f0d474e50b
authors.txt file. In reality, MetaCarta does not own copyright to these files, they merely have a right to distribute them under the license terms agreed to by the contributors. At this point, there is no longer any reference to MetaCarta as a copyright holder in the OpenLayers project, only to its individual contributors via the authors.txt file. git-svn-id: http://svn.openlayers.org/trunk/openlayers@10706 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
100 lines
2.7 KiB
JavaScript
100 lines
2.7 KiB
JavaScript
/* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for
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* full list of contributors). Published under the Clear BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
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* full text of the license. */
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/**
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* @requires OpenLayers/Control.js
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*/
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/**
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* Class: OpenLayers.Control.Scale
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* The Scale control displays the current map scale as a ratio (e.g. Scale =
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* 1:1M). By default it is displayed in the lower right corner of the map.
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*
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* Inherits from:
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* - <OpenLayers.Control>
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*/
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OpenLayers.Control.Scale = OpenLayers.Class(OpenLayers.Control, {
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/**
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* Parameter: element
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* {DOMElement}
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*/
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element: null,
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/**
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* APIProperty: geodesic
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* {Boolean} Use geodesic measurement. Default is false. The recommended
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* setting for maps in EPSG:4326 is false, and true EPSG:900913. If set to
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* true, the scale will be calculated based on the horizontal size of the
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* pixel in the center of the map viewport.
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*/
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geodesic: false,
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/**
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* Constructor: OpenLayers.Control.Scale
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*
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* Parameters:
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* element - {DOMElement}
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* options - {Object}
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*/
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initialize: function(element, options) {
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OpenLayers.Control.prototype.initialize.apply(this, [options]);
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this.element = OpenLayers.Util.getElement(element);
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},
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/**
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* Method: draw
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*
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* Returns:
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* {DOMElement}
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*/
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draw: function() {
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OpenLayers.Control.prototype.draw.apply(this, arguments);
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if (!this.element) {
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this.element = document.createElement("div");
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this.div.appendChild(this.element);
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}
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this.map.events.register( 'moveend', this, this.updateScale);
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this.updateScale();
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return this.div;
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},
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/**
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* Method: updateScale
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*/
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updateScale: function() {
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var scale;
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if(this.geodesic === true) {
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var units = this.map.getUnits();
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if(!units) {
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return;
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}
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var inches = OpenLayers.INCHES_PER_UNIT;
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scale = (this.map.getGeodesicPixelSize().w || 0.000001) *
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inches["km"] * OpenLayers.DOTS_PER_INCH;
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} else {
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scale = this.map.getScale();
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}
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if (!scale) {
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return;
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}
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if (scale >= 9500 && scale <= 950000) {
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scale = Math.round(scale / 1000) + "K";
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} else if (scale >= 950000) {
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scale = Math.round(scale / 1000000) + "M";
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} else {
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scale = Math.round(scale);
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}
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this.element.innerHTML = OpenLayers.i18n("scale", {'scaleDenom':scale});
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},
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CLASS_NAME: "OpenLayers.Control.Scale"
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});
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