[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/JSON.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/MultiPoint.js |
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| 11 | * @requires OpenLayers/Geometry/LineString.js |
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| 12 | * @requires OpenLayers/Geometry/MultiLineString.js |
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| 13 | * @requires OpenLayers/Geometry/Polygon.js |
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| 14 | * @requires OpenLayers/Geometry/MultiPolygon.js |
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| 15 | * @requires OpenLayers/Console.js |
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| 16 | */ |
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| 17 | |
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| 18 | /** |
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| 19 | * Class: OpenLayers.Format.GeoJSON |
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| 20 | * Read and write GeoJSON. Create a new parser with the |
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| 21 | * <OpenLayers.Format.GeoJSON> constructor. |
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| 22 | * |
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| 23 | * Inherits from: |
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| 24 | * - <OpenLayers.Format.JSON> |
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| 25 | */ |
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| 26 | OpenLayers.Format.GeoJSON = OpenLayers.Class(OpenLayers.Format.JSON, { |
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| 27 | |
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| 28 | /** |
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| 29 | * APIProperty: ignoreExtraDims |
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| 30 | * {Boolean} Ignore dimensions higher than 2 when reading geometry |
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| 31 | * coordinates. |
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| 32 | */ |
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| 33 | ignoreExtraDims: false, |
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| 34 | |
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| 35 | /** |
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| 36 | * Constructor: OpenLayers.Format.GeoJSON |
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| 37 | * Create a new parser for GeoJSON. |
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| 38 | * |
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| 39 | * Parameters: |
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| 40 | * options - {Object} An optional object whose properties will be set on |
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| 41 | * this instance. |
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| 42 | */ |
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| 43 | initialize: function(options) { |
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| 44 | OpenLayers.Format.JSON.prototype.initialize.apply(this, [options]); |
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| 45 | }, |
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| 46 | |
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| 47 | /** |
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| 48 | * APIMethod: read |
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| 49 | * Deserialize a GeoJSON string. |
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| 50 | * |
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| 51 | * Parameters: |
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| 52 | * json - {String} A GeoJSON string |
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| 53 | * type - {String} Optional string that determines the structure of |
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| 54 | * the output. Supported values are "Geometry", "Feature", and |
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| 55 | * "FeatureCollection". If absent or null, a default of |
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| 56 | * "FeatureCollection" is assumed. |
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| 57 | * filter - {Function} A function which will be called for every key and |
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| 58 | * value at every level of the final result. Each value will be |
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| 59 | * replaced by the result of the filter function. This can be used to |
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| 60 | * reform generic objects into instances of classes, or to transform |
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| 61 | * date strings into Date objects. |
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| 62 | * |
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| 63 | * Returns: |
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| 64 | * {Object} The return depends on the value of the type argument. If type |
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| 65 | * is "FeatureCollection" (the default), the return will be an array |
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| 66 | * of <OpenLayers.Feature.Vector>. If type is "Geometry", the input json |
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| 67 | * must represent a single geometry, and the return will be an |
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| 68 | * <OpenLayers.Geometry>. If type is "Feature", the input json must |
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| 69 | * represent a single feature, and the return will be an |
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| 70 | * <OpenLayers.Feature.Vector>. |
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| 71 | */ |
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| 72 | read: function(json, type, filter) { |
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| 73 | type = (type) ? type : "FeatureCollection"; |
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| 74 | var results = null; |
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| 75 | var obj = null; |
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| 76 | if (typeof json == "string") { |
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| 77 | obj = OpenLayers.Format.JSON.prototype.read.apply(this, |
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| 78 | [json, filter]); |
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| 79 | } else { |
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| 80 | obj = json; |
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| 81 | } |
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| 82 | if(!obj) { |
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| 83 | OpenLayers.Console.error("Bad JSON: " + json); |
