[76] | 1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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| 2 | * full list of contributors). Published under the Clear BSD license. |
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| 3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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| 4 | * full text of the license. */ |
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| 5 | |
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| 6 | /** |
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| 7 | * @requires OpenLayers/Format/XML.js |
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| 8 | * @requires OpenLayers/Feature/Vector.js |
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| 9 | * @requires OpenLayers/Geometry/Point.js |
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| 10 | * @requires OpenLayers/Geometry/LineString.js |
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| 11 | * @requires OpenLayers/Geometry/Polygon.js |
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| 12 | * @requires OpenLayers/Geometry/Collection.js |
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| 13 | * @requires OpenLayers/Request/XMLHttpRequest.js |
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| 14 | * @requires OpenLayers/Console.js |
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| 15 | * @requires OpenLayers/Projection.js |
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| 16 | */ |
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| 17 | |
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| 18 | /** |
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| 19 | * Class: OpenLayers.Format.KML |
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| 20 | * Read/Write KML. Create a new instance with the <OpenLayers.Format.KML> |
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| 21 | * constructor. |
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| 22 | * |
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| 23 | * Inherits from: |
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| 24 | * - <OpenLayers.Format.XML> |
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| 25 | */ |
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| 26 | OpenLayers.Format.KML = OpenLayers.Class(OpenLayers.Format.XML, { |
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| 27 | |
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| 28 | /** |
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| 29 | * Property: namespaces |
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| 30 | * {Object} Mapping of namespace aliases to namespace URIs. |
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| 31 | */ |
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| 32 | namespaces: { |
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| 33 | kml: "http://www.opengis.net/kml/2.2", |
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| 34 | gx: "http://www.google.com/kml/ext/2.2" |
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| 35 | }, |
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| 36 | |
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| 37 | /** |
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| 38 | * APIProperty: kmlns |
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| 39 | * {String} KML Namespace to use. Defaults to 2.0 namespace. |
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| 40 | */ |
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| 41 | kmlns: "http://earth.google.com/kml/2.0", |
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| 42 | |
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| 43 | /** |
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| 44 | * APIProperty: placemarksDesc |
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| 45 | * {String} Name of the placemarks. Default is "No description available". |
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| 46 | */ |
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| 47 | placemarksDesc: "No description available", |
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| 48 | |
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| 49 | /** |
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| 50 | * APIProperty: foldersName |
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| 51 | * {String} Name of the folders. Default is "OpenLayers export". |
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| 52 | * If set to null, no name element will be created. |
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| 53 | */ |
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| 54 | foldersName: "OpenLayers export", |
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| 55 | |
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| 56 | /** |
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| 57 | * APIProperty: foldersDesc |
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| 58 | * {String} Description of the folders. Default is "Exported on [date]." |
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| 59 | * If set to null, no description element will be created. |
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| 60 | */ |
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| 61 | foldersDesc: "Exported on " + new Date(), |
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| 62 | |
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| 63 | /** |
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| 64 | * APIProperty: extractAttributes |
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| 65 | * {Boolean} Extract attributes from KML. Default is true. |
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| 66 | * Extracting styleUrls requires this to be set to true |
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| 67 | */ |
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| 68 | extractAttributes: true, |
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| 69 | |
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| 70 | /** |
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| 71 | * Property: extractStyles |
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| 72 | * {Boolean} Extract styles from KML. Default is false. |
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| 73 | * Extracting styleUrls also requires extractAttributes to be |
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| 74 | * set to true |
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| 75 | */ |
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| 76 | extractStyles: false, |
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| 77 | |
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| 78 | /** |
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| 79 | * APIProperty: extractTracks |
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| 80 | * {Boolean} Extract gx:Track elements from Placemark elements. Default |
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| 81 | * is false. If true, features will be generated for all points in |
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| 82 | * all gx:Track elements. Features will have a when (Date) attribute |
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| 83 | * based on when elements in the track. If tracks include angle |
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| 84 | * elements, features will have heading, tilt, and roll attributes. |
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| 85 | * If track point coordinates have three values, features will have |
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| 86 | * an altitude attribute with the third coordinate value. |
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| 87 | */ |
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| 88 | extractTracks: false, |
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| 89 | |
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| 90 | /** |
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| 91 | * APIProperty: trackAttributes |
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| 92 | * {Array} If <extractTracks> is true, points within gx:Track elements will |
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| 93 | * be parsed as features with when, heading, tilt, and roll attributes. |
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| 94 | * Any additional attribute names can be provided in <trackAttributes>. |
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| 95 | */ |
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| 96 | trackAttributes: null, |
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| 97 | |
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| 98 | /** |
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| 99 | * Property: internalns |
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| 100 | * {String} KML Namespace to use -- defaults to the namespace of the |
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| 101 | * Placemark node being parsed, but falls back to kmlns. |
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| 102 | */ |
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| 103 | internalns: null, |
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| 104 | |
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| 105 | /** |
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| 106 | * Property: features |
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| 107 | * {Array} Array of features |
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| 108 | * |
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| 109 | */ |
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| 110 | features: null, |
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| 111 | |
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| 112 | /** |
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| 113 | * Property: styles |
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| 114 | * {Object} Storage of style objects |
