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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
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* full list of contributors). Published under the 2-clause BSD license.
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* See license.txt in the OpenLayers distribution or repository 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.ScaleLine
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* The ScaleLine displays a small line indicator representing the current
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* map scale on the map. By default it is drawn in the lower left corner of
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* 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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* Is a very close copy of:
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* - <OpenLayers.Control.Scale>
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*/
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OpenLayers.Control.ScaleLine = OpenLayers.Class(OpenLayers.Control, {
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/**
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* Property: maxWidth
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* {Integer} Maximum width of the scale line in pixels. Default is 100.
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*/
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maxWidth: 100,
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/**
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* Property: topOutUnits
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* {String} Units for zoomed out on top bar. Default is km.
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*/
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topOutUnits: "km",
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/**
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* Property: topInUnits
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* {String} Units for zoomed in on top bar. Default is m.
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*/
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topInUnits: "m",
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/**
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* Property: bottomOutUnits
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* {String} Units for zoomed out on bottom bar. Default is mi.
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*/
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bottomOutUnits: "mi",
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/**
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* Property: bottomInUnits
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* {String} Units for zoomed in on bottom bar. Default is ft.
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*/
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bottomInUnits: "ft",
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/**
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* Property: eTop
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* {DOMElement}
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*/
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eTop: null,
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/**
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* Property: eBottom
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* {DOMElement}
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*/
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eBottom: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.ScaleLine
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* Create a new scale line control.
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*
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* Parameters:
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* options - {Object} An optional object whose properties will be used
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* to extend the control.
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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.eTop) {
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// stick in the top bar
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this.eTop = document.createElement("div");
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this.eTop.className = this.displayClass + "Top";
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var theLen = this.topInUnits.length;
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this.div.appendChild(this.eTop);
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if((this.topOutUnits == "") || (this.topInUnits == "")) {
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this.eTop.style.visibility = "hidden";
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} else {
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this.eTop.style.visibility = "visible";
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}
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// and the bottom bar
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this.eBottom = document.createElement("div");
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this.eBottom.className = this.displayClass + "Bottom";
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this.div.appendChild(this.eBottom);
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if((this.bottomOutUnits == "") || (this.bottomInUnits == "")) {
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this.eBottom.style.visibility = "hidden";
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} else {
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this.eBottom.style.visibility = "visible";
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}
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}
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this.map.events.register('moveend', this, this.update);
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this.update();
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return this.div;
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},
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/**
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* Method: getBarLen
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* Given a number, round it down to the nearest 1,2,5 times a power of 10.
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* That seems a fairly useful set of number groups to use.
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*
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* Parameters:
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* maxLen - {float} the number we're rounding down from
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*
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* Returns:
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* {Float} the rounded number (less than or equal to maxLen)
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*/
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getBarLen: function(maxLen) {
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// nearest power of 10 lower than maxLen
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var digits = parseInt(Math.log(maxLen) / Math.log(10));
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var pow10 = Math.pow(10, digits);
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// ok, find first character
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var firstChar = parseInt(maxLen / pow10);
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// right, put it into the correct bracket
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var barLen;
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if(firstChar > 5) {
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barLen = 5;
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} else if(firstChar > 2) {
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barLen = 2;
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} else {
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barLen = 1;
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}
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// scale it up the correct power of 10
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return barLen * pow10;
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},
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/**
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* Method: update
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* Update the size of the bars, and the labels they contain.
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*/
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update: function() {
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var res = this.map.getResolution();
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if (!res) {
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return;
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}
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var curMapUnits = this.map.getUnits();
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var inches = OpenLayers.INCHES_PER_UNIT;
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// convert maxWidth to map units
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var maxSizeData = this.maxWidth * res * inches[curMapUnits];
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var geodesicRatio = 1;
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if(this.geodesic === true) {
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var maxSizeGeodesic = (this.map.getGeodesicPixelSize().w ||
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0.000001) * this.maxWidth;
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var maxSizeKilometers = maxSizeData / inches["km"];
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geodesicRatio = maxSizeGeodesic / maxSizeKilometers;
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maxSizeData *= geodesicRatio;
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}
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// decide whether to use large or small scale units
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var topUnits;
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var bottomUnits;
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if(maxSizeData > 100000) {
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topUnits = this.topOutUnits;
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bottomUnits = this.bottomOutUnits;
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} else {
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topUnits = this.topInUnits;
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bottomUnits = this.bottomInUnits;
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}
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// and to map units units
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var topMax = maxSizeData / inches[topUnits];
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var bottomMax = maxSizeData / inches[bottomUnits];
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// now trim this down to useful block length
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var topRounded = this.getBarLen(topMax);
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var bottomRounded = this.getBarLen(bottomMax);
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// and back to display units
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topMax = topRounded / inches[curMapUnits] * inches[topUnits];
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bottomMax = bottomRounded / inches[curMapUnits] * inches[bottomUnits];
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// and to pixel units
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var topPx = topMax / res / geodesicRatio;
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var bottomPx = bottomMax / res / geodesicRatio;
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// now set the pixel widths
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// and the values inside them
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if (this.eBottom.style.visibility == "visible"){
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this.eBottom.style.width = Math.round(bottomPx) + "px";
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this.eBottom.innerHTML = bottomRounded + " " + bottomUnits ;
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}
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if (this.eTop.style.visibility == "visible"){
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this.eTop.style.width = Math.round(topPx) + "px";
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this.eTop.innerHTML = topRounded + " " + topUnits;
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}
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},
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CLASS_NAME: "OpenLayers.Control.ScaleLine"
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});
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