Added during() method and unit morphing to fx module

7 files changed, 166 insertions, 36 deletions

diff --git a/README.md b/README.md
index 3c926eb..d9d3237 100644
--- a/README.md
+++ b/README.md
@@ -332,6 +332,7 @@ draw.each(function(i, children) {
 
 ## Animating elements
 
+### Invoking an animation
 Animating elements is very much the same as manipulating elements, the only difference is you have to include the `animate()` method:
 
 ```javascript
@@ -344,7 +345,10 @@ The `animate()` method will take two arguments. The first is `milliseconds`, the
 rect.animate(2000, '>').attr({ fill: '#f03' })
 ```
 
-By default `milliseconds` will be set to `1000`, `ease` will be set to `<>`. All available ease types are:
+By default `milliseconds` will be set to `1000`, `ease` will be set to `<>`.
+
+### Easing
+All available ease types are:
 
 - `<>`: ease in and out
 - `>`: ease out
@@ -360,6 +364,7 @@ function(pos) { return (-Math.cos(pos * Math.PI) / 2) + 0.5; }
 
 For more easing equations, have a look at the [svg.easing.js](https://github.com/wout/svg.easing.js) plugin.
 
+### Animatable methods
 Note that the `animate()` method will not return the targeted element but an instance of SVG.FX which will take the following methods:
 
 Of course `attr()`:
@@ -382,6 +387,12 @@ If you include the sugar.js module, `rotate()` and `skew()` will be available as
 rect.animate().rotate(45).skew(25, 0)
 ```
 
+You can also animate non-numeric unit values unsing the `attr()` method:
+```javascript
+rect.attr('x', '10%').animate().attr('x', '50%')
+```
+
+### Stopping animations
 Animations can be stopped in two ways.
 
 By calling the `stop()` method:
@@ -398,6 +409,39 @@ rect.animate().move(200, 200)
 rect.animate().center(200, 200)
 ```
 
+### Animating along keyframes
+If you want to perform your own actions along and during the animations you can use the `along()` method:
+
+```javascript
+var position
+  , from = 100
+  , to   = 300
+
+rect.animate(3000).move(100, 100).along(function(pos) {
+  position = from + (to - from) * pos 
+})
+```
+Note that `pos` is `0` in the beginning of the animation and `1` at the end of the animation.
+
+To make things easier for you a convenience method is passed as the second argument. This method accepts a from and to value and can be a number, unit or hex color:
+
+```javascript
+var ellipse = draw.ellipse(100, 100).attr('cx', '20%').fill('#333')
+
+rect.animate(3000).move(100, 100).during(function(pos, morph) {
+  /* numeric values */
+  circle.size(morph(100, 200), morph(100, 50))
+  
+  /* unit strings */
+  circle.attr('cx', morph('20%', '80%'))
+  
+  /* hex color strings */
+  circle.fill(morph('#333', '#ff0066'))
+})
+```
+
+
+### After animation callback
 Finally, you can add callback methods using `after()`:
 
 ```javascript
diff --git a/Rakefile b/Rakefile
index 39a66bc..1484216 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,7 +1,7 @@
-SVGJS_VERSION = '0.7'
+SVGJS_VERSION = '0.8'
 
 # all available modules in the correct loading order
-MODULES = %w[ svg viewbox bbox element container fx event group arrange defs mask pattern gradient doc shape wrap rect ellipse line poly path image text nested sugar ]
+MODULES = %w[ svg regex viewbox bbox element container fx event group arrange defs mask pattern gradient doc shape wrap rect ellipse line poly path image text nested sugar ]
 
 # how many bytes in a "kilobyte"
 KILO = 1024
diff --git a/dist/svg.js b/dist/svg.js
index 32d5a8d..2be7b45 100644
--- a/dist/svg.js
+++ b/dist/svg.js
@@ -1,4 +1,4 @@
-/* svg.js v0.7-3-gca15876 - svg viewbox bbox element container fx event group arrange defs mask pattern gradient doc shape wrap rect ellipse line poly path image text nested sugar - svgjs.com/license */
+/* svg.js v0.8 - svg regex viewbox bbox element container fx event group arrange defs mask pattern gradient doc shape wrap rect ellipse line poly path image text nested sugar - svgjs.com/license */
 (function() {
 
   this.svg = function(element) {
@@ -45,6 +45,13 @@
   
   if (!SVG.supported) return false;
 
+  SVG.regex = {
+    
+    unit: /^([\d\.]+)([a-z%]{0,2})$/
+    
+  , hex:  /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i
+  }
+
   SVG.ViewBox = function(element) {
     var x, y, width, height
       , box  = element.bbox()
@@ -303,8 +310,11 @@
       
       /* add rotation */
       if (o.rotation != 0) {
-        var box = this.bbox()
-        transform.push('rotate(' + o.rotation + ',' + (o.cx != null ? o.cx : box.cx) + ',' + (o.cy != null ? o.cy : box.cy) + ')')
+        transform.push(
+          'rotate(' + o.rotation + ','
+        + (o.cx != null ? o.cx : this.bbox().cx) + ','
+        + (o.cy != null ? o.cy : this.bbox().cy) + ')'
+        )
       }
       
       /* add scale */
@@ -564,9 +574,9 @@
       /* start animation */
       this.interval = setInterval(function(){
         // This code was borrowed from the emile.js micro framework by Thomas Fuchs, aka MadRobby.