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| 84 | } else if(typeof(obj.type) != "string") { |
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| 85 | OpenLayers.Console.error("Bad GeoJSON - no type: " + json); |
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| 86 | } else if(this.isValidType(obj, type)) { |
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| 87 | switch(type) { |
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| 88 | case "Geometry": |
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| 89 | try { |
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| 90 | results = this.parseGeometry(obj); |
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| 91 | } catch(err) { |
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| 92 | OpenLayers.Console.error(err); |
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| 93 | } |
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| 94 | break; |
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| 95 | case "Feature": |
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| 96 | try { |
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| 97 | results = this.parseFeature(obj); |
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| 98 | results.type = "Feature"; |
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| 99 | } catch(err) { |
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| 100 | OpenLayers.Console.error(err); |
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| 101 | } |
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| 102 | break; |
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| 103 | case "FeatureCollection": |
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| 104 | // for type FeatureCollection, we allow input to be any type |
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| 105 | results = []; |
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| 106 | switch(obj.type) { |
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| 107 | case "Feature": |
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| 108 | try { |
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| 109 | results.push(this.parseFeature(obj)); |
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| 110 | } catch(err) { |
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| 111 | results = null; |
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| 112 | OpenLayers.Console.error(err); |
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| 113 | } |
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| 114 | break; |
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| 115 | case "FeatureCollection": |
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| 116 | for(var i=0, len=obj.features.length; i<len; ++i) { |
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| 117 | try { |
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| 118 | results.push(this.parseFeature(obj.features[i])); |
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| 119 | } catch(err) { |
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| 120 | results = null; |
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| 121 | OpenLayers.Console.error(err); |
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| 122 | } |
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| 123 | } |
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| 124 | break; |
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| 125 | default: |
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| 126 | try { |
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| 127 | var geom = this.parseGeometry(obj); |
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| 128 | results.push(new OpenLayers.Feature.Vector(geom)); |
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| 129 | } catch(err) { |
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| 130 | results = null; |
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| 131 | OpenLayers.Console.error(err); |
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| 132 | } |
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| 133 | } |
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| 134 | break; |
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| 135 | } |
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| 136 | } |
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| 137 | return results; |
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| 138 | }, |
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| 139 | |
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| 140 | /** |
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| 141 | * Method: isValidType |
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| 142 | * Check if a GeoJSON object is a valid representative of the given type. |
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| 143 | * |
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| 144 | * Returns: |
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| 145 | * {Boolean} The object is valid GeoJSON object of the given type. |
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| 146 | */ |
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| 147 | isValidType: function(obj, type) { |
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| 148 | var valid = false; |
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| 149 | switch(type) { |
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| 150 | case "Geometry": |
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| 151 | if(OpenLayers.Util.indexOf( |
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| 152 | ["Point", "MultiPoint", "LineString", "MultiLineString", |
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| 153 | "Polygon", "MultiPolygon", "Box", "GeometryCollection"], |
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| 154 | obj.type) == -1) { |
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| 155 | // unsupported geometry type |
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| 156 | OpenLayers.Console.error("Unsupported geometry type: " + |
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| 157 | obj.type); |
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| 158 | } else { |
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| 159 | valid = true; |
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| 160 | } |
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| 161 | break; |
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| 162 | case "FeatureCollection": |
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| 163 | // allow for any type to be converted to a feature collection |
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| 164 | valid = true; |
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| 165 | break; |
