diff --git a/dist/vivus.js b/dist/vivus.js
index f63a4b4..e33e15c 100644
--- a/dist/vivus.js
+++ b/dist/vivus.js
@@ -1,6 +1,6 @@
 /**
  * vivus - JavaScript library to make drawing animation on SVG
- * @version v0.4.1
+ * @version v0.4.2
  * @link https://github.com/maxwellito/vivus
  * @license MIT
  */
@@ -123,10 +123,28 @@ Pathformer.prototype.rectToPath = function (element) {
       width  = parseFloat(element.width)  || 0,
       height = parseFloat(element.height) || 0;
 
-  newElement.d  = 'M' + x + ' ' + y + ' ';
-  newElement.d += 'L' + (x + width) + ' ' + y + ' ';
-  newElement.d += 'L' + (x + width) + ' ' + (y + height) + ' ';
-  newElement.d += 'L' + x + ' ' + (y + height) + ' Z';
+  if (element.rx || element.ry) {
+    var rx = parseInt(element.rx, 10) || -1,
+        ry = parseInt(element.ry, 10) || -1;
+    rx = Math.min(Math.max(rx < 0 ? ry : rx, 0), width/2);
+    ry = Math.min(Math.max(ry < 0 ? rx : ry, 0), height/2);
+
+    newElement.d = 'M ' + (x + rx) + ',' + y + ' ' +
+                   'L ' + (x + width - rx) + ',' + y + ' ' +
+                   'A ' + rx + ',' + ry + ',0,0,1,' + (x + width) + ',' + (y + ry) + ' ' +
+                   'L ' + (x + width) + ',' + (y + height - ry) + ' ' +
+                   'A ' + rx + ',' + ry + ',0,0,1,' + (x + width - rx) + ',' + (y + height) + ' ' +
+                   'L ' + (x + rx) + ',' + (y + height) + ' ' +
+                   'A ' + rx + ',' + ry + ',0,0,1,' + x + ',' + (y + height - ry) + ' ' +
+                   'L ' + x + ',' + (y + ry) + ' ' +
+                   'A ' + rx + ',' + ry + ',0,0,1,' + (x + rx) + ',' + y;
+  }
+  else {
+    newElement.d = 'M' + x + ' ' + y + ' ' +
+                   'L' + (x + width) + ' ' + y + ' ' +
+                   'L' + (x + width) + ' ' + (y + height) + ' ' +
+                   'L' + x + ' ' + (y + height) + ' Z';
+  }
   return newElement;
 };
 
diff --git a/dist/vivus.min.js b/dist/vivus.min.js
index db2d87d..68977de 100644
--- a/dist/vivus.min.js
+++ b/dist/vivus.min.js
@@ -1,7 +1,7 @@
 /**
  * vivus - JavaScript library to make drawing animation on SVG
- * @version v0.4.1
+ * @version v0.4.2
  * @link https://github.com/maxwellito/vivus
  * @license MIT
  */
-"use strict";!function(){function t(t){if("undefined"==typeof t)throw new Error('Pathformer [constructor]: "element" parameter is required');if(t.constructor===String&&(t=document.getElementById(t),!t))throw new Error('Pathformer [constructor]: "element" parameter is not related to an existing ID');if(!(t instanceof window.SVGElement||t instanceof window.SVGGElement||/^svg$/i.test(t.nodeName)))throw new Error('Pathformer [constructor]: "element" parameter must be a string or a SVGelement');this.el=t,this.scan(t)}function e(t,e,n){r(),this.isReady=!1,this.setElement(t,e),this.setOptions(e),this.setCallback(n),this.isReady&&this.init()}t.prototype.TYPES=["line","ellipse","circle","polygon","polyline","rect"],t.prototype.ATTR_WATCH=["cx","cy","points","r","rx","ry","x","x1","x2","y","y1","y2"],t.prototype.scan=function(t){for(var e,r,n,i,a=t.querySelectorAll(this.TYPES.join(",")),o=0;o<a.length;o++)r=a[o],e=this[r.tagName.toLowerCase()+"ToPath"],n=e(this.parseAttr(r.attributes)),i=this.pathMaker(r,n),r.parentNode.replaceChild(i,r)},t.prototype.lineToPath=function(t){var e={},r=t.x1||0,n=t.y1||0,i=t.x2||0,a=t.y2||0;return e.d="M"+r+","+n+"L"+i+","+a,e},t.prototype.rectToPath=function(t){var e={},r=parseFloat(t.x)||0,n=parseFloat(t.y)||0,i=parseFloat(t.width)||0,a=parseFloat(t.height)||0;return e.d="M"+r+" "+n+" ",e.d+="L"+(r+i)+" "+n+" ",e.d+="L"+(r+i)+" "+(n+a)+" ",e.d+="L"+r+" "+(n+a)+" Z",e},t.prototype.polylineToPath=function(t){var e,r,n={},i=t.points.trim().split(" ");if(-1===t.points.indexOf(",")){var a=[];for(e=0;e<i.length;e+=2)a.push(i[e]+","+i[e+1]);i=a}for(r="M"+i[0],e=1;e<i.length;e++)-1!