-        var index,
-            time = (new Date).getTime(),
-            pos = time > finish ? 1 : (time - start) / duration
+        var index
+          , time = (new Date).getTime()
+          , pos = time > finish ? 1 : (time - start) / duration
         
         /* collect attribute keys */
         if (akeys == null) {
@@ -619,12 +629,18 @@
           element.transform(tvalues)
         }
         
+        /* callback for each keyframe */
+        if (fx._during)
+          fx._during.call(element, pos, function(from, to) {
+            return fx._at({ from: from, to: to }, pos)
+          })
+        
         /* finish off animation */
         if (time > finish) {
           clearInterval(fx.interval)
           fx._after ? fx._after.apply(element, [fx]) : fx.stop()
         }
-          
+        
       }, duration > 10 ? 10 : duration)
       
       return this
@@ -680,6 +696,12 @@
       
       return this
     }
+    // Add callback for each keyframe
+  , during: function(during) {
+      this._during = during
+      
+      return this
+    }
     // Callback after animation
   , after: function(after) {
       this._after = after
@@ -692,31 +714,52 @@
       clearInterval(this.interval)
       
       /* reset storage for properties that need animation */
-      this.attrs  = {}
-      this.trans  = {}
-      this._move  = null
-      this._size  = null
-      this._after = null
+      this.attrs    = {}
+      this.trans    = {}
+      this._move    = null
+      this._size    = null
+      this._after   = null
+      this._during  = null
       
       return this
     }
     // Private: at position according to from and to
   , _at: function(o, pos) {
-      /* if a number, recalculate pos */
+      /* number recalculation */
       return typeof o.from == 'number' ?
         o.from + (o.to - o.from) * pos :
       
-      /* if animating to a color */
-      o.to.r || /^#/.test(o.to) ?
+      /* unit recalculation */
+      SVG.regex.unit.test(o.to) ?
+        this._unit(o, pos) :
+      
+      /* color recalculation */
+      o.to && (o.to.r || /^#/.test(o.to)) ?