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| 166 | default: |
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| 167 | // for Feature types must match |
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| 168 | if(obj.type == type) { |
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| 169 | valid = true; |
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| 170 | } else { |
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| 171 | OpenLayers.Console.error("Cannot convert types from " + |
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| 172 | obj.type + " to " + type); |
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| 173 | } |
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| 174 | } |
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| 175 | return valid; |
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| 176 | }, |
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| 177 | |
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| 178 | /** |
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| 179 | * Method: parseFeature |
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| 180 | * Convert a feature object from GeoJSON into an |
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| 181 | * <OpenLayers.Feature.Vector>. |
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| 182 | * |
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| 183 | * Parameters: |
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| 184 | * obj - {Object} An object created from a GeoJSON object |
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| 185 | * |
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| 186 | * Returns: |
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| 187 | * {<OpenLayers.Feature.Vector>} A feature. |
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| 188 | */ |
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| 189 | parseFeature: function(obj) { |
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| 190 | var feature, geometry, attributes, bbox; |
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| 191 | attributes = (obj.properties) ? obj.properties : {}; |
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| 192 | bbox = (obj.geometry && obj.geometry.bbox) || obj.bbox; |
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| 193 | try { |
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| 194 | geometry = this.parseGeometry(obj.geometry); |
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| 195 | } catch(err) { |
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| 196 | // deal with bad geometries |
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| 197 | throw err; |
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| 198 | } |
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| 199 | feature = new OpenLayers.Feature.Vector(geometry, attributes); |
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| 200 | if(bbox) { |
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| 201 | feature.bounds = OpenLayers.Bounds.fromArray(bbox); |
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| 202 | } |
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| 203 | if(obj.id) { |
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| 204 | feature.fid = obj.id; |
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| 205 | } |
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| 206 | return feature; |
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| 207 | }, |
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| 208 | |
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| 209 | /** |
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| 210 | * Method: parseGeometry |
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| 211 | * Convert a geometry object from GeoJSON into an <OpenLayers.Geometry>. |
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| 212 | * |
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| 213 | * Parameters: |
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| 214 | * obj - {Object} An object created from a GeoJSON object |
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| 215 | * |
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| 216 | * Returns: |
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| 217 | * {<OpenLayers.Geometry>} A geometry. |
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| 218 | */ |
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| 219 | parseGeometry: function(obj) { |
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| 220 | if (obj == null) { |
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| 221 | return null; |
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| 222 | } |
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| 223 | var geometry, collection = false; |
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| 224 | if(obj.type == "GeometryCollection") { |
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| 225 | if(!(obj.geometries instanceof Array)) { |
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| 226 | throw "GeometryCollection must have geometries array: " + obj; |
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| 227 | } |
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| 228 | var numGeom = obj.geometries.length; |
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| 229 | var components = new Array(numGeom); |
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| 230 | for(var i=0; i<numGeom; ++i) { |
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| 231 | components[i] = this.parseGeometry.apply( |
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| 232 | this, [obj.geometries[i]] |
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| 233 | ); |
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| 234 | } |
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| 235 | geometry = new OpenLayers.Geometry.Collection(components); |
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| 236 | collection = true; |
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| 237 | } else { |
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| 238 | if(!(obj.coordinates instanceof Array)) { |
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| 239 | throw "Geometry must have coordinates array: " + obj; |
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| 240 | } |
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| 241 | if(!this.parseCoords[obj.type.toLowerCase()]) { |
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| 242 | throw "Unsupported geometry type: " + obj.type; |
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| 243 | } |
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| 244 | try { |
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| 245 | geometry = this.parseCoords[obj.type.toLowerCase()].apply( |
