Subversion Repositories eFlore/Applications.moissonnage

/*global L: true */

L.GPX = L.FeatureGroup.extend({
        initialize: function(gpx, options) {
                L.Util.setOptions(this, options);
                this._gpx = gpx;
                this._layers = {};
                
                if (gpx) {
                        this.addGPX(gpx, options, this.options.async);
                }
        },
        
        loadXML: function(url, cb, options, async) {
                if (async == undefined) async = this.options.async;
                if (options == undefined) options = this.options;

                var req = new window.XMLHttpRequest();
                req.open('GET', url, async);
                try {
                        req.overrideMimeType('text/xml'); // unsupported by IE
                } catch(e) {}
                req.onreadystatechange = function() {
                        if (req.readyState != 4) return;
                        if(req.status == 200) cb(req.responseXML, options);
                };
                req.send(null);
        },

        addGPX: function(url, options, async) {
                var _this = this;
                var cb = function(gpx, options) { _this._addGPX(gpx, options) };
                this.loadXML(url, cb, options, async);
        },

        _addGPX: function(gpx, options) {
                var layers = this.parseGPX(gpx, options);
                if (!layers) return;
                this.addLayer(layers);
                this.fire("loaded");
        },

        parseGPX: function(xml, options) {
                var j, i, el, layers = [];
                var named = false, tags = [['rte','rtept'], ['trkseg','trkpt']];

                for (j = 0; j < tags.length; j++) {
                        el = xml.getElementsByTagName(tags[j][0]);
                        for (i = 0; i < el.length; i++) {
                                var l = this.parse_trkseg(el[i], xml, options, tags[j][1]);
                                for (var k = 0; k < l.length; k++) {
                                        if (this.parse_name(el[i], l[k])) named = true;
                                        layers.push(l[k]);
                                }
                        }
                }

                el = xml.getElementsByTagName('wpt');
                for (i = 0; i < el.length; i++) {
                        var l = this.parse_wpt(el[i], xml, options);
                        if (!l) continue;
                        if (this.parse_name(el[i], l)) named = true;
                        layers.push(l);
                }

                if (!layers.length) return;
                var layer = layers[0];
                if (layers.length > 1) 
                        layer = new L.FeatureGroup(layers);
                //if (!named) this.parse_name(xml, layer);
                return layer;
        },

        parse_name: function(xml, layer) {
                var i, el, name, descr="";
                el = xml.getElementsByTagName('name');
                if (el.length) name = el[0].childNodes[0].nodeValue;
                el = xml.getElementsByTagName('desc');
                for (i = 0; i < el.length; i++) {
                        for (var j = 0; j < el[i].childNodes.length; j++)
                                descr = descr + el[i].childNodes[j].nodeValue;
                }
                if (!name) return;
                var txt = "<h2>" + name + "</h2>" + descr;
                if (layer && layer._popup === undefined) layer.bindPopup(txt);
                return txt;
        },

        parse_trkseg: function(line, xml, options, tag) {
                var el = line.getElementsByTagName(tag);
                if (!el.length) return [];
                var coords = [];
                for (var i = 0; i < el.length; i++) {
                        var ll = new L.LatLng(el[i].getAttribute('lat'),
                                                el[i].getAttribute('lon'));
                        ll.meta = {};
                        for (var j in el[i].childNodes) {
                                var e = el[i].childNodes[j];
                                if (!e.tagName) continue;
                                ll.meta[e.tagName] = e.textContent;
                        }
                        coords.push(ll);
                }
                var l = [new L.Polyline(coords, options)];
                this.fire('addline', {line:l})
                return l;
        },

        parse_wpt: function(e, xml, options) {
                var m = new L.Marker(new L.LatLng(e.getAttribute('lat'),
                                                e.getAttribute('lon')), options);
                this.fire('addpoint', {point:m});
                return m;
        }
});