         this._color(o, pos) :
       
       /* for all other values wait until pos has reached 1 to return the final value */
       pos < 1 ? o.from : o.to
     }
+    // Private: tween unit
+  , _unit: function(o, pos) {
+      var match, from
+      
+      /* convert FROM unit */
+      match = SVG.regex.unit.exec(o.from.toString())
+      from = parseFloat(match[1])
+      
+      /* convert TO unit */
+      match = SVG.regex.unit.exec(o.to)
+      
+      return (from + (parseFloat(match[1]) - from) * pos) + match[2]
+    }
     // Private: tween color
   , _color: function(o, pos) {
       var from, to
       
+      /* normalise pos */
+      pos = pos < 0 ? 0 : pos > 1 ? 1 : pos
+      
       /* convert FROM hex to rgb */
       from = this._h2r(o.from || '#000')
       
@@ -733,7 +776,7 @@
     // Private: convert hex to rgb object
   , _h2r: function(hex) {
       /* parse full hex */
-      var match = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(this._fh(hex))
+      var match = SVG.regex.hex.exec(this._fh(hex))
       
       /* if the hex is successfully parsed, return it in rgb, otherwise return black */
       return match ? {
diff --git a/dist/svg.min.js b/dist/svg.min.js
index 4d89059..ae77e28 100644
--- a/dist/svg.min.js
+++ b/dist/svg.min.js
@@ -1,2 +1,2 @@
-/* svg.js v0.7-3-gca15876 - svg viewbox bbox element container fx event group arrange defs mask pattern gradient doc shape wrap rect ellipse line poly path image text nested sugar - svgjs.com/license */
-(function(){this.svg=function(e){if(SVG.supported)return new SVG.Doc(e)},this.SVG={ns:"http://www.w3.org/2000/svg",xlink:"http://www.w3.org/1999/xlink",did:1e3,eid:function(e){return"Svgjs"+e.charAt(0).toUpperCase()+e.slice(1)+"Element"+SVG.did++},create:function(e){var t=document.createElementNS(this.ns,e);return t.setAttribute("id",this.eid(e)),t},extend:function(e,t){for(var n in t)e.prototype[n]=t[n]}},SVG.supported=function(){return!!document.createElementNS&&!!document.createElementNS(SVG.ns,"svg").createSVGRect}();if(!SVG.supported)return!1;SVG.ViewBox=function(e){var t,n,r,i,s=e.bbox(),o=(e.attr("viewBox")||"").match(/[\d\.]+/g);this.x=s.x,this.y=s.y,this.width=e.node.offsetWidth||e.attr("width"),this.height=e.node.offsetHeight||e.attr("height"),o&&(t=parseFloat(o[0]),n=parseFloat(o[1]),r=parseFloat(o[2])-t,i=parseFloat(o[3])-n,this.zoom=this.width/this.height>r/i?this.height/i:this.width/r,this.x=t,this.y=n,this.width=r,this.height=i),this.zoom=this.zoom||1},SVG.extend(SVG.ViewBox,{toString:function(){return this.x+" "+this.y+" "+this.width+" "+this.height}}),SVG.BBox=function(e){var t=e.node.getBBox();this.x=t.x+e.trans.x,this.y=t.y+e.trans.y,this.cx=t.x+e.trans.x+t.width/2,this.cy=t.y+e.trans.y+t.height/2,this.width=t.width,this.height=t.height},SVG.Element=function(e){this.attrs={"fill-opacity":1,"stroke-opacity":1,"stroke-width":0,fill:"#000",stroke:"#000",opacity:1,x:0,y:0,cx:0,cy:0,width:0,height:0,r:0,rx:0,ry:0},this.style={},this.trans={x:0,y:0,scaleX:1,scaleY:1,rotation:0,skewX:0,skewY:0};if(this.node=e)this.type=e.nodeName,this.attrs.id=e.getAttribute("id")},SVG.extend(SVG.Element,{move:function(e,t){return this.attr({x:e,y:t})},center:function(e,t){var n=this.bbox();return this.move(e-n.width/2,t-n.height/2)},size:function(e,t){return this.attr({width:e,height:t})},clone:function(){var e;if(this instanceof SVG.Wrap)e=this.parent[this.child.node.nodeName](),e.attrs=this.attrs,e.child.trans=this.child.trans,e.child.attr(this.child.attrs).transform({}),e.plot&&e.plot(this.child.attrs[this.child instanceof SVG.Path?"d":"points"]);else{var t=this.node.nodeName;e=t=="rect"?this.parent[t](this.attrs.width,this.attrs.height):t=="ellipse"?this.parent[t](this.attrs.rx*2,this.attrs.ry*2):t=="image"?this.parent[t](this.src):t=="text"?this.parent[t](this.content):t=="g"?this.parent.group():this.parent[t](),e.attr(this.attrs)}return e.trans=this.trans,e.transform({})},remove:function(){return this.parent&&this.parent.remove(this),this},doc:function(){return this._parent(SVG.Doc)},nested:function(){return this._parent(SVG.Nested)},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 if(t===null)this.node.removeAttribute(e);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 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t,n="",r=["opacity","color"];for(t=r.length-1;t>=0;t--)e[r[t]]!