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Geometry Server Question

FrankRoberts

In a different post I figured out how to use the Geometry Server to project a point, see:

http://forums.arcgis.com/threads/14793-UTM-or-State-Plane-to-Decimal-Degrees

However, I'm still left with a question. My question is there anyway to avoid adding the Declarations section at the end (i.e. just define the geometryService info in the body of the ActionScript function)??

This is what I'm currently adding:

<fx:Declarations>
<esri:GeometryService id="geometryService"
concurrency="last"
fault="onFault(event)"
projectComplete="projectCompleteHandler(event)"
url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer"/>
</fx:Declarations>

Thanks

Frank

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azgis

Robert,

Yes there must be something else at play, and it may be that this can only work within the mxml component. I am trying to do this in an action script class, and it never sends to the geometry service. So I guess I may create a new post to see if it is possible to use a geometry service in an action script class, i.e. not in mxml.

Thanks again for the help.

Jim Faron
Austin Independent School District

rscheitlin

Jim,

You have to have something wrong else where then. Here is a simple app that demos all this working:

Project_Test_App.txt.zip

azgis

Robert,

I input the Spatial Reference, and that will definitely fix the error when I input the url send to the geometry server: it will reproject there as expected. But the action script never sends to the geometry server, i.e. when I debug it will skip through the function pResult. In other words I can't seem to get the action script to complete the request, thus not even a fault will return (i.e when I previously forgot the input spatial reference).

Here is the code:

public function convertToPoint(x:Number, y:Number, bool:Boolean):Point
  {   
   var _pointObject:MapPoint = new MapPoint();
   _pointObject.spatialReference = new SpatialReference(4326);
   _pointObject.x = x;
   _pointObject.y = y;
   
   if((bool) && (!isNaN(x)) && (!isNaN(y)))
   {
    //_pointObject = WebMercatorUtil.geographicToWebMercator(_pointObject) as MapPoint;
    var geomServ:GeometryService = new GeometryService("https://my-imap.austinisd.org/arcgis/rest/services/Utilities/Geometry/GeometryServer");
    //geomServ.addEventListener(GeometryServiceEvent.PROJECT_COMPLETE,pResult);
    const projParams:ProjectParameters = new ProjectParameters();
    projParams.geometries = [_pointObject ];
    var outSR:SpatialReference = new SpatialReference(2277);
    projParams.outSpatialReference = outSR;
    geomServ.project(projParams, 
     new AsyncResponder(
      function pResult(item:Object, token:Object = null):void{
       var pt:MapPoint = (item as Array)[0] as MapPoint;
       _pointObject.x = pt.x;
       _pointObject.y = pt.y;
      },
      function pFault(fault:Fault, token:Object = null):void{
       Alert.show("Error: " + fault.faultString, "Error code: " + fault.faultCode);
      }
     )
    );
    
   }

Here is the url that would be sent:

https://my-imap.austinisd.org/arcgis/rest/services/Utilities/Geometry/GeometryServer/project?outSR=2277&amp;f=json&amp;geometries={"geometryType":"esriGeometryPoint","geometries":[{"x":-97.75055769,"y":30.22752472}]}&amp;inSR=4326

The return from the geometry server: {"geometries":[{"x":3112207.5068722428,"y":10055955.767591864}]}

So I wonder if this is an action script issue, since all of this would work easily in mxml.

Thanks,

Jim Faron
Austin Independent School District

rscheitlin

Jim,

I still don't see in your code where you are specifying that the spatial reference of the MapPoint is (originally) before you attempt to reproject it. How can the geometry service know how to re-project if it does not know what spatial reference it is in to begin with?

azgis

Robert,

Here is the code I am using:

public function convertToPoint(x:Number, y:Number, bool:Boolean):Point
  {   
   var _pointObject:MapPoint = new MapPoint();
   _pointObject.x = x;
   _pointObject.y = y;
   
   if((bool) && (!isNaN(x)) && (!isNaN(y)))
   {
    //_pointObject = WebMercatorUtil.geographicToWebMercator(_pointObject) as MapPoint;
    var geomServ:GeometryService = new GeometryService("https://my-imap.austinisd.org/arcgis/rest/services/Utilities/Geometry/GeometryServer");
    //geomServ.addEventListener(GeometryServiceEvent.PROJECT_COMPLETE,pResult);
    const projParams:ProjectParameters = new ProjectParameters();
    projParams.geometries = [_pointObject as MapPoint ];
    var outSR:SpatialReference = new SpatialReference(2277);
    projParams.outSpatialReference = outSR;
    geomServ.project(projParams, 
     new AsyncResponder(
      function pResult(item:Object, token:Object = null):void{
       var pt:MapPoint = (item as Array)[0] as MapPoint;
       _pointObject.x = pt.x;
       _pointObject.y = pt.y;
      },
      function pFault(fault:Fault, token:Object = null):void{
       Alert.show("Error: " + fault.faultString, "Error code: " + fault.faultCode);
      }
     )
    );
    
