ArcGis For Flex 之 QueryTask地理坐标展现【原创】
本功能仿照Google Map分类搜索做的，可以看Google效果：http://ditu.google.cn/maps?hl=zh-CN&tab=wl
现在说说从查询到画出标注的具体经过，贴代码，注释写的也不多，有兴趣深究的可以到官方API查询
下面的代码是查询，并画出标注：
/***************************
* 地标-地理定位数字化展现
***************************/
public function ReaderLandMark(landMarkSearchWhere:String):void
{
clearAllGraphicsLayers();
queryUrl=sLandMarkUrl + "/0";
query.where=landMarkSearchWhere;
query.outFields=new Array('NID', 'CNAME', 'CTYPE', 'CPROVINCE', 'CCITIES', 'CCOUNTY', 'CROAD', 'CHOUSENUM', 'NLON', 'NLAT');
queryTaskGsm.execute(query, new AsyncResponder(onResult, onFault));
function onResult(featureSet:FeatureSet, token:Object=null):void
{
glLandMark.clear(); //清空图层
var displayFieldName:String=featureSet.displayFieldName;
var count:int=1;
var arrColl:ArrayCollection;
var txtSysmbol:TextSymbol;
var compSysmbol:CompositeSymbol;
var tFormat:TextFormat=new TextFormat();
tFormat.bold=false;
tFormat.size=10;
tFormat.font="Verdana";
for each (var myGraphic:Graphic in featureSet.features)
{
arrColl=new ArrayCollection();
txtSysmbol=new TextSymbol(count.toString(), null, 0x070707);
txtSysmbol.textFormat=tFormat;
arrColl.addItem(new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE, 20, 0xFE776B));
arrColl.addItem(txtSysmbol);
compSysmbol=new CompositeSymbol();
compSysmbol.symbols=arrColl;
myGraphic.toolTip=myGraphic.attributes.CNAME;
myGraphic.symbol=compSysmbol;
glLandMark.add(myGraphic);
count++;
}
}
function onFault(info:Object, token:Object=null):void
{
Alert.show(info.toString(), "Query Problem");
}
}
然后是datagrid的行单击，实现标注的高亮特效，还是比较炫的哦，代码如下：
//datagrid 单击
protected function dgClick(e:MouseEvent):void
{
var itemR:DataGridItemRenderer=e.target as DataGridItemRenderer;
if (!itemR)
{
return;
}
var pt:MapPoint=new MapPoint(itemR.data.NLON, itemR.data.NLAT);
if (!parentApplication.Map.extent.contains(pt))
{
parentApplication.Map.centerAt(pt);
}
var pictureMarker:PictureMarkerSymbol=new PictureMarkerSymbol("assets/flash/Red_glow.swf", 40, 40, -11, 10);
var myGraphic:Graphic=new Graphic(pt, pictureMarker);
myGraphic.name="ghTopicByLandMark";
var removeGraphic:Graphic=parentApplication.glLandMark.getChildByName("ghTopicByLandMark");
if (removeGraphic)
{
parentApplication.glLandMark.remove(removeGraphic);
}
parentApplication.glLandMark.add(myGraphic);
}
OK,完成了。。。。。。。。。。。。有错误和有待优化的地方请留言指正！