=null&&(n+="stop-"+r[t]+":"+e[r[t]]+";");return this.attr({offset:(e.offset!=null?e.offset:this.attrs.offset||0)+"%",style:n})}}),SVG.Doc=function(e){this.constructor.call(this,SVG.create("svg")),this.parent=typeof e=="string"?document.getElementById(e):e,this.attr({xmlns:SVG.ns,version:"1.1",width:"100%",height:"100%"}).attr("xlink",SVG.xlink,SVG.ns).defs(),this.stage()},SVG.Doc.prototype=new SVG.Container,SVG.Doc.prototype.stage=function(){var e,t=this,n=document.createElement("div");return 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SVG.Shape,SVG.extend(SVG.Line,{move:function(e,t){var n=this.bbox();return this.attr({x1:this.attr("x1")-n.x+e,y1:this.attr("y1")-n.y+t,x2:this.attr("x2")-n.x+e,y2:this.attr("y2")-n.y+t})},center:function(e,t){var n=this.bbox();return this.move(e-n.width/2,t-n.height/2)},size:function(e,t){var n=this.bbox();return this.attr(this.attr("x1")<this.attr("x2")?"x2":"x1",n.x+e),this.attr(this.attr("y1")<this.attr("y2")?"y2":"y1",n.y+t)}}),SVG.extend(SVG.Container,{line:function(e,t,n,r){return this.put((new SVG.Line).attr({x1:e,y1:t,x2:n,y2:r}))}}),SVG.Poly={plot:function(e){return this.attr("points",e||"0,0"),this}},SVG.Polyline=function(){this.constructor.call(this,SVG.create("polyline"))},SVG.Polyline.prototype=new SVG.Shape,SVG.extend(SVG.Polyline,SVG.Poly),SVG.Polygon=function(){this.constructor.call(this,SVG.create("polygon"))},SVG.Polygon.prototype=new SVG.Shape,SVG.extend(SVG.Polygon,SVG.Poly),SVG.Path=function(){this.constructor.call(this,SVG.create("path"))},SVG.Path.prototype=new 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SVG.TSpan).text(o[t]).attr({dy:u*this.leading-(t==0?u*.3:0),x:this.attrs.x||0,style:i}),this.node.appendChild(r.node),this.lines.push(r);return this.attr("style",i)},_style:function(){var t,n="";for(t=e.length-1;t>=0;t--)this.style["font-"+e[t]]!=null&&(n+="font-"+e[t]+":"+this.style["font-"+e[t]]+";");return n+="text-anchor:"+this.style["text-anchor"]+";",n}}),SVG.TSpan=function(){this.constructor.call(this,SVG.create("tspan"))},SVG.TSpan.prototype=new SVG.Shape,SVG.extend(SVG.TSpan,{text:function(e){return this.node.appendChild(document.createTextNode(e)),this}}),SVG.Nested=function(){this.constructor.call(this,SVG.create("svg")),this.attr("style","overflow:visible")},SVG.Nested.prototype=new SVG.Container,SVG._stroke=["color","width","opacity","linecap","linejoin","miterlimit","dasharray","dashoffset"],SVG._fill=["color","opacity","rule"];var t=function(e,t){return t=="color"?e:e+"-"+t};["fill","stroke"].forEach(function(e){SVG.Shape.prototype[e]=function(n){var r;if(typeof n=="string")this.attr(e,n);else for(index=SVG["_"+e].length-1;index>=0;index--)n[SVG["_"+e][index]]!=null&&this.attr(t(e,SVG["_"+e][index]),n[SVG["_"+e][index]]);return this}}),[SVG.Element,SVG.FX].forEach(function(e){e&&SVG.extend(e,{rotate:function(e,t,n){return this.transform({rotation:e||0,cx:t,cy:n})},skew:function(e,t){return this.transform({skewX:e||0,skewY:t||0})},scale:function(e,t){return this.transform({scaleX:e,scaleY:t==null?e:t})},opacity:function(e){return this.attr("opacity",e)}})}),SVG.Text&&SVG.extend(SVG.Text,{font:function(t){var n,r={};for(n in t)n=="leading"?r[n]=t[n]:n=="anchor"?r["text-anchor"]=t[n]:e.indexOf(n)>-1?r["font-"+n]=t[n]:void 0;return this.attr(r).text(this.content)}})}).call(this);