   }

The url that forms (from debug) is

http://mapaisd/arcgis/rest/services/Utilities/Geometry/GeometryServer/project?outSR=2277&amp;f=json&amp;geometries={"geometryType":"esriGeometryPoint","geometries":[{"y":30.49213059,"x":-97.64269802}]}

This returns {"error":{"code":400,"message":"Unable to complete operation.","details":[]}} if I input it in the browser.

Thanks,

Jim Faron
Austin Independent School District

rscheitlin

Jim,

I got that code to work just fine. Are you setting the spatial reference of the _pointObject before you attempt to project it?

azgis

Robert,

That does formulate the send request to the geometry service as expected, but it does not actually send it, at least as I can tell from monitoring it with fiddler. I stepped through this in debug and it forms the url request to the geometry server. But the item:Object never gets a value returned from the geometry server, and it basically skips through both the pResult and the pFault functions. Seems to be related to the problem regarding dispatching events that is referred to in the adobe blog post I linked in my first post.

Thanks,

Jim Faron
Austin Independent School District

rscheitlin

Jim,

Try this:

geomServ.project(projParams, 
                        new AsyncResponder(
                            function pResult(item:Object, token:Object = null):void{
                                var pt:MapPoint = (item as Array)[0] as MapPoint;
                                _pointObject.x = pt.x;
                                _pointObject.y = pt.y;
                            },
                            function pFault(fault:Fault, token:Object = null):void{
                                Alert.show("Error: " + fault.faultString, "Error code: " + fault.faultCode);
                            }
                        )
                    );

azgis

I have used something similar in mxml, but I am trying to do a reprojection in an action script class, and the event listener will not fire within the function. Here is the orginal code:

public function convertToPoint(x:Number, y:Number, bool:Boolean):Point
  {   
   var _pointObject:MapPoint = new MapPoint();
   _pointObject.x = x;
   _pointObject.y = y;
   
   if(bool)
   {
    _pointObject = WebMercatorUtil.geographicToWebMercator(_pointObject) as MapPoint;
   }
   else
   {
    _pointObject = WebMercatorUtil.webMercatorToGeographic(_pointObject) as MapPoint;
   }   
   
   return new Point(_pointObject.x, _pointObject.y);
  }

I have tried creating a class to project the _pointObject to state plane, but first I tried something like this (this is a simplified version of what I tried, but the essence is that I can't get the event listener to dispatch the result function) I had the same issue in the class I created :

public function convertToPoint(x:Number, y:Number, bool:Boolean):Point
  {   
   var _pointObject:MapPoint = new MapPoint();
   _pointObject.x = x;
   _pointObject.y = y;
   
   if(bool)
   {
    //_pointObject = WebMercatorUtil.geographicToWebMercator(_pointObject) as MapPoint;
    var geomServ:GeometryService = new GeometryService("http://myserver/arcgis/rest/services/Utilities/Geometry/GeometryServer");
    geomServ.addEventListener(GeometryServiceEvent.PROJECT_COMPLETE,pResult);
    const projParams:ProjectParameters = new ProjectParameters();
    projParams.geometries = [_pointObject as MapPoint ];
    var outSR:SpatialReference = new SpatialReference(2277);
    projParams.outSpatialReference = outSR;
    geomServ.project(projParams);
    function pResult(event:GeometryServiceEvent):void{
     var pt:MapPoint = (event.result as Array)[0]as MapPoint;
     _pointObject.x = pt.x;
     _pointObject.y = pt.y;
   }

The code will work up to the geomServ.project(projParams) function, but the project comple function (pResult) will not fire up to complete the projection. I believe that there is an inherent issue with event listeners in action script, and I may be out of luck: I just wanted to bounce this off more experienced programmers. As I implied in my first post, it would be fantastic if we had a way to do something like this since many folks are either stuck with using state plane, or choose to for other reasons. By the time this data gets back to the mxml, it is buried in a complex graphic provider of a graphics layer, making re-projection in mxml a very difficult or unlikely prospect. The idea is to get to this data before it gets loaded into that graphicprovider.