==i[e].indexOf(",")&&(r+="L"+i[e]);return n.d=r,n},t.prototype.polygonToPath=function(e){var r=t.prototype.polylineToPath(e);return r.d+="Z",r},t.prototype.ellipseToPath=function(t){var e={},r=parseFloat(t.rx)||0,n=parseFloat(t.ry)||0,i=parseFloat(t.cx)||0,a=parseFloat(t.cy)||0,o=i-r,s=a,h=parseFloat(i)+parseFloat(r),l=a;return e.d="M"+o+","+s+"A"+r+","+n+" 0,1,1 "+h+","+l+"A"+r+","+n+" 0,1,1 "+o+","+l,e},t.prototype.circleToPath=function(t){var e={},r=parseFloat(t.r)||0,n=parseFloat(t.cx)||0,i=parseFloat(t.cy)||0,a=n-r,o=i,s=parseFloat(n)+parseFloat(r),h=i;return e.d="M"+a+","+o+"A"+r+","+r+" 0,1,1 "+s+","+h+"A"+r+","+r+" 0,1,1 "+a+","+h,e},t.prototype.pathMaker=function(t,e){var r,n,i=document.createElementNS("http://www.w3.org/2000/svg","path");for(r=0;r<t.attributes.length;r++)n=t.attributes[r],-1===this.ATTR_WATCH.indexOf(n.name)&&i.setAttribute(n.name,n.value);for(r in e)i.setAttribute(r,e[r]);return i},t.prototype.parseAttr=function(t){for(var e,r={},n=0;n<t.length;n++){if(e=t[n],-1!==this.ATTR_WATCH.indexOf(e.name)&&-1!==e.value.indexOf("%"))throw new Error("Pathformer [parseAttr]: a SVG shape got values in percentage. This cannot be transformed into 'path' tags. Please use 'viewBox'.");r[e.name]=e.value}return r};var r,n,i,a;e.LINEAR=function(t){return t},e.EASE=function(t){return-Math.cos(t*Math.PI)/2+.5},e.EASE_OUT=function(t){return 1-Math.pow(1-t,3)},e.EASE_IN=function(t){return Math.pow(t,3)},e.EASE_OUT_BOUNCE=function(t){var e=-Math.cos(.5*t*Math.PI)+1,r=Math.pow(e,1.5),n=Math.pow(1-t,2),i=-Math.abs(Math.cos(2.5*r*Math.PI))+1;return 1-n+i*n},e.prototype.setElement=function(t,e){if("undefined"==typeof t)throw new Error('Vivus [constructor]: "element" parameter is required');if(t.constructor===String&&(t=document.getElementById(t),!t))throw new Error('Vivus [constructor]: "element" parameter is not related to an existing ID');if(this.parentEl=t,e&&e.file){var r=document.createElement("object");r.setAttribute("type","image/svg+xml"),r.setAttribute("data",e.file),r.setAttribute("built-by-vivus","true"),t.appendChild(r),t=r}switch(t.constructor){case window.SVGSVGElement:case window.SVGElement:case window.SVGGElement:this.el=t,this.isReady=!0;break;case window.HTMLObjectElement:var n,i;i=this,n=function(e){if(!i.isReady){if(i.el=t.contentDocument&&t.contentDocument.querySelector("svg"),!i.el&&e)throw new Error("Vivus [constructor]: object loaded does not contain any SVG");return i.el?(t.getAttribute("built-by-vivus")&&(i.parentEl.insertBefore(i.el,t),i.parentEl.removeChild(t),i.el.setAttribute("width","100%"),i.el.setAttribute("height","100%")),i.isReady=!0,i.init(),!0):void 0}},n()||t.addEventListener("load",n);break;default:throw new Error('Vivus [constructor]: "element" parameter is not valid (or miss the "file" attribute)')}},e.prototype.setOptions=function(t){var r=["delayed","sync","async","nsync","oneByOne","scenario","scenario-sync"],n=["inViewport","manual","autostart"];if(void 0!==t&&t.constructor!==Object)throw new Error('Vivus [constructor]: "options" parameter must be an object');if(t=t||{},t.type&&-1===r.indexOf(t.type))throw new Error("Vivus [constructor]: "+t.type+" is not an existing animation `type`");if(this.type=t.type||r[0],t.start&&-1===n.indexOf(t.start))throw new Error("Vivus [constructor]: "+t.start+" is not an existing `start` option");if(this.start=t.start||n[0],this.isIE=-1!