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| 115 | * |
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| 116 | */ |
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| 117 | styles: null, |
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| 118 | |
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| 119 | /** |
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| 120 | * Property: styleBaseUrl |
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| 121 | * {String} |
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| 122 | */ |
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| 123 | styleBaseUrl: "", |
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| 124 | |
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| 125 | /** |
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| 126 | * Property: fetched |
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| 127 | * {Object} Storage of KML URLs that have been fetched before |
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| 128 | * in order to prevent reloading them. |
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| 129 | */ |
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| 130 | fetched: null, |
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| 131 | |
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| 132 | /** |
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| 133 | * APIProperty: maxDepth |
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| 134 | * {Integer} Maximum depth for recursive loading external KML URLs |
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| 135 | * Defaults to 0: do no external fetching |
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| 136 | */ |
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| 137 | maxDepth: 0, |
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| 138 | |
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| 139 | /** |
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| 140 | * Constructor: OpenLayers.Format.KML |
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| 141 | * Create a new parser for KML. |
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| 142 | * |
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| 143 | * Parameters: |
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| 144 | * options - {Object} An optional object whose properties will be set on |
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| 145 | * this instance. |
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| 146 | */ |
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| 147 | initialize: function(options) { |
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| 148 | // compile regular expressions once instead of every time they are used |
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| 149 | this.regExes = { |
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| 150 | trimSpace: (/^\s*|\s*$/g), |
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| 151 | removeSpace: (/\s*/g), |
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| 152 | splitSpace: (/\s+/), |
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| 153 | trimComma: (/\s*,\s*/g), |
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| 154 | kmlColor: (/(\w{2})(\w{2})(\w{2})(\w{2})/), |
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| 155 | kmlIconPalette: (/root:\/\/icons\/palette-(\d+)(\.\w+)/), |
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| 156 | straightBracket: (/\$\[(.*?)\]/g) |
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| 157 | }; |
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| 158 | // KML coordinates are always in longlat WGS84 |
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| 159 | this.externalProjection = new OpenLayers.Projection("EPSG:4326"); |
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| 160 | |
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| 161 | OpenLayers.Format.XML.prototype.initialize.apply(this, [options]); |
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| 162 | }, |
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| 163 | |
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| 164 | /** |
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| 165 | * APIMethod: read |
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| 166 | * Read data from a string, and return a list of features. |
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| 167 | * |
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| 168 | * Parameters: |
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| 169 | * data - {String} or {DOMElement} data to read/parse. |
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| 170 | * |
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| 171 | * Returns: |
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| 172 | * {Array(<OpenLayers.Feature.Vector>)} List of features. |
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| 173 | */ |
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| 174 | read: function(data) { |
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| 175 | this.features = []; |
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| 176 | this.styles = {}; |
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| 177 | this.fetched = {}; |
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| 178 | |
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| 179 | // Set default options |
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| 180 | var options = { |
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| 181 | depth: 0, |
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| 182 | styleBaseUrl: this.styleBaseUrl |
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| 183 | }; |
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| 184 | |
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| 185 | return this.parseData(data, options); |
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| 186 | }, |
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| 187 | |
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| 188 | /** |
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| 189 | * Method: parseData |
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| 190 | * Read data from a string, and return a list of features. |
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| 191 | * |
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| 192 | * Parameters: |
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| 193 | * data - {String} or {DOMElement} data to read/parse. |
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| 194 | * options - {Object} Hash of options |
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| 195 | * |
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| 196 | * Returns: |
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| 197 | * {Array(<OpenLayers.Feature.Vector>)} List of features. |
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| 198 | */ |
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| 199 | parseData: function(data, options) { |
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| 200 | if(typeof data == "string") { |
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| 201 | data = OpenLayers.Format.XML.prototype.read.apply(this, [data]); |
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| 202 | } |
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| 203 | |
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| 204 | // Loop throught the following node types in this order and |
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| 205 | // process the nodes found |
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| 206 | var types = ["Link", "NetworkLink", "Style", "StyleMap", "Placemark"]; |
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| 207 | for(var i=0, len=types.length; i<len; ++i) { |
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| 208 | var type = types[i]; |
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| 209 | |
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| 210 | var nodes = this.getElementsByTagNameNS(data, "*", type); |
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| 211 | |
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| 212 | // skip to next type if no nodes are found |
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| 213 | if(nodes.length == 0) { |
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| 214 | continue; |
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| 215 | } |
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| 216 | |
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| 217 | switch (type.toLowerCase()) { |
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| 218 | |
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| 219 | // Fetch external links |
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| 220 | case "link": |
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| 221 | case "networklink": |
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| 222 | this.parseLinks(nodes, options); |
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| 223 | break; |
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| 224 | |
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| 225 | // parse style information |
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| 226 | case "style": |
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| 227 | if (this.extractStyles) { |
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| 228 | this.parseStyles(nodes, options); |
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| 229 | } |
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| 230 | break; |
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| 231 | case "stylemap": |
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| 232 | if (this.extractStyles) { |
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| 233 | this.parseStyleMaps(nodes, options); |
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| 234 | } |
