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

define([
        "dojo/_base/declare",
        "dojo/_base/array",
        "dojo/_base/lang",
        "dojox/gfx/matrix",
        "./Point",
        "./LineString",
        "./Collection",
        "./Feature"
], function(declare, array, lang, matrix, Point, LineString, Collection, Feature){

        return declare("dojox.geo.openlayers.GeometryFeature", Feature, {
                // summary:
                //              A Feature encapsulating a geometry.
                // description:
                //              This Feature renders a geometry such as a Point or LineString geometry. This Feature
                //              is responsible for reprojecting the geometry before creating a gfx shape to display it.
                //              By default the shape created is a circle for a Point geometry and a polyline for a 
                //              LineString geometry. User can change these behavior by overriding the createShape 
                //              method to create the desired shape.
                // example:
                //      |  var geom = new dojox.geo.openlayers.Point({x:0, y:0});
                //      |  var gf = new dojox.geo.openlayers.GeometryFeature(geom);

                constructor: function(geometry){
                        // summary:
                        //              Constructs a GeometryFeature for the specified geometry.
                        // geometry: dojox/geo/openlayers/Geometry
                        //              The geometry to render.
                        this._geometry = geometry;
                        this._shapeProperties = {};
                        this._fill = null;
                        this._stroke = null;
                },

                _createCollection: function(/* dojox/geo/openlayers/Geometry */g){
                        // summary:
                        //              Create collection shape and add it to the viewport.
                        // tags:
                        //              private
                        var layer = this.getLayer();
                        var s = layer.getSurface();
                        var c = this.createShape(s, g);
                        var vp = layer.getViewport();
                        vp.add(c);
                        return c;
                },

                _getCollectionShape: function(/* dojox/geo/openlayers/Geometry */g){
                        // summary:
                        //              Get the collection shape, create it if necessary
                        // tags:
                        //              private
                        var s = g.shape;
                        if(s == null){
                                s = this._createCollection(g);
                                g.shape = s;
                        }
                        return s;
                },

                renderCollection: function(g){
                        // summary:
                        //              Renders a geometry collection.
                        // g: dojox.geo.openlayers.Geometry?
                        //              The geometry to render.
                        if(g == undefined){
                                g = this._geometry;
                        }

                        s = this._getCollectionShape(g);
                        var prop = this.getShapeProperties();
                        s.setShape(prop);

                        array.forEach(g.coordinates, function(item){
                                if(item instanceof Point){
                                        this.renderPoint(item);
                                }else if(item instanceof LineString){
                                        this.renderLineString(item);
                                }else if(item instanceof Collection){
                                        this.renderCollection(item);
                                }else{
                                        throw new Error();
                                }
                        }, this);
                        this._applyStyle(g);
                },

                render: function(g){
                        // summary:
                        //              Render a geometry. 
                        //              Called by the Layer on which the feature is added. 
                        // g: dojox/geo/openlayer/Geometry?
                        //              The geometry to draw
                        if(g == undefined){
                                g = this._geometry;
                        }

                        if(g instanceof Point){
                                this.renderPoint(g);
                        }else if(g instanceof LineString){
                                this.renderLineString(g);
                        }else if(g instanceof Collection){
                                this.renderCollection(g);
                        }else{
                                throw new Error();
                        }
                },

                getShapeProperties: function(){
                        // summary:
                        //              Returns the shape properties. 
                        // returns: Object
                        //              The shape properties.
                        return this._shapeProperties;
                },

                setShapeProperties: function(s){
                        // summary:
                        //              Sets the shape properties. 
                        // s: Object
                        //              The shape properties to set.
                        this._shapeProperties = s;
                        return this;
                },

                createShape: function(s, g){
                        // summary:
                        //              Called when the shape rendering the geometry has to be created.
                        //              This default implementation creates a circle for a point geometry, a polyline for
                        //              a LineString geometry and is recursively called when creating a collection.
                        //              User may replace this method to produce a custom shape.
                        // s: dojox/gfx/Surface
                        //              The surface on which the method create the shapes.
                        // g: dojox/geo/openlayers/Geometry?
                        //              The reference geometry 
                        // returns:
                        //              The resulting shape.
                        if(!g){
                                g = this._geometry;
                        }

                        var shape = null;
                        if(g instanceof Point){
                                shape = s.createCircle();
                        }else if(g instanceof LineString){
                                shape = s.createPolyline();
                        }else if(g instanceof Collection){
                                var grp = s.createGroup();
                                array.forEach(g.coordinates, function(item){
                                        var shp = this.createShape(s, item);
                                        grp.add(shp);
                                }, this);
                                shape = grp;
                        }else{
                                throw new Error();
                        }
                        return shape;
                },

                getShape: function(){
                        // summary:
                        //              Returns the shape rendering the geometry
                        // returns:
                        //              The shape used to render the geometry.
                        var g = this._geometry;
                        if(!g){
                                return null;
                        }
                        if(g.shape){
                                return g.shape;
                        }
                        this.render();
                        return g.shape; // dojox.gfx.shape.Shape
                },

                _createPoint: function(/* dojox/geo/openlayer/Geometry */g){
                        // summary:
                        //              Create a point shape
                        // tags:
                        //              private
                        var layer = this.getLayer();
                        var s = layer.getSurface();
                        var c = this.createShape(s, g);
                        var vp = layer.getViewport();
                        vp.add(c);
                        return c;
                },