\ No newline at end of file
+/* svg.js v0.8 - svg regex viewbox bbox element container fx event group arrange defs mask pattern gradient doc shape wrap rect ellipse line poly path image text nested sugar - svgjs.com/license */
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this},move:function(e,t){var n=this.target.bbox();return this._move={x:{from:n.x,to:e},y:{from:n.y,to:t}},this},size:function(e,t){var n=this.target.bbox();return this._size={width:{from:n.width,to:e},height:{from:n.height,to:t}},this},center:function(e,t){var n=this.target.bbox();return this._move={x:{from:n.cx,to:e-n.width/2},y:{from:n.cy,to:t-n.height/2}},this},during:function(e){return this._during=e,this},after:function(e){return this._after=e,this},stop:function(){return clearInterval(this.interval),this.attrs={},this.trans={},this._move=null,this._size=null,this._after=null,this._during=null,this},_at:function(e,t){return typeof e.from=="number"?e.from+(e.to-e.from)*t:SVG.regex.unit.test(e.to)?this._unit(e,t):e.to&&(e.to.r||/^#/.test(e.to))?this._color(e,t):t<1?e.from:e.to},_unit:function(e,t){var n,r;return n=SVG.regex.unit.exec(e.from.toString()),r=parseFloat(n[1]),n=SVG.regex.unit.exec(e.to),r+(parseFloat(n[1])-r)*t+n[2]},_color:function(e,t){var n,r;return t=t<0?0:t>1?1:t,n=this._h2r(e.from||"#000"),r=this._h2r(e.to),this._r2h({r:~~(n.r+(r.r-n.r)*t),g:~~(n.g+(r.g-n.g)*t),b:~~(n.b+(r.b-n.b)*t)})},_h2r:function(e){var t=SVG.regex.hex.exec(this._fh(e));return t?{r:parseInt(t[1],16),g:parseInt(t[2],16),b:parseInt(t[3],16)}:{r:0,g:0,b:0}},_r2h:function(e){return"#"+this._c2h(e.r)+this._c2h(e.g)+this._c2h(e.b)},_c2h:function(e){var t=e.toString(16);return t.length==1?"0"+t:t},_fh:function(e){return e.length==4?["#",e.substring(1,2),e.substring(1,2),e.substring(2,3),e.substring(2,3),e.substring(3,4),e.substring(3,4)].join(""):e}}),SVG.extend(SVG.Element,{animate:function(e,t){return(this.fx||(this.fx=new SVG.FX(this))).stop().animate(e,t)},stop:function(){return this.fx.stop(),this}}),["click","dblclick","mousedown","mouseup","mouseover","mouseout","mousemove","mouseenter","mouseleave","touchstart","touchend","touchmove","touchcancel"].forEach(function(e){SVG.Element.prototype[e]=function(t){var n=this;return this.node["on"+e]=typeof t=="function"?function(){return t.apply(n,arguments)}:null,this}}),SVG.on=function(e,t,n){e.addEventListener?e.addEventListener(t,n,!1):e.attachEvent("on"+t,n)},SVG.off=function(e,t,n){e.removeEventListener?e.removeEventListener(t,n,!1):e.detachEvent("on"+t,n)},SVG.extend(SVG.Element,{on:function(e,t){return SVG.on(this.node,e,t),this},off:function(e,t){return SVG.off(this.node,e,t),this}}),SVG.G=function(){this.constructor.call(this,SVG.create("g"))},SVG.G.prototype=new SVG.Container,SVG.extend(SVG.G,{move:function(e,t){return this.transform({x:e,y:t})},defs:function(){return this.doc().defs()}}),SVG.extend(SVG.Element,{siblings:function(){return this.parent.children()},position:function(){return this.siblings().indexOf(this)},next:function(){return this.siblings()[this.position()+1]},previous:function(){return this.siblings()[this.position()-1]},forward:function(){return this.parent.remove(this).put(this,this.position()+1)},backward:function(){var e;return this.parent.level(),e=this.position(),e>1&&this.parent.remove(this).add(this,e-1),this},front:function(){return this.parent.remove(this).put(this)},back:function(){return this.parent.level(),this.position()>1&&this.parent.remove(this).add(this,0),this}}),SVG.Defs=function(){this.constructor.call(this,SVG.create("defs"))},SVG.Defs.prototype=new SVG.Container,SVG.Mask=function(){this.constructor.call(this,SVG.create("mask"))},SVG.Mask.prototype=new SVG.Container,SVG.extend(SVG.Element,{maskWith:function(e){return this.mask=e