这篇文章主要介绍了怎么在vue项目中使用cesium的相关知识,内容详细易懂,操作简单快捷,具有一定借鉴价值,相信大家阅读完这篇怎么在vue项目中使用cesium文章都会有所收获,下面我们一起来看看吧。
vue使用cesium,使用离线地图资源
第一步:创建vue项目并下载最新版本的Cesium
注意最好下载最新的版本(当前是1.91),以确保可以流畅使用官方API。
npm cesium
第二步:在node_modules文件夹中补充离线资源
在项目根目录的node_modules文件夹中,找到cesium文件夹,
根据以下2个路径:node_modulescesiumBuildCesiumAssetsTextures和node_modulescesiumSourceAssetsTextures找到用于存放离线地图的文件夹。
在这个文件夹下,补充离线地图数据(这个资源需要大家自己在网络上找)。
第三步:使用cesium生成地球
1.在vue文件中创建html结构
<div id="container"></div>
2.利用cesium构造函数初始化地球
别忘了在
data中定义空对象
viewer
this.viewer = new Cesium.Viewer("container", { geocoder: false, timeline: false, fullscreenButton: false, animation: false, shouldAnimate: true, });
第四步:使用离线地图资源替换网络地图资源
在构造函数中补充以下2个属性:
this.viewer = new Cesium.Viewer("container", { imageryProvider: new Cesium.TileMapServiceImageryProvider({ url: Cesium.buildModuleUrl("Assets/Textures/MyEarthII"), }), baseLayerPicker: false });
最后附上cesium官网对
imageryProvider用法的解释:
The imagery provider to use. This value is only valid if baseLayerPicker is set to false.
用于提供地图图像。仅当
baseLayerPicker为false时有效。
cesium添加百度地图
百度地图的瓦块切片规则与大多数地图不同,其中心点位于地理坐标的0,0点,多数地图的切片是以地图左上角为瓦块切片的起点。
Cesium中默认的切片地图(UrlTemplateImageryProvider)包括经纬度模式和投影(墨卡托)模式都是以左上角切片为基准。所以当我们加载百度地图瓦块地图时,需要自定义地图影像地图类。
BaiduImageryProvider = function(options) { this._errorEvent = new Cesium.Event(); this._tileWidth = 256; this._tileHeight = 256; this._maximumLevel = 18; this._minimumLevel = 1; let southwestInMeters = new Cesium.Cartesian2(-33554054, -33746824); let northeastInMeters = new Cesium.Cartesian2(33554054, 33746824); this._tilingScheme = new Cesium.WebMercatorTilingScheme({ rectangleSouthwestInMeters: southwestInMeters, rectangleNortheastInMeters: northeastInMeters }); this._rectangle = this._tilingScheme.rectangle; this._resource = Cesium.Resource.createIfNeeded(options.url); this._tileDiscardPolicy = undefined; this._credit = undefined; this._readyPromise = undefined; }; Object.defineProperties(Cesium.gm.BaiduImageryProvider.prototype, { url: { get: function () { return this._resource.url; } }, proxy: { get: function () { return this._resource.proxy; } }, tileWidth: { get: function () { if (!this.ready) { throw new Cesium.DeveloperError('tileWidth must not be called before the imagery provider is ready.'); } return this._tileWidth; } }, tileHeight: { get: function () { if (!this.ready) { throw new Cesium.DeveloperError('tileHeight must not be called before the imagery provider is ready.'); } return this._tileHeight; } }, maximumLevel: { get: function () { if (!this.ready) { throw new Cesium.DeveloperError('maximumLevel must not be called before the imagery provider is ready.'); } return this._maximumLevel; } }, minimumLevel: { get: function () { if (!this.ready) { throw new Cesium.DeveloperError('minimumLevel must not be called before the imagery provider is ready.'); } return this._minimumLevel; } }, tilingScheme: { get: function () { if (!this.ready) { throw new Cesium.DeveloperError('tilingScheme must not be called before the imagery provider is ready.'); } return this._tilingScheme; } }, tileDiscardPolicy: { get: function () { if (!this.ready) { throw new Cesium.DeveloperError('tileDiscardPolicy must not be called before the imagery provider is ready.'); } return this._tileDiscardPolicy; } }, rectangle: { get: function () { if (!this.ready) { throw new Cesium.DeveloperError('rectangle must not be called before the imagery provider is ready.'); } return this._rectangle; } }, errorEvent: { get: function () { return this._errorEvent; } }, ready: { get: function () { return this._resource; } }, readyPromise: { get: function () { return this._readyPromise; } }, credit: { get: function () { if (!this.ready) { throw new Cesium.DeveloperError('credit must not be called before the imagery provider is ready.'); } return this._credit; } }, }); BaiduImageryProvider.prototype.requestImage = function (x, y, level, request) { let xTileCount = this._tilingScheme.getNumberOfXTilesAtLevel(level); let yTileCount = this._tilingScheme.getNumberOfYTilesAtLevel(level); 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())); console.log("zxy:" + level + ", " + x + ", " + y + "; " + url); return Cesium.ImageryProvider.loadImage(this, url); };
调用时,传入url参数即可,url服务可以使在线服务,也可以是代理服务(按百度地图切片索引规则)。例如:
let baiduImageryProvider = new BaiduImageryProvider({ url: "http://online{s}.map.bdimg.com/onlinelabel/?qt=tile&x={x}&y={y}&z={z}&styles=pl&scaler=1&p=1" }); let viewer = new Cesium.Viewer('cesiumContainer', { imageryProvider: baiduImageryProvider, ... }
这时就可以在Cesium中正常加载百度地图了。