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| 235 | break; |
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| 236 | |
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| 237 | // parse features |
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| 238 | case "placemark": |
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| 239 | this.parseFeatures(nodes, options); |
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| 240 | break; |
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| 241 | } |
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| 242 | } |
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| 243 | |
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| 244 | return this.features; |
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| 245 | }, |
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| 246 | |
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| 247 | /** |
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| 248 | * Method: parseLinks |
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| 249 | * Finds URLs of linked KML documents and fetches them |
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| 250 | * |
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| 251 | * Parameters: |
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| 252 | * nodes - {Array} of {DOMElement} data to read/parse. |
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| 253 | * options - {Object} Hash of options |
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| 254 | * |
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| 255 | */ |
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| 256 | parseLinks: function(nodes, options) { |
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| 257 | |
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| 258 | // Fetch external links <NetworkLink> and <Link> |
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| 259 | // Don't do anything if we have reached our maximum depth for recursion |
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| 260 | if (options.depth >= this.maxDepth) { |
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| 261 | return false; |
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| 262 | } |
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| 263 | |
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| 264 | // increase depth |
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| 265 | var newOptions = OpenLayers.Util.extend({}, options); |
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| 266 | newOptions.depth++; |
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| 267 | |
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| 268 | for(var i=0, len=nodes.length; i<len; i++) { |
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| 269 | var href = this.parseProperty(nodes[i], "*", "href"); |
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| 270 | if(href && !this.fetched[href]) { |
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| 271 | this.fetched[href] = true; // prevent reloading the same urls |
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| 272 | var data = this.fetchLink(href); |
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| 273 | if (data) { |
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| 274 | this.parseData(data, newOptions); |
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| 275 | } |
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| 276 | } |
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| 277 | } |
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| 278 | |
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| 279 | }, |
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| 280 | |
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| 281 | /** |
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| 282 | * Method: fetchLink |
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| 283 | * Fetches a URL and returns the result |
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| 284 | * |
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| 285 | * Parameters: |
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| 286 | * href - {String} url to be fetched |
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| 287 | * |
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| 288 | */ |
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| 289 | fetchLink: function(href) { |
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| 290 | var request = OpenLayers.Request.GET({url: href, async: false}); |
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| 291 | if (request) { |
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| 292 | return request.responseText; |
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| 293 | } |
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| 294 | }, |
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| 295 | |
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| 296 | /** |
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| 297 | * Method: parseStyles |
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| 298 | * Looks for <Style> nodes in the data and parses them |
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| 299 | * Also parses <StyleMap> nodes, but only uses the 'normal' key |
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| 300 | * |
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| 301 | * Parameters: |
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| 302 | * nodes - {Array} of {DOMElement} data to read/parse. |
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| 303 | * options - {Object} Hash of options |
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| 304 | * |
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| 305 | */ |
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| 306 | parseStyles: function(nodes, options) { |
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| 307 | for(var i=0, len=nodes.length; i<len; i++) { |
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| 308 | var style = this.parseStyle(nodes[i]); |
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| 309 | if(style) { |
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| 310 | var styleName = (options.styleBaseUrl || "") + "#" + style.id; |
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| 311 | |
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| 312 | this.styles[styleName] = style; |
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| 313 | } |
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| 314 | } |
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| 315 | }, |
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| 316 | |
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| 317 | /** |
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| 318 | * Method: parseKmlColor |
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| 319 | * Parses a kml color (in 'aabbggrr' format) and returns the corresponding |
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| 320 | * color and opacity or null if the color is invalid. |
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| 321 | * |
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| 322 | * Parameters: |
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| 323 | * kmlColor - {String} a kml formated color |
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| 324 | * |
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| 325 | * Returns: |
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| 326 | * {Object} |
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| 327 | */ |
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| 328 | parseKmlColor: function(kmlColor) { |
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| 329 | var color = null; |
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| 330 | if (kmlColor) { |
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| 331 | var matches = kmlColor.match(this.regExes.kmlColor); |
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| 332 | if (matches) { |
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| 333 | color = { |
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| 334 | color: '#' + matches[4] + matches[3] + matches[2], |
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| 335 | opacity: parseInt(matches[1], 16) / 255 |
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| 336 | }; |
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| 337 | } |
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| 338 | } |
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| 339 | return color; |
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| 340 | }, |
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| 341 | |
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| 342 | /** |
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| 343 | * Method: parseStyle |
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| 344 | * Parses the children of a <Style> node and builds the style hash |
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| 345 | * accordingly |
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| 346 | * |
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| 347 | * Parameters: |
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| 348 | * node - {DOMElement} <Style> node |
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| 349 | * |
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| 350 | */ |
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| 351 | parseStyle: function(node) { |
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| 352 | var style = {}; |
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| 353 | |
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| 354 | var types = ["LineStyle", "PolyStyle", "IconStyle", "BalloonStyle", |
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| 355 | "LabelStyle"]; |
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| 356 | var type, nodeList, geometry, parser; |