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| 246 | this, [obj.coordinates] |
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| 247 | ); |
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| 248 | } catch(err) { |
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| 249 | // deal with bad coordinates |
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| 250 | throw err; |
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| 251 | } |
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| 252 | } |
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| 253 | // We don't reproject collections because the children are reprojected |
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| 254 | // for us when they are created. |
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| 255 | if (this.internalProjection && this.externalProjection && !collection) { |
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| 256 | geometry.transform(this.externalProjection, |
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| 257 | this.internalProjection); |
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| 258 | } |
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| 259 | return geometry; |
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| 260 | }, |
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| 261 | |
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| 262 | /** |
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| 263 | * Property: parseCoords |
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| 264 | * Object with properties corresponding to the GeoJSON geometry types. |
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| 265 | * Property values are functions that do the actual parsing. |
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| 266 | */ |
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| 267 | parseCoords: { |
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| 268 | /** |
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| 269 | * Method: parseCoords.point |
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| 270 | * Convert a coordinate array from GeoJSON into an |
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| 271 | * <OpenLayers.Geometry>. |
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| 272 | * |
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| 273 | * Parameters: |
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| 274 | * array - {Object} The coordinates array from the GeoJSON fragment. |
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| 275 | * |
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| 276 | * Returns: |
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| 277 | * {<OpenLayers.Geometry>} A geometry. |
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| 278 | */ |
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| 279 | "point": function(array) { |
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| 280 | if (this.ignoreExtraDims == false && |
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| 281 | array.length != 2) { |
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| 282 | throw "Only 2D points are supported: " + array; |
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| 283 | } |
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| 284 | return new OpenLayers.Geometry.Point(array[0], array[1]); |
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| 285 | }, |
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| 286 | |
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| 287 | /** |
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| 288 | * Method: parseCoords.multipoint |
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| 289 | * Convert a coordinate array from GeoJSON into an |
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| 290 | * <OpenLayers.Geometry>. |
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| 291 | * |
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| 292 | * Parameters: |
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| 293 | * array {Object} The coordinates array from the GeoJSON fragment. |
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| 294 | * |
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| 295 | * Returns: |
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| 296 | * {<OpenLayers.Geometry>} A geometry. |
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| 297 | */ |
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| 298 | "multipoint": function(array) { |
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| 299 | var points = []; |
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| 300 | var p = null; |
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| 301 | for(var i=0, len=array.length; i<len; ++i) { |
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| 302 | try { |
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| 303 | p = this.parseCoords["point"].apply(this, [array[i]]); |
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| 304 | } catch(err) { |
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| 305 | throw err; |
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| 306 | } |
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| 307 | points.push(p); |
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| 308 | } |
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| 309 | return new OpenLayers.Geometry.MultiPoint(points); |
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| 310 | }, |
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| 311 | |
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| 312 | /** |
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| 313 | * Method: parseCoords.linestring |
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| 314 | * Convert a coordinate array from GeoJSON into an |
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| 315 | * <OpenLayers.Geometry>. |
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| 316 | * |
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| 317 | * Parameters: |
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| 318 | * array - {Object} The coordinates array from the GeoJSON fragment. |
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| 319 | * |
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| 320 | * Returns: |
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| 321 | * {<OpenLayers.Geometry>} A geometry. |
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| 322 | */ |
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| 323 | "linestring": function(array) { |
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| 324 | var points = []; |
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| 325 | var p = null; |
