--- a/labs/openlayers/lib/OpenLayers/Control/ScaleLine.js
+++ b/labs/openlayers/lib/OpenLayers/Control/ScaleLine.js
@@ -1,1 +1,224 @@
-
+/* 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.ScaleLine
+ * The ScaleLine displays a small line indicator representing the current 
+ * map scale on the map. By default it is drawn in the lower left corner of
+ * the map.
+ * 
+ * Inherits from:
+ *  - <OpenLayers.Control>
+ *  
+ * Is a very close copy of:
+ *  - <OpenLayers.Control.Scale>
+ */
+OpenLayers.Control.ScaleLine = OpenLayers.Class(OpenLayers.Control, {
+
+    /**
+     * Property: maxWidth
+     * {Integer} Maximum width of the scale line in pixels.  Default is 100.
+     */
+    maxWidth: 100,
+
+    /**
+     * Property: topOutUnits
+     * {String} Units for zoomed out on top bar.  Default is km.
+     */
+    topOutUnits: "km",
+    
+    /**
+     * Property: topInUnits
+     * {String} Units for zoomed in on top bar.  Default is m.
+     */
+    topInUnits: "m",
+
+    /**
+     * Property: bottomOutUnits
+     * {String} Units for zoomed out on bottom bar.  Default is mi.
+     */
+    bottomOutUnits: "mi",
+
+    /**
+     * Property: bottomInUnits
+     * {String} Units for zoomed in on bottom bar.  Default is ft.
+     */
+    bottomInUnits: "ft",
+    
+    /**
+     * Property: eTop
+     * {DOMElement}
+     */
+    eTop: null,
+
+    /**
+     * Property: eBottom
+     * {DOMElement}
+     */
+    eBottom: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.ScaleLine
+     * Create a new scale line control.
+     * 
+     * Parameters:
+     * options - {Object} An optional object whose properties will be used
+     *     to extend the control.
+     */
+    initialize: function(options) {
+        OpenLayers.Control.prototype.initialize.apply(this, [options]);     
+    },
+
+    /**
+     * Method: draw
+     * 
+     * Returns:
+     * {DOMElement}
+     */
+    draw: function() {
+        OpenLayers.Control.prototype.draw.apply(this, arguments);
+        if (!this.eTop) {
+            // stick in the top bar
+            this.eTop = document.createElement("div");
+            this.eTop.className = this.displayClass + "Top";
+            var theLen = this.topInUnits.length;
+            this.div.appendChild(this.eTop);
+            if((this.topOutUnits == "") || (this.topInUnits == "")) {
+                this.eTop.style.visibility = "hidden";
+            } else {
+                this.eTop.style.visibility = "visible";
+            }
+
+            // and the bottom bar
+            this.eBottom = document.createElement("div");
+            this.eBottom.className = this.displayClass + "Bottom";
+            this.div.appendChild(this.eBottom);
+            if((this.bottomOutUnits == "") || (this.bottomInUnits == "")) {
+                this.eBottom.style.visibility = "hidden";
+            } else {
+                this.eBottom.style.visibility = "visible";
+            }
+        }
+        this.map.events.register('moveend', this, this.update);
+        this.update();
+        return this.div;
+    },
+
+    /** 
+     * Method: getBarLen
+     * Given a number, round it down to the nearest 1,2,5 times a power of 10.
+     * That seems a fairly useful set of number groups to use.
+     * 
+     * Parameters:
+     * maxLen - {float}  the number we're rounding down from
+     * 
+     * Returns:
+     * {Float} the rounded number (less than or equal to maxLen)
+     */
+    getBarLen: function(maxLen) {
+        // nearest power of 10 lower than maxLen
+        var digits = parseInt(Math.log(maxLen) / Math.log(10));
+        var pow10 = Math.pow(10, digits);
+        
+        // ok, find first character
+        var firstChar = parseInt(maxLen / pow10);
+
+        // right, put it into the correct bracket
+        var barLen;
+        if(firstChar > 5) {
+            barLen = 5;
+        } else if(firstChar > 2) {
+            barLen = 2;
+        } else {
+            barLen = 1;
+        }
+
+        // scale it up the correct power of 10
+        return barLen * pow10;
+    },
+
+    /**
+     * Method: update
+     * Update the size of the bars, and the labels they contain.
+     */
+    update: function() {
+        var res = this.map.getResolution();
+        if (!res) {
+            return;
+        }
+
+        var curMapUnits = this.map.getUnits();
+        var inches = OpenLayers.INCHES_PER_UNIT;
+
+        // convert maxWidth to map units
+        var maxSizeData = this.maxWidth * res * inches[curMapUnits];
+        var geodesicRatio = 1;
+        if(this.geodesic === true) {
+            var maxSizeGeodesic = (this.map.getGeodesicPixelSize().w ||
+                0.000001) * this.maxWidth;
+            var maxSizeKilometers = maxSizeData / inches["km"];
+            geodesicRatio = maxSizeGeodesic / maxSizeKilometers;
+            maxSizeData *= geodesicRatio;
+        }
+
+        // decide whether to use large or small scale units     
+        var topUnits;
+        var bottomUnits;
+        if(maxSizeData > 100000) {
+            topUnits = this.topOutUnits;
+            bottomUnits = this.bottomOutUnits;
+        } else {
+            topUnits = this.topInUnits;
+            bottomUnits = this.bottomInUnits;
+        }
+
+        // and to map units units
+        var topMax = maxSizeData / inches[topUnits];
+        var bottomMax = maxSizeData / inches[bottomUnits];
+
+        // now trim this down to useful block length
+        var topRounded = this.getBarLen(topMax);
+        var bottomRounded = this.getBarLen(bottomMax);
+
+        // and back to display units
+        topMax = topRounded / inches[curMapUnits] * inches[topUnits];
+        bottomMax = bottomRounded / inches[curMapUnits] * inches[bottomUnits];
+
+        // and to pixel units
+        var topPx = topMax / res / geodesicRatio;
+        var bottomPx = bottomMax / res / geodesicRatio;
+        
+        // now set the pixel widths
+        // and the values inside them
+        
+        if (this.eBottom.style.visibility == "visible"){
+            this.eBottom.style.width = Math.round(bottomPx) + "px"; 
+            this.eBottom.innerHTML = bottomRounded + " " + bottomUnits ;
+        }
+            
+        if (this.eTop.style.visibility == "visible"){
+            this.eTop.style.width = Math.round(topPx) + "px";
+            this.eTop.innerHTML = topRounded + " " + topUnits;
+        }
+        
+    }, 
+
+    CLASS_NAME: "OpenLayers.Control.ScaleLine"
+});
+
+