==window.navigator.userAgent.indexOf("MSIE")||-1!==window.navigator.userAgent.indexOf("Trident/")||-1!==window.navigator.userAgent.indexOf("Edge/"),this.duration=a(t.duration,120),this.delay=a(t.delay,null),this.dashGap=a(t.dashGap,1),this.forceRender=t.hasOwnProperty("forceRender")?!!t.forceRender:this.isIE,this.reverseStack=!!t.reverseStack,this.selfDestroy=!!t.selfDestroy,this.onReady=t.onReady,this.map=[],this.frameLength=this.currentFrame=this.delayUnit=this.speed=this.handle=null,this.ignoreInvisible=t.hasOwnProperty("ignoreInvisible")?!!t.ignoreInvisible:!1,this.animTimingFunction=t.animTimingFunction||e.LINEAR,this.pathTimingFunction=t.pathTimingFunction||e.LINEAR,this.delay>=this.duration)throw new Error("Vivus [constructor]: delay must be shorter than duration")},e.prototype.setCallback=function(t){if(t&&t.constructor!==Function)throw new Error('Vivus [constructor]: "callback" parameter must be a function');this.callback=t||function(){}},e.prototype.mapping=function(){var t,e,r,n,i,o,s,h;for(h=o=s=0,e=this.el.querySelectorAll("path"),t=0;t<e.length;t++)r=e[t],this.isInvisible(r)||(i={el:r,length:Math.ceil(r.getTotalLength())},isNaN(i.length)?window.console&&console.warn&&console.warn("Vivus [mapping]: cannot retrieve a path element length",r):(this.map.push(i),r.style.strokeDasharray=i.length+" "+(i.length+2*this.dashGap),r.style.strokeDashoffset=i.length+this.dashGap,i.length+=this.dashGap,o+=i.length,this.renderPath(t)));for(o=0===o?1:o,this.delay=null===this.delay?this.duration/3:this.delay,this.delayUnit=this.delay/(e.length>1?e.length-1:1),this.reverseStack&&this.map.reverse(),t=0;t<this.map.length;t++){switch(i=this.map[t],this.type){case"delayed":i.startAt=this.delayUnit*t,i.duration=this.duration-this.delay;break;case"oneByOne":i.startAt=s/o*this.duration,i.duration=i.length/o*this.duration;break;case"sync":case"async":case"nsync":i.startAt=0,i.duration=this.duration;break;case"scenario-sync":r=i.el,n=this.parseAttr(r),i.startAt=h+(a(n["data-delay"],this.delayUnit)||0),i.duration=a(n["data-duration"],this.duration),h=void 0!==n["data-async"]?i.startAt:i.startAt+i.duration,this.frameLength=Math.max(this.frameLength,i.startAt+i.duration);break;case"scenario":r=i.el,n=this.parseAttr(r),i.startAt=a(n["data-start"],this.delayUnit)||0,i.duration=a(n["data-duration"],this.duration),this.frameLength=Math.max(this.frameLength,i.startAt+i.duration)}s+=i.length,this.frameLength=this.frameLength||this.duration}},e.prototype.drawer=function(){var t=this;if(this.currentFrame+=this.speed,this.currentFrame<=0)this.stop(),this.reset();else{if(!(this.currentFrame>=this.frameLength))return this.trace(),this.handle=n(function(){t.drawer()}),void 0;this.stop(),this.currentFrame=this.frameLength,this.trace(),this.selfDestroy&&this.destroy()}this.callback(this),this.instanceCallback&&(this.instanceCallback(this),this.instanceCallback=null)},e.prototype.trace=function(){var t,e,r,n;for(n=this.animTimingFunction(this.currentFrame/this.frameLength)*this.frameLength,t=0;t<this.map.length;t++)r=this.map[t],e=(n-r.startAt)/r.duration,e=this.pathTimingFunction(Math.max(0,Math.min(1,e))),r.progress!