Simplified rotate() syntax

4 files changed, 23 insertions, 13 deletions

diff --git a/README.md b/README.md
index b47fbc4..66668e5 100644
--- a/README.md
+++ b/README.md
@@ -187,9 +187,9 @@ rect.stroke({ color: '#f06', opacity: 0.6, width: 5 });
 ### Rotate
 The 'rotate()' method will automatically rotate elements according to the centre of the element:
 ```javascript
-rect.rotate({ deg: 45 });
+rect.rotate(45);
 ```
-But you also define a rotation point:
+Unless you also define a rotation point:
 ```javascript
 rect.rotate({ deg: 45, x: 100, y: 100 });
 ```
diff --git a/dist/svg.js b/dist/svg.js
index 57f8038..ccfa3d6 100644
--- a/dist/svg.js
+++ b/dist/svg.js
@@ -1,4 +1,4 @@
-/* svg.js v0.1-7-g0c4be8f - svg container element group arrange defs clip gradient doc shape rect circle ellipse path image text sugar - svgjs.com/license */
+/* svg.js v0.1-10-gffcc6f4 - svg container element group arrange defs clip gradient doc shape rect circle ellipse path image text sugar - svgjs.com/license */
 (function() {
 
   this.SVG = {
@@ -730,10 +730,15 @@
     rotate: function(o) {
       var b = this.bbox();
       
-      if (o.x == null) o.x = b.cx;
-      if (o.y == null) o.y = b.cy;
-  
-      return this.transform('rotate(' + (o.deg || 0) + ' ' + o.x + ' ' + o.y + ')', o.relative);
+      if (typeof o == 'number')
+        o = { deg: o };
+      
+      return this.transform(
+        'rotate(' +
+        (o.deg || 0) + ' ' +
+        (o.x == null ? b.cx : o.x) + ' ' +
+        (o.y == null ? b.cx : o.y) + ')',
+      o.relative);
     }
     
   });
diff --git a/dist/svg.min.js b/dist/svg.min.js
index 77890e9..39edc6a 100644
--- a/dist/svg.min.js
+++ b/dist/svg.min.js
@@ -1,2 +1,2 @@
-/* svg.js v0.1-7-g0c4be8f - svg container element group arrange defs clip gradient doc shape rect circle ellipse path image text sugar - svgjs.com/license */
-function svg(e){return new SVG.Doc(e)}(function(){function n(){this.constructor.call(this,SVG.create("tspan"))}this.SVG={ns:"http://www.w3.org/2000/svg",xlink:"http://www.w3.org/1999/xlink",create:function(e){return document.createElementNS(this.ns,e)},extend:function(e,t){for(var n in t)e.prototype[n]=t[n]}},SVG.Container={add:function(e,t){return this.has(e)||(t=t==null?this.children().length:t,this.children().splice(t,0,e),this.node.insertBefore(e.node,this.node.childNodes[t]),e.parent=this),this},has:function(e){return this.children().indexOf(e)>=0},children:function(){return this._children||(this._children=[])},remove:function(e){return this.removeAt(this.children().indexOf(e))},removeAt:function(e){if(0<=e&&e<this.children().length){var t=this.children()[e];this.children().splice(e,1),this.node.removeChild(t.node),t.parent=null}return this},defs:function(){return this._defs==null&&(this._defs=new SVG.Defs,this.add(this._defs,0)),this._defs},levelDefs:function(){var e=this.defs();return this.remove(e).add(e,0),this},group:function(){var e=new SVG.G;return this.add(e),e},rect:function(e,t){var n=(new SVG.Rect).size(e,t);return this.add(n),n},circle:function(e){var t=(new SVG.Circle).size(e);return this.add(t),t},ellipse:function(e,t){var n=(new SVG.Ellipse).size(e,t);return this.add(n),n},path:function(e){var t=(new SVG.Path).plot(e);return this.add(t),t},image:function(e){var t=(new SVG.Image).load(e);return this.add(t),t},text:function(e){var t=(new SVG.Text).text(e);return this.add(t),t},gradient:function(e,t){return this.defs().gradient(e,t)}},SVG.Element=function(t){this.node=t,this.attrs={},this._s="size family weight stretch variant style".split(" ")},SVG.extend(SVG.Element,{move:function(e,t){return this.attr({x:e,y:t})},size:function(e,t){return this.attr({width:e,height:t})},remove:function(){return this.parent!