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:
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<mx:ToggleButtonBar iconField="icon" horizontalCenter="-47" verticalCenter="-151" itemClick="itemClickHandler(event)" toggleOnClick="true">
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<mx:dataProvider>
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<mx:Array>
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<mx:Object icon="{point}" />
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<mx:Object icon="{point2}" />
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<mx:Object icon="{polyline3}" />
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<mx:Object icon="{polyline}" />
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<mx:Object icon="{polyline2}" />
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<mx:Object icon="{polygon}" />
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<mx:Object icon="{polygon2}" />
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<mx:Object icon="{polygon3}" />
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</mx:Array>
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</mx:dataProvider>
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</mx:ToggleButtonBar>
4.上面的代码中icon对应的图标定义在mx:Script中如下:
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//图标图片
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[Bindable]
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[Embed(source="assets/point.gif")]
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public var point:Class;
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[Bindable]
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[Embed(source="assets/point2.gif")]
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public var point2:Class;
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[Bindable]
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[Embed(source="assets/polyline.gif")]
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public var polyline:Class;
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[Bindable]
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[Embed(source="assets/polyline3.gif")]
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public var polyline3:Class;
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[Bindable]
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[Embed(source="assets/polyline2.gif")]
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public var polyline2:Class;
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[Bindable]
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[Embed(source="assets/polygon.gif")]
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public var polygon:Class;
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[Bindable]
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[Embed(source="assets/polygon2.gif")]
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public var polygon2:Class;
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[Bindable]
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[Embed(source="assets/polygon3.gif")]
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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:![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<esri:Map id="myMap" extent="{allMap}" logoVisible="false">
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<esri:ArcGISTiledMapServiceLayer url="http://server.arcgisonline.com/ArcGIS/rest/services/NPS_Physical_World_2D/MapServer" />
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<esri:GraphicsLayer id="myGraphicsLayer"/>
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</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:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<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 。![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
8.接下来定义一下画出来的点、线、面的显示样式,代码如下:
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<esri:SimpleLineSymbol id="sls" style="solid" color="0xFF0000" width="2" alpha="1"/>
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<esri:SimpleMarkerSymbol id="sms" style="square" color="0xFF0000" size="10" />
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<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。![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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:
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import mx.events.ItemClickEvent;
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private function itemClickHandler(event:ItemClickEvent):void
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{
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//设置点样式
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drawToolbar.markerSymbol=sms;
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//设置线样式
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drawToolbar.lineSymbol=sls;
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//设置面样式
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drawToolbar.fillSymbol=sfs;
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//更加按钮的index值设置不同的绘制操作
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switch(event.index)
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{
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case 0:
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{
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drawToolbar.activate(Draw.MAPPOINT);
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break;
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}
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case 1:
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{
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drawToolbar.activate(Draw.MULTIPOINT);
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break;
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}
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case 2:
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{
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drawToolbar.activate(Draw.LINE);
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break;
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}
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case 3:
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{
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drawToolbar.activate(Draw.POLYLINE);
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break;
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}
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case 4:
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{
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drawToolbar.activate(Draw.FREEHAND_POLYLINE);
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break;
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}
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case 5:
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{
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drawToolbar.activate(Draw.POLYGON);
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break;
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}
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case 6:
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{
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drawToolbar.activate(Draw.FREEHAND_POLYGON);
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break;
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}
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case 7:
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{
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drawToolbar.activate(Draw.EXTENT);
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break;
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}
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}
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}
11.很简单就完成了这些功能可以运行查看效果。
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