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| 357 | for(var i=0, len=types.length; i<len; ++i) { |
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| 358 | type = types[i]; |
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| 359 | styleTypeNode = this.getElementsByTagNameNS(node, |
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| 360 | "*", type)[0]; |
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| 361 | if(!styleTypeNode) { |
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| 362 | continue; |
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| 363 | } |
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| 364 | |
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| 365 | // only deal with first geometry of this type |
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| 366 | switch (type.toLowerCase()) { |
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| 367 | case "linestyle": |
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| 368 | var kmlColor = this.parseProperty(styleTypeNode, "*", "color"); |
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| 369 | var color = this.parseKmlColor(kmlColor); |
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| 370 | if (color) { |
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| 371 | style["strokeColor"] = color.color; |
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| 372 | style["strokeOpacity"] = color.opacity; |
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| 373 | } |
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| 374 | |
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| 375 | var width = this.parseProperty(styleTypeNode, "*", "width"); |
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| 376 | if (width) { |
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| 377 | style["strokeWidth"] = width; |
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| 378 | } |
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| 379 | break; |
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| 380 | |
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| 381 | case "polystyle": |
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| 382 | var kmlColor = this.parseProperty(styleTypeNode, "*", "color"); |
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| 383 | var color = this.parseKmlColor(kmlColor); |
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| 384 | if (color) { |
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| 385 | style["fillOpacity"] = color.opacity; |
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| 386 | style["fillColor"] = color.color; |
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| 387 | } |
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| 388 | // Check if fill is disabled |
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| 389 | var fill = this.parseProperty(styleTypeNode, "*", "fill"); |
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| 390 | if (fill == "0") { |
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| 391 | style["fillColor"] = "none"; |
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| 392 | } |
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| 393 | // Check if outline is disabled |
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| 394 | var outline = this.parseProperty(styleTypeNode, "*", "outline"); |
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| 395 | if (outline == "0") { |
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| 396 | style["strokeWidth"] = "0"; |
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| 397 | } |
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| 398 | |
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| 399 | break; |
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| 400 | |
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| 401 | case "iconstyle": |
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| 402 | // set scale |
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| 403 | var scale = parseFloat(this.parseProperty(styleTypeNode, |
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| 404 | "*", "scale") || 1); |
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| 405 | |
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| 406 | // set default width and height of icon |
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| 407 | var width = 32 * scale; |
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| 408 | var height = 32 * scale; |
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| 409 | |
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| 410 | var iconNode = this.getElementsByTagNameNS(styleTypeNode, |
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| 411 | "*", |
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| 412 | "Icon")[0]; |
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| 413 | if (iconNode) { |
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| 414 | var href = this.parseProperty(iconNode, "*", "href"); |
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| 415 | if (href) { |
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| 416 | |
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| 417 | var w = this.parseProperty(iconNode, "*", "w"); |
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| 418 | var h = this.parseProperty(iconNode, "*", "h"); |
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| 419 | |
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| 420 | // Settings for Google specific icons that are 64x64 |
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| 421 | // We set the width and height to 64 and halve the |
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| 422 | // scale to prevent icons from being too big |
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| 423 | var google = "http://maps.google.com/mapfiles/kml"; |
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| 424 | if (OpenLayers.String.startsWith( |
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| 425 | href, google) && !w && !h) { |
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| 426 | w = 64; |
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| 427 | h = 64; |
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| 428 | scale = scale / 2; |
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| 429 | } |
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| 430 | |
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| 431 | // if only dimension is defined, make sure the |
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| 432 | // other one has the same value |
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| 433 | w = w || h; |
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| 434 | h = h || w; |
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| 435 | |
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| 436 | if (w) { |
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| 437 | width = parseInt(w) * scale; |
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| 438 | } |
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| 439 | |
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| 440 | if (h) { |
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| 441 | height = parseInt(h) * scale; |
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| 442 | } |
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| 443 | |
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| 444 | // support for internal icons |
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| 445 | // (/root://icons/palette-x.png) |
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| 446 | // x and y tell the position on the palette: |
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| 447 | // - in pixels |
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| 448 | // - starting from the left bottom |
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| 449 | // We translate that to a position in the list |
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| 450 | // and request the appropriate icon from the |
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| 451 | // google maps website |
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| 452 | var matches = href.match(this.regExes.kmlIconPalette); |
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| 453 | if (matches) { |
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| 454 | var palette = matches[1]; |
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| 455 | var file_extension = matches[2]; |
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| 456 | |
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| 457 | var x = this.parseProperty(iconNode, "*", "x"); |
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| 458 | var y = this.parseProperty(iconNode, "*", "y"); |
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| 459 | |
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| 460 | var posX = x ? x/32 : 0; |
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| 461 | var posY = y ? (7 - y/32) : 7; |
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| 462 | |
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| 463 | var pos = posY * 8 + posX; |
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| 464 | href = "http://maps.google.com/mapfiles/kml/pal" |
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| 465 | + palette + "/icon" + pos + file_extension; |
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| 466 | } |
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| 467 | |
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| 468 | style["graphicOpacity"] = 1; // fully opaque |
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| 469 | style["externalGraphic"] = href; |
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| 470 | } |
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| 471 | |
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| 472 | } |
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| 473 | |
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| 474 | |
