More between points work + mobile UI work:
[bus.git] / openlayers / lib / OpenLayers / Format / GPX.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/* Copyright (c) 2006-2007 MetaCarta, Inc., published under a modified BSD license.
 * See http://svn.openlayers.org/trunk/openlayers/repository-license.txt 
 * for the full text of the license. */
 
/**
 * @requires OpenLayers/Format/XML.js
 * @requires OpenLayers/Feature/Vector.js
 * @requires OpenLayers/Geometry/Point.js
 * @requires OpenLayers/Geometry/LineString.js
 */
 
/**
 * Class: OpenLayers.Format.GPX
 * Read/write GPX parser. Create a new instance with the 
 *     <OpenLayers.Format.GPX> constructor.
 *
 * Inherits from:
 *  - <OpenLayers.Format.XML>
 */
OpenLayers.Format.GPX = OpenLayers.Class(OpenLayers.Format.XML, {
   /**
    * APIProperty: extractWaypoints
    * {Boolean} Extract waypoints from GPX. (default: true)
    */
    extractWaypoints: true,
    
   /**
    * APIProperty: extractTracks
    * {Boolean} Extract tracks from GPX. (default: true)
    */
    extractTracks: true,
    
   /**
    * APIProperty: extractRoutes
    * {Boolean} Extract routes from GPX. (default: true)
    */
    extractRoutes: true,
    
    /**
     * APIProperty: extractAttributes
     * {Boolean} Extract feature attributes from GPX. (default: true)
     *     NOTE: Attributes as part of extensions to the GPX standard may not
     *     be extracted.
     */
    extractAttributes: true,
    
    /**
     * Constructor: OpenLayers.Format.GPX
     * Create a new parser for GPX.
     *
     * Parameters:
     * options - {Object} An optional object whose properties will be set on
     *     this instance.
     */
    initialize: function(options) {
        OpenLayers.Format.XML.prototype.initialize.apply(this, [options]);
    },
    
    /**
     * APIMethod: read
     * Return a list of features from a GPX doc
     *
     * Parameters:
     * doc - {Element} 
     *
     * Returns:
     * An Array of <OpenLayers.Feature.Vector>s
     */
    read: function(doc) {
        if (typeof doc == "string") { 
            doc = OpenLayers.Format.XML.prototype.read.apply(this, [doc]);
        }
        var features = [];
        
        if(this.extractTracks) {
            var tracks = doc.getElementsByTagName("trk");
            for (var i=0, len=tracks.length; i<len; i++) {
                // Attributes are only in trk nodes, not trkseg nodes
                var attrs = {};
                if(this.extractAttributes) {
                    attrs = this.parseAttributes(tracks[i]);
                }
                
                var segs = this.getElementsByTagNameNS(tracks[i], tracks[i].namespaceURI, "trkseg");
                for (var j = 0, seglen = segs.length; j < seglen; j++) {
                    // We don't yet support extraction of trkpt attributes
                    // All trksegs of a trk get that trk's attributes
                    var track = this.extractSegment(segs[j], "trkpt");
                    features.push(new OpenLayers.Feature.Vector(track, attrs));
                }
            }
        }
        
        if(this.extractRoutes) {
            var routes = doc.getElementsByTagName("rte");
            for (var k=0, klen=routes.length; k<klen; k++) {
                var attrs = {};
                if(this.extractAttributes) {
                    attrs = this.parseAttributes(routes[k]);
                }
                var route = this.extractSegment(routes[k], "rtept");
                features.push(new OpenLayers.Feature.Vector(route, attrs));
            }
        }
        
        if(this.extractWaypoints) {
            var waypoints = doc.getElementsByTagName("wpt");
            for (var l = 0, len = waypoints.length; l < len; l++) {
                var attrs = {};
                if(this.extractAttributes) {
                    attrs = this.parseAttributes(waypoints[l]);
                }
                var wpt = new OpenLayers.Geometry.Point(waypoints[l].getAttribute("lon"), waypoints[l].getAttribute("lat"));
                features.push(new OpenLayers.Feature.Vector(wpt, attrs));
            }
        }
        
        if (this.internalProjection && this.externalProjection) {
            for (var g = 0, featLength = features.length; g < featLength; g++) {
                features[g].geometry.transform(this.externalProjection,
                                    this.internalProjection);
            }
        }
        
        return features;
    },
    
   /**
    * Method: extractSegment
    *
    * Parameters:
    * segment - {<DOMElement>} a trkseg or rte node to parse
    * segmentType - {String} nodeName of waypoints that form the line
    *
    * Returns:
    * {<OpenLayers.Geometry.LineString>} A linestring geometry
    */
    extractSegment: function(segment, segmentType) {
        var points = this.getElementsByTagNameNS(segment, segment.namespaceURI, segmentType);
        var point_features = [];
        for (var i = 0, len = points.length; i < len; i++) {
            point_features.push(new OpenLayers.Geometry.Point(points[i].getAttribute("lon"), points[i].getAttribute("lat")));
        }
        return new OpenLayers.Geometry.LineString(point_features);
    },
    
    /**
     * Method: parseAttributes
     *
     * Parameters:
     * node - {<DOMElement>}
     *
     * Returns:
     * {Object} An attributes object.
     */
    parseAttributes: function(node) {
        // node is either a wpt, trk or rte
        // attributes are children of the form <attr>value</attr>
        var attributes = {};
        var attrNode = node.firstChild;
        while(attrNode) {
            if(attrNode.nodeType == 1) {
                var value = attrNode.firstChild;
                if(value.nodeType == 3 || value.nodeType == 4) {
                    name = (attrNode.prefix) ?
                        attrNode.nodeName.split(":")[1] :
                        attrNode.nodeName;
                    if(name != "trkseg" && name != "rtept") {
                        attributes[name] = value.nodeValue;
                    }
                }
            }
            attrNode = attrNode.nextSibling;
        }
        return attributes;
    },
    
    CLASS_NAME: "OpenLayers.Format.GPX"
});