topic Re: Distance between 2 Points in ArcGIS API for Flex Questions

Distance between 2 Points

TonyCollins — Tue, 12 Oct 2010 13:25:17 GMT

Quite simply, if I have two MapPoints how would I measure the distance between them?

I tried to create a polyline using these points and then call the lengths method on geometry service but the results array is allways empty.

Re: Distance between 2 Points

RobertScheitlin__GISP — Tue, 12 Oct 2010 13:37:00 GMT

Tony,

Look at this sample.

http://help.arcgis.com/en/webapi/flex/samples/index.html?sample=MeasureDistance

Re: Distance between 2 Points

TonyCollins — Tue, 12 Oct 2010 13:49:37 GMT

Tony,

Look at this sample.

http://help.arcgis.com/en/webapi/flex/samples/index.html?sample=MeasureDistance

Hi Robert, thanks for the link.

I looked up distance on the API as I figured it would be a common task, but decided I could not use it due to reference to server 10 (very depressing as I have 9.3.1)

distance(distanceParameters:DistanceParameters, responder:IResponder = null):AsyncToken
The distance operation is performed on a geometry service resource (only available with ArcGIS Server 10.0 or above).

This is why I have been trying with a polyline...

Re: Distance between 2 Points

RobertScheitlin__GISP — Tue, 12 Oct 2010 13:55:06 GMT

Tony,

What does your code for building the polyline look like?

Re: Distance between 2 Points

TonyCollins — Tue, 12 Oct 2010 14:03:10 GMT

Tony,

What does your code for building the polyline look like?

Thanks for your help Robert!

I have tried creating the polyline many ways and most seem to create one, but here is what I currently have:

var schoolMapPoint:MapPoint = findResult.feature.geometry as MapPoint;
var addressMapPoint:MapPoint = parentApplication.addressMapPoint;
var mapPoints:Array = [schoolMapPoint,addressMapPoint];
var polyLine:Polyline = new Polyline([mapPoints]);
..
..
lengthsParameters.polylines = [polyLine];
geometryService.lengths(lengthsParameters);

Re: Distance between 2 Points

TonyCollins — Tue, 12 Oct 2010 14:14:07 GMT

Hmm... hold up it now looks like I have a result...
Will post back after a little more debugging!

Re: Distance between 2 Points

TonyCollins — Tue, 12 Oct 2010 14:26:56 GMT

Firstly sorry to have wasted your time Robert, but at least this might help someone on 9.3.1 if there are any left!

It looks like my issue was that I was not giving the polyLine a spatialReference (although I'm sure I already tried that).

NOTE: I'm not using any map