How to zoom further?

PaulFrey

Does anyone know of a way to allow a user to be able to zoom down further?  The default zoom extents are certainly far enough for zooming out, but when zooming in you can only go as far as making ESRI's street basemap layer dissapear.  I have a web service running on a flex viewer that deals with villages that have very small parcels, its frustrating to not be able to zoom in close enough to them. 

In short, does anybody know a way to allow a user to zoom in further?

Thank you

-Paul

ReneRubalcava

I haven't really thoroughly tested this, but it's working for me so far.

// minimum scale of map
// taken from http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer
private const SCALE:Number = 1128.497176;
private const LEVEL:int = 10;
private var _lods:Array;

// add this event listener somewhere
map.addEventListener(ExtentEvent.EXTENT_CHANGE, onMapExtentChange_handler);

protected function onMapExtentChange_handler(event:ExtentEvent):void
{
 if (map.level)
 {
  if (!map.lods && map.scale > SCALE)
  {
   map.lods = _lods;
   imageServiceLayer.visible = true;
  }
  else if (map.lods && LEVEL === map.level)
  {
   // somewhere in here
   // you will need to turn off any TiledMapServiceLayer
   // that has a minimum scale, like the World_Imagery service
   // if not, this function will just get stuck in a loop
   imageServiceLayer.visible = false;
   _lods = map.lods;
   map.lods = null;
   // need to subtract a minor amout 
   // because map.scale
   // is a number and precision issues
   // were throwing off my map.scale > SCALE
   // comparison above
   map.scale = SCALE - 0.1;
  }
 }
}

In my case, I adjust the lods to only have 10 levels, but you'll want to use however many levels are in your app.
You could probably just assign it from when the Map first loads and grab the map.lods.length and use that value through the rest of your application.

I have been putting off really working on this because the functionality was broken in 2.X up until 2.1 or 2.2 I think, and I just have not gotten around to working it back in.