1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | /* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD * license. See http://svn.openlayers.org/trunk/openlayers/license.txt for the * full text of the license. */ /** * @requires OpenLayers/Console.js */ /** * Class: OpenLayers.LonLat * This class represents a longitude and latitude pair */ OpenLayers.LonLat = OpenLayers.Class({ /** * APIProperty: lon * {Float} The x-axis coodinate in map units */ lon: 0.0, /** * APIProperty: lat * {Float} The y-axis coordinate in map units */ lat: 0.0, /** * Constructor: OpenLayers.LonLat * Create a new map location. * * Parameters: * lon - {Number} The x-axis coordinate in map units. If your map is in * a geographic projection, this will be the Longitude. Otherwise, * it will be the x coordinate of the map location in your map units. * lat - {Number} The y-axis coordinate in map units. If your map is in * a geographic projection, this will be the Latitude. Otherwise, * it will be the y coordinate of the map location in your map units. */ initialize: function(lon, lat) { this.lon = OpenLayers.Util.toFloat(lon); this.lat = OpenLayers.Util.toFloat(lat); }, /** * Method: toString * Return a readable string version of the lonlat * * Returns: * {String} String representation of OpenLayers.LonLat object. * (ex. <i>"lon=5,lat=42"</i>) */ toString:function() { return ("lon=" + this.lon + ",lat=" + this.lat); }, /** * APIMethod: toShortString * * Returns: * {String} Shortened String representation of OpenLayers.LonLat object. * (ex. <i>"5, 42"</i>) */ toShortString:function() { return (this.lon + ", " + this.lat); }, /** * APIMethod: clone * * Returns: * {<OpenLayers.LonLat>} New OpenLayers.LonLat object with the same lon * and lat values */ clone:function() { return new OpenLayers.LonLat(this.lon, this.lat); }, /** * APIMethod: add * * Parameters: * lon - {Float} * lat - {Float} * * Returns: * {<OpenLayers.LonLat>} A new OpenLayers.LonLat object with the lon and * lat passed-in added to this's. */ add:function(lon, lat) { if ( (lon == null) || (lat == null) ) { var msg = OpenLayers.i18n("lonlatAddError"); OpenLayers.Console.error(msg); return null; } return new OpenLayers.LonLat(this.lon + lon, this.lat + lat); }, /** * APIMethod: equals * * Parameters: * ll - {<OpenLayers.LonLat>} * * Returns: * {Boolean} Boolean value indicating whether the passed-in * <OpenLayers.LonLat> object has the same lon and lat * components as this. * Note: if ll passed in is null, returns false */ equals:function(ll) { var equals = false; if (ll != null) { equals = ((this.lon == ll.lon && this.lat == ll.lat) || (isNaN(this.lon) && isNaN(this.lat) && isNaN(ll.lon) && isNaN(ll.lat))); } return equals; }, /** * APIMethod: transform * Transform the LonLat object from source to dest. This transformation is * *in place*: if you want a *new* lonlat, use .clone() first. * * Parameters: * source - {<OpenLayers.Projection>} Source projection. * dest - {<OpenLayers.Projection>} Destination projection. * * Returns: * {<OpenLayers.LonLat>} Itself, for use in chaining operations. */ transform: function(source, dest) { var point = OpenLayers.Projection.transform( {'x': this.lon, 'y': this.lat}, source, dest); this.lon = point.x; this.lat = point.y; return this; }, /** * APIMethod: wrapDateLine * * Parameters: * maxExtent - {<OpenLayers.Bounds>} * * Returns: * {<OpenLayers.LonLat>} A copy of this lonlat, but wrapped around the * "dateline" (as specified by the borders of * maxExtent) */ wrapDateLine: function(maxExtent) { var newLonLat = this.clone(); if (maxExtent) { //shift right? while (newLonLat.lon < maxExtent.left) { newLonLat.lon += maxExtent.getWidth(); } //shift left? while (newLonLat.lon > maxExtent.right) { newLonLat.lon -= maxExtent.getWidth(); } } return newLonLat; }, CLASS_NAME: "OpenLayers.LonLat" }); /** * Function: fromString * Alternative constructor that builds a new <OpenLayers.LonLat> from a * parameter string * * Parameters: * str - {String} Comma-separated Lon,Lat coordinate string. * (ex. <i>"5,40"</i>) * * Returns: * {<OpenLayers.LonLat>} New <OpenLayers.LonLat> object built from the * passed-in String. */ OpenLayers.LonLat.fromString = function(str) { var pair = str.split(","); return new OpenLayers.LonLat(parseFloat(pair[0]), parseFloat(pair[1])); }; |