ArcGIS.Server.9.3和ArcGIS API for Flex实现GraphicsLayer上画点、线、面(五)

混江龙づ霸主 提交于 2020-01-20 04:48:30
目的:
1.ArcGIS API for Flex实现GraphicsLayer上画点、线、面
准备工作:
1.这次地图数据就用Esri提供的http://server.arcgisonline.com/ArcGIS/rest/services/NPS_Physical_World_2D/MapServer
完成后的效果图:


开始:
1.启动Flex Builder3新建工程以及引入ArcGIS API for Flex library的开发包
2.新建DrawTool.mxml页面,然后在页面上添加esri:Map控件设置esri:ArcGISTiledMapServiceLayer等。
3.和上一篇一样仍旧用mx:ToggleButtonBar来实现功能按钮,mx:ToggleButtonBar需要包含6个按钮分别实现6种不一样的操作,具体代码如下:  1<mx:ToggleButtonBar iconField="icon"  horizontalCenter="-47" verticalCenter="-151" itemClick="itemClickHandler(event)" toggleOnClick="true">
 2        <mx:dataProvider>
 3        <mx:Array>
 4        <mx:Object icon="{point}" />
 5        <mx:Object icon="{point2}" />
 6        <mx:Object icon="{polyline3}" />
 7        <mx:Object icon="{polyline}" />
 8        <mx:Object icon="{polyline2}" />
 9        <mx:Object icon="{polygon}" />
10        <mx:Object icon="{polygon2}" />
11        <mx:Object icon="{polygon3}" />
12        </mx:Array>
13        </mx:dataProvider>
14        </mx:ToggleButtonBar> 4.上面的代码中icon对应的图标定义在mx:Script中如下:  1//图标图片
 2            [Bindable] 
 3            [Embed(source="assets/point.gif")]
 4            public var point:Class; 
 5            
 6            [Bindable] 
 7            [Embed(source="assets/point2.gif")]
 8            public var point2:Class; 
 9            
10            [Bindable] 
11            [Embed(source="assets/polyline.gif")]
12            public var polyline:Class; 
13            
14            [Bindable] 
15            [Embed(source="assets/polyline3.gif")]
16            public var polyline3:Class; 
17            
18            [Bindable] 
19            [Embed(source="assets/polyline2.gif")]
20            public var polyline2:Class; 
21            
22            [Bindable] 
23            [Embed(source="assets/polygon.gif")]
24            public var polygon:Class; 
25            
26            [Bindable] 
27            [Embed(source="assets/polygon2.gif")]
28            public var polygon2:Class; 
29            
30            [Bindable] 
31            [Embed(source="assets/polygon3.gif")]
32            public var polygon3:Class;  5.现在要实现在地图上画点、线等就需要esri:GraphicsLayer 的功能,实际上点、线、面都是画在GraphicsLayer的所以需要在Map控件中添加:
1<esri:Map id="myMap" extent="{allMap}" logoVisible="false">
2        <esri:ArcGISTiledMapServiceLayer url="http://server.arcgisonline.com/ArcGIS/rest/services/NPS_Physical_World_2D/MapServer" />
3        <esri:GraphicsLayer id="myGraphicsLayer"/> 
4    </esri:Map> 6.要进行绘制功能esri已经提供了esri:Draw这个控件能很方便的实现基本图形的绘制,使用代码如下: 1<esri:Draw id="drawToolbar" map="{myMap}" graphicsLayer="{myGraphicsLayer}" /> 7.esri:Draw有2个属性一个是要进行画图操作的地图控件,一个是画图的容器GraphicsLayer
8.接下来定义一下画出来的点、线、面的显示样式,代码如下: 1<esri:SimpleLineSymbol id="sls" style="solid" color="0xFF0000" width="2" alpha="1"/>
2<esri:SimpleMarkerSymbol id="sms" style="square" color="0xFF0000" size="10" />
3<esri:SimpleFillSymbol id="sfs" style="solid" color="0xFF0000" alpha="0.5"/> 9.上面的sls为线的显示样式;sms为点的显示样式;sfs为面的显示样式,关于样式的定义可以查询一下帮助了有很多的样式等可以实现。
10.最后就是编写功能代码在上面的ToggleButtonBar控件中已经给它添加了一个itemClick="itemClickHandler(event)",这里就是编写itemClickHandler(event)这个方法的代码:  1import mx.events.ItemClickEvent;
 2private function itemClickHandler(event:ItemClickEvent):void
 3            {
 4                //设置点样式
 5                drawToolbar.markerSymbol=sms;
 6                //设置线样式
 7                drawToolbar.lineSymbol=sls;
 8                //设置面样式
 9                drawToolbar.fillSymbol=sfs;
10                //更加按钮的index值设置不同的绘制操作
11                switch(event.index)
12                {
13                    case 0:
14                    {
15                        drawToolbar.activate(Draw.MAPPOINT);
16                        break;
17                    }

18                    case 1:
19                    {
20                        drawToolbar.activate(Draw.MULTIPOINT);
21                        break;
22                    }

23                    case 2:
24                    {
25                        drawToolbar.activate(Draw.LINE);
26                        break;
27                    }

28                    case 3:
29                    {
30                        drawToolbar.activate(Draw.POLYLINE);
31                        break;
32                    }

33                    case 4:
34                    {
35                        drawToolbar.activate(Draw.FREEHAND_POLYLINE);
36                        break;
37                    }

38                    case 5:
39                    {
40                        drawToolbar.activate(Draw.POLYGON);
41                        break;
42                    }

43                    case 6:
44                    {
45                        drawToolbar.activate(Draw.FREEHAND_POLYGON);
46                        break;
47                    }

48                    case 7:
49                    {
50                        drawToolbar.activate(Draw.EXTENT);
51                        break;
52                    }

53                }

54            }
11.很简单就完成了这些功能可以运行查看效果。

标签
易学教程内所有资源均来自网络或用户发布的内容,如有违反法律规定的内容欢迎反馈
该文章没有解决你所遇到的问题?点击提问,说说你的问题,让更多的人一起探讨吧!