=null?this.parent.remove(this):void 0},parentDoc:function(){return this._parent(SVG.Doc)},mother:function(){return this.parentDoc()},attr:function(e,t,n){if(arguments.length<2){if(typeof e!="object")return this._isStyle(e)?e=="text"?this.content:e=="leading"?this[e]:this.style[e]:this.attrs[e];for(t in e)this.attr(t,e[t])}else{this.attrs[e]=t;if(e=="x"&&this._isText())for(var r=this.lines.length-1;r>=0;r--)this.lines[r].attr(e,t);else n!=null?this.node.setAttributeNS(n,e,t):this.node.setAttribute(e,t);this._isStyle(e)&&(e=="text"?this.text(t):e=="leading"?this[e]=t:this.style[e]=t,this.text(this.content))}return this},transform:function(e,t){var n=[],r=this.attr("transform")||"",i=r.match(/([a-z]+\([^\)]+\))/g)||[];if(t!==!0){var s=e.match(/^([A-Za-z\-]+)/)[1],t=new RegExp("^"+s);for(var o=0,r=i.length;o<r;o++)t.test(i[o])||n.push(i[o])}else n=i;return n.push(e),this.attr("transform",n.join(" "))},bbox:function(){var e=this.node.getBBox();return e.cx=e.x+e.width/2,e.cy=e.y+e.height/2,e},_parent:function(e){var t=this;while(t!=null&&!(t instanceof e))t=t.parent;return t},_isStyle:function(e){return typeof e=="string"&&this._isText()?/^font|text|leading/.test(e):!1},_isText:function(){return this instanceof SVG.Text}}),SVG.G=function(){this.constructor.call(this,SVG.create("g"))},SVG.G.prototype=new SVG.Element,SVG.extend(SVG.G,SVG.Container),SVG.extend(SVG.Element,{siblings:function(){return this.mother().children()},forward:function(){var e=this.siblings().indexOf(this);return this.mother().remove(this).add(this,e+1),this},backward:function(){var e,t=this.mother().levelDefs();return e=this.siblings().indexOf(this),e>1&&t.remove(this).add(this,e-1),this},front:function(){return this.mother().remove(this).add(this),this},back:function(){var e,t=this.mother().levelDefs();return e=this.siblings().indexOf(this),e>1&&t.remove(this).add(this,0),this}}),SVG.Defs=function(){this.constructor.call(this,SVG.create("defs"))},SVG.Defs.prototype=new SVG.Element,SVG.extend(SVG.Defs,SVG.Container);var e=0;SVG.Clip=function(){this.constructor.call(this,SVG.create("clipPath")),this.id="svgjs_clip_"+e++,this.attr("id",this.id)},SVG.Clip.prototype=new SVG.Element,SVG.extend(SVG.Clip,SVG.Container),SVG.extend(SVG.Element,{clip:function(e){var t=this.mother().defs().clip();return e(t),this.clipTo(t)},clipTo:function(e){return this.attr("clip-path","url(#"+e.id+")")}}),SVG.extend(SVG.Defs,{clip:function(){var e=new SVG.Clip;return this.add(e),e}});var t=0;SVG.Gradient=function(n){this.constructor.call(this,SVG.create(n+"Gradient")),this.id="svgjs_grad_"+t++,this.type=n,this.attr("id",this.id)},SVG.Gradient.prototype=new SVG.Element,SVG.extend(SVG.Gradient,SVG.Container),SVG.extend(SVG.Gradient,{from:function(e,t){return this.type=="radial"?this.attr({fx:e+"%",fy:t+"%"}):this.attr({x1:e+"%",y1:t+"%"})},to:function(e,t){return this.type=="radial"?this.attr({cx:e+"%",cy:t+"%"}):this.attr({x2:e+"%",y2:t+"%"})},radius:function(e){return this.type=="radial"?this.attr({r:e+"%"}):this},at:function(e){var t=new SVG.Stop(e);return this.add(t),t},update:function(e){while(this.node.hasChildNodes())this.node.removeChild(this.node.lastChild);return e(this),this},fill:function(){return"url(#"+this.id+")"}}),SVG.extend(SVG.Defs,{gradient:function(e,t){var n=new SVG.Gradient(e);return this.add(n),t(n),n}}),SVG.Stop=function(t){this.constructor.call(this,SVG.create("stop")),this.update(t)},SVG.Stop.prototype=new SVG.Element,SVG.extend(SVG.Stop,{update:function(e){var t="",n=["opacity","color"];for(var r=n.length-1;r>=0;r--)e[n[r]]!