02 建立一個三維地圖
阿新 • • 發佈:2018-10-31
三維地圖的建立跟上文中的建立二維地圖差不太多,只是所使用的地圖視角不同而已,下面是最終效果圖:
接下來我們看看具體的實現過程:
1 建立基本的HTML頁面結構,建立div,然後設定基本樣式,如下:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no"> <title>Intro to SceneView - Create a 3D map</title> <style> html, body, #viewDiv { padding: 0; margin: 0; height: 100%; width: 100%; } </style> </head> <body> <div id="viewDiv"></div> </body> </html>
2 引入所需的開發包,在此處也只是需要一個樣式檔案和基礎的js檔案,如下:
<link rel="stylesheet" href="https://js.arcgis.com/4.9/esri/css/main.css">
<script src="https://js.arcgis.com/4.9/"></script>
3 載入所需的模組,然後例項化地圖:
<script> require([ "esri/Map", "esri/views/SceneView" ], function(Map, SceneView){ var map = new Map({ basemap: "osm", ground: "world-elevation" }); }); </script>
4 建立地圖視角,注意,在此處的地圖視角不再是MapView,而是SceneView,所以大家一定要注意:
var view = new SceneView({
container: "viewDiv",
map: map, // 繫結地圖
scale: 30000000, // 設定比例尺 1:30,000,000
center: [104.071469,30.662036] // 視角中心
});
5 至此,一個三維地圖建立完成,完整程式碼如下:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no"> <title>Intro to SceneView - Create a 3D map</title> <style> html, body, #viewDiv { padding: 0; margin: 0; height: 100%; width: 100%; } </style> <link rel="stylesheet" href="https://js.arcgis.com/4.9/esri/css/main.css"> <script src="https://js.arcgis.com/4.9/"></script> <script> require([ "esri/Map", "esri/views/SceneView" ], function(Map, SceneView){ var map = new Map({ basemap: "osm", ground: "world-elevation" }); var view = new SceneView({ container: "viewDiv", map: map, // 繫結地圖 scale: 30000000, // 設定比例尺 1:30,000,000 center: [104.071469,30.662036] // 視角中心 }); }); </script> </head> <body> <div id="viewDiv"></div> </body> </html>