Intersect for javascript

Question

hi i need examples of Intersect method in javascript

ana_salgado · Answer

yes, I'll do it with GeometryService, but my polygons are a map service I want to know how to put this in my function I have something like gs.intersect

var gs = new esri.tasks.GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");

gs.intersect (mispuntos, my service, onCompleteFunc, onErrorFunc);

mispuntos = user are assigned

my service = is a mapping service that is defined.

GorkemTolan · Answer

I can suggest two ways one of the is if you have a polygon as a geometry in the map then you may use polygon.contains(point) as long as they are in the same spatial reference, it's a synchronous method, which means process wait until it completes. The other option is GeometryService.instersect([polygon], point, successFunction, errorFunction)

GeometryService allows you to intersect multiple geometries to a geometry in the same spatial reference. This method is a asynchronous method, which means the process will be done in the background. Once it completes calls the successFunction, if there is no error. I'm assuming the map service's geometry type is polygon. So another option I can think is Identify the point in the polygon. If it returns with results then the point intersects to the polygon.

var identify = new IdentifyTask(url);

identifyParams.geometry = evt.mapPoint;

identifyParams.mapExtent = map.extent;
identify.execute(identifyParams, successFunction, errorFunction);

I hope it helps.

RiyasDeen · Answer

Hi Ana,

if you have got your polygon and point geometry object, then you can use contains on your polygon geometry.

polygon-amd | API Reference | ArcGIS API for JavaScript