You find below the HTML code of the visualisation.
You can copy and paste the code into an existing HTML page.
For more information see also ?print.gvis

<!-- Calendar generated in R 3.0.3 by googleVis 0.5.0-4 package --> <!-- Wed Apr 2 19:00:45 2014 --> <!-- jsHeader --> <script type="text/javascript"> // jsData function gvisDataCalendar () { var data = new google.visualization.DataTable(); var datajson = [ [ new Date(2014,3,1), 41.42 ], [ new Date(2014,2,31), 40.99 ], [ new Date(2014,2,28), 40.3 ], [ new Date(2014,2,27), 39.36 ], [ new Date(2014,2,26), 39.79 ], [ new Date(2014,2,25), 40.34 ], [ new Date(2014,2,24), 40.5 ], [ new Date(2014,2,21), 40.16 ], [ new Date(2014,2,20), 40.33 ], [ new Date(2014,2,19), 39.27 ], [ new Date(2014,2,18), 39.55 ], [ new Date(2014,2,17), 38.05 ], [ new Date(2014,2,14), 37.7 ], [ new Date(2014,2,13), 37.89 ], [ new Date(2014,2,12), 38.27 ], [ new Date(2014,2,11), 38.02 ], [ new Date(2014,2,10), 37.82 ], [ new Date(2014,2,7), 37.9 ], [ new Date(2014,2,6), 38.15 ], [ new Date(2014,2,5), 38.11 ], [ new Date(2014,2,4), 38.41 ], [ new Date(2014,2,3), 37.78 ], [ new Date(2014,1,28), 38.31 ], [ new 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Date(2012,3,13), 29.06 ], [ new Date(2012,3,12), 29.22 ], [ new Date(2012,3,11), 28.62 ], [ new Date(2012,3,10), 28.74 ], [ new Date(2012,3,9), 29.33 ], [ new Date(2012,3,5), 29.73 ], [ new Date(2012,3,4), 29.43 ], [ new Date(2012,3,3), 30.12 ], [ new Date(2012,3,2), 30.45 ], [ new Date(2012,2,30), 30.42 ], [ new Date(2012,2,29), 30.29 ], [ new Date(2012,2,28), 30.36 ], [ new Date(2012,2,27), 30.67 ], [ new Date(2012,2,26), 30.73 ], [ new Date(2012,2,23), 30.19 ], [ new Date(2012,2,22), 30.18 ], [ new Date(2012,2,21), 30.09 ], [ new Date(2012,2,20), 30.17 ], [ new Date(2012,2,19), 30.37 ], [ new Date(2012,2,16), 30.74 ], [ new Date(2012,2,15), 30.98 ], [ new Date(2012,2,14), 30.9 ], [ new Date(2012,2,13), 30.81 ], [ new Date(2012,2,12), 30.22 ], [ new Date(2012,2,9), 30.17 ], [ new Date(2012,2,8), 30.19 ], [ new Date(2012,2,7), 30.03 ], [ new Date(2012,2,6), 29.76 ], [ new Date(2012,2,5), 29.99 ], [ new Date(2012,2,2), 30.25 ], [ new Date(2012,2,1), 30.45 ], [ new Date(2012,1,29), 29.93 ], [ new Date(2012,1,28), 30.06 ], [ new Date(2012,1,27), 29.57 ], [ new Date(2012,1,24), 29.69 ], [ new Date(2012,1,23), 29.58 ], [ new Date(2012,1,22), 29.49 ], [ new Date(2012,1,21), 29.65 ], [ new Date(2012,1,17), 29.47 ], [ new Date(2012,1,16), 29.51 ], [ new Date(2012,1,15), 28.34 ], [ new Date(2012,1,14), 28.53 ], [ new Date(2012,1,13), 28.65 ], [ new Date(2012,1,10), 28.58 ], [ new Date(2012,1,9), 28.83 ], [ new Date(2012,1,8), 28.73 ], [ new Date(2012,1,7), 28.44 ], [ new Date(2012,1,6), 28.29 ], [ new Date(2012,1,3), 28.33 ], [ new Date(2012,1,2), 28.06 ], [ new Date(2012,1,1), 28 ] ]; data.addColumn('date','Date'); data.addColumn('number','Adj.Close'); data.addRows(datajson); return(data); } // jsDrawChart function drawChartCalendar() { var data = gvisDataCalendar(); var options = {}; options["width"] = 590; options["height"] = 320; options["title"] = "Calendar heat map of MSFT adjsuted close"; options["calendar"] = {cellSize:10, yearLabel:{fontSize:20, color:'#444444'}, focusedCellColor:{stroke:'red'}}; var chart = new google.visualization.Calendar( document.getElementById('Calendar') ); chart.draw(data,options); } // jsDisplayChart (function() { var pkgs = window.__gvisPackages = window.__gvisPackages || []; var callbacks = window.__gvisCallbacks = window.__gvisCallbacks || []; var chartid = "calendar"; // Manually see if chartid is in pkgs (not all browsers support Array.indexOf) var i, newPackage = true; for (i = 0; newPackage && i < pkgs.length; i++) { if (pkgs[i] === chartid) newPackage = false; } if (newPackage) pkgs.push(chartid); // Add the drawChart function to the global list of callbacks callbacks.push(drawChartCalendar); })(); function displayChartCalendar() { var pkgs = window.__gvisPackages = window.__gvisPackages || []; var callbacks = window.__gvisCallbacks = window.__gvisCallbacks || []; window.clearTimeout(window.__gvisLoad); // The timeout is set to 100 because otherwise the container div we are // targeting might not be part of the document yet window.__gvisLoad = setTimeout(function() { var pkgCount = pkgs.length; google.load("visualization", "1", { packages:pkgs, callback: function() { if (pkgCount != pkgs.length) { // Race condition where another setTimeout call snuck in after us; if // that call added a package, we must not shift its callback return; } while (callbacks.length > 0) callbacks.shift()(); } }); }, 100); } // jsFooter </script> <!-- jsChart --> <script type="text/javascript" src="https://www.google.com/jsapi?callback=displayChartCalendar"></script> <!-- divChart --> <div id="Calendar" style="width: 590px; height: 320px;"> </div>