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| 475 | // hotSpots define the offset for an Icon |
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| 476 | var hotSpotNode = this.getElementsByTagNameNS(styleTypeNode, |
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| 477 | "*", |
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| 478 | "hotSpot")[0]; |
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| 479 | if (hotSpotNode) { |
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| 480 | var x = parseFloat(hotSpotNode.getAttribute("x")); |
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| 481 | var y = parseFloat(hotSpotNode.getAttribute("y")); |
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| 482 | |
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| 483 | var xUnits = hotSpotNode.getAttribute("xunits"); |
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| 484 | if (xUnits == "pixels") { |
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| 485 | style["graphicXOffset"] = -x * scale; |
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| 486 | } |
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| 487 | else if (xUnits == "insetPixels") { |
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| 488 | style["graphicXOffset"] = -width + (x * scale); |
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| 489 | } |
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| 490 | else if (xUnits == "fraction") { |
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| 491 | style["graphicXOffset"] = -width * x; |
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| 492 | } |
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| 493 | |
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| 494 | var yUnits = hotSpotNode.getAttribute("yunits"); |
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| 495 | if (yUnits == "pixels") { |
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| 496 | style["graphicYOffset"] = -height + (y * scale) + 1; |
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| 497 | } |
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| 498 | else if (yUnits == "insetPixels") { |
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| 499 | style["graphicYOffset"] = -(y * scale) + 1; |
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| 500 | } |
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| 501 | else if (yUnits == "fraction") { |
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| 502 | style["graphicYOffset"] = -height * (1 - y) + 1; |
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| 503 | } |
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| 504 | } |
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| 505 | |
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| 506 | style["graphicWidth"] = width; |
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| 507 | style["graphicHeight"] = height; |
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| 508 | break; |
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| 509 | |
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| 510 | case "balloonstyle": |
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| 511 | var balloonStyle = OpenLayers.Util.getXmlNodeValue( |
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| 512 | styleTypeNode); |
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| 513 | if (balloonStyle) { |
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| 514 | style["balloonStyle"] = balloonStyle.replace( |
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| 515 | this.regExes.straightBracket, "${$1}"); |
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| 516 | } |
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| 517 | break; |
---|
| 518 | case "labelstyle": |
---|
| 519 | var kmlColor = this.parseProperty(styleTypeNode, "*", "color"); |
---|
| 520 | var color = this.parseKmlColor(kmlColor); |
---|
| 521 | if (color) { |
---|
| 522 | style["fontColor"] = color.color; |
---|
| 523 | style["fontOpacity"] = color.opacity; |
---|
| 524 | } |
---|
| 525 | break; |
---|
| 526 | |
---|
| 527 | default: |
---|
| 528 | } |
---|
| 529 | } |
---|
| 530 | |
---|
| 531 | // Some polygons have no line color, so we use the fillColor for that |
---|
| 532 | if (!style["strokeColor"] && style["fillColor"]) { |
---|
| 533 | style["strokeColor"] = style["fillColor"]; |
---|
| 534 | } |
---|
| 535 | |
---|
| 536 | var id = node.getAttribute("id"); |
---|
| 537 | if (id && style) { |
---|
| 538 | style.id = id; |
---|
| 539 | } |
---|
| 540 | |
---|
| 541 | return style; |
---|
| 542 | }, |
---|
| 543 | |
---|
| 544 | /** |
---|
| 545 | * Method: parseStyleMaps |
---|
| 546 | * Looks for <Style> nodes in the data and parses them |
---|
| 547 | * Also parses <StyleMap> nodes, but only uses the 'normal' key |
---|
| 548 | * |
---|
| 549 | * Parameters: |
---|
| 550 | * nodes - {Array} of {DOMElement} data to read/parse. |
---|
| 551 | * options - {Object} Hash of options |
---|
| 552 | * |
---|
| 553 | */ |
---|
| 554 | parseStyleMaps: function(nodes, options) { |
---|
| 555 | // Only the default or "normal" part of the StyleMap is processed now |
---|
| 556 | // To do the select or "highlight" bit, we'd need to change lots more |
---|
| 557 | |
---|
| 558 | for(var i=0, len=nodes.length; i<len; i++) { |
---|
| 559 | var node = nodes[i]; |
---|
| 560 | var pairs = this.getElementsByTagNameNS(node, "*", |
---|
| 561 | "Pair"); |
---|
| 562 | |
---|
| 563 | var id = node.getAttribute("id"); |
---|
| 564 | for (var j=0, jlen=pairs.length; j<jlen; j++) { |
---|
| 565 | var pair = pairs[j]; |
---|
| 566 | // Use the shortcut in the SLD format to quickly retrieve the |
---|
| 567 | // value of a node. Maybe it's good to have a method in |
---|
| 568 | // Format.XML to do this |
---|
| 569 | var key = this.parseProperty(pair, "*", "key"); |
---|
| 570 | var styleUrl = this.parseProperty(pair, "*", "styleUrl"); |
---|
| 571 | |
---|
| 572 | if (styleUrl && key == "normal") { |
---|
| 573 | this.styles[(options.styleBaseUrl || "") + "#" + id] = |
---|
| 574 | this.styles[(options.styleBaseUrl || "") + styleUrl]; |
---|
| 575 | } |
---|
| 576 | |
---|
| 577 | if (styleUrl && key == "highlight") { |
---|
| 578 | // TODO: implement the "select" part |
---|
| 579 | } |
---|
| 580 | |
---|
| 581 | } |
---|
| 582 | } |
---|
| 583 | |
---|
| 584 | }, |
---|
| 585 | |
---|
| 586 | |
---|
| 587 | /** |
---|
| 588 | * Method: parseFeatures |
---|
| 589 | * Loop through all Placemark nodes and parse them. |
---|
| 590 | * Will create a list of features |
---|
| 591 | * |
---|
| 592 | * Parameters: |
---|
| 593 | * nodes - {Array} of {DOMElement} data to read/parse. |
---|
| 594 | * options - {Object} Hash of options |
---|
| 595 | * |
---|
| 596 | */ |
---|
| 597 | parseFeatures: function(nodes, options) { |
---|
| 598 | var features = []; |
---|
| 599 | for(var i=0, len=nodes.length; i<len; i++) { |
---|
| 600 | var featureNode = nodes[i]; |
---|
| 601 | var feature = this.parseFeature.apply(this,[featureNode]) ; |
---|
| 602 | if(feature) { |
---|
| 603 | |
---|
| 604 | // Create reference to styleUrl |
---|
| 605 | if (this.extractStyles && feature.attributes && |
---|
| 606 | feature.attributes.styleUrl) { |
---|
| 607 | feature.style = this.getStyle(feature.attributes.styleUrl, options); |
---|
| 608 | } |
---|
| 609 | |
---|
| 610 | if (this.extractStyles) { |
---|
| 611 | // Make sure that <Style> nodes within a placemark are |
---|
| 612 | // processed as well |
---|
| 613 | var inlineStyleNode = this.getElementsByTagNameNS(featureNode, |
---|
| 614 | "*", |
---|
| 615 | "Style")[0]; |
---|
| 616 | if (inlineStyleNode) { |
---|
| 617 | var inlineStyle= this.parseStyle(inlineStyleNode); |
---|
| 618 | if (inlineStyle) { |
---|
| 619 | feature.style = OpenLayers.Util.extend( |
---|
| 620 | feature.style, inlineStyle |
---|
| 621 | ); |
---|
| 622 | } |
---|
| 623 | } |
---|
| 624 | } |
---|
| 625 | |
---|
| 626 | // check if gx:Track elements should be parsed |
---|
| 627 | if (this.extractTracks) { |
---|
| 628 | var tracks = this.getElementsByTagNameNS( |
---|
| 629 | featureNode, this.namespaces.gx, "Track" |
---|
| 630 | ); |
---|
| 631 | if (tracks && tracks.length > 0) { |
---|
| 632 | var track = tracks[0]; |
---|
| 633 | var container = { |
---|
| 634 | features: [], |
---|
| 635 | feature: feature |
---|
| 636 | }; |
---|
| 637 | this.readNode(track, container); |
---|
| 638 | if (container.features.length > 0) { |
---|
| 639 | features.push.apply(features, container.features); |
---|
| 640 | } |
---|
| 641 | } |
---|
| 642 | } else { |
---|
| 643 | // add feature to list of features |
---|
| 644 | features.push(feature); |
---|
| 645 | } |
---|
| 646 | } else { |
---|
| 647 | throw "Bad Placemark: " + i; |
---|
| 648 | } |
---|
| 649 | } |
---|
| 650 | |
---|
| 651 | // add new features to existing feature list |
---|
| 652 | this.features = this.features.concat(features); |
---|
| 653 | }, |
---|
| 654 | |
---|
| 655 | /** |
---|
| 656 | * Property: readers |
---|
| 657 | * Contains public functions, grouped by namespace prefix, that will |
---|
| 658 | * be applied when a namespaced node is found matching the function |
---|
| 659 | * name. The function will be applied in the scope of this parser |
---|
| 660 | * with two arguments: the node being read and a context object passed |
---|
| 661 | * from the parent. |
---|
| 662 | */ |
---|
| 663 | readers: { |
---|
| 664 | "kml": { |
---|
| 665 | "when": function(node, container) { |
---|
| 666 | container.whens.push(OpenLayers.Date.parse( |
---|
| 667 | this.getChildValue(node) |
---|
| 668 | )); |
---|
| 669 | }, |
---|
| 670 | "_trackPointAttribute": function(node, container) { |
---|
| 671 | var name = node.nodeName.split(":").pop(); |
---|
| 672 | container.attributes[name].push(this.getChildValue(node)); |
---|
| 673 | } |
---|
| 674 | }, |
---|
| 675 | "gx": { |
---|
| 676 | "Track": function(node, container) { |
---|
| 677 | var obj = { |
---|
| 678 | whens: [], |
---|
| 679 | points: [], |
---|
