10

我希望将我的应用程序从 OpenLayers 2 更新到 OpenLayers 3。

有没有人知道可以对此有所帮助的迁移指南（或类似的东西）？

4

2 回答 2

7

FWIW - 当我们将http://www.nufosmatic.com上的简单页面从 ol2迁移到 ol3 时，我们愿意做出贡献。问题看起来很棘手，但很多原因是 ol3 看起来比 ol2 好得多，示例看起来也有了很大改进，文档也好多了，但它们不同，如​​果你有终于习惯了ol2 docs。

命名空间已经改变，一些 API 调用的顺序必须由于一些语义差异而改变。这是一个头脑简单的一阶地图迁移。这个简单的练习花了大约一个小时，主要是由于上面提到的新文档混乱：

/*                                                                                         
  Very simple OpenLayers2 map                                                              
 */
var map, layer, center;

function init() {
    map = new OpenLayers.Map('map');
    layer = new OpenLayers.Layer.OSM("Simple OSM Map");
    map.addLayer(layer); // this must come before the following                            
    center = new OpenLayers.LonLat(-71.147, 42.472)
        .transform(
                   new OpenLayers.Projection("EPSG:4326"),
                   map.getProjectionObject()
                   );
    map.setCenter(center, 5);
}

/*                                                                                         
  Very simple OpenLayers3 map                                                              
 */                                                                                        
var map, layer, center;                                                                    

function init(){                                                                           
    map = new ol.Map({                                                                     
            target:'map',                                                                  
            renderer:'canvas',                                                             
            view: new ol.View({                                                            
                    projection: 'EPSG:900913',                                             
                })                                                                         
        });                                                                                
    layer = new ol.layer.Tile({                                                            
            source: new ol.source.OSM()                                                    
        });                                                                                
    map.addLayer(layer); // this can actually come up last                                 
    center = new ol.proj.transform([-71.147, 42.472],                                      
                                   'EPSG:4326', // essentially LonLat                      
                                   map.getView().getProjection());                         
    map.getView().setCenter(center);                                                       
    map.getView().setZoom(5);                                                              
}

顶层 html 在标记中发生了一些变化，其中包含一些包装器更改（以上位于 js/main.js 文件中）：

> diff -btw ../*[23]/index.html
7c7
<         <script src='OpenLayers-2.13.1/OpenLayers.js'></script>
---
> <script src='v3.10.1/build/ol.js'></script>
11c11
<         <link rel='stylesheet' href='OpenLayers-2.13.1/theme/default/style.css'>
---
> <link rel='stylesheet' href='v3.10.1/css/ol.css'>
于 2015-10-21T18:44:42.527 回答
1

OpenLayers3 has a new design and concepts and modelled different, so there is no direct translation.

I think the best option is starting reading the current available books so you can learn it and evaluate yourself:

Take into account OL3 has many improvements over OL2 but not all the features of OL2 are implemented in OL3 yet.

于 2015-02-05T20:44:30.510 回答