ArcGIS API for Javascript3.23加载百度地图（代码实例）

引言

今天点开arcgis api for javascript官网一看，又更新新版本了【3.23和4.6】。由于之前项目需求用到了谷歌地图、海图这些在线地图，于是这两天突然有了一个想法：整理常用在线地图的引用方法和，包括百度地图、天地图、谷歌地图、高德地图、海图。首先来讲解百度地图的引用。

方法：主要是利用tiledmapservicelayer加载切片地图，关于tiledmapservicelayer的说明大家可以去官网学习一下。

下面是加载百度地图和遥感影像的效果图。

下面是定义百度地图图层baidulayer的相关代码：

define(["dojo/_base/declare", "esri/layers/tiledmapservicelayer", "esri/geometry/extent", "esri/spatialreference", "esri/layers/tileinfo"],
    function (declare, tiledmapservicelayer, extent, spatialreference, tileinfo) {
        return declare(tiledmapservicelayer, {
            // 构造函数
            constructor: function (properties) {
                this.spatialreference = new spatialreference({
                    wkid: 102113
                });

                // 图层提供的起始显示范围以及整个图层的地理范围
                this.fullextent = new extent(-20037508.342787, -20037508.342787, 20037508.342787, 20037508.342787, this.spatialreference);
                this.initialextent = new extent(5916776.8, 1877209.3, 19242502.6, 7620381.8, this.spatialreference);
                // 图层提供的切片信息
                this.tileinfo = new tileinfo({
                    "rows": 256,
                    "cols": 256,
                    "compressionquality": 0,
                    "origin": {
                        "x": -20037508.342787,
                        "y": 20037508.342787
                    },
                    "spatialreference": {
                        "wkid": 102113
                    },
                    "lods": [
                        { "level": 0, "resolution": 156543.033928, "scale": 591657527.591555 },
                        { "level": 1, "resolution": 78271.5169639999, "scale": 295828763.795777 },
                        { "level": 2, "resolution": 39135.7584820001, "scale": 147914381.897889 },
                        { "level": 3, "resolution": 19567.8792409999, "scale": 73957190.948944 },
                        { "level": 4, "resolution": 9783.93962049996, "scale": 36978595.474472 },
                        { "level": 5, "resolution": 4891.96981024998, "scale": 18489297.737236 },
                        { "level": 6, "resolution": 2445.98490512499, "scale": 9244648.868618 },
                        { "level": 7, "resolution": 1222.99245256249, "scale": 4622324.434309 },
                        { "level": 8, "resolution": 611.49622628138, "scale": 2311162.217155 },
                        { "level": 9, "resolution": 305.748113140558, "scale": 1155581.108577 },
                        { "level": 10, "resolution": 152.874056570411, "scale": 577790.554289 },
                        { "level": 11, "resolution": 76.4370282850732, "scale": 288895.277144 },
                        { "level": 12, "resolution": 38.2185141425366, "scale": 144447.638572 },
                        { "level": 13, "resolution": 19.1092570712683, "scale": 72223.819286 },
                        { "level": 14, "resolution": 9.55462853563415, "scale": 36111.909643 },
                        { "level": 15, "resolution": 4.77731426794937, "scale": 18055.954822 },
                        { "level": 16, "resolution": 2.38865713397468, "scale": 9027.977411 },
                        { "level": 17, "resolution": 1.19432856685505, "scale": 4513.988705 },
                        { "level": 18, "resolution": 0.597164283559817, "scale": 2256.994353 },
                        { "level": 19, "resolution": 0.298582141647617, "scale": 1128.497176 }
                    ]
                });

                // 设置图层的loaded属性，并触发onload事件
                this.loaded = true;
                this.onload(this);
            },

            gettileurl: function (level, row, col) {
                var zoom = level - 1;
                var offsetx = math.pow(2, zoom);
                var offsety = offsetx - 1;
                var numx = col - offsetx;
                var numy = (-row) + offsety;
                zoom = level + 1;
                var num = (col + row) % 8 + 1;
                var url = "https://online1.map.bdimg.com/tile/?qt=tile&x=" + numx + "&y=" + numy + "&z=" + zoom + "&styles=pl";
                return url;
            }
        });
    }
)

加载百度地图图层的代码：

<script>
    var map;
    require([
        "esri/map",
        "src/baidulayer",
        "dojo/parser",
        "dojo/domready!"], 
    function(map, baidulayer, parser) {
        parser.parse();
        map = new map("map", {
            logo: false,
            center: [119.9, 40.7],
            zoom: 4
        });
        //加载百度地图图层
        var bdlayer = new baidulayer();
        map.addlayer(bdlayer);

     });
 </script>

源码下载：

源码包括百度地图和影像（加标注）的自定义文件(src/*.js)和加载文件（.html），arcgis api for javascript使用的是最新版本【3.23】。

其他在线地图的相关代码会后续更新，敬请持续关注。