=null&&(t+="stop-"+n[r]+":"+e[n[r]]+";");return this.attr({offset:(e.offset!=null?e.offset:this.attr("offset")||0)+"%",style:t})}}),SVG.Doc=function(t){this.constructor.call(this,SVG.create("svg")),typeof t=="string"&&(t=document.getElementById(t)),this.attr({xmlns:SVG.ns,version:"1.1"}).attr("xlink",SVG.xlink,SVG.ns).size(t.offsetWidth,t.offsetHeight).defs(),t.appendChild(this.node)},SVG.Doc.prototype=new SVG.Element,SVG.extend(SVG.Doc,SVG.Container),SVG.Shape=function(t){this.constructor.call(this,t)},SVG.Shape.prototype=new SVG.Element,SVG.Rect=function(){this.constructor.call(this,SVG.create("rect"))},SVG.Rect.prototype=new SVG.Shape,SVG.Circle=function(){this.constructor.call(this,SVG.create("circle"))},SVG.Circle.prototype=new SVG.Shape,SVG.extend(SVG.Circle,{move:function(e,t){return this.attrs.x=e,this.attrs.y=t,this.center()},size:function(e){return this.attr("r",e/2).center()},center:function(e,t){var n=this.attrs.r||0;return this.attr({cx:e||(this.attrs.x||0)+n,cy:t||(this.attrs.y||0)+n})}}),SVG.Ellipse=function(){this.constructor.call(this,SVG.create("ellipse"))},SVG.Ellipse.prototype=new SVG.Shape,SVG.extend(SVG.Ellipse,{move:function(e,t){return this.attrs.x=e,this.attrs.y=t,this.center()},size:function(e,t){return this.attr({rx:e/2,ry:t/2}).center()},center:function(e,t){return this.attr({cx:e||(this.attrs.x||0)+(this.attrs.rx||0),cy:t||(this.attrs.y||0)+(this.attrs.ry||0)})}}),SVG.Path=function(){this.constructor.call(this,SVG.create("path"))},SVG.Path.prototype=new SVG.Shape,SVG.extend(SVG.Path,{plot:function(e){return this.attr("d",e)}}),SVG.Image=function(){this.constructor.call(this,SVG.create("image"))},SVG.Image.prototype=new SVG.Shape,SVG.extend(SVG.Image,{load:function(e){return this.attr("xlink:href",e,SVG.xlink)}}),SVG.Text=function(){this.constructor.call(this,SVG.create("text")),this.style={"font-size":16,"font-family":"Helvetica","text-anchor":"start"},this.leading=1.2,this.lines=[]},SVG.Text.prototype=new SVG.Shape,SVG.extend(SVG.Text,{text:function(e){this.content=e=e||"text",this.lines=[];var t,r,i=this._style(),s=this.parentDoc(),o=e.split("\n");while(this.node.hasChildNodes())this.node.removeChild(this.node.lastChild);for(t=0,l=o.length;t<l;t++)r=(new n).text(o[t]).attr({dy:this.style["font-size"]*this.leading,x:this.attr("x")||0,style:i}),this.node.appendChild(r.node),this.lines.push(r);return this.attr("style",i)},_style:function(){var e,t="",n=this._s;for(e=n.length-1;e>=0;e--)this.style["font-"+n[e]]!=null&&(t+="font-"+n[e]+":"+this.style["font-"+n[e]]+";");return t+="text-anchor:"+this.style["text-anchor"]+";",t}}),n.prototype=new SVG.Shape,SVG.extend(n,{text:function(e){return this.node.appendChild(document.createTextNode(e)),this}}),SVG.extend(SVG.Shape,{fill:function(e){return e.color!=null&&this.attr("fill",e.color),e.opacity!=null&&this.attr("fill-opacity",e.opacity),this},stroke:function(e){e.color&&this.attr("stroke",e.color);var t="width opacity linecap linejoin miterlimit dasharray dashoffset".split(" ");for(var n=t.length-1;n>=0;n--)e[t[n]]!=null&&this.attr("stroke-"+t[n],e[t[n]]);return this}}),SVG.extend(SVG.Element,{rotate:function(e){var t=this.bbox();return e.x==null&&(e.x=t.cx),e.y==null&&(e.y=t.cy),this.transform("rotate("+(e.deg||0)+" "+e.x+" "+e.y+")",e.relative)}}),SVG.extend(SVG.G,{move:function(e,t){return this.transform("translate("+e+" "+t+")")}}),SVG.extend(SVG.Text,{font:function(e){var t={};for(var n in e)n=="leading"?t[n]=e[n]:n=="anchor"?t["text-anchor"]=e[n]:this._s.indexOf(n)>-1?t["font-"+n]=e[n]:void 0;return this.attr(t).text(this.content)}})}).call(this);