instanceof SVG.Mask?e:this.parent.mask().add(e),this.attr("mask","url(#"+this.mask.attr("id")+")")}}),SVG.Pattern=function(e){this.constructor.call(this,SVG.create("pattern"))},SVG.Pattern.prototype=new SVG.Container,SVG.extend(SVG.Pattern,{fill:function(){return"url(#"+this.attr("id")+")"}}),SVG.extend(SVG.Defs,{pattern:function(e,t,n){var r=this.put(new SVG.Pattern);return n(r),r.attr({x:0,y:0,width:e,height:t,patternUnits:"userSpaceOnUse"})}}),SVG.Gradient=function(e){this.constructor.call(this,SVG.create(e+"Gradient")),this.type=e},SVG.Gradient.prototype=new 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){return this.put(new SVG.Stop(e))},update:function(e){while(this.node.hasChildNodes())this.node.removeChild(this.node.lastChild);return e(this),this},fill:function(){return"url(#"+this.attr("id")+")"}}),SVG.extend(SVG.Defs,{gradient:function(e,t){var n=this.put(new SVG.Gradient(e));return t(n),n}}),SVG.Stop=function(e){this.constructor.call(this,SVG.create("stop")),this.update(e)},SVG.Stop.prototype=new SVG.Element,SVG.extend(SVG.Stop,{update:function(e){var t,n="",r=["opacity","color"];for(t=r.length-1;t>=0;t--)e[r[t]]!=null&&(n+="stop-"+r[t]+":"+e[r[t]]+";");return this.attr({offset:(e.offset!=null?e.offset:this.attrs.offset||0)+"%",style:n})}}),SVG.Doc=function(e){this.constructor.call(this,SVG.create("svg")),this.parent=typeof e=="string"?document.getElementById(e):e,this.attr({xmlns:SVG.ns,version:"1.1",width:"100%",height:"100%"}).attr("xlink",SVG.xlink,SVG.ns).defs(),this.stage()},SVG.Doc.prototype=new SVG.Container,SVG.Doc.prototype.stage=function(){var e,t=this,n=document.createElement("div");return n.style.cssText="position:relative;height:100%;",t.parent.appendChild(n),n.appendChild(t.node),e=function(){document.readyState==="complete"?(t.attr("style","position:absolute;"),setTimeout(function(){t.attr("style","position:relative;"),t.parent.removeChild(t.node.parentNode),t.node.parentNode.removeChild(t.node),t.parent.appendChild(t.node)},5)):setTimeout(e,10)},e(),this},SVG.Shape=function(e){this.constructor.call(this,e)},SVG.Shape.prototype=new SVG.Element,SVG.Wrap=function(e){this.constructor.call(this,SVG.create("g")),this.node.insertBefore(e.node,null),this.child=e,this.type=e.node.nodeName},SVG.Wrap.prototype=new SVG.Shape,SVG.extend(SVG.Wrap,{move:function(e,t){return this.transform({x:e,y:t})},size:function(e,t){var n=e/this._b.width;return this.child.transform({scaleX:n,scaleY:t!=null?t/this._b.height:n}),this},center:function(e,t){return this.move(e+this._b.width*this.child.trans.scaleX/-2,t+this._b.height*this.child.trans.scaleY/-2)},attr:function(e,t,n){if(typeof e=="object")for(t in e)this.attr(t,e[t]);else{if(arguments.length<2)return e=="transform"?this.attrs[e]:this.child.attrs[e];e=="transform"?(this.attrs[e]=t,n!=null?this.node.setAttributeNS(n,e,t):this.node.setAttribute(e,t)):this.child.attr(e,t,n)}return this},plot:function(e){return this.child.plot(e),this._b=this.child.bbox(),this.child.transform({x:-this._b.x,y:-this._b.y}),this}}),SVG.Rect=function(){this.constructor.call(this,SVG.create("rect"))},SVG.Rect.prototype=new SVG.Shape,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!=null?t:e)/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.Line=function(){this.constructor.call(this,SVG.create("line"))},SVG.Line.prototype=new SVG.Shape,SVG.extend(SVG.Line,{move:function(e,t){var n=this.bbox();return this.attr({x1:this.attr("x1")-n.x+e,y1:this.attr("y1")-n.y+t,x2:this.attr("x2")-n.x+e,y2:this.attr("y2")-n.y+t})},center:function(e,t){var n=this.bbox();return this.move(e-n.width/2,t-n.height/2)},size:function(e,t){var n=this.bbox();return this.attr(this.attr("x1")<this.attr("x2")?"x2":"x1",n.x+e),this.attr(this.attr("y1")<this.attr("y2")?"y2":"y1",n.y+t)}}),SVG.extend(SVG.Container,{line:function(e,t,n,r){return