==e&&(r.progress=e,r.el.style.strokeDashoffset=Math.floor(r.length*(1-e)),this.renderPath(t))},e.prototype.renderPath=function(t){if(this.forceRender&&this.map&&this.map[t]){var e=this.map[t],r=e.el.cloneNode(!0);e.el.parentNode.replaceChild(r,e.el),e.el=r}},e.prototype.init=function(){this.frameLength=0,this.currentFrame=0,this.map=[],new t(this.el),this.mapping(),this.starter(),this.onReady&&this.onReady(this)},e.prototype.starter=function(){switch(this.start){case"manual":return;case"autostart":this.play();break;case"inViewport":var t=this,e=function(){t.isInViewport(t.parentEl,1)&&(t.play(),window.removeEventListener("scroll",e))};window.addEventListener("scroll",e),e()}},e.prototype.getStatus=function(){return 0===this.currentFrame?"start":this.currentFrame===this.frameLength?"end":"progress"},e.prototype.reset=function(){return this.setFrameProgress(0)},e.prototype.finish=function(){return this.setFrameProgress(1)},e.prototype.setFrameProgress=function(t){return t=Math.min(1,Math.max(0,t)),this.currentFrame=Math.round(this.frameLength*t),this.trace(),this},e.prototype.play=function(t,e){if(this.instanceCallback=null,t&&"function"==typeof t)this.instanceCallback=t,t=null;else if(t&&"number"!=typeof t)throw new Error("Vivus [play]: invalid speed");return e&&"function"==typeof e&&!this.instanceCallback&&(this.instanceCallback=e),this.speed=t||1,this.handle||this.drawer(),this},e.prototype.stop=function(){return this.handle&&(i(this.handle),this.handle=null),this},e.prototype.destroy=function(){this.stop();var t,e;for(t=0;t<this.map.length;t++)e=this.map[t],e.el.style.strokeDashoffset=null,e.el.style.strokeDasharray=null,this.renderPath(t)},e.prototype.isInvisible=function(t){var e,r=t.getAttribute("data-ignore");return null!==r?"false"!==r:this.ignoreInvisible?(e=t.getBoundingClientRect(),!e.width&&!e.height):!1},e.prototype.parseAttr=function(t){var e,r={};if(t&&t.attributes)for(var n=0;n<t.attributes.length;n++)e=t.attributes[n],r[e.name]=e.value;return r},e.prototype.isInViewport=function(t,e){var r=this.scrollY(),n=r+this.getViewportH(),i=t.getBoundingClientRect(),a=i.height,o=r+i.top,s=o+a;return e=e||0,n>=o+a*e&&s>=r},e.prototype.getViewportH=function(){var t=this.docElem.clientHeight,e=window.innerHeight;return e>t?e:t},e.prototype.scrollY=function(){return window.pageYOffset||this.docElem.scrollTop},r=function(){e.prototype.docElem||(e.prototype.docElem=window.document.documentElement,n=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(t){return window.setTimeout(t,1e3/60)}}(),i=function(){return window.cancelAnimationFrame||window.webkitCancelAnimationFrame||window.mozCancelAnimationFrame||window.oCancelAnimationFrame||window.msCancelAnimationFrame||function(t){return window.clearTimeout(t)}}())},a=function(t,e){var r=parseInt(t,10);return r>=0?r:e},"function"==typeof define&&define.amd?define([],function(){return e}):"object"==typeof exports?module.exports=e:window.Vivus=e}();
\ No newline at end of file
+"use strict";!function(){function t(t){if("undefined"==typeof t)throw new Error('Pathformer [constructor]: "element" parameter is required');if(t.constructor===String&&(t=document.getElementById(t),!t))throw new Error('Pathformer [constructor]: "element" parameter is not related to an existing ID');if(!