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    <p>I found a Library keydragzoom (<a href="http://google-maps-utility-library-v3.googlecode.com/svn/tags/keydragzoom/1.0/docs/reference.html" rel="nofollow">http://google-maps-utility-library-v3.googlecode.com/svn/tags/keydragzoom/1.0/docs/reference.html</a>) and used it to draw a rectangle on the page. </p> <p>Later, I edit the library and stopped it from zooming the selected area and instead made it return the correct co-ordinates in 'dragend' event. Then I manually looped through all the marker on the map to find the markers that are within that particular region. The library was not giving me the proper co-ordinates to I made the following changes. </p> <p>Changed the DragZoom function to</p> <pre><code> var prj = null; function DragZoom(map, opt_zoomOpts) { var ov = new google.maps.OverlayView(); var me = this; ov.onAdd = function () { me.init_(map, opt_zoomOpts); }; ov.draw = function () { }; ov.onRemove = function () { }; ov.setMap(map); this.prjov_ = ov; google.maps.event.addListener(map, 'idle', function () { prj = ov.getProjection(); }); } </code></pre> <p>and DragZoom.prototype.onMouseUp_ function to</p> <pre><code>DragZoom.prototype.onMouseUp_ = function (e) { this.mouseDown_ = false; if (this.dragging_) { var left = Math.min(this.startPt_.x, this.endPt_.x); var top = Math.min(this.startPt_.y, this.endPt_.y); var width = Math.abs(this.startPt_.x - this.endPt_.x); var height = Math.abs(this.startPt_.y - this.endPt_.y); var points={ top: top, left: left, bottom: top + height, right: left + width }; var prj = this.prjov_.getProjection(); // 2009-05-29: since V3 does not have fromContainerPixel, //needs find offset here var containerPos = getElementPosition(this.map_.getDiv()); var mapPanePos = getElementPosition(this.prjov_.getPanes().mapPane); left = left + (containerPos.left - mapPanePos.left); top = top + (containerPos.top - mapPanePos.top); var sw = prj.fromDivPixelToLatLng(new google.maps.Point(left, top + height)); var ne = prj.fromDivPixelToLatLng(new google.maps.Point(left + width, top)); var bnds = new google.maps.LatLngBounds(sw, ne); //this.map_.fitBounds(bnds); this.dragging_ = false; this.boxDiv_.style.display = 'none'; /** * This event is fired when the drag operation ends. * Note that the event is not fired if the hot key is released before the drag operation ends. * @name DragZoom#dragend * @param {GLatLngBounds} newBounds * @event */ google.maps.event.trigger(this, 'dragend', points); } }; </code></pre>
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