this.put((new SVG.Line).attr({x1:e,y1:t,x2:n,y2:r}))}}),SVG.Poly={plot:function(e){return this.attr("points",e||"0,0"),this}},SVG.Polyline=function(){this.constructor.call(this,SVG.create("polyline"))},SVG.Polyline.prototype=new SVG.Shape,SVG.extend(SVG.Polyline,SVG.Poly),SVG.Polygon=function(){this.constructor.call(this,SVG.create("polygon"))},SVG.Polygon.prototype=new SVG.Shape,SVG.extend(SVG.Polygon,SVG.Poly),SVG.Path=function(){this.constructor.call(this,SVG.create("path"))},SVG.Path.prototype=new SVG.Shape,SVG.extend(SVG.Path,{move:function(e,t){this.transform({x:e,y:t})},plot:function(e){return this.attr("d",e||"M0,0")}}),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.src=e,e?this.attr("xlink:href",e,SVG.xlink):this}});var e=["size","family","weight","stretch","variant","style"];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},SVG.Text.prototype=new SVG.Shape,SVG.extend(SVG.Text,{text:function(e){this.content=e=e||"text",this.lines=[];var t,n,r,i=this._style(),s=this.doc(),o=e.split("\n"),u=this.style["font-size"];while(this.node.hasChildNodes())this.node.removeChild(this.node.lastChild);for(t=0,n=o.length;t<n;t++)r=(new SVG.TSpan).text(o[t]).attr({dy:u*this.leading-(t==0?u*.3:0),x:this.attrs.x||0,style:i}),this.node.appendChild(r.node),this.lines.push(r);return this.attr("style",i)},_style:function(){var t,n="";for(t=e.length-1;t>=0;t--)this.style["font-"+e[t]]!=null&&(n+="font-"+e[t]+":"+this.style["font-"+e[t]]+";");return n+="text-anchor:"+this.style["text-anchor"]+";",n}}),SVG.TSpan=function(){this.constructor.call(this,SVG.create("tspan"))},SVG.TSpan.prototype=new SVG.Shape,SVG.extend(SVG.TSpan,{text:function(e){return this.node.appendChild(document.createTextNode(e)),this}}),SVG.Nested=function(){this.constructor.call(this,SVG.create("svg")),this.attr("style","overflow:visible")},SVG.Nested.prototype=new SVG.Container,SVG._stroke=["color","width","opacity","linecap","linejoin","miterlimit","dasharray","dashoffset"],SVG._fill=["color","opacity","rule"];var t=function(e,t){return t=="color"?e:e+"-"+t};["fill","stroke"].forEach(function(e){SVG.Shape.prototype[e]=function(n){var r;if(typeof n=="string")this.attr(e,n);else for(index=SVG["_"+e].length-1;index>=0;index--)n[SVG["_"+e][index]]!=null&&this.attr(t(e,SVG["_"+e][index]),n[SVG["_"+e][index]]);return this}}),[SVG.Element,SVG.FX].forEach(function(e){e&&SVG.extend(e,{rotate:function(e,t,n){return this.transform({rotation:e||0,cx:t,cy:n})},skew:function(e,t){return this.transform({skewX:e||0,skewY:t||0})},scale:function(e,t){return this.transform({scaleX:e,scaleY:t==null?e:t})},opacity:function(e){return this.attr("opacity",e)}})}),SVG.Text&&SVG.extend(SVG.Text,{font:function(t){var n,r={};for(n in t)n=="leading"?r[n]=t[n]:n=="anchor"?r["text-anchor"]=t[n]:e.indexOf(n)>-1?r["font-"+n]=t[n]:void 0;return this.attr(r).text(this.content)}})}).call(this);
\ No newline at end of file
diff --git a/src/element.js b/src/element.js
index 05008a8..63f8c31 100644
--- a/src/element.js
+++ b/src/element.js
@@ -199,8 +199,11 @@ SVG.extend(SVG.Element, {
     
     /* add rotation */
     if (o.rotation != 0) {
-      var box = this.bbox()
-      transform.push('rotate(' + o.rotation + ',' + (o.cx != null ? o.cx : box.cx) + ',' + (o.cy != null ? o.cy : box.cy) + ')')
+      transform.push(
+        'rotate(' + o.rotation + ','
+      + (o.cx != null ? o.cx : this.bbox().cx) + ','
+      + (o.cy != null ? o.cy : this.bbox().cy) + ')'
+      )
     }
     
     /* add scale */
diff --git a/src/fx.js b/src/fx.js
index 35f95bc..cf80f38 100644
--- a/src/fx.js
+++ b/src/fx.js
@@ -20,9 +20,9 @@ SVG.extend(SVG.FX, {
     /* start animation */
     this.interval = setInterval(function(){
       // This code was borrowed from the emile.js micro framework by Thomas Fuchs, aka MadRobby.