(t instanceof window.SVGElement||t instanceof window.SVGGElement||/^svg$/i.test(t.nodeName)))throw new Error('Pathformer [constructor]: "element" parameter must be a string or a SVGelement');this.el=t,this.scan(t)}function e(t,e,n){r(),this.isReady=!1,this.setElement(t,e),this.setOptions(e),this.setCallback(n),this.isReady&&this.init()}t.prototype.TYPES=["line","ellipse","circle","polygon","polyline","rect"],t.prototype.ATTR_WATCH=["cx","cy","points","r","rx","ry","x","x1","x2","y","y1","y2"],t.prototype.scan=function(t){for(var e,r,n,i,a=t.querySelectorAll(this.TYPES.join(",")),o=0;o<a.length;o++)r=a[o],e=this[r.tagName.toLowerCase()+"ToPath"],n=e(this.parseAttr(r.attributes)),i=this.pathMaker(r,n),r.parentNode.replaceChild(i,r)},t.prototype.lineToPath=function(t){var e={},r=t.x1||0,n=t.y1||0,i=t.x2||0,a=t.y2||0;return e.d="M"+r+","+n+"L"+i+","+a,e},t.prototype.rectToPath=function(t){var e={},r=parseFloat(t.x)||0,n=parseFloat(t.y)||0,i=parseFloat(t.width)||0,a=parseFloat(t.height)||0;if(t.rx||t.ry){var o=parseInt(t.rx,10)||-1,s=parseInt(t.ry,10)||-1;o=Math.min(Math.max(0>o?s:o,0),i/2),s=Math.min(Math.max(0>s?o:s,0),a/2),e.d="M "+(r+o)+","+n+" L "+(r+i-o)+","+n+" A "+o+","+s+",0,0,1,"+(r+i)+","+(n+s)+" L "+(r+i)+","+(n+a-s)+" A "+o+","+s+",0,0,1,"+(r+i-o)+","+(n+a)+" L "+(r+o)+","+(n+a)+" A "+o+","+s+",0,0,1,"+r+","+(n+a-s)+" L "+r+","+(n+s)+" A "+o+","+s+",0,0,1,"+(r+o)+","+n}else e.d="M"+r+" "+n+" L"+(r+i)+" "+n+" L"+(r+i)+" "+(n+a)+" L"+r+" "+(n+a)+" Z";return e},t.prototype.polylineToPath=function(t){var e,r,n={},i=t.points.trim().split(" ");if(-1===t.points.indexOf(",")){var a=[];for(e=0;e<i.length;e+=2)a.push(i[e]+","+i[e+1]);i=a}for(r="M"+i[0],e=1;e<i.length;e++)-1!==i[e].indexOf(",")&&(r+="L"+i[e]);return n.d=r,n},t.prototype.polygonToPath=function(e){var r=t.prototype.polylineToPath(e);return r.d+="Z",r},t.prototype.ellipseToPath=function(t){var e={},r=parseFloat(t.rx)||0,n=parseFloat(t.ry)||0,i=parseFloat(t.cx)||0,a=parseFloat(t.cy)||0,o=i-r,s=a,h=parseFloat(i)+parseFloat(r),l=a;return e.d="M"+o+","+s+"A"+r+","+n+" 0,1,1 "+h+","+l+"A"+r+","+n+" 0,1,1 "+o+","+l,e},t.prototype.circleToPath=function(t){var e={},r=parseFloat(t.r)||0,n=parseFloat(t.cx)||0,i=parseFloat(t.cy)||0,a=n-r,o=i,s=parseFloat(n)+parseFloat(r),h=i;return e.d="M"+a+","+o+"A"+r+","+r+" 0,1,1 "+s+","+h+"A"+r+","+r+" 0,1,1 "+a+","+h,e},t.prototype.pathMaker=function(t,e){var r,n,i=document.createElementNS("http://www.w3.org/2000/svg","path");for(r=0;r<t.attributes.length;r++)n=t.attributes[r],-1===this.ATTR_WATCH.indexOf(n.name)&&i.setAttribute(n.name,n.value);for(r in e)i.setAttribute(r,e[r]);return i},t.prototype.parseAttr=function(t){for(var e,r={},n=0;n<t.length;n++){if(e=t[n],-1!==this.ATTR_WATCH.indexOf(e.name)&&-1!==e.value.indexOf("%"))throw new Error("Pathformer [parseAttr]: a SVG shape got values in percentage. This cannot be transformed into 'path' tags. Please use 'viewBox'.");r[e.name]=e.value}return r};var r,n,i,a;e.LINEAR=function(t){return t},e.EASE=function(t){return-Math.cos(t*Math.PI)/2+.5},e.EASE_OUT=function(t){return 1-Math.pow(1-t,3)},e.EASE_IN=function(t){return Math.pow(t,3)},e.EASE_OUT_BOUNCE=function(t){var e=-Math.cos(.5*t*Math.PI)+1,r=Math.pow(e,1.5),n=Math.pow(1-t,2),i=-Math.abs(Math.cos(2.5*r*Math.PI))+1;return 1-n+i*n},e.prototype.setElement=function(t,e){if("undefined"==typeof t)throw new Error('Vivus [constructor]: "element" parameter is required');if(t.constructor===String&&(t=document.getElementById(t),!t))throw new Error('Vivus [constructor]: "element" parameter is not related to an existing ID');if(this.parentEl=t,e&&e.file){var r=document.createElement("object");r.setAttribute("type","image/svg+xml"),r.setAttribute("data",e.file),r.setAttribute("built-by-vivus","true"),t.appendChild(r),t=r}switch(t.constructor){case window.SVGSVGElement:case window.SVGElement:case window.SVGGElement:this.el=t,this.isReady=!0;break;case window.HTMLObjectElement:var n,i;i=this,n=function(e){if(!i.isReady){if(i.el=t.contentDocument&&t.contentDocument.querySelector("svg"),!i.el&&e)throw new Error("Vivus [constructor]: object loaded does not contain any SVG");return i.el?