diff --git a/c3.js b/c3.js
index 6a35827..e0fcc27 100644
--- a/c3.js
+++ b/c3.js
@@ -4674,6 +4674,27 @@
             redraw({withUpdateXDomain: true});
         };
 
+        // For passing the configuration you want to update.
+        c3.update = function (keys, value) {
+            var target = config, i, isLast, nextTarget;
+
+            for (i = 0; i < keys.length; i++) {
+                isLast = (i === keys.length - 1);
+                nextTarget = target[keys[i]];
+                if (isLast) {
+                    if (target[keys[i]] === undefined) {
+                      target[keys[i]] = '';
+                    }
+                    target[keys[i]] = value;
+                } else {
+                    target = nextTarget;
+                }
+            }
+
+            // Don't have a way to set the __variables without regenerating.
+            return parent.c3.generate(config);
+        };
+
         c3.load = function (args) {
             // update xs if specified
             if (args.xs) {
diff --git a/c3.min.js b/c3.min.js
index 1b64625..dbb0feb 100644
--- a/c3.min.js
+++ b/c3.min.js
@@ -1 +1 @@
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di=30,vi=gt&&!yt?0:30,mi=5;_r=u.layout.pie().value(function(e){return e.values.reduce(function(e,t){return e+t.value},0)});var Pf,Hf=function(){};Pf=u.svg.brush().on("brush",nl);Pf.update=function(){if(If){If.select("."+n.brush).call(this)}return this};Pf.scale=function(e){return gt?this.y(e):this.x(e)};if(b){Hf=u.behavior.zoom().on("zoomstart",function(){Hf.altDomain=u.event.sourceEvent.altKey?Rr.orgDomain():null}).on("zoom",b?rl:null);Hf.scale=function(e){return gt?this.y(e):this.x(e)};Hf.orgScaleExtent=function(){var e=w?w:[1,10];return[e[0],Math.max(Do()/e[1],e[1])]};Hf.updateScaleExtent=function(){var e=uo(Rr.orgDomain())/uo(zf),t=this.orgScaleExtent();this.scaleExtent([t[0]*e,t[1]*e]);return this}}var Bf,jf,Ff,If,qf,Rf,Uf;var zf;var Wf,Xf={};a.focus=function(e){function s(e){Ro(e).transition().duration(100).style("opacity",1)}var t=Bf.selectAll(Tu(e)),r=t.filter(bl),i=t.filter(wl);a.revert();a.defocus();s(r.classed(n.focused,true));s(i);if(Ca(a.data.targets)){Vs(e,true)}dl(e,true)};a.defocus=function(e){function s(e){Ro(e).transition().duration(100).style("opacity",.3)}var t=Bf.selectAll(Tu(e)),r=t.filter(bl),i=t.filter(wl);a.revert();s(r.classed(n.focused,false));s(i);if(Ca(a.data.targets)){$s(e)}dl(e,false)};a.revert=function(e){function s(e){Ro(e).transition().duration(100).style("opacity",1)}var 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e&&ao(e.cacheIds)){fl(lo(e.cacheIds),e.done);return}if("unload"in e){cl(jo(typeof e.unload==="boolean"&&e.unload?null:e.unload),function(){ll(e)})}else{ll(e)}};a.unload=function(e,t){cl(jo(e),function(){tl({withUpdateOrgXDomain:true,withUpdateXDomain:true,withLegend:true});if(typeof t==="function"){t()}})};a.selected=function(e){return u.merge(Ff.selectAll("."+n.shapes+xu(e)).selectAll("."+n.shape).filter(function(){return u.select(this).classed(n.SELECTED)}).map(function(e){return e.map(function(e){var t=e.__data__;return t.data?t.data:t})}))};a.select=function(e,t,r){if(!X){return}Ff.selectAll("."+n.shapes).selectAll("."+n.shape).each(function(i,o){var a=u.select(this),f=i.data?i.data.id:i.id,l=pf(this),c=V||!e||e.indexOf(f)>=0,h=!t||t.indexOf(o)>=0,p=a.classed(n.SELECTED);if(a.classed(n.line)||a.classed(n.area)){return}if(c&&h){if($(i)&&!p){l(true,a.classed(n.SELECTED,true),i,o)}}else if(s(r)&&r){if(p){l(false,a.classed(n.SELECTED,false),i,o)}}})};a.unselect=function(e,t){if(!X){return}Ff.selectAll("."+n.shapes).selectAll("."