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| 326 | for(var i=0, len=array.length; i<len; ++i) { |
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| 327 | try { |
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| 328 | p = this.parseCoords["point"].apply(this, [array[i]]); |
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| 329 | } catch(err) { |
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| 330 | throw err; |
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| 331 | } |
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| 332 | points.push(p); |
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| 333 | } |
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| 334 | return new OpenLayers.Geometry.LineString(points); |
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| 335 | }, |
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| 336 | |
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| 337 | /** |
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| 338 | * Method: parseCoords.multilinestring |
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| 339 | * Convert a coordinate array from GeoJSON into an |
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| 340 | * <OpenLayers.Geometry>. |
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| 341 | * |
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| 342 | * Parameters: |
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| 343 | * array - {Object} The coordinates array from the GeoJSON fragment. |
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| 344 | * |
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| 345 | * Returns: |
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| 346 | * {<OpenLayers.Geometry>} A geometry. |
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| 347 | */ |
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| 348 | "multilinestring": function(array) { |
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| 349 | var lines = []; |
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| 350 | var l = null; |
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| 351 | for(var i=0, len=array.length; i<len; ++i) { |
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| 352 | try { |
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| 353 | l = this.parseCoords["linestring"].apply(this, [array[i]]); |
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| 354 | } catch(err) { |
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| 355 | throw err; |
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| 356 | } |
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| 357 | lines.push(l); |
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| 358 | } |
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| 359 | return new OpenLayers.Geometry.MultiLineString(lines); |
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| 360 | }, |
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| 361 | |
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| 362 | /** |
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| 363 | * Method: parseCoords.polygon |
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| 364 | * Convert a coordinate array from GeoJSON into an |
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| 365 | * <OpenLayers.Geometry>. |
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| 366 | * |
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| 367 | * Returns: |
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| 368 | * {<OpenLayers.Geometry>} A geometry. |
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| 369 | */ |
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| 370 | "polygon": function(array) { |
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| 371 | var rings = []; |
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| 372 | var r, l; |
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| 373 | for(var i=0, len=array.length; i<len; ++i) { |
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| 374 | try { |
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| 375 | l = this.parseCoords["linestring"].apply(this, [array[i]]); |
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| 376 | } catch(err) { |
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| 377 | throw err; |
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| 378 | } |
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| 379 | r = new OpenLayers.Geometry.LinearRing(l.components); |
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| 380 | rings.push(r); |
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| 381 | } |
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| 382 | return new OpenLayers.Geometry.Polygon(rings); |
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| 383 | }, |
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| 384 | |
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| 385 | /** |
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| 386 | * Method: parseCoords.multipolygon |
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| 387 | * Convert a coordinate array from GeoJSON into an |
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| 388 | * <OpenLayers.Geometry>. |
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| 389 | * |
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| 390 | * Parameters: |
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| 391 | * array - {Object} The coordinates array from the GeoJSON fragment. |
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| 392 | * |
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| 393 | * Returns: |
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| 394 | * {<OpenLayers.Geometry>} A geometry. |
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| 395 | */ |
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| 396 | "multipolygon": function(array) { |
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| 397 | var polys = []; |
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| 398 | var p = null; |
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| 399 | for(var i=0, len=array.length; i<len; ++i) { |
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| 400 | try { |
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| 401 | p = this.parseCoords["polygon"].apply(this, [array[i]]); |
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| 402 | } catch(err) { |
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| 403 | throw err; |
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| 404 | } |
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| 405 | polys.push(p); |
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| 406 | } |
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| 407 | return new OpenLayers.Geometry.MultiPolygon(polys); |
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| 408 | }, |
