openlayers中的自定制工具栏，包含画点、线、面

先是在projectquantan-master这个项目中有一个EditingPanel这个工具条，也挺好的，功能挺全的，但是有一点就是只有画多边形的一个按钮，没有point和path俩个的，所以就想自己去加一个。

然后就发现统一的drawfeature的样式（olControlDrawFeatureItemInactive），没有分为point、path和polygon的，然后就去源代码中找控制这个样式点代码去修改他，但是始终没有找到，只能作罢。

又去网上搜索找到了openlayers自带的一个control（new OpenLayers.Control.EditingToolbar(vector_layer)，这个上面有四个按钮，point、path、polygon和pan，还好，正打算用它和之前的editingpanel一起做一个东西呢，

发现了这个  var controls = [

new OpenLayers.Control.DrawFeature(layer, OpenLayers.Handler.Polygon, {'displayClass': 'olControlDrawFeaturePolygon'}),

new OpenLayers.Control.DrawFeature(layer, OpenLayers.Handler.Path, {'displayClass': 'olControlDrawFeaturePath'}),

new OpenLayers.Control.DrawFeature(layer, OpenLayers.Handler.Point, {'displayClass': 'olControlDrawFeaturePoint'})

];就是后面的class可以自己加，

就尝试着在EditingPanel中加一个同样的，没想到就成功了。真是踏破铁鞋无觅处啊。最后代码：

 1  1 /**
 2  2  * Provide a custom editing panel for editing a vec layer.
 3  3  * Not meant to be general purpose.
 4  4  */
 5  5 var EditingPanel = OpenLayers.Class(OpenLayers.Control.Panel, {
 6  6
 7  7     initialize: function(layer) {
 8  8
 9  9         OpenLayers.Control.Panel.prototype.initialize.apply(this, [{}]);
10 10
11 11         var navigate = new OpenLayers.Control.Navigation({
12 12             title: "Pan Map"
13 13         });
14 14
15 15
16 16         var drawFeaturePoint = new OpenLayers.Control.DrawFeature(
17 17             layer, OpenLayers.Handler.Point, {
18 18                 title: "画点",
19 19                 handlerOptions: {multi: true},
20 20                 displayClass: 'olControlDrawFeaturePoint'
21 21             }
22 22         );
23 23
24 24         var drawFeaturePath= new OpenLayers.Control.DrawFeature(
25 25             layer, OpenLayers.Handler.Path, {
26 26                 title: "画线",
27 27                 handlerOptions: {multi: true},
28 28                 displayClass: 'olControlDrawFeaturePath'
29 29             }
30 30         );
31 31         var drawFeaturePolygon = new OpenLayers.Control.DrawFeature(
32 32             layer, OpenLayers.Handler.Polygon, {
33 33                 title: "画多边形",
34 34                 handlerOptions: {multi: true},
35 35                 displayClass: 'olControlDrawFeaturePolygon'
36 36             }
37 37         );
38 38
39 39         var edit = new OpenLayers.Control.ModifyFeature(layer, {
40 40             title: "修改要素"
41 41         });
42 42
43 43         var del = new DeleteFeature(layer, {title: "删除要素"});
44 44
45 45         var save = new OpenLayers.Control.Button({
46 46             title: "保存更改",
47 47             trigger: function() {
48 48                 if(edit.feature) {
49 49                     edit.selectControl.unselectAll();
50 50                 }
51 51                 // fails if no save strategy
52 52                 var strat = OpenLayers.Array.filter(
53 53                     layer.strategies,
54 54                     function(s) {
55 55                         return s instanceof OpenLayers.Strategy.Save;
56 56                     }
57 57                 )[0];
58 58                 strat.save();
59 59             },
60 60             displayClass: "olControlSaveFeatures"
61 61         });
62 62
63 63         this.defaultControl = navigate;
64 64         //this.addControls([save, del, edit,drawFeaturePoint,drawFeaturePath,drawFeaturePolygon, navigate]);
65 65         this.addControls([navigate,drawFeaturePoint,drawFeaturePath,drawFeaturePolygon, edit, del,save]);
66 66
67 67     },
68 68
69 69     CLASS_NAME: "EditingPanel"
70 70 });

上面一个简略的问题解决的流程，只要有耐心问题自会得到解决的。千万不要自己放弃，打心底里相信问题能够得到解决。

要相信只要去坚持，问题总会解决，当然坚持不是盲目的坚持，不断的寻找解决问题的方法，问题总能在不经意间得到完美的解决。只是有时候过程有点慢吧，不过刚开始没经验嘛，慢一点多积累经验都一样，后来会越来越快的，只能说你对事物的认知在慢慢的加深，问题就会慢慢得到来解决。