| 680 | angles: [] |
---|
| 681 | }; |
---|
| 682 | if (this.trackAttributes) { |
---|
| 683 | var name; |
---|
| 684 | obj.attributes = {}; |
---|
| 685 | for (var i=0, ii=this.trackAttributes.length; i<ii; ++i) { |
---|
| 686 | name = this.trackAttributes[i]; |
---|
| 687 | obj.attributes[name] = []; |
---|
| 688 | if (!(name in this.readers.kml)) { |
---|
| 689 | this.readers.kml[name] = this.readers.kml._trackPointAttribute; |
---|
| 690 | } |
---|
| 691 | } |
---|
| 692 | } |
---|
| 693 | this.readChildNodes(node, obj); |
---|
| 694 | if (obj.whens.length !== obj.points.length) { |
---|
| 695 | throw new Error("gx:Track with unequal number of when (" + obj.whens.length + ") and gx:coord (" + obj.points.length + ") elements."); |
---|
| 696 | } |
---|
| 697 | var hasAngles = obj.angles.length > 0; |
---|
| 698 | if (hasAngles && obj.whens.length !== obj.angles.length) { |
---|
| 699 | throw new Error("gx:Track with unequal number of when (" + obj.whens.length + ") and gx:angles (" + obj.angles.length + ") elements."); |
---|
| 700 | } |
---|
| 701 | var feature, point, angles; |
---|
| 702 | for (var i=0, ii=obj.whens.length; i<ii; ++i) { |
---|
| 703 | feature = container.feature.clone(); |
---|
| 704 | feature.fid = container.feature.fid || container.feature.id; |
---|
| 705 | point = obj.points[i]; |
---|
| 706 | feature.geometry = point; |
---|
| 707 | if ("z" in point) { |
---|
| 708 | feature.attributes.altitude = point.z; |
---|
| 709 | } |
---|
| 710 | if (this.internalProjection && this.externalProjection) { |
---|
| 711 | feature.geometry.transform( |
---|
| 712 | this.externalProjection, this.internalProjection |
---|
| 713 | ); |
---|
| 714 | } |
---|
| 715 | if (this.trackAttributes) { |
---|
| 716 | for (var j=0, jj=this.trackAttributes.length; j<jj; ++j) { |
---|
| 717 | feature.attributes[name] = obj.attributes[this.trackAttributes[j]][i]; |
---|
| 718 | } |
---|
| 719 | } |
---|
| 720 | feature.attributes.when = obj.whens[i]; |
---|
| 721 | feature.attributes.trackId = container.feature.id; |
---|
| 722 | if (hasAngles) { |
---|
| 723 | angles = obj.angles[i]; |
---|
| 724 | feature.attributes.heading = parseFloat(angles[0]); |
---|
| 725 | feature.attributes.tilt = parseFloat(angles[1]); |
---|
| 726 | feature.attributes.roll = parseFloat(angles[2]); |
---|
| 727 | } |
---|
| 728 | container.features.push(feature); |
---|
| 729 | } |
---|
| 730 | }, |
---|
| 731 | "coord": function(node, container) { |
---|
| 732 | var str = this.getChildValue(node); |
---|
| 733 | var coords = str.replace(this.regExes.trimSpace, "").split(/\s+/); |
---|
| 734 | var point = new OpenLayers.Geometry.Point(coords[0], coords[1]); |
---|
| 735 | if (coords.length > 2) { |
---|
| 736 | point.z = parseFloat(coords[2]); |
---|
| 737 | } |
---|
| 738 | container.points.push(point); |
---|
| 739 | }, |
---|
| 740 | "angles": function(node, container) { |
---|
| 741 | var str = this.getChildValue(node); |
---|
| 742 | var parts = str.replace(this.regExes.trimSpace, "").split(/\s+/); |
---|
| 743 | container.angles.push(parts); |
---|
| 744 | } |
---|
| 745 | } |
---|
| 746 | }, |
---|
| 747 | |
---|
| 748 | /** |
---|
| 749 | * Method: parseFeature |
---|
| 750 | * This function is the core of the KML parsing code in OpenLayers. |
---|
| 751 | * It creates the geometries that are then attached to the returned |
---|
| 752 | * feature, and calls parseAttributes() to get attribute data out. |
---|
| 753 | * |
---|
| 754 | * Parameters: |
---|
| 755 | * node - {DOMElement} |
---|
| 756 | * |
---|
| 757 | * Returns: |
---|
| 758 | * {<OpenLayers.Feature.Vector>} A vector feature. |
---|
| 759 | */ |
---|
| 760 | parseFeature: function(node) { |
---|
| 761 | // only accept one geometry per feature - look for highest "order" |
---|
| 762 | var order = ["MultiGeometry", "Polygon", "LineString", "Point"]; |
---|
| 763 | var type, nodeList, geometry, parser; |
---|
| 764 | for(var i=0, len=order.length; i<len; ++i) { |
---|
| 765 | type = order[i]; |
---|
| 766 | this.internalns = node.namespaceURI ? |
---|
| 767 | node.namespaceURI : this.kmlns; |
---|
| 768 | nodeList = this.getElementsByTagNameNS(node, |
---|
| 769 | this.internalns, type); |
---|
| 770 | if(nodeList.length > 0) { |
---|
| 771 | // only deal with first geometry of this type |
---|
| 772 | var parser = this.parseGeometry[type.toLowerCase()]; |
---|
| 773 | if(parser) { |
---|
| 774 | geometry = parser.apply(this, [nodeList[0]]); |
---|
| 775 | if (this.internalProjection && this.externalProjection) { |
---|
| 776 | geometry.transform(this.externalProjection, |
---|
| 777 | this.internalProjection); |
---|
| 778 | } |
---|
| 779 | } else { |
---|
| 780 | OpenLayers.Console.error(OpenLayers.i18n( |
---|
| 781 | "unsupportedGeometryType", {'geomType':type})); |
---|
| 782 | } |
---|
| 783 | // stop looking for different geometry types |
---|
| 784 | break; |
---|
| 785 | } |
---|
| 786 | } |
---|
| 787 | |
---|
| 788 | // construct feature (optionally with attributes) |
---|
| 789 | var attributes; |
---|
| 790 | if(this.extractAttributes) { |
---|
| 791 | attributes = this.parseAttributes(node); |
---|
| 792 | } |
---|
| 793 | var feature = new OpenLayers.Feature.Vector(geometry, attributes); |
---|
| 794 | |
---|
| 795 | var fid = node.getAttribute("id") || node.getAttribute("name"); |
---|
| 796 | if(fid != null) { |
---|
| 797 | feature.fid = fid; |
---|
| 798 | } |
---|
| 799 | |
---|
| 800 | return feature; |
---|
| 801 | }, |
---|
| 802 | |
---|
| 803 | /** |
---|
| 804 | * Method: getStyle |
---|
| 805 | * Retrieves a style from a style hash using styleUrl as the key |
---|
| 806 | * If the styleUrl doesn't exist yet, we try to fetch it |
---|
| 807 | * Internet |
---|
| 808 | * |
---|
| 809 | * Parameters: |
---|
| 810 | * styleUrl - {String} URL of style |
---|
| 811 | * options - {Object} Hash of options |
---|
| 812 | * |
---|
| 813 | * Returns: |
---|
| 814 | * {Object} - (reference to) Style hash |
---|
| 815 | */ |
---|
| 816 | getStyle: function(styleUrl, options) { |
---|
| 817 | |
---|
| 818 | var styleBaseUrl = OpenLayers.Util.removeTail(styleUrl); |
---|
| 819 | |
---|
| 820 | var newOptions = OpenLayers.Util.extend({}, options); |
---|
| 821 | newOptions.depth++; |
---|
| 822 | newOptions.styleBaseUrl = styleBaseUrl; |
---|
| 823 | |
---|
| 824 | // Fetch remote Style URLs (if not fetched before) |
---|
| 825 | if (!this.styles[styleUrl] |
---|
| 826 | && !OpenLayers.String.startsWith(styleUrl, "#") |
---|
| 827 | && newOptions.depth <= this.maxDepth |
---|
| 828 | && !this.fetched[styleBaseUrl] ) { |
---|
| 829 | |
---|
| 830 | var data = this.fetchLink(styleBaseUrl); |
---|
| 831 | if (data) { |
---|
| 832 | this.parseData(data, newOptions); |
---|
| 833 | } |
---|
| 834 | |
---|
| 835 | } |
---|
| 836 | |
---|
| 837 | // return requested style |
---|
| 838 | var style = OpenLayers.Util.extend({}, this.styles[styleUrl]); |
---|
| 839 | return style; |
---|
| 840 | }, |
---|
| 841 | |
---|
| 842 | /** |
---|
| 843 | * Property: parseGeometry |
---|
| 844 | * Properties of this object are the functions that parse geometries based |
---|
| 845 | * on their type. |
---|
| 846 | */ |
---|
| 847 | parseGeometry: { |
---|
| 848 | |
---|
| 849 | /** |
---|
| 850 | * Method: parseGeometry.point |
---|
| 851 | * Given a KML node representing a point geometry, create an OpenLayers |
---|
| 852 | * point geometry. |
---|
| 853 | * |
---|
| 854 | * Parameters: |
---|
| 855 | * node - {DOMElement} A KML Point node. |
---|
| 856 | * |
---|
| 857 | * Returns: |
---|
| 858 | * {<OpenLayers.Geometry.Point>} A point geometry. |
---|
| 859 | */ |
---|
| 860 | point: function(node) { |
---|
| 861 | var nodeList = this.getElementsByTagNameNS(node, this.internalns, |
---|
| 862 | "coordinates"); |
---|
| 863 | var coords = []; |
---|
| 864 | if(nodeList.length > 0) { |
---|
| 865 | var coordString = nodeList[0].firstChild.nodeValue; |
---|
| 866 | coordString = coordString.replace(this.regExes.removeSpace, ""); |
---|
| 867 | coords = coordString.split(","); |
---|
| 868 | } |
---|
| 869 | |
---|
| 870 | var point = null; |
---|
| 871 | if(coords.length > 1) { |
---|
| 872 | // preserve third dimension |
---|
| 873 | if(coords.length == 2) { |
---|
| 874 | coords[2] = null; |
---|
| 875 | } |
---|
| 876 | point = new OpenLayers.Geometry.Point(coords[0], coords[1], |
---|
| 877 | coords[2]); |
---|
| 878 | } else { |
---|
| 879 | throw "Bad coordinate string: " + coordString; |
---|
| 880 | } |
---|
| 881 | return point; |
---|
| 882 | }, |
---|
| 883 | |
---|
| 884 | /** |
---|
| 885 | * Method: parseGeometry.linestring |
---|
| 886 | * Given a KML node representing a linestring geometry, create an |
---|
| 887 | * OpenLayers linestring geometry. |
---|
| 888 | * |
---|
| 889 | * Parameters: |
---|
| 890 | * node - {DOMElement} A KML LineString node. |
---|
| 891 | * |
---|
| 892 | * Returns: |
---|
| 893 | * {<OpenLayers.Geometry.LineString>} A linestring geometry. |
---|
| 894 | */ |
---|
| 895 | linestring: function(node, ring) { |
---|
| 896 | var nodeList = this.getElementsByTagNameNS(node, this.internalns, |
---|
| 897 | "coordinates"); |
---|
| 898 | var line = null; |
---|
| 899 | if(nodeList.length > 0) { |
---|
| 900 | var coordString = this.getChildValue(nodeList[0]); |
---|
| 901 | |
---|
| 902 | coordString = coordString.replace(this.regExes.trimSpace, |
---|
| 903 | ""); |
---|
| 904 | coordString = coordString.replace(this.regExes.trimComma, |
---|
| 905 | ","); |
---|
| 906 | var pointList = coordString.split(this.regExes.splitSpace); |
---|
| 907 | var numPoints = pointList.length; |
---|
| 908 | var points = new Array(numPoints); |
---|
| 909 | var coords, numCoords; |
---|
| 910 | for(var i=0; i<numPoints; ++i) { |
---|
| 911 | coords = pointList[i].split(","); |
---|
| 912 | numCoords = coords.length; |
---|
| 913 | if(numCoords > 1) { |
---|
| 914 | if(coords.length == 2) { |
---|
| 915 | coords[2] = null; |
---|
| 916 | } |
---|
| 917 | points[i] = new OpenLayers.Geometry.Point(coords[0], |
---|
| 918 | coords[1], |
---|
| 919 | coords[2]); |
---|
| 920 | } else { |
---|
| 921 | throw "Bad LineString point coordinates: " + |
