| /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for | |
| * full list of contributors). Published under the Clear BSD license. | |
| * See http://svn.openlayers.org/trunk/openlayers/license.txt for the | |
| * full text of the license. */ | |
| /** | |
| * @requires OpenLayers/Control.js | |
| */ | |
| /** | |
| * Class: OpenLayers.Control.Scale | |
| * The Scale control displays the current map scale as a ratio (e.g. Scale = | |
| * 1:1M). By default it is displayed in the lower right corner of the map. | |
| * | |
| * Inherits from: | |
| * - <OpenLayers.Control> | |
| */ | |
| OpenLayers.Control.Scale = OpenLayers.Class(OpenLayers.Control, { | |
| /** | |
| * Parameter: element | |
| * {DOMElement} | |
| */ | |
| element: null, | |
| /** | |
| * APIProperty: geodesic | |
| * {Boolean} Use geodesic measurement. Default is false. The recommended | |
| * setting for maps in EPSG:4326 is false, and true EPSG:900913. If set to | |
| * true, the scale will be calculated based on the horizontal size of the | |
| * pixel in the center of the map viewport. | |
| */ | |
| geodesic: false, | |
| /** | |
| * Constructor: OpenLayers.Control.Scale | |
| * | |
| * Parameters: | |
| * element - {DOMElement} | |
| * options - {Object} | |
| */ | |
| initialize: function(element, options) { | |
| OpenLayers.Control.prototype.initialize.apply(this, [options]); | |
| this.element = OpenLayers.Util.getElement(element); | |
| }, | |
| /** | |
| * Method: draw | |
| * | |
| * Returns: | |
| * {DOMElement} | |
| */ | |
| draw: function() { | |
| OpenLayers.Control.prototype.draw.apply(this, arguments); | |
| if (!this.element) { | |
| this.element = document.createElement("div"); | |
| this.div.appendChild(this.element); | |
| } | |
| this.map.events.register( 'moveend', this, this.updateScale); | |
| this.updateScale(); | |
| return this.div; | |
| }, | |
| /** | |
| * Method: updateScale | |
| */ | |
| updateScale: function() { | |
| var scale; | |
| if(this.geodesic === true) { | |
| var units = this.map.getUnits(); | |
| if(!units) { | |
| return; | |
| } | |
| var inches = OpenLayers.INCHES_PER_UNIT; | |
| scale = (this.map.getGeodesicPixelSize().w || 0.000001) * | |
| inches["km"] * OpenLayers.DOTS_PER_INCH; | |
| } else { | |
| scale = this.map.getScale(); | |
| } | |
| if (!scale) { | |
| return; | |
| } | |
| if (scale >= 9500 && scale <= 950000) { | |
| scale = Math.round(scale / 1000) + "K"; | |
| } else if (scale >= 950000) { | |
| scale = Math.round(scale / 1000000) + "M"; | |
| } else { | |
| scale = Math.round(scale); | |
| } | |
| this.element.innerHTML = OpenLayers.i18n("scale", {'scaleDenom':scale}); | |
| }, | |
| CLASS_NAME: "OpenLayers.Control.Scale" | |
| }); | |