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| 409 | |
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| 410 | /** |
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| 411 | * Method: parseCoords.box |
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| 412 | * Convert a coordinate array from GeoJSON into an |
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| 413 | * <OpenLayers.Geometry>. |
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| 414 | * |
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| 415 | * Parameters: |
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| 416 | * array - {Object} The coordinates array from the GeoJSON fragment. |
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| 417 | * |
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| 418 | * Returns: |
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| 419 | * {<OpenLayers.Geometry>} A geometry. |
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| 420 | */ |
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| 421 | "box": function(array) { |
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| 422 | if(array.length != 2) { |
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| 423 | throw "GeoJSON box coordinates must have 2 elements"; |
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| 424 | } |
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| 425 | return new OpenLayers.Geometry.Polygon([ |
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| 426 | new OpenLayers.Geometry.LinearRing([ |
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| 427 | new OpenLayers.Geometry.Point(array[0][0], array[0][1]), |
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| 428 | new OpenLayers.Geometry.Point(array[1][0], array[0][1]), |
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| 429 | new OpenLayers.Geometry.Point(array[1][0], array[1][1]), |
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| 430 | new OpenLayers.Geometry.Point(array[0][0], array[1][1]), |
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| 431 | new OpenLayers.Geometry.Point(array[0][0], array[0][1]) |
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| 432 | ]) |
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| 433 | ]); |
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| 434 | } |
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| 435 | |
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| 436 | }, |
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| 437 | |
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| 438 | /** |
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| 439 | * APIMethod: write |
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| 440 | * Serialize a feature, geometry, array of features into a GeoJSON string. |
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| 441 | * |
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| 442 | * Parameters: |
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| 443 | * obj - {Object} An <OpenLayers.Feature.Vector>, <OpenLayers.Geometry>, |
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| 444 | * or an array of features. |
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| 445 | * pretty - {Boolean} Structure the output with newlines and indentation. |
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| 446 | * Default is false. |
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| 447 | * |
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| 448 | * Returns: |
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| 449 | * {String} The GeoJSON string representation of the input geometry, |
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| 450 | * features, or array of features. |
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| 451 | */ |
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| 452 | write: function(obj, pretty) { |
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| 453 | var geojson = { |
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| 454 | "type": null |
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| 455 | }; |
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| 456 | if(obj instanceof Array) { |
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| 457 | geojson.type = "FeatureCollection"; |
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| 458 | var numFeatures = obj.length; |
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| 459 | geojson.features = new Array(numFeatures); |
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| 460 | for(var i=0; i<numFeatures; ++i) { |
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| 461 | var element = obj[i]; |
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| 462 | if(!element instanceof OpenLayers.Feature.Vector) { |
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| 463 | var msg = "FeatureCollection only supports collections " + |
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| 464 | "of features: " + element; |
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| 465 | throw msg; |
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| 466 | } |
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| 467 | geojson.features[i] = this.extract.feature.apply( |
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| 468 | this, [element] |
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| 469 | ); |
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| 470 | } |
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| 471 | } else if (obj.CLASS_NAME.indexOf("OpenLayers.Geometry") == 0) { |
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| 472 | geojson = this.extract.geometry.apply(this, [obj]); |
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| 473 | } else if (obj instanceof OpenLayers.Feature.Vector) { |
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| 474 | geojson = this.extract.feature.apply(this, [obj]); |
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| 475 | if(obj.layer && obj.layer.projection) { |
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| 476 | geojson.crs = this.createCRSObject(obj); |
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| 477 | } |
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| 478 | } |
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| 479 | return OpenLayers.Format.JSON.prototype.write.apply(this, |
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| 480 | [geojson, pretty]); |
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| 481 | }, |
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| 482 | |
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| 483 | /** |
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| 484 | * Method: createCRSObject |
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| 485 | * Create the CRS object for an object. |