\ No newline at end of file
+/* svg.js v0.1-10-gffcc6f4 - svg container element group arrange defs clip gradient doc shape rect circle ellipse path image text sugar - svgjs.com/license */
+function svg(e){return new SVG.Doc(e)}(function(){function n(){this.constructor.call(this,SVG.create("tspan"))}this.SVG={ns:"http://www.w3.org/2000/svg",xlink:"http://www.w3.org/1999/xlink",create:function(e){return document.createElementNS(this.ns,e)},extend:function(e,t){for(var n in t)e.prototype[n]=t[n]}},SVG.Container={add:function(e,t){return this.has(e)||(t=t==null?this.children().length:t,this.children().splice(t,0,e),this.node.insertBefore(e.node,this.node.childNodes[t]),e.parent=this),this},has:function(e){return this.children().indexOf(e)>=0},children:function(){return this._children||(this._children=[])},remove:function(e){return this.removeAt(this.children().indexOf(e))},removeAt:function(e){if(0<=e&&e<this.children().length){var t=this.children()[e];this.children().splice(e,1),this.node.removeChild(t.node),t.parent=null}return this},defs:function(){return this._defs==null&&(this._defs=new SVG.Defs,this.add(this._defs,0)),this._defs},levelDefs:function(){var e=this.defs();return this.remove(e).add(e,0),this},group:function(){var e=new SVG.G;return this.add(e),e},rect:function(e,t){var n=(new SVG.Rect).size(e,t);return this.add(n),n},circle:function(e){var t=(new SVG.Circle).size(e);return this.add(t),t},ellipse:function(e,t){var n=(new SVG.Ellipse).size(e,t);return this.add(n),n},path:function(e){var t=(new SVG.Path).plot(e);return this.add(t),t},image:function(e){var t=(new SVG.Image).load(e);return this.add(t),t},text:function(e){var t=(new SVG.Text).text(e);return this.add(t),t},gradient:function(e,t){return this.defs().gradient(e,t)}},SVG.Element=function(t){this.node=t,this.attrs={},this._s="size family weight stretch variant style".split(" ")},SVG.extend(SVG.Element,{move:function(e,t){return this.attr({x:e,y:t})},size:function(e,t){return this.attr({width:e,height:t})},remove:function(){return this.parent!=null?this.parent.remove(this):void 0},parentDoc:function(){return this._parent(SVG.Doc)},mother:function(){return this.parentDoc()},attr:function(e,t,n){if(arguments.length<2){if(typeof e!="object")return this._isStyle(e)?e=="text"?this.content:e=="leading"?this[e]:this.style[e]:this.attrs[e];for(t in e)this.attr(t,e[t])}else{this.attrs[e]=t;if(e=="x"&&this._isText())for(var r=this.lines.length-1;r>=0;r--)this.lines[r].attr(e,t);else n!=null?this.node.setAttributeNS(n,e,t):this.node.setAttribute(e,t);this._isStyle(e)&&(e=="text"?this.text(t):e=="leading"?this[e]=t:this.style[e]=t,this.text(this.content))}return this},transform:function(e,t){var n=[],r=this.attr("transform")||"",i=r.match(/([a-z]+\([^\)]+\))/g)||[];if(t!==!0){var s=e.match(/^([A-Za-z\-]+)/)[1],t=new RegExp("^"+s);for(var o=0,r=i.length;o<r;o++)t.test(i[o])||n.push(i[o])}else n=i;return n.push(e),this.attr("transform",n.join(" "))},bbox:function(){var e=this.node.getBBox();return e.cx=e.x+e.width/2,e.cy=e.y+e.height/2,e},_parent:function(e){var t=this;while(t!