Thanks,

Jim Faron
Austin Independent School District

FrankRoberts

Thanks to Robert's help above I did get my code working in Action Script to call the Geometry services. The following is what I did:


private function mouseClickHandler(event:MouseEvent):void
            {
                const frmapPoint:MapPoint = map.toMapFromStage(event.stageX, event.stageY);
                var latlong:MapPoint;
                var wkidString:String = frmapPoint.spatialReference.wkid.toString();
                //Alert.show("Spatial Ref for map: " + frmapPoint.spatialReference.wkid.toString());
                if ( wkidString == "102100")
                {
                    latlong = WebMercatorUtil.webMercatorToGeographic(frmapPoint) as MapPoint;
                    frLat = latlong.y.toFixed(6);
                    frLong = latlong.x.toFixed(6);
                    displayForm(frLat, frLong);
                }
                else if ( wkidString == "3857")
                {
                    latlong = WebMercatorUtil.webMercatorToGeographic(frmapPoint) as MapPoint;
                    frLat = latlong.y.toFixed(6);
                    frLong = latlong.x.toFixed(6);
                    displayForm(frLat, frLong);
                }
                else if ( wkidString == "4326")
                {
                    latlong = map.toMapFromStage(event.stageX, event.stageY);
                    frLat = latlong.y.toFixed(6);
                    frLong = latlong.x.toFixed(6);
                    displayForm(frLat, frLong);
                }
                else
                {
                    //Project using geometry service
                    var outSR:SpatialReference = new SpatialReference(4326);
                    // var inSR:SpatialReference = new SpatialReference(102100);
                    //geometryService.project([ frmapPoint as Geometry ], outSR);
                    // Changed for 3.0 API
                    const projectParameters:ProjectParameters = new ProjectParameters;
                    projectParameters.geometries = [ frmapPoint as Geometry ];
                    projectParameters.outSpatialReference = outSR;
                    geometryService.project(projectParameters);
                }
                
                var graphic:Graphic = new Graphic();    
                var mapPoint2:MapPoint = frmapPoint;
                mapPoint2.spatialReference = map.spatialReference;                
                graphic.geometry = mapPoint2;                
                graphicsLayer.clear();                
                graphicsLayer.add(graphic);
            }
                        
            private function projectCompleteHandler(event:GeometryServiceEvent):void
            {
                try
                {
                    // Note: As of version 2.0, GeometryService returns geometries (instead of graphics)
                    var pt:MapPoint = (event.result as Array)[0]as MapPoint;                    
                    //Alert.show(pt.x + ", " + pt.y);
                    displayForm(pt.y.toString(),pt.x.toString());
                }
                catch (error:Error)
                {
                    Alert.show(error.toString());
                }
            }

Not sure if it helps or not, but maybe it provides you a little more then what you started with!

azgis

Resurrecting this old post, due to my desire to use a geometry service in action script. The problem is that the listener event will not dispatch the geometry service project_complete function, i.e. "pResult". This post describes the problem of dispatching an event in action script:http://blogs.adobe.com/steampowered/2011/05/dispatching-events-from-an-actionscript-class.html

Just wondering if anyone has succeeded to use a geometry service in action script. I'm trying to modify a function to project to State Plane that currently uses the WebMercatorUtil.

Also found this for Silverlight that auto-reprojects grahic layers, something that relates to my issue, in that I am stuck with trying to use a State Plane projected map with a graphics layer that is produced by a complex process: http://blogs2.esri.com/esri/arcgis/2011/02/13/auto-reprojecting-graphics-layers/

Thanks,

Jim Faron
Austin Independent School District

rscheitlin

Frank,

Here is how you do it in action script.

var geomServ:GeometryService = new GeometryService("http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");
                    geomServ.addEventListener(GeometryServiceEvent.PROJECT_COMPLETE,pResult);
function pResult(event:GeometryServiceEvent):void{
          var pt:MapPoint = (event.result as Array)[0]as MapPoint;
          map.centerAt(pt);
          map.cursorManager.removeBusyCursor();
         }

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