(t.getAttribute("built-by-vivus")&&(i.parentEl.insertBefore(i.el,t),i.parentEl.removeChild(t),i.el.setAttribute("width","100%"),i.el.setAttribute("height","100%")),i.isReady=!0,i.init(),!0):void 0}},n()||t.addEventListener("load",n);break;default:throw new Error('Vivus [constructor]: "element" parameter is not valid (or miss the "file" attribute)')}},e.prototype.setOptions=function(t){var r=["delayed","sync","async","nsync","oneByOne","scenario","scenario-sync"],n=["inViewport","manual","autostart"];if(void 0!==t&&t.constructor!==Object)throw new Error('Vivus [constructor]: "options" parameter must be an object');if(t=t||{},t.type&&-1===r.indexOf(t.type))throw new Error("Vivus [constructor]: "+t.type+" is not an existing animation `type`");if(this.type=t.type||r[0],t.start&&-1===n.indexOf(t.start))throw new Error("Vivus [constructor]: "+t.start+" is not an existing `start` option");if(this.start=t.start||n[0],this.isIE=-1!==window.navigator.userAgent.indexOf("MSIE")||-1!==window.navigator.userAgent.indexOf("Trident/")||-1!==window.navigator.userAgent.indexOf("Edge/"),this.duration=a(t.duration,120),this.delay=a(t.delay,null),this.dashGap=a(t.dashGap,1),this.forceRender=t.hasOwnProperty("forceRender")?!!t.forceRender:this.isIE,this.reverseStack=!!t.reverseStack,this.selfDestroy=!!t.selfDestroy,this.onReady=t.onReady,this.map=[],this.frameLength=this.currentFrame=this.delayUnit=this.speed=this.handle=null,this.ignoreInvisible=t.hasOwnProperty("ignoreInvisible")?!!t.ignoreInvisible:!1,this.animTimingFunction=t.animTimingFunction||e.LINEAR,this.pathTimingFunction=t.pathTimingFunction||e.LINEAR,this.delay>=this.duration)throw new Error("Vivus [constructor]: delay must be shorter than duration")},e.prototype.setCallback=function(t){if(t&&t.constructor!==Function)throw new Error('Vivus [constructor]: "callback" parameter must be a function');this.callback=t||function(){}},e.prototype.mapping=function(){var t,e,r,n,i,o,s,h;for(h=o=s=0,e=this.el.querySelectorAll("path"),t=0;t<e.length;t++)r=e[t],this.isInvisible(r)||(i={el:r,length:Math.ceil(r.getTotalLength())},isNaN(i.length)?window.console&&console.warn&&console.warn("Vivus [mapping]: cannot retrieve a path element length",r):(this.map.push(i),r.style.strokeDasharray=i.length+" "+(i.length+2*this.dashGap),r.style.strokeDashoffset=i.length+this.dashGap,i.length+=this.dashGap,o+=i.length,this.renderPath(t)));for(o=0===o?1:o,this.delay=null===this.delay?this.duration/3:this.delay,this.delayUnit=this.delay/(e.length>1?e.length-1:1),this.reverseStack&&this.map.reverse(),t=0;t<this.map.length;t++){switch(i=this.map[t],this.type){case"delayed":i.startAt=this.delayUnit*t,i.duration=this.duration-this.delay;break;case"oneByOne":i.startAt=s/o*this.duration,i.duration=i.length/o*this.duration;break;case"sync":case"async":case"nsync":i.startAt=0,i.duration=this.duration;break;case"scenario-sync":r=i.el,n=this.parseAttr(r),i.startAt=h+(a(n["data-delay"],this.delayUnit)||0),i.duration=a(n["data-duration"],this.duration),h=void 0!==n["data-async"]?i.startAt:i.startAt+i.duration,this.frameLength=Math.max(this.frameLength,i.startAt+i.duration);break;case"scenario":r=i.el,n=this.parseAttr(r),i.startAt=a(n["data-start"],this.delayUnit)||0,i.duration=a(n["data-duration"],this.duration),this.frameLength=Math.max(this.frameLength,i.startAt+i.duration)}s+=i.length,this.frameLength=this.frameLength||this.duration}},e.prototype.drawer=function(){var t=this;if(this.currentFrame+=this.speed,this.currentFrame<=0)this.stop(),this.reset();else{if(!