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| 486 | * |
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| 487 | * Parameters: |
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| 488 | * object - {<OpenLayers.Feature.Vector>} |
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| 489 | * |
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| 490 | * Returns: |
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| 491 | * {Object} An object which can be assigned to the crs property |
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| 492 | * of a GeoJSON object. |
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| 493 | */ |
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| 494 | createCRSObject: function(object) { |
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| 495 | var proj = object.layer.projection.toString(); |
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| 496 | var crs = {}; |
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| 497 | if (proj.match(/epsg:/i)) { |
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| 498 | var code = parseInt(proj.substring(proj.indexOf(":") + 1)); |
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| 499 | if (code == 4326) { |
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| 500 | crs = { |
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| 501 | "type": "OGC", |
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| 502 | "properties": { |
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| 503 | "urn": "urn:ogc:def:crs:OGC:1.3:CRS84" |
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| 504 | } |
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| 505 | }; |
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| 506 | } else { |
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| 507 | crs = { |
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| 508 | "type": "EPSG", |
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| 509 | "properties": { |
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| 510 | "code": code |
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| 511 | } |
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| 512 | }; |
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| 513 | } |
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| 514 | } |
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| 515 | return crs; |
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| 516 | }, |
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| 517 | |
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| 518 | /** |
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| 519 | * Property: extract |
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| 520 | * Object with properties corresponding to the GeoJSON types. |
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| 521 | * Property values are functions that do the actual value extraction. |
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| 522 | */ |
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| 523 | extract: { |
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| 524 | /** |
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| 525 | * Method: extract.feature |
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| 526 | * Return a partial GeoJSON object representing a single feature. |
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| 527 | * |
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| 528 | * Parameters: |
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| 529 | * feature - {<OpenLayers.Feature.Vector>} |
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| 530 | * |
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| 531 | * Returns: |
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| 532 | * {Object} An object representing the point. |
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| 533 | */ |
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| 534 | 'feature': function(feature) { |
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| 535 | var geom = this.extract.geometry.apply(this, [feature.geometry]); |
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| 536 | return { |
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| 537 | "type": "Feature", |
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| 538 | "id": feature.fid == null ? feature.id : feature.fid, |
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| 539 | "properties": feature.attributes, |
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| 540 | "geometry": geom |
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| 541 | }; |
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| 542 | }, |
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| 543 | |
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| 544 | /** |
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| 545 | * Method: extract.geometry |
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| 546 | * Return a GeoJSON object representing a single geometry. |
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| 547 | * |
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| 548 | * Parameters: |
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| 549 | * geometry - {<OpenLayers.Geometry>} |
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| 550 | * |
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| 551 | * Returns: |
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| 552 | * {Object} An object representing the geometry. |
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| 553 | */ |
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| 554 | 'geometry': function(geometry) { |
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| 555 | if (geometry == null) { |
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| 556 | return null; |
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| 557 | } |
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| 558 | if (this.internalProjection && this.externalProjection) { |
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| 559 | geometry = geometry.clone(); |
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| 560 | geometry.transform(this.internalProjection, |
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| 561 | this.externalProjection); |
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| 562 | } |
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| 563 | var geometryType = geometry.CLASS_NAME.split('.')[2]; |
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| 564 | var data = this.extract[geometryType.toLowerCase()].apply(this, [geometry]); |
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| 565 | var json; |
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| 566 | if(geometryType == "Collection") { |