=null&&!(t instanceof e))t=t.parent;return t},_isStyle:function(e){return typeof e=="string"&&this._isText()?/^font|text|leading/.test(e):!1},_isText:function(){return this instanceof SVG.Text}}),SVG.G=function(){this.constructor.call(this,SVG.create("g"))},SVG.G.prototype=new SVG.Element,SVG.extend(SVG.G,SVG.Container),SVG.extend(SVG.Element,{siblings:function(){return this.mother().children()},forward:function(){var e=this.siblings().indexOf(this);return this.mother().remove(this).add(this,e+1),this},backward:function(){var e,t=this.mother().levelDefs();return e=this.siblings().indexOf(this),e>1&&t.remove(this).add(this,e-1),this},front:function(){return this.mother().remove(this).add(this),this},back:function(){var e,t=this.mother().levelDefs();return e=this.siblings().indexOf(this),e>1&&t.remove(this).add(this,0),this}}),SVG.Defs=function(){this.constructor.call(this,SVG.create("defs"))},SVG.Defs.prototype=new SVG.Element,SVG.extend(SVG.Defs,SVG.Container);var e=0;SVG.Clip=function(){this.constructor.call(this,SVG.create("clipPath")),this.id="svgjs_clip_"+e++,this.attr("id",this.id)},SVG.Clip.prototype=new SVG.Element,SVG.extend(SVG.Clip,SVG.Container),SVG.extend(SVG.Element,{clip:function(e){var t=this.mother().defs().clip();return e(t),this.clipTo(t)},clipTo:function(e){return this.attr("clip-path","url(#"+e.id+")")}}),SVG.extend(SVG.Defs,{clip:function(){var e=new SVG.Clip;return this.add(e),e}});var t=0;SVG.Gradient=function(n){this.constructor.call(this,SVG.create(n+"Gradient")),this.id="svgjs_grad_"+t++,this.type=n,this.attr("id",this.id)},SVG.Gradient.prototype=new SVG.Element,SVG.extend(SVG.Gradient,SVG.Container),SVG.extend(SVG.Gradient,{from:function(e,t){return this.type=="radial"?this.attr({fx:e+"%",fy:t+"%"}):this.attr({x1:e+"%",y1:t+"%"})},to:function(e,t){return this.type=="radial"?this.attr({cx:e+"%",cy:t+"%"}):this.attr({x2:e+"%",y2:t+"%"})},radius:function(e){return this.type=="radial"?this.attr({r:e+"%"}):this},at:function(e){var t=new SVG.Stop(e);return this.add(t),t},update:function(e){while(this.node.hasChildNodes())this.node.removeChild(this.node.lastChild);return e(this),this},fill:function(){return"url(#"+this.id+")"}}),SVG.extend(SVG.Defs,{gradient:function(e,t){var n=new SVG.Gradient(e);return this.add(n),t(n),n}}),SVG.Stop=function(t){this.constructor.call(this,SVG.create("stop")),this.update(t)},SVG.Stop.prototype=new SVG.Element,SVG.extend(SVG.Stop,{update:function(e){var t="",n=["opacity","color"];for(var r=n.length-1;r>=0;r--)e[n[r]]!=null&&(t+="stop-"+n[r]+":"+e[n[r]]+";");return this.attr({offset:(e.offset!=null?e.offset:this.attr("offset")||0)+"%",style:t})}}),SVG.Doc=function(t){this.constructor.call(this,SVG.create("svg")),typeof t=="string"&&(t=document.getElementById(t)),this.attr({xmlns:SVG.ns,version:"1.1"}).attr("xlink",SVG.xlink,SVG.ns).size(t.offsetWidth,t.offsetHeight).defs(),t.appendChild(this.node)},SVG.Doc.prototype=new SVG.Element,SVG.extend(SVG.Doc,SVG.Container),SVG.Shape=function(t){this.constructor.call(this,t)},SVG.Shape.prototype=new SVG.Element,SVG.Rect=function(){this.constructor.call(this,SVG.create("rect"))},SVG.Rect.prototype=new SVG.Shape,SVG.Circle=function(){this.constructor.call(this,SVG.create("circle"))},SVG.Circle.prototype=new SVG.Shape,SVG.extend(SVG.Circle,{move:function(e,t){return