(this.currentFrame>=this.frameLength))return this.trace(),this.handle=n(function(){t.drawer()}),void 0;this.stop(),this.currentFrame=this.frameLength,this.trace(),this.selfDestroy&&this.destroy()}this.callback(this),this.instanceCallback&&(this.instanceCallback(this),this.instanceCallback=null)},e.prototype.trace=function(){var t,e,r,n;for(n=this.animTimingFunction(this.currentFrame/this.frameLength)*this.frameLength,t=0;t<this.map.length;t++)r=this.map[t],e=(n-r.startAt)/r.duration,e=this.pathTimingFunction(Math.max(0,Math.min(1,e))),r.progress!==e&&(r.progress=e,r.el.style.strokeDashoffset=Math.floor(r.length*(1-e)),this.renderPath(t))},e.prototype.renderPath=function(t){if(this.forceRender&&this.map&&this.map[t]){var e=this.map[t],r=e.el.cloneNode(!0);e.el.parentNode.replaceChild(r,e.el),e.el=r}},e.prototype.init=function(){this.frameLength=0,this.currentFrame=0,this.map=[],new t(this.el),this.mapping(),this.starter(),this.onReady&&this.onReady(this)},e.prototype.starter=function(){switch(this.start){case"manual":return;case"autostart":this.play();break;case"inViewport":var t=this,e=function(){t.isInViewport(t.parentEl,1)&&(t.play(),window.removeEventListener("scroll",e))};window.addEventListener("scroll",e),e()}},e.prototype.getStatus=function(){return 0===this.currentFrame?"start":this.currentFrame===this.frameLength?"end":"progress"},e.prototype.reset=function(){return this.setFrameProgress(0)},e.prototype.finish=function(){return this.setFrameProgress(1)},e.prototype.setFrameProgress=function(t){return t=Math.min(1,Math.max(0,t)),this.currentFrame=Math.round(this.frameLength*t),this.trace(),this},e.prototype.play=function(t,e){if(this.instanceCallback=null,t&&"function"==typeof t)this.instanceCallback=t,t=null;else if(t&&"number"!=typeof t)throw new Error("Vivus [play]: invalid speed");return e&&"function"==typeof e&&!this.instanceCallback&&(this.instanceCallback=e),this.speed=t||1,this.handle||this.drawer(),this},e.prototype.stop=function(){return this.handle&&(i(this.handle),this.handle=null),this},e.prototype.destroy=function(){this.stop();var t,e;for(t=0;t<this.map.length;t++)e=this.map[t],e.el.style.strokeDashoffset=null,e.el.style.strokeDasharray=null,this.renderPath(t)},e.prototype.isInvisible=function(t){var e,r=t.getAttribute("data-ignore");return null!==r?"false"!==r:this.ignoreInvisible?(e=t.getBoundingClientRect(),!e.width&&!e.height):!1},e.prototype.parseAttr=function(t){var e,r={};if(t&&t.attributes)for(var n=0;n<t.attributes.length;n++)e=t.attributes[n],r[e.name]=e.value;return r},e.prototype.isInViewport=function(t,e){var r=this.scrollY(),n=r+this.getViewportH(),i=t.getBoundingClientRect(),a=i.height,o=r+i.top,s=o+a;return e=e||0,n>=o+a*e&&s>=r},e.prototype.getViewportH=function(){var t=this.docElem.clientHeight,e=window.innerHeight;return e>t?e:t},e.prototype.scrollY=function(){return window.pageYOffset||this.docElem.scrollTop},r=function(){e.prototype.docElem||(e.prototype.docElem=window.document.documentElement,n=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(t){return window.setTimeout(t,1e3/60)}}(),i=function(){return window.cancelAnimationFrame||window.webkitCancelAnimationFrame||window.mozCancelAnimationFrame||window.oCancelAnimationFrame||window.msCancelAnimationFrame||function(t){return window.clearTimeout(t)}}())},a=function(t,e){var r=parseInt(t,10);return r>=0?r:e},"function"==typeof define&&define.amd?define([],function(){return e}):"object"==typeof exports?module.exports=e:window.Vivus=e}();