                _getPointShape: function(/* dojox/geo/openlayers/Geometry */g){
                        // summary:
                        //              get the point geometry shape, create it if necessary
                        // tags:
                        //              private
                        var s = g.shape;
                        if(s == null){
                                s = this._createPoint(g);
                                g.shape = s;
                        }
                        return s;
                },

                renderPoint: function(g){
                        // summary:
                        //              Renders a point geometry.
                        // g: dojox/geo/openlayers/Point?
                        //              The geometry to render, or the current instance geometry if not specified.
                        if(g == undefined){
                                g = this._geometry;
                        }
                        var layer = this.getLayer();
                        var map = layer.getDojoMap();

                        s = this._getPointShape(g);
                        var prop = lang.mixin({}, this._defaults.pointShape);
                        prop = lang.mixin(prop, this.getShapeProperties());
                        s.setShape(prop);

                        var from = this.getCoordinateSystem();
                        var p = map.transform(g.coordinates, from);

                        var a = this._getLocalXY(p);
                        var cx = a[0];
                        var cy = a[1];
                        var tr = layer.getViewport().getTransform();
                        if(tr){
                                s.setTransform(matrix.translate(cx - tr.dx, cy - tr.dy));
                        }
                        this._applyStyle(g);
                },

                _createLineString: function(/* dojox/geo/openlayers/Geometry */g){
                        // summary:
                        //              Create polyline shape and add it to the viewport.
                        // tags:
                        //              private
                        var layer = this.getLayer();
                        var s = layer._surface;
                        var shape = this.createShape(s, g);
                        var vp = layer.getViewport();
                        vp.add(shape);
                        g.shape = shape;
                        return shape;
                },

                _getLineStringShape: function(/* dojox/geo/openlayers/Geometry */g){
                        // summary:
                        //              Get the line string geometry shape, create it if necessary
                        // tags:
                        //              private
                        var s = g.shape;
                        if(s == null){
                                s = this._createLineString(g);
                                g.shape = s;
                        }
                        return s;
                },

                renderLineString: function(g){
                        // summary:
                        //              Renders a line string geometry.
                        // g: dojox/geo/openlayers/Geometry?
                        //              The geometry to render.
                        if(g == undefined){
                                g = this._geometry;
                        }
                        var layer = this.getLayer();
                        var map = layer.getDojoMap();
                        var lss = this._getLineStringShape(g);
                        var from = this.getCoordinateSystem();
                        var points = new Array(g.coordinates.length); // ss.getShape().points;          
                        var tr = layer.getViewport().getTransform();
                        array.forEach(g.coordinates, function(c, i, array){
                                var p = map.transform(c, from);
                                var a = this._getLocalXY(p);
                                if(tr){
                                        a[0] -= tr.dx;
                                        a[1] -= tr.dy;
                                }
                                points[i] = {
                                        x: a[0],
                                        y: a[1]
                                };
                        }, this);
                        var prop = lang.mixin({}, this._defaults.lineStringShape);
                        prop = lang.mixin(prop, this.getShapeProperties());
                        prop = lang.mixin(prop, {
                                points: points
                        });
                        lss.setShape(prop);
                        this._applyStyle(g);
                },

                _applyStyle: function(g){
                        // summary:
                        //              Apply the style on the geometry's shape.
                        // g: Geometry
                        //              The geometry.
                        // tags:
                        //              private
                        if(!g || !g.shape){
                                return;
                        }

                        var f = this.getFill();

                        var fill;
                        if(!f || lang.isString(f) || lang.isArray(f)){
                                fill = f;
                        }else{
                                fill = lang.mixin({}, this._defaults.fill);
                                fill = lang.mixin(fill, f);
                        }

                        var s = this.getStroke();
                        var stroke;
                        if(!s || lang.isString(s) || lang.isArray(s)){
                                stroke = s;
                        }else{
                                stroke = lang.mixin({}, this._defaults.stroke);
                                stroke = lang.mixin(stroke, s);
                        }

                        this._applyRecusiveStyle(g, stroke, fill);
                },

                _applyRecusiveStyle: function(g, stroke, fill){
                        // summary:
                        //              Apply the style on the geometry's shape recursively.
                        // g: dojox.geo.openlayers.Geometry
                        //              The geometry.
                        // stroke: Object
                        //              The stroke
                        // fill:Object
                        //              The fill
                        // tags:
                        //              private
                        var shp = g.shape;

                        if(shp.setFill){
                                shp.setFill(fill);
                        }

                        if(shp.setStroke){
                                shp.setStroke(stroke);
                        }

                        if(g instanceof Collection){
                                array.forEach(g.coordinates, function(i){
                                        this._applyRecusiveStyle(i, stroke, fill);
                                }, this);
                        }
                },

                setStroke: function(s){
                        // summary:
                        //              Set the stroke style to be applied on the rendered shape.
                        // s: Object
                        //              The stroke style
                        this._stroke = s;
                        return this;
                },

                getStroke: function(){
                        // summary:
                        //              Returns the stroke style
                        // returns:
                        //              The stroke style
                        return this._stroke;
                },

                setFill: function(f){
                        // summary:
                        //              Set the fill style to be applied on the rendered shape.
                        // f: Object
                        //              The fill style
                        this._fill = f;
                        return this;
                },

                getFill: function(){
                        // summary:
                        //              Returns the fill style
                        // returns:
                        //              The fill style
                        return this._fill;
                },

                remove: function(){
                        // summary:
                        //              Removes the shape from the Surface. 
                        //              Called when the feature is removed from the layer.
                        var g = this._geometry;
                        var shp = g.shape;
                        g.shape = null;
                        if(shp){
                                shp.removeShape();
                        }
                        if(g instanceof Collection){
                                array.forEach(g.coordinates, function(i){
                                        this.remove(i);
                                }, this);
                        }
                },

                _defaults: {
                        fill: null,
                        stroke: null,
                        pointShape: {
                                r: 30
                        },
                        lineStringShape: null
                }

        });
});