this.attrs.x=e,this.attrs.y=t,this.center()},size:function(e){return this.attr("r",e/2).center()},center:function(e,t){var n=this.attrs.r||0;return this.attr({cx:e||(this.attrs.x||0)+n,cy:t||(this.attrs.y||0)+n})}}),SVG.Ellipse=function(){this.constructor.call(this,SVG.create("ellipse"))},SVG.Ellipse.prototype=new SVG.Shape,SVG.extend(SVG.Ellipse,{move:function(e,t){return this.attrs.x=e,this.attrs.y=t,this.center()},size:function(e,t){return this.attr({rx:e/2,ry:t/2}).center()},center:function(e,t){return this.attr({cx:e||(this.attrs.x||0)+(this.attrs.rx||0),cy:t||(this.attrs.y||0)+(this.attrs.ry||0)})}}),SVG.Path=function(){this.constructor.call(this,SVG.create("path"))},SVG.Path.prototype=new SVG.Shape,SVG.extend(SVG.Path,{plot:function(e){return this.attr("d",e)}}),SVG.Image=function(){this.constructor.call(this,SVG.create("image"))},SVG.Image.prototype=new SVG.Shape,SVG.extend(SVG.Image,{load:function(e){return this.attr("xlink:href",e,SVG.xlink)}}),SVG.Text=function(){this.constructor.call(this,SVG.create("text")),this.style={"font-size":16,"font-family":"Helvetica","text-anchor":"start"},this.leading=1.2,this.lines=[]},SVG.Text.prototype=new SVG.Shape,SVG.extend(SVG.Text,{text:function(e){this.content=e=e||"text",this.lines=[];var t,r,i=this._style(),s=this.parentDoc(),o=e.split("\n");while(this.node.hasChildNodes())this.node.removeChild(this.node.lastChild);for(t=0,l=o.length;t<l;t++)r=(new n).text(o[t]).attr({dy:this.style["font-size"]*this.leading,x:this.attr("x")||0,style:i}),this.node.appendChild(r.node),this.lines.push(r);return this.attr("style",i)},_style:function(){var e,t="",n=this._s;for(e=n.length-1;e>=0;e--)this.style["font-"+n[e]]!=null&&(t+="font-"+n[e]+":"+this.style["font-"+n[e]]+";");return t+="text-anchor:"+this.style["text-anchor"]+";",t}}),n.prototype=new SVG.Shape,SVG.extend(n,{text:function(e){return this.node.appendChild(document.createTextNode(e)),this}}),SVG.extend(SVG.Shape,{fill:function(e){return e.color!=null&&this.attr("fill",e.color),e.opacity!=null&&this.attr("fill-opacity",e.opacity),this},stroke:function(e){e.color&&this.attr("stroke",e.color);var t="width opacity linecap linejoin miterlimit dasharray dashoffset".split(" ");for(var n=t.length-1;n>=0;n--)e[t[n]]!=null&&this.attr("stroke-"+t[n],e[t[n]]);return this}}),SVG.extend(SVG.Element,{rotate:function(e){var t=this.bbox();return typeof e=="number"&&(e={deg:e}),this.transform("rotate("+(e.deg||0)+" "+(e.x==null?t.cx:e.x)+" "+(e.y==null?t.cx:e.y)+")",e.relative)}}),SVG.extend(SVG.G,{move:function(e,t){return this.transform("translate("+e+" "+t+")")}}),SVG.extend(SVG.Text,{font:function(e){var t={};for(var n in e)n=="leading"?t[n]=e[n]:n=="anchor"?t["text-anchor"]=e[n]:this._s.indexOf(n)>-1?t["font-"+n]=e[n]:void 0;return this.attr(t).text(this.content)}})}).call(this);
\ No newline at end of file
diff --git a/src/sugar.js b/src/sugar.js
index b9ac577..eba897d 100644
--- a/src/sugar.js
+++ b/src/sugar.js
@@ -36,10 +36,15 @@ SVG.extend(SVG.Element, {
   rotate: function(o) {
     var b = this.bbox();
     
-    if (o.x == null) o.x = b.cx;
-    if (o.y == null) o.y = b.cy;
-
-    return this.transform('rotate(' + (o.deg || 0) + ' ' + o.x + ' ' + o.y + ')', o.relative);
+    if (typeof o == 'number')
+      o = { deg: o };
+    
+    return this.transform(
+      'rotate(' +
+      (o.deg || 0) + ' ' +
+      (o.x == null ? b.cx : o.x) + ' ' +
+      (o.y == null ? b.cx : o.y) + ')',
+    o.relative);
   }
   
 });