\ No newline at end of file
diff --git a/package.json b/package.json
index c3a6db6..cbfcd80 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vivus",
-  "version": "0.4.2",
+  "version": "0.4.3",
   "description": "JavaScript library to make drawing animation on SVG",
   "main": "dist/vivus.js",
   "scripts": {
diff --git a/src/pathformer.js b/src/pathformer.js
index ec0e9ad..0674713 100755
--- a/src/pathformer.js
+++ b/src/pathformer.js
@@ -112,10 +112,28 @@ Pathformer.prototype.rectToPath = function (element) {
       width  = parseFloat(element.width)  || 0,
       height = parseFloat(element.height) || 0;
 
-  newElement.d  = 'M' + x + ' ' + y + ' ';
-  newElement.d += 'L' + (x + width) + ' ' + y + ' ';
-  newElement.d += 'L' + (x + width) + ' ' + (y + height) + ' ';
-  newElement.d += 'L' + x + ' ' + (y + height) + ' Z';
+  if (element.rx || element.ry) {
+    var rx = parseInt(element.rx, 10) || -1,
+        ry = parseInt(element.ry, 10) || -1;
+    rx = Math.min(Math.max(rx < 0 ? ry : rx, 0), width/2);
+    ry = Math.min(Math.max(ry < 0 ? rx : ry, 0), height/2);
+
+    newElement.d = 'M ' + (x + rx) + ',' + y + ' ' +
+                   'L ' + (x + width - rx) + ',' + y + ' ' +
+                   'A ' + rx + ',' + ry + ',0,0,1,' + (x + width) + ',' + (y + ry) + ' ' +
+                   'L ' + (x + width) + ',' + (y + height - ry) + ' ' +
+                   'A ' + rx + ',' + ry + ',0,0,1,' + (x + width - rx) + ',' + (y + height) + ' ' +
+                   'L ' + (x + rx) + ',' + (y + height) + ' ' +
+                   'A ' + rx + ',' + ry + ',0,0,1,' + x + ',' + (y + height - ry) + ' ' +
+                   'L ' + x + ',' + (y + ry) + ' ' +
+                   'A ' + rx + ',' + ry + ',0,0,1,' + (x + rx) + ',' + y;
+  }
+  else {
+    newElement.d = 'M' + x + ' ' + y + ' ' +
+                   'L' + (x + width) + ' ' + y + ' ' +
+                   'L' + (x + width) + ' ' + (y + height) + ' ' +
+                   'L' + x + ' ' + (y + height) + ' Z';
+  }
   return newElement;
 };
 
diff --git a/test/unit/pathformer.spec.js b/test/unit/pathformer.spec.js
index a07ec16..109f4b1 100644
--- a/test/unit/pathformer.spec.js
+++ b/test/unit/pathformer.spec.js
@@ -130,6 +130,34 @@ describe('Pathformer', function () {
         expect(output.d.indexOf('0')).not.toEqual(-1);
         expect(output.d.indexOf('undefined')).toEqual(-1);
       });
+
+      it('should apply rounded corners', function () {
+        var result = 'M 50,10 ' +
+          'L 50,10 A 40,20,0,0,1,90,30 ' +
+          'L 90,50 A 40,20,0,0,1,50,70 ' +
+          'L 50,70 A 40,20,0,0,1,10,50 ' +
+          'L 10,30 A 40,20,0,0,1,50,10';
+
+        var output = Pathformer.prototype.rectToPath({
+          x:10, y:10, width:80, height:60, rx:100, ry:20
+        });
+
+        expect(output.d).toEqual(result);
+      });
+
+      it('should apply rounded corners even when a value is missing', function () {
+        var result = 'M 30,10 ' +
+          'L 70,10 A 20,20,0,0,1,90,30 ' +
+          'L 90,50 A 20,20,0,0,1,70,70 ' +
+          'L 30,70 A 20,20,0,0,1,10,50 ' +
+          'L 10,30 A 20,20,0,0,1,30,10';
+
+        var output = Pathformer.prototype.rectToPath({
+          x:10, y:10, width:80, height:60,  ry:20
+        });
+
+        expect(output.d).toEqual(result);
+      });
     });
 
     // Polyline object