getNumberOfXTilesAtLevel(level)let yTileCount this._tilingScheme.getNumberOfYTilesAtLevel(level)// 构建请求 URL let url this.url.replace({x}, x - xTileCount / 2).replace({y}, yTileCount / 2 - y - 1).replace({z}, level).replace({s}, Math.floor(10 * Math.random()))// 加载影像数据 return Cesium.ImageryProvider.loadImage(this, url)}}viewer.imageryLayers.addImageryProvider(new BaiduImageryProvider({url: https://maponline0.bdimg.com/tile/?qtvtilex{x}y{y}z{z}stylesplscaler1udt20210709}))完整源码GitHub小结本文提供百度图层完整 Cesium.js 源码与在线 Demo建议先运行案例再改 uniform/参数做二次实验更多 Cesium.js 实战案例见 three-cesium-examples 合集 与 GitHub 开源仓库