+n.shape).each(function(r,i){var s=u.select(this),o=r.data?r.data.id:r.id,a=pf(this),f=V||!e||e.indexOf(o)>=0,l=!t||t.indexOf(i)>=0,c=s.classed(n.SELECTED);if(s.classed(n.line)||s.classed(n.area)){return}if(f&&l){if($(r)){if(c){a(false,s.classed(n.SELECTED,false),r,i)}}}})};a.toLine=function(e){Sl(e,"line")};a.toSpline=function(e){Sl(e,"spline")};a.toBar=function(e){Sl(e,"bar")};a.toScatter=function(e){Sl(e,"scatter")};a.toArea=function(e){Sl(e,"area")};a.toAreaSpline=function(e){Sl(e,"area-spline")};a.toPie=function(e){Sl(e,"pie",{withTransform:true})};a.toDonut=function(e){Sl(e,"donut",{withTransform:true})};a.groups=function(e){if(i(e)){return P}P=e;tl();return P};a.xgrids=function(e){if(!e){return nn}nn=e;tl();return nn};a.xgrids.add=function(e){if(!e){return}return a.xgrids(nn.concat(e))};a.xgrids.remove=function(e){var t=El(e);return a.xgrids(nn.filter(t))};a.ygrids=function(e){if(!e){return sn}sn=e;tl();return sn};a.ygrids.add=function(e){if(!e){return}return a.ygrids(sn.concat(e))};a.ygrids.remove=function(e){var t=El(e);return a.ygrids(sn.filter(t))};a.regions=function(e){if(!e){return qn}qn=e;tl();return qn};a.regions.add=function(e){if(!e){return qn}qn=qn.concat(e);tl();return qn};a.regions.remove=function(e){var t,r,i;e=e||{};t=nf(e,"duration",k);r=nf(e,"classes",[n.region]);i=Ff.select("."+n.regions).selectAll(r.map(function(e){return"."+e}));(t?i.transition().duration(t):i).style("opacity",0).remove();qn=qn.filter(function(e){var t=false;if(!e.class){return true}e.class.split(" ").forEach(function(e){if(r.indexOf(e)>=0){t=true}});return!t});return qn};a.data.get=function(e){var t=a.data.getAsTarget(e);return s(t)?t.values.map(function(e){return e.value}):undefined};a.data.getAsTarget=function(e){var t=a.data.targets.filter(function(t){return t.id===e});return t.length>0?t[0]:undefined};a.data.names=function(e){if(!arguments.length){return _}Object.keys(e).forEach(function(t){_[t]=e[t]});tl({withLegend:true});return _};a.data.colors=function(e){if(!arguments.length){return U}Object.keys(e).forEach(function(t){U[t]=e[t]});tl({withLegend:true});return U};a.x=function(e){if(arguments.length){To(a.data.targets,e);tl({withUpdateOrgXDomain:true,withUpdateXDomain:true})}return a.data.xs};a.xs=function(e){if(arguments.length){No(a.data.targets,e);tl({withUpdateOrgXDomain:true,withUpdateXDomain:true})}return a.data.xs};a.axis.labels=function(e){if(arguments.length){Object.keys(e).forEach(function(t){fs(t,e[t])});js()}};a.axis.max=function(e){if(arguments.length){if(typeof e==="object"){if(r(e.x)){Ot=+e.x}if(r(e.y)){jt=+e.y}if(r(e.y2)){Vt=+e.y2}}else{jt=Vt=+e}tl({withUpdateOrgXDomain:true,withUpdateXDomain:true})}};a.axis.min=function(e){if(arguments.length){if(typeof e==="object"){if(r(e.x)){Mt=+e.x}if(r(e.y)){Ft=+e.y}if(r(e.y2)){$t=+e.y2}}else{Ft=$t=+e}tl({withUpdateOrgXDomain:true,withUpdateXDomain:true})}};a.axis.range=function(e){if(arguments.length){if(typeof e.max!=="undefined"){a.axis.max(e.max)}if(typeof e.min!=="undefined"){a.axis.min(e.min)}}};a.legend.show=function(e){ml(jo(e));tl({withLegend:true})};a.legend.hide=function(e){gl(jo(e));tl({withLegend:true})};a.resize=function(e){p=e?e.width:null;d=e?e.height:null;a.flush();a.flush()};a.flush=function(){ul({withLegend:true,withTransition:false,withTransitionForTransform:false})};a.destroy=function(){a.data.targets=undefined;a.data.xs={};Uf.classed("c3",false).html("");e.onresize=null};if("url"in t.data){u.xhr(t.data.url,function(e,t){var n=u.csv.parseRows(t.response),r;if(n.length===1){r=[{}];n[0].forEach(function(e){r[0][e]=null})}else{r=u.csv.parse(t.response)}$f(r)})}else if("rows"in t.data){$f(ko(t.data.rows))}else if("columns"in t.data){$f(Lo(t.data.columns))}else{throw Error("url or 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diff --git a/htdocs/index.html b/htdocs/index.html
index 64e3044..e75bf57 100644
--- a/htdocs/index.html
+++ b/htdocs/index.html
@@ -44,7 +44,7 @@
               <h3>Specify Axis Min/Max Values</h3>
               <p>You can specify your own min/max values for each axis.</p>
               <p><a class="btn btn-default" href="./samples/axes_minmax.html" role="button">View details &raquo;</a></p>
-            </div>            
