ArcGIS JS spatial reference helpers

spatialReference.js

define([], function(){

  return {

    // check if an object is a geometry
    isGeometry: function(object){
      return object.isInstanceOf(esri.geometry.Geometry);
    },

    // check if an object is a graphic
    isGraphic: function(object){
      return object.isInstanceOf(esri.Graphic);
    },

    // Check if a geometry or graphic is Geographic (Lat,Lng)
    isGeographic: function(object){
      if(this.isGraphic(object)){
        return object.geometry.spatialReference.wkid === 4326;
      } else if(this.isGeometry(object)) {
        return object.spatialReference.wkid === 4326;
      } else {
        return false;
      }
    },

    // Check if a geometry or graphic is In Web Mercator
    isWebMercator: function(object){
      if(this.isGraphic(object)){
        return object.geometry.spatialReference.wkid === 102100;
      } else if(this.isGeometry(object)) {
        return object.spatialReference.wkid === 102100;
      } else {
        return false;
      }
    },

    // Convert a geometry to webmercator if neccessary
    convertToWebMercator: function(geometry){
      if(this.isGeographic(geometry)) {
        return esri.geometry.geographicToWebMercator(geometry);
      } else {
        return geometry;
      }
    },

    // Convert a geometry to webmercator if neccessary
    convertToGeographic: function(geometry){
      if(this.isWebMercator(geometry)) {
        return esri.geometry.webMercatorToGeographic(geometry);
      } else {
        return geometry;
      }
    },

    convert: function(geometry) {
      if (this.isWebMercator(geometry)) {
        return this.convertToGeographic(geometry);
      } else if (this.isGeographic(geometry)) {
        return this.convertToWebMercator(geometry);
      }
    }

  };

});