-      var index,
-          time = (new Date).getTime(),
-          pos = time > finish ? 1 : (time - start) / duration
+      var index
+        , time = (new Date).getTime()
+        , pos = time > finish ? 1 : (time - start) / duration
       
       /* collect attribute keys */
       if (akeys == null) {
@@ -75,12 +75,18 @@ SVG.extend(SVG.FX, {
         element.transform(tvalues)
       }
       
+      /* callback for each keyframe */
+      if (fx._during)
+        fx._during.call(element, pos, function(from, to) {
+          return fx._at({ from: from, to: to }, pos)
+        })
+      
       /* finish off animation */
       if (time > finish) {
         clearInterval(fx.interval)
         fx._after ? fx._after.apply(element, [fx]) : fx.stop()
       }
-        
+      
     }, duration > 10 ? 10 : duration)
     
     return this
@@ -136,6 +142,12 @@ SVG.extend(SVG.FX, {
     
     return this
   }
+  // Add callback for each keyframe
+, during: function(during) {
+    this._during = during
+    
+    return this
+  }
   // Callback after animation
 , after: function(after) {
     this._after = after
@@ -148,31 +160,52 @@ SVG.extend(SVG.FX, {
     clearInterval(this.interval)
     
     /* reset storage for properties that need animation */
-    this.attrs  = {}
-    this.trans  = {}
-    this._move  = null
-    this._size  = null
-    this._after = null
+    this.attrs    = {}
+    this.trans    = {}
+    this._move    = null
+    this._size    = null
+    this._after   = null
+    this._during  = null
     
     return this
   }
   // Private: at position according to from and to
 , _at: function(o, pos) {
-    /* if a number, recalculate pos */
+    /* number recalculation */
     return typeof o.from == 'number' ?
       o.from + (o.to - o.from) * pos :
     
-    /* if animating to a color */
-    o.to.r || /^#/.test(o.to) ?
+    /* unit recalculation */
+    SVG.regex.unit.test(o.to) ?
+      this._unit(o, pos) :
+    
+    /* color recalculation */
+    o.to && (o.to.r || /^#/.test(o.to)) ?
       this._color(o, pos) :
     
     /* for all other values wait until pos has reached 1 to return the final value */
     pos < 1 ? o.from : o.to
   }
+  // Private: tween unit
+, _unit: function(o, pos) {
+    var match, from
+    
+    /* convert FROM unit */
+    match = SVG.regex.unit.exec(o.from.toString())
+    from = parseFloat(match[1])
+    
+    /* convert TO unit */
+    match = SVG.regex.unit.exec(o.to)
+    
+    return (from + (parseFloat(match[1]) - from) * pos) + match[2]
+  }
   // Private: tween color
 , _color: function(o, pos) {
     var from, to
     
+    /* normalise pos */
+    pos = pos < 0 ? 0 : pos > 1 ? 1 : pos
+    
     /* convert FROM hex to rgb */
     from = this._h2r(o.from || '#000')
     
@@ -189,7 +222,7 @@ SVG.extend(SVG.FX, {
   // Private: convert hex to rgb object
 , _h2r: function(hex) {
     /* parse full hex */
-    var match = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(this._fh(hex))
+    var match = SVG.regex.hex.exec(this._fh(hex))
     
     /* if the hex is successfully parsed, return it in rgb, otherwise return black */
     return match ? {
diff --git a/src/regex.js b/src/regex.js
new file mode 100644
index 0000000..7ecb557
--- /dev/null
+++ b/src/regex.js
@@ -0,0 +1,7 @@
+// Storage for regular expressions
+SVG.regex = {
+  
+  unit: /^([\d\.]+)([a-z%]{0,2})$/
+  
+, hex:  /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i
+}
\ No newline at end of file