---|
| 922 | pointList[i]; |
---|
| 923 | } |
---|
| 924 | } |
---|
| 925 | if(numPoints) { |
---|
| 926 | if(ring) { |
---|
| 927 | line = new OpenLayers.Geometry.LinearRing(points); |
---|
| 928 | } else { |
---|
| 929 | line = new OpenLayers.Geometry.LineString(points); |
---|
| 930 | } |
---|
| 931 | } else { |
---|
| 932 | throw "Bad LineString coordinates: " + coordString; |
---|
| 933 | } |
---|
| 934 | } |
---|
| 935 | |
---|
| 936 | return line; |
---|
| 937 | }, |
---|
| 938 | |
---|
| 939 | /** |
---|
| 940 | * Method: parseGeometry.polygon |
---|
| 941 | * Given a KML node representing a polygon geometry, create an |
---|
| 942 | * OpenLayers polygon geometry. |
---|
| 943 | * |
---|
| 944 | * Parameters: |
---|
| 945 | * node - {DOMElement} A KML Polygon node. |
---|
| 946 | * |
---|
| 947 | * Returns: |
---|
| 948 | * {<OpenLayers.Geometry.Polygon>} A polygon geometry. |
---|
| 949 | */ |
---|
| 950 | polygon: function(node) { |
---|
| 951 | var nodeList = this.getElementsByTagNameNS(node, this.internalns, |
---|
| 952 | "LinearRing"); |
---|
| 953 | var numRings = nodeList.length; |
---|
| 954 | var components = new Array(numRings); |
---|
| 955 | if(numRings > 0) { |
---|
| 956 | // this assumes exterior ring first, inner rings after |
---|
| 957 | var ring; |
---|
| 958 | for(var i=0, len=nodeList.length; i<len; ++i) { |
---|
| 959 | ring = this.parseGeometry.linestring.apply(this, |
---|
| 960 | [nodeList[i], true]); |
---|
| 961 | if(ring) { |
---|
| 962 | components[i] = ring; |
---|
| 963 | } else { |
---|
| 964 | throw "Bad LinearRing geometry: " + i; |
---|
| 965 | } |
---|
| 966 | } |
---|
| 967 | } |
---|
| 968 | return new OpenLayers.Geometry.Polygon(components); |
---|
| 969 | }, |
---|
| 970 | |
---|
| 971 | /** |
---|
| 972 | * Method: parseGeometry.multigeometry |
---|
| 973 | * Given a KML node representing a multigeometry, create an |
---|
| 974 | * OpenLayers geometry collection. |
---|
| 975 | * |
---|
| 976 | * Parameters: |
---|
| 977 | * node - {DOMElement} A KML MultiGeometry node. |
---|
| 978 | * |
---|
| 979 | * Returns: |
---|
| 980 | * {<OpenLayers.Geometry.Collection>} A geometry collection. |
---|
| 981 | */ |
---|
| 982 | multigeometry: function(node) { |
---|
| 983 | var child, parser; |
---|
| 984 | var parts = []; |
---|
| 985 | var children = node.childNodes; |
---|
| 986 | for(var i=0, len=children.length; i<len; ++i ) { |
---|
| 987 | child = children[i]; |
---|
| 988 | if(child.nodeType == 1) { |
---|
| 989 | var type = (child.prefix) ? |
---|
| 990 | child.nodeName.split(":")[1] : |
---|
| 991 | child.nodeName; |
---|
| 992 | var parser = this.parseGeometry[type.toLowerCase()]; |
---|
| 993 | if(parser) { |
---|
| 994 | parts.push(parser.apply(this, [child])); |
---|
| 995 | } |
---|
| 996 | } |
---|
| 997 | } |
---|
| 998 | return new OpenLayers.Geometry.Collection(parts); |
---|
| 999 | } |
---|
| 1000 | |
---|
| 1001 | }, |
---|
| 1002 | |
---|
| 1003 | /** |
---|
| 1004 | * Method: parseAttributes |
---|
| 1005 | * |
---|
| 1006 | * Parameters: |
---|
| 1007 | * node - {DOMElement} |
---|
| 1008 | * |
---|
| 1009 | * Returns: |
---|
| 1010 | * {Object} An attributes object. |
---|
| 1011 | */ |
---|
| 1012 | parseAttributes: function(node) { |
---|
| 1013 | var attributes = {}; |
---|
| 1014 | |
---|
| 1015 | // Extended Data is parsed first. |
---|
| 1016 | var edNodes = node.getElementsByTagName("ExtendedData"); |
---|
| 1017 | if (edNodes.length) { |
---|
| 1018 | attributes = this.parseExtendedData(edNodes[0]); |
---|
| 1019 | } |
---|
| 1020 | |
---|
| 1021 | // assume attribute nodes are type 1 children with a type 3 or 4 child |
---|
| 1022 | var child, grandchildren, grandchild; |
---|
| 1023 | var children = node.childNodes; |
---|
| 1024 | |
---|
| 1025 | for(var i=0, len=children.length; i<len; ++i) { |
---|
| 1026 | child = children[i]; |
---|
| 1027 | if(child.nodeType == 1) { |
---|
| 1028 | grandchildren = child.childNodes; |
---|
| 1029 | if(grandchildren.length >= 1 && grandchildren.length <= 3) { |
---|
| 1030 | var grandchild; |
---|
| 1031 | switch (grandchildren.length) { |
---|
| 1032 | case 1: |
---|
| 1033 | grandchild = grandchildren[0]; |
---|
| 1034 | break; |
---|
| 1035 | case 2: |
---|
| 1036 | var c1 = grandchildren[0]; |
---|
| 1037 | var c2 = grandchildren[1]; |
---|
| 1038 | grandchild = (c1.nodeType == 3 || c1.nodeType == 4) ? |
---|
| 1039 | c1 : c2; |
---|
| 1040 | break; |
---|
| 1041 | case 3: |
---|
| 1042 | default: |
---|
| 1043 | grandchild = grandchildren[1]; |
---|
| 1044 | break; |
---|
| 1045 | } |
---|
| 1046 | if(grandchild.nodeType == 3 || grandchild.nodeType == 4) { |
---|
| 1047 | var name = (child.prefix) ? |
---|
| 1048 | child.nodeName.split(":")[1] : |
---|
| 1049 | child.nodeName; |
---|
| 1050 | var value = OpenLayers.Util.getXmlNodeValue(grandchild); |
---|
| 1051 | if (value) { |
---|
| 1052 | value = value.replace(this.regExes.trimSpace, ""); |
---|
| 1053 | attributes[name] = value; |
---|
| 1054 | } |
---|
| 1055 | } |
---|
| 1056 | } |
---|
| 1057 | } |
---|
| 1058 | } |
---|
| 1059 | return attributes; |
---|
| 1060 | }, |
---|
| 1061 | |
---|
| 1062 | /** |
---|
| 1063 | * Method: parseExtendedData |
---|
| 1064 | * Parse ExtendedData from KML. Limited support for schemas/datatypes. |
---|
| 1065 | * See http://code.google.com/apis/kml/documentation/kmlreference.html#extendeddata |
---|
| 1066 | * for more information on extendeddata. |
---|
| 1067 | */ |
---|
| 1068 | parseExtendedData: function(node) { |
---|
| 1069 | var attributes = {}; |
---|
| 1070 | var i, len, data, key; |
---|
| 1071 | var dataNodes = node.getElementsByTagName("Data"); |
---|
| 1072 | for (i = 0, len = dataNodes.length; i < len; i++) { |
---|
| 1073 | data = dataNodes[i]; |
---|
| 1074 | key = data.getAttribute("name"); |
---|
| 1075 | var ed = {}; |
---|
| 1076 | var valueNode = data.getElementsByTagName("value"); |
---|
| 1077 | if (valueNode.length) { |
---|
| 1078 | ed['value'] = this.getChildValue(valueNode[0]); |
---|
| 1079 | } |
---|
| 1080 | var nameNode = data.getElementsByTagName("displayName"); |
---|
| 1081 | if (nameNode.length) { |
---|
| 1082 | ed['displayName'] = this.getChildValue(nameNode[0]); |
---|
| 1083 | } |
---|
| 1084 | attributes[key] = ed; |
---|
| 1085 | } |
---|
| 1086 | var simpleDataNodes = node.getElementsByTagName("SimpleData"); |
---|
| 1087 | for (i = 0, len = simpleDataNodes.length; i < len; i++) { |
---|
| 1088 | var ed = {}; |
---|
| 1089 | data = simpleDataNodes[i]; |
---|
| 1090 | key = data.getAttribute("name"); |
---|
| 1091 | ed['value'] = this.getChildValue(data); |
---|
| 1092 | ed['displayName'] = key; |
---|
| 1093 | attributes[key] = ed; |
---|
| 1094 | } |
---|
| 1095 | |
---|
| 1096 | return attributes; |
---|
| 1097 | }, |
---|
| 1098 | |
---|
| 1099 | /** |
---|
| 1100 | * Method: parseProperty |
---|
| 1101 | * Convenience method to find a node and return its value |
---|
| 1102 | * |
---|
| 1103 | * Parameters: |
---|
| 1104 | * xmlNode - {<DOMElement>} |
---|
| 1105 | * namespace - {String} namespace of the node to find |
---|
| 1106 | * tagName - {String} name of the property to parse |
---|
| 1107 | * |
---|
| 1108 | * Returns: |
---|
| 1109 | * {String} The value for the requested property (defaults to null) |
---|
| 1110 | */ |
---|
| 1111 | parseProperty: function(xmlNode, namespace, tagName) { |
---|
| 1112 | var value; |
---|
| 1113 | var nodeList = this.getElementsByTagNameNS(xmlNode, namespace, tagName); |
---|
| 1114 | try { |
---|
| 1115 | value = OpenLayers.Util.getXmlNodeValue(nodeList[0]); |
---|
| 1116 | } catch(e) { |
---|
| 1117 | value = null; |
---|
| 1118 | } |
---|
| 1119 | |
---|
| 1120 | return value; |
---|
| 1121 | }, |
---|
| 1122 | |
---|
| 1123 | /** |
---|
| 1124 | * APIMethod: write |
---|
| 1125 | * Accept Feature Collection, and return a string. |
---|
| 1126 | * |
---|
| 1127 | * Parameters: |
---|
| 1128 | * features - {Array(<OpenLayers.Feature.Vector>} An array of features. |
---|
| 1129 | * |
---|
| 1130 | * Returns: |
---|
| 1131 | * {String} A KML string. |
---|
| 1132 | */ |
---|
| 1133 | write: function(features) { |
---|
| 1134 | if(!(features instanceof Array)) { |
---|
| 1135 | features = [features]; |
---|
| 1136 | } |
---|
| 1137 | var kml = this.createElementNS(this.kmlns, "kml"); |
---|
| 1138 | var folder = this.createFolderXML(); |
---|
| 1139 | for(var i=0, len=features.length; i<len; ++i) { |
---|
| 1140 | folder.appendChild(this.createPlacemarkXML(features[i])); |
---|
| 1141 | } |
---|
| 1142 | kml.appendChild(folder); |
---|
| 1143 | return OpenLayers.Format.XML.prototype.write.apply(this, [kml]); |
---|
| 1144 | }, |
---|
| 1145 | |
---|
| 1146 | /** |
---|
| 1147 | * Method: createFolderXML |
---|
| 1148 | * Creates and returns a KML folder node |
---|
| 1149 | * |
---|
| 1150 | * Returns: |
---|
| 1151 | * {DOMElement} |
---|
| 1152 | */ |
---|
| 1153 | createFolderXML: function() { |
---|
| 1154 | // Folder |
---|
| 1155 | var folder = this.createElementNS(this.kmlns, "Folder"); |
---|
| 1156 | |
---|
| 1157 | // Folder name |
---|
| 1158 | if (this.foldersName) { |
---|
| 1159 | var folderName = this.createElementNS(this.kmlns, "name"); |
---|
| 1160 | var folderNameText = this.createTextNode(this.foldersName); |
---|
| 1161 | folderName.appendChild(folderNameText); |
---|
| 1162 | folder.appendChild(folderName); |
---|
| 1163 | } |
---|
| 1164 | |
---|
| 1165 | // Folder description |
---|
| 1166 | if (this.foldersDesc) { |
---|
| 1167 | var folderDesc = this.createElementNS(this.kmlns, "description"); |
---|
| 1168 | var folderDescText = this.createTextNode(this.foldersDesc); |
---|
| 1169 | folderDesc.appendChild(folderDescText); |
---|
| 1170 | folder.appendChild(folderDesc); |
---|
| 1171 | } |
---|
| 1172 | |
---|
| 1173 | return folder; |
---|
| 1174 | }, |
---|
| 1175 | |
---|
| 1176 | /** |
---|
| 1177 | * Method: createPlacemarkXML |
---|
| 1178 | * Creates and returns a KML placemark node representing the given feature. |
---|
| 1179 | * |
---|
| 1180 | * Parameters: |
---|
| 1181 | * feature - {<OpenLayers.Feature.Vector>} |
