topic Re: How to use extent.intersects correctly? in ArcGIS API for Flex Questions

How to use extent.intersects correctly?

DavidBoiano — Fri, 28 Jun 2013 14:35:41 GMT

Can anyone please help explain to me how to use extent.intersects correctly? I understand the input parameter needs to be a geometry type and it will return a boolean value. I am ultimately trying to check if each individual feature in my featureLayer exists in the current extent (kind of like the Attribute Table) and if the feature exists, I then would like to export/copy that feature to another array to populate a data grid. One of my many attempts is:

//Code for Data Download button       public function dataDownload():void    {     var featureSet:FeatureSet = new FeatureSet(ArrayCollection(myFeatureLayer.graphicProvider).toArray());     var records:Array = featureSet.attributes;     var exportSet:Array = new Array();     for (var i:int=0; i<records.length; i++){      if (myMap.extent.intersects(records.geometry))      {       exportSet.push(records);      }     }     ssoDataGrid.dataProvider = new ArrayList(exportSet);    }

I have checked the records array and it is being correctly populated by my feature layer. I am struggling with writing the correct loop to loop through the features, but more importantly I don't think my "if statement" has ever returned "True" because the exportSet array is always empty. I think I am messing up by not looping through the graphicProvider to access the geometry, but I don't know how to loop through that unless it's an array...

I am still fairly new to flex and OO programming, so any suggestions or reference would be greatly appreciated!

Thank you very much.

David

Re: How to use extent.intersects correctly?

SarthakDatt — Fri, 28 Jun 2013 16:15:21 GMT

Hi David,

You can simply do something like this:

public function dataDownload():void    {     var featureCollection:ArrayCollection = myFeatureLayer.graphicProvider as ArrayCollection;     var exportSet:Array = [];      for (var i:int=0; i < featureCollection.length; i++){                                         var graphic:Graphic = featureCollection.getItemAt(i) as Graphic;      if (myMap.extent.intersects(graphic.geometry))      {            exportSet.push(graphic);      }     }                                                                OR                                  for each (var graphic:Graphic in featureCollection){                                                     if (myMap.extent.intersects(graphic.geometry))      {            exportSet.push(graphic);      }     }      ssoDataGrid.dataProvider = new ArrayList(exportSet);    }

Re: How to use extent.intersects correctly?

DavidBoiano — Fri, 28 Jun 2013 16:27:06 GMT

Sarthak,

THANK YOU! That works exactly as I needed it to. All I had to do was add

exportSet.push(graphic.attributes);

and the array was populated with everything correctly. Thanks again very much!

David