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| 567 | json = { |
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| 568 | "type": "GeometryCollection", |
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| 569 | "geometries": data |
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| 570 | }; |
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| 571 | } else { |
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| 572 | json = { |
---|
| 573 | "type": geometryType, |
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| 574 | "coordinates": data |
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| 575 | }; |
---|
| 576 | } |
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| 577 | |
---|
| 578 | return json; |
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| 579 | }, |
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| 580 | |
---|
| 581 | /** |
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| 582 | * Method: extract.point |
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| 583 | * Return an array of coordinates from a point. |
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| 584 | * |
---|
| 585 | * Parameters: |
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| 586 | * point - {<OpenLayers.Geometry.Point>} |
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| 587 | * |
---|
| 588 | * Returns: |
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| 589 | * {Array} An array of coordinates representing the point. |
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| 590 | */ |
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| 591 | 'point': function(point) { |
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| 592 | return [point.x, point.y]; |
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| 593 | }, |
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| 594 | |
---|
| 595 | /** |
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| 596 | * Method: extract.multipoint |
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| 597 | * Return an array of point coordinates from a multipoint. |
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| 598 | * |
---|
| 599 | * Parameters: |
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| 600 | * multipoint - {<OpenLayers.Geometry.MultiPoint>} |
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| 601 | * |
---|
| 602 | * Returns: |
---|
| 603 | * {Array} An array of point coordinate arrays representing |
---|
| 604 | * the multipoint. |
---|
| 605 | */ |
---|
| 606 | 'multipoint': function(multipoint) { |
---|
| 607 | var array = []; |
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| 608 | for(var i=0, len=multipoint.components.length; i<len; ++i) { |
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| 609 | array.push(this.extract.point.apply(this, [multipoint.components[i]])); |
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| 610 | } |
---|
| 611 | return array; |
---|
| 612 | }, |
---|
| 613 | |
---|
| 614 | /** |
---|
| 615 | * Method: extract.linestring |
---|
| 616 | * Return an array of coordinate arrays from a linestring. |
---|
| 617 | * |
---|
| 618 | * Parameters: |
---|
| 619 | * linestring - {<OpenLayers.Geometry.LineString>} |
---|
| 620 | * |
---|
| 621 | * Returns: |
---|
| 622 | * {Array} An array of coordinate arrays representing |
---|
| 623 | * the linestring. |
---|
| 624 | */ |
---|
| 625 | 'linestring': function(linestring) { |
---|
| 626 | var array = []; |
---|
| 627 | for(var i=0, len=linestring.components.length; i<len; ++i) { |
---|
| 628 | array.push(this.extract.point.apply(this, [linestring.components[i]])); |
---|
| 629 | } |
---|
| 630 | return array; |
---|
| 631 | }, |
---|
| 632 | |
---|
| 633 | /** |
---|
| 634 | * Method: extract.multilinestring |
---|
| 635 | * Return an array of linestring arrays from a linestring. |
---|
| 636 | * |
---|
| 637 | * Parameters: |
---|
| 638 | * linestring - {<OpenLayers.Geometry.MultiLineString>} |
---|
| 639 | * |
---|
| 640 | * Returns: |
---|
| 641 | * {Array} An array of linestring arrays representing |
---|
| 642 | * the multilinestring. |
---|
| 643 | */ |
---|
| 644 | 'multilinestring': function(multilinestring) { |
---|
| 645 | var array = []; |
---|
| 646 | for(var i=0, len=multilinestring.components.length; i<len; ++i) { |
---|
| 647 | array.push(this.extract.linestring.apply(this, [multilinestring.components[i]])); |
---|
| 648 | } |
---|
| 649 | return array; |
---|
| 650 | }, |
---|
| 651 | |
---|
| 652 | /** |
---|
| 653 | * Method: extract.polygon |
---|
| 654 | * Return an array of linear ring arrays from a polygon. |
---|
| 655 | * |
---|
| 656 | * Parameters: |
---|
| 657 | * polygon - {<OpenLayers.Geometry.Polygon>} |
---|
| 658 | * |
---|
| 659 | * Returns: |
---|
| 660 | * {Array} An array of linear ring arrays representing the polygon. |
---|
| 661 | */ |
---|
| 662 | 'polygon': function(polygon) { |
---|
| 663 | var array = []; |
---|
| 664 | for(var i=0, len=polygon.components.length; i<len; ++i) { |
---|
| 665 | array.push(this.extract.linestring.apply(this, [polygon.components[i]])); |
---|
| 666 | } |
---|
| 667 | return array; |
---|
| 668 | }, |
---|
| 669 | |
---|
| 670 | /** |
---|
| 671 | * Method: extract.multipolygon |
---|
| 672 | * Return an array of polygon arrays from a multipolygon. |
---|
| 673 | * |
---|
| 674 | * Parameters: |
---|
| 675 | * multipolygon - {<OpenLayers.Geometry.MultiPolygon>} |
---|
| 676 | * |
---|
| 677 | * Returns: |
---|
| 678 | * {Array} An array of polygon arrays representing |
---|
| 679 | * the multipolygon |
---|
| 680 | */ |
---|
| 681 | 'multipolygon': function(multipolygon) { |
---|
| 682 | var array = []; |
---|
| 683 | for(var i=0, len=multipolygon.components.length; i<len; ++i) { |
---|
| 684 | array.push(this.extract.polygon.apply(this, [multipolygon.components[i]])); |
---|
| 685 | } |
---|
| 686 | return array; |
---|
| 687 | }, |
---|
| 688 | |
---|
| 689 | /** |
---|
| 690 | * Method: extract.collection |
---|
| 691 | * Return an array of geometries from a geometry collection. |
---|
| 692 | * |
---|
| 693 | * Parameters: |
---|
| 694 | * collection - {<OpenLayers.Geometry.Collection>} |
---|
| 695 | * |
---|
| 696 | * Returns: |
---|
| 697 | * {Array} An array of geometry objects representing the geometry |
---|
| 698 | * collection. |
---|
| 699 | */ |
---|
| 700 | 'collection': function(collection) { |
---|
| 701 | var len = collection.components.length; |
---|
| 702 | var array = new Array(len); |
---|
| 703 | for(var i=0; i<len; ++i) { |
---|
| 704 | array[i] = this.extract.geometry.apply( |
---|
| 705 | this, [collection.components[i]] |
---|
| 706 | ); |
---|
| 707 | } |
---|
| 708 | return array; |
---|
| 709 | } |
---|
| 710 | |
---|
| 711 | |
---|
| 712 | }, |
---|
| 713 | |
---|
| 714 | CLASS_NAME: "OpenLayers.Format.GeoJSON" |
---|
| 715 | |
---|
| 716 | }); |
---|