---|
| 1182 | * |
---|
| 1183 | * Returns: |
---|
| 1184 | * {DOMElement} |
---|
| 1185 | */ |
---|
| 1186 | createPlacemarkXML: function(feature) { |
---|
| 1187 | // Placemark name |
---|
| 1188 | var placemarkName = this.createElementNS(this.kmlns, "name"); |
---|
| 1189 | var name = feature.style && feature.style.label ? feature.style.label : |
---|
| 1190 | feature.attributes.name || feature.id; |
---|
| 1191 | placemarkName.appendChild(this.createTextNode(name)); |
---|
| 1192 | |
---|
| 1193 | // Placemark description |
---|
| 1194 | var placemarkDesc = this.createElementNS(this.kmlns, "description"); |
---|
| 1195 | var desc = feature.attributes.description || this.placemarksDesc; |
---|
| 1196 | placemarkDesc.appendChild(this.createTextNode(desc)); |
---|
| 1197 | |
---|
| 1198 | // Placemark |
---|
| 1199 | var placemarkNode = this.createElementNS(this.kmlns, "Placemark"); |
---|
| 1200 | if(feature.fid != null) { |
---|
| 1201 | placemarkNode.setAttribute("id", feature.fid); |
---|
| 1202 | } |
---|
| 1203 | placemarkNode.appendChild(placemarkName); |
---|
| 1204 | placemarkNode.appendChild(placemarkDesc); |
---|
| 1205 | |
---|
| 1206 | // Geometry node (Point, LineString, etc. nodes) |
---|
| 1207 | var geometryNode = this.buildGeometryNode(feature.geometry); |
---|
| 1208 | placemarkNode.appendChild(geometryNode); |
---|
| 1209 | |
---|
| 1210 | // TBD - deal with remaining (non name/description) attributes. |
---|
| 1211 | return placemarkNode; |
---|
| 1212 | }, |
---|
| 1213 | |
---|
| 1214 | /** |
---|
| 1215 | * Method: buildGeometryNode |
---|
| 1216 | * Builds and returns a KML geometry node with the given geometry. |
---|
| 1217 | * |
---|
| 1218 | * Parameters: |
---|
| 1219 | * geometry - {<OpenLayers.Geometry>} |
---|
| 1220 | * |
---|
| 1221 | * Returns: |
---|
| 1222 | * {DOMElement} |
---|
| 1223 | */ |
---|
| 1224 | buildGeometryNode: function(geometry) { |
---|
| 1225 | if (this.internalProjection && this.externalProjection) { |
---|
| 1226 | geometry = geometry.clone(); |
---|
| 1227 | geometry.transform(this.internalProjection, |
---|
| 1228 | this.externalProjection); |
---|
| 1229 | } |
---|
| 1230 | var className = geometry.CLASS_NAME; |
---|
| 1231 | var type = className.substring(className.lastIndexOf(".") + 1); |
---|
| 1232 | var builder = this.buildGeometry[type.toLowerCase()]; |
---|
| 1233 | var node = null; |
---|
| 1234 | if(builder) { |
---|
| 1235 | node = builder.apply(this, [geometry]); |
---|
| 1236 | } |
---|
| 1237 | return node; |
---|
| 1238 | }, |
---|
| 1239 | |
---|
| 1240 | /** |
---|
| 1241 | * Property: buildGeometry |
---|
| 1242 | * Object containing methods to do the actual geometry node building |
---|
| 1243 | * based on geometry type. |
---|
| 1244 | */ |
---|
| 1245 | buildGeometry: { |
---|
| 1246 | // TBD: Anybody care about namespace aliases here (these nodes have |
---|
| 1247 | // no prefixes)? |
---|
| 1248 | |
---|
| 1249 | /** |
---|
| 1250 | * Method: buildGeometry.point |
---|
| 1251 | * Given an OpenLayers point geometry, create a KML point. |
---|
| 1252 | * |
---|
| 1253 | * Parameters: |
---|
| 1254 | * geometry - {<OpenLayers.Geometry.Point>} A point geometry. |
---|
| 1255 | * |
---|
| 1256 | * Returns: |
---|
| 1257 | * {DOMElement} A KML point node. |
---|
| 1258 | */ |
---|
| 1259 | point: function(geometry) { |
---|
| 1260 | var kml = this.createElementNS(this.kmlns, "Point"); |
---|
| 1261 | kml.appendChild(this.buildCoordinatesNode(geometry)); |
---|
| 1262 | return kml; |
---|
| 1263 | }, |
---|
| 1264 | |
---|
| 1265 | /** |
---|
| 1266 | * Method: buildGeometry.multipoint |
---|
| 1267 | * Given an OpenLayers multipoint geometry, create a KML |
---|
| 1268 | * GeometryCollection. |
---|
| 1269 | * |
---|
| 1270 | * Parameters: |
---|
| 1271 | * geometry - {<OpenLayers.Geometry.Point>} A multipoint geometry. |
---|
| 1272 | * |
---|
| 1273 | * Returns: |
---|
| 1274 | * {DOMElement} A KML GeometryCollection node. |
---|
| 1275 | */ |
---|
| 1276 | multipoint: function(geometry) { |
---|
| 1277 | return this.buildGeometry.collection.apply(this, [geometry]); |
---|
| 1278 | }, |
---|
| 1279 | |
---|
| 1280 | /** |
---|
| 1281 | * Method: buildGeometry.linestring |
---|
| 1282 | * Given an OpenLayers linestring geometry, create a KML linestring. |
---|
| 1283 | * |
---|
| 1284 | * Parameters: |
---|
| 1285 | * geometry - {<OpenLayers.Geometry.LineString>} A linestring geometry. |
---|
| 1286 | * |
---|
| 1287 | * Returns: |
---|
| 1288 | * {DOMElement} A KML linestring node. |
---|
| 1289 | */ |
---|
| 1290 | linestring: function(geometry) { |
---|
| 1291 | var kml = this.createElementNS(this.kmlns, "LineString"); |
---|
| 1292 | kml.appendChild(this.buildCoordinatesNode(geometry)); |
---|
| 1293 | return kml; |
---|
| 1294 | }, |
---|
| 1295 | |
---|
| 1296 | /** |
---|
| 1297 | * Method: buildGeometry.multilinestring |
---|
| 1298 | * Given an OpenLayers multilinestring geometry, create a KML |
---|
| 1299 | * GeometryCollection. |
---|
| 1300 | * |
---|
| 1301 | * Parameters: |
---|
| 1302 | * geometry - {<OpenLayers.Geometry.Point>} A multilinestring geometry. |
---|
| 1303 | * |
---|
| 1304 | * Returns: |
---|
| 1305 | * {DOMElement} A KML GeometryCollection node. |
---|
| 1306 | */ |
---|
| 1307 | multilinestring: function(geometry) { |
---|
| 1308 | return this.buildGeometry.collection.apply(this, [geometry]); |
---|
| 1309 | }, |
---|
| 1310 | |
---|
| 1311 | /** |
---|
| 1312 | * Method: buildGeometry.linearring |
---|
| 1313 | * Given an OpenLayers linearring geometry, create a KML linearring. |
---|
| 1314 | * |
---|
| 1315 | * Parameters: |
---|
| 1316 | * geometry - {<OpenLayers.Geometry.LinearRing>} A linearring geometry. |
---|
| 1317 | * |
---|
| 1318 | * Returns: |
---|
| 1319 | * {DOMElement} A KML linearring node. |
---|
| 1320 | */ |
---|
| 1321 | linearring: function(geometry) { |
---|
| 1322 | var kml = this.createElementNS(this.kmlns, "LinearRing"); |
---|
| 1323 | kml.appendChild(this.buildCoordinatesNode(geometry)); |
---|
| 1324 | return kml; |
---|
| 1325 | }, |
---|
| 1326 | |
---|
| 1327 | /** |
---|
| 1328 | * Method: buildGeometry.polygon |
---|
| 1329 | * Given an OpenLayers polygon geometry, create a KML polygon. |
---|
| 1330 | * |
---|
| 1331 | * Parameters: |
---|
| 1332 | * geometry - {<OpenLayers.Geometry.Polygon>} A polygon geometry. |
---|
| 1333 | * |
---|
| 1334 | * Returns: |
---|
| 1335 | * {DOMElement} A KML polygon node. |
---|
| 1336 | */ |
---|
| 1337 | polygon: function(geometry) { |
---|
| 1338 | var kml = this.createElementNS(this.kmlns, "Polygon"); |
---|
| 1339 | var rings = geometry.components; |
---|
| 1340 | var ringMember, ringGeom, type; |
---|
| 1341 | for(var i=0, len=rings.length; i<len; ++i) { |
---|
| 1342 | type = (i==0) ? "outerBoundaryIs" : "innerBoundaryIs"; |
---|
| 1343 | ringMember = this.createElementNS(this.kmlns, type); |
---|
| 1344 | ringGeom = this.buildGeometry.linearring.apply(this, |
---|
| 1345 | [rings[i]]); |
---|
| 1346 | ringMember.appendChild(ringGeom); |
---|
| 1347 | kml.appendChild(ringMember); |
---|
| 1348 | } |
---|
| 1349 | return kml; |
---|
| 1350 | }, |
---|
| 1351 | |
---|
| 1352 | /** |
---|
| 1353 | * Method: buildGeometry.multipolygon |
---|
| 1354 | * Given an OpenLayers multipolygon geometry, create a KML |
---|
| 1355 | * GeometryCollection. |
---|
| 1356 | * |
---|
| 1357 | * Parameters: |
---|
| 1358 | * geometry - {<OpenLayers.Geometry.Point>} A multipolygon geometry. |
---|
| 1359 | * |
---|
| 1360 | * Returns: |
---|
| 1361 | * {DOMElement} A KML GeometryCollection node. |
---|
| 1362 | */ |
---|
| 1363 | multipolygon: function(geometry) { |
---|
| 1364 | return this.buildGeometry.collection.apply(this, [geometry]); |
---|
| 1365 | }, |
---|
| 1366 | |
---|
| 1367 | /** |
---|
| 1368 | * Method: buildGeometry.collection |
---|
| 1369 | * Given an OpenLayers geometry collection, create a KML MultiGeometry. |
---|
| 1370 | * |
---|
| 1371 | * Parameters: |
---|
| 1372 | * geometry - {<OpenLayers.Geometry.Collection>} A geometry collection. |
---|
| 1373 | * |
---|
| 1374 | * Returns: |
---|
| 1375 | * {DOMElement} A KML MultiGeometry node. |
---|
| 1376 | */ |
---|
| 1377 | collection: function(geometry) { |
---|
| 1378 | var kml = this.createElementNS(this.kmlns, "MultiGeometry"); |
---|
| 1379 | var child; |
---|
| 1380 | for(var i=0, len=geometry.components.length; i<len; ++i) { |
---|
| 1381 | child = this.buildGeometryNode.apply(this, |
---|
| 1382 | [geometry.components[i]]); |
---|
| 1383 | if(child) { |
---|
| 1384 | kml.appendChild(child); |
---|
| 1385 | } |
---|
| 1386 | } |
---|
| 1387 | return kml; |
---|
| 1388 | } |
---|
| 1389 | }, |
---|
| 1390 | |
---|
| 1391 | /** |
---|
| 1392 | * Method: buildCoordinatesNode |
---|
| 1393 | * Builds and returns the KML coordinates node with the given geometry |
---|
| 1394 | * <coordinates>...</coordinates> |
---|
| 1395 | * |
---|
| 1396 | * Parameters: |
---|
| 1397 | * geometry - {<OpenLayers.Geometry>} |
---|
| 1398 | * |
---|
| 1399 | * Return: |
---|
| 1400 | * {DOMElement} |
---|
| 1401 | */ |
---|
| 1402 | buildCoordinatesNode: function(geometry) { |
---|
| 1403 | var coordinatesNode = this.createElementNS(this.kmlns, "coordinates"); |
---|
| 1404 | |
---|
| 1405 | var path; |
---|
| 1406 | var points = geometry.components; |
---|
| 1407 | if(points) { |
---|
| 1408 | // LineString or LinearRing |
---|
| 1409 | var point; |
---|
| 1410 | var numPoints = points.length; |
---|
| 1411 | var parts = new Array(numPoints); |
---|
| 1412 | for(var i=0; i<numPoints; ++i) { |
---|
| 1413 | point = points[i]; |
---|
| 1414 | parts[i] = point.x + "," + point.y; |
---|
| 1415 | } |
---|
| 1416 | path = parts.join(" "); |
---|
| 1417 | } else { |
---|
| 1418 | // Point |
---|
| 1419 | path = geometry.x + "," + geometry.y; |
---|
| 1420 | } |
---|
| 1421 | |
---|
| 1422 | var txtNode = this.createTextNode(path); |
---|
| 1423 | coordinatesNode.appendChild(txtNode); |
---|
| 1424 | |
---|
| 1425 | return coordinatesNode; |
---|
| 1426 | }, |
---|
| 1427 | |
---|
| 1428 | CLASS_NAME: "OpenLayers.Format.KML" |
---|
| 1429 | }); |
---|