+            </div>
           </div>
         </div>
       </div>
@@ -108,6 +108,11 @@
               <p>Display as Bar Chart</p>
               <p><a class="btn btn-default" href="./samples/chart_combination.html" role="button">View details &raquo;</a></p>
             </div>
+            <div class="col-md-4">
+              <h3>Arc Gauge</h3>
+              <p>Display as Arc Gauge</p>
+              <p><a class="btn btn-default" href="./samples/chart_arc_gauge.html" role="button">View details &raquo;</a></p>
+            </div>
           </div>
         </div>
       </div>
diff --git a/htdocs/samples/chart_arc_gauge.html b/htdocs/samples/chart_arc_gauge.html
new file mode 100644
index 0000000..51cb870
--- /dev/null
+++ b/htdocs/samples/chart_arc_gauge.html
@@ -0,0 +1,140 @@
+<html>
+  <head>
+    <link href="/css/c3.css" rel="stylesheet" type="text/css">
+  </head>
+  <body>
+    <div id="chart"></div>
+
+    <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
+    <script src="/js/c3.js"></script>
+    <script>
+      var chart = c3.generate({
+        data: {
+          columns: [
+            [ '%', 91.4 ]
+          ],
+          type: 'gauge'
+        },
+        gauge: {
+    //      color: '', // default value is #e0e0e0 (gray). "color: '', " removes background color (transparent).
+          label: {
+            format: function(value, ratio) {
+              return value;
+            },
+    //        show: false // to turn off the min/max labels.
+          },
+          min: 0,//can handle negative min e.g. vacuum / voltage / current flow / rate of change
+          max: 100,
+          style: 'arc', // Only style currently.
+          units: ' %',
+    //      width: 39 // for adjusting arc thickness
+        },
+        legend: {
+          show: false
+        },
+        size: {
+          height: 240,
+          width: 240
+        },
+        color: {
+          pattern: ['#FF0000', '#F6C600', '#60B044'], // the three color levels for the percentage values.
+          values: ['percentage', 30, 60, 90] // alternate first value is 'value'
+        }
+      });
+
+      var cycleDemo = function () {
+        setTimeout(function () {
+            chart = chart.update(['gauge', 'color'], '');
+        }, 2000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 0 ]]
+            });
+        }, 4000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 50 ]]
+            });
+        }, 5000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 91.4 ]]
+            });
+        }, 6000);
+
+        setTimeout(function () {
+            chart = chart.update(['gauge', 'color'], '#e0e0e0');
+        }, 8000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 0 ]]
+            });
+        }, 10000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 50 ]]
+            });
+        }, 11000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 91.4 ]]
+            });
+        }, 12000);
+
+        setTimeout(function () {
+            chart = chart.update(['gauge', 'width'], 10);
+        }, 14000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 0 ]]
+            });
+        }, 16000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 50 ]]
+            });
+        }, 15000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 91.4 ]]
+            });
+        }, 18000);
+
+        setTimeout(function () {
+            chart = chart.update(['gauge', 'width'], 39);
+        }, 20000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 0 ]]
+            });
+        }, 22000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 50 ]]
+            });
+        }, 23000);
+
+        setTimeout(function () {
+            chart.load({
+              columns: [[ '%', 91.4 ]]
+            });
+        }, 24000);
+      }
+
+      cycleDemo();
+
+      setInterval(cycleDemo, 30000);
+    </script>
+  </body>
+</html>