source: Dev/trunk/src/client/dojox/geo/openlayers/Feature.js

define([
        "dojo/_base/kernel",
        "dojo/_base/declare",
        "./_base"
], function(dojo, declare, openlayers){

        return declare("dojox.geo.openlayers.Feature", null, {
                // summary:
                //              A Feature encapsulates an item so that it can be added to a Layer.
                //              This class is not attended to be used as it, but serve as a base class
                //              for specific features such as GeometryFeature which can display georeferenced 
                //              geometries and WidgetFeature which can display georeferenced widgets. 
                constructor: function(){
                        // summary:
                        //              Construct a new Feature
                        this._layer = null;
                        this._coordSys = openlayers.EPSG4326;
                },

                getCoordinateSystem: function(){
                        // summary:
                        //              Returns the coordinate system in which coordinates of this feature are expressed.
                        // returns:
                        //              The coordinate system in which coordinates of this feature are expressed.
                        return this._coordSys; // OpenLayers.Projection
                },

                setCoordinateSystem: function(/* OpenLayers.Projection */cs){
                        // summary:
                        //              Set the coordinate system in which coordinates of this feature are expressed.
                        // cs: OpenLayers.Projection
                        //              The coordinate system in which coordinates of this feature are expressed.
                        this._coordSys = cs;
                },

                getLayer: function(){
                        // summary:
                        //              Returns the Layer to which this feature belongs.
                        // returns:
                        //              The layer to which this feature belongs.
                        return this._layer; // dojox/geo/openlayers/Layer
                },

                _setLayer: function(/* dojox/geo/openlayers/Layer */l){
                        // summary:
                        //              Sets the layer to which this Feature belongs
                        // description:
                        //              Called when the feature is added to the Layer.
                        // tags:
                        //              private
                        this._layer = l;
                },

                render: function(){
                // summary:
                //              subclasses implements drawing specific behavior.
                },

                remove: function(){
                // summary:
                //              Subclasses implements specific behavior.
                //              Called when removed from the layer.
                },

                _getLocalXY: function(p){
                        // summary:
                        //              From projected coordinates to screen coordinates
                        // p: Object
                        //              Object with x and y fields
                        // tags:
                        //              private
                        var x = p.x;
                        var y = p.y;
                        var layer = this.getLayer();
                        var resolution = layer.olLayer.map.getResolution();
                        var extent = layer.olLayer.getExtent();
                        var rx = (x / resolution + (-extent.left / resolution));
                        var ry = ((extent.top / resolution) - y / resolution);
                        return [rx, ry];
                }
        });
});