Added transform()

18 files changed, 278 insertions, 221 deletions

diff --git a/README.md b/README.md
index 155395f..141749d 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,12 @@
-# svg.js
+# Svg.js
 
-svg.js is a small JavaScript library for manipulating SVG.
+Svg.js is a small JavaScript library for manipulating SVG.
 
 Have a look at [svgjs.com](http://svgjs.com) for a examples.
 
-svg.js is licensed under the terms of the MIT License.
+Svg.js is licensed under the terms of the MIT License.
+
+Important: this library is still in alpha, therefore the API might be subject to change in the course of development.
 
 
 ## Usage
diff --git a/Rakefile b/Rakefile
index 3e8cfe4..289849d 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,6 +1,10 @@
-SVGJS_VERSION = '0.1'
+SVGJS_VERSION = '0.1a'
 
-DEFAULT_MODULES = %w[ svg utils container element doc defs shape rect circle ellipse path image g clip ]
+CORE_MODULES = %w[ svg container element clip doc defs shape rect circle ellipse path image group ]
+
+OPTIONAL_MODULES = %w[ sugar ]
+
+DEFAULT_MODULES = CORE_MODULES + OPTIONAL_MODULES
 
 KILO = 1024   # how many bytes in a "kilobyte"
 
@@ -10,7 +14,7 @@ task :default => :dist
 class BuildTask < Rake::FileTask
   
   def modules
-    prerequisites.map {|f| File.basename(f, '.js') }
+    prerequisites.map { |f| File.basename(f, '.js') }
   end
 
   def remove_prerequisites to_remove
diff --git a/dist/svg.js b/dist/svg.js
index f0b8cc8..1d6323c 100644
--- a/dist/svg.js
+++ b/dist/svg.js
@@ -1,4 +1,4 @@
-/* svg.js 0.1 - svg utils container element doc defs shape rect circle ellipse path image g clip - svgjs.com/license */
+/* svg.js 0.1a - svg container element clip doc defs shape rect circle ellipse path image group sugar - svgjs.com/license */
 (function() {
 
   this.SVG = {
@@ -7,6 +7,11 @@
     
     create: function(e) {
       return document.createElementNS(this.ns, e);
+    },
+    
+    extend: function(o, m) {
+      for (var k in m)
+        o.prototype[k] = m[k];
     }
   };
   
@@ -14,15 +19,6 @@
     return new SVG.Doc(e);
   };
 
-  SVG.Utils = {
-    
-    merge: function(o, m) {
-      for (var k in m)
-        o.prototype[k] = m[k];
-    }
-    
-  };
-
   SVG.Container = {
     
     add: function(e) {
@@ -169,13 +165,13 @@
     
   };
 
-  SVG.Element = function Element(node) {
-    this.node = node;
+  SVG.Element = function Element(n) {
+    this.node = n;
     this.attrs = {};
   };
   
   // Add element-specific functions
-  SVG.Utils.merge(SVG.Element, {
+  SVG.extend(SVG.Element, {
     
     // move element to given x and y values
     move: function(x, y) {
@@ -184,12 +180,7 @@
   
       return this;
     },
-  
-    // set element opacity
-    opacity: function(o) {
-      return this.attr('opacity', Math.max(0, Math.min(1, o)));
-    },
-  
+    
     // set element size to given width and height
     size: function(w, h) {
       this.attr('width', w);
@@ -197,20 +188,7 @@
   
       return this;
     },
-  
-    // clip element using another element
-    clip: function(block) {
-      var p = this.parentSVG().defs().clipPath();
-      block(p);
-  
-      return this.clipTo(p);
-    },
-  
-    // distribute clipping path to svg element
-    clipTo: function(p) {
-      return this.attr('clip-path', 'url(#' + p.id + ')');
-    },
-  
+    
     // remove element
     remove: function() {
       return this.parent != null ? this.parent.remove(this) : void 0;
@@ -227,27 +205,69 @@
     },
     
     // set svg element attribute
-    attr: function(v) {
-      var a = arguments;
+    attr: function(a, v, n) {
       
-      this.attrs[a[0]] = a[1];
+      if (arguments.length < 2) {
+        if (typeof a == 'object')
+          for (v in a) this.attr(v, a[v]);
+        else
+          return this.attrs[a];
       
-      if (typeof v == 'object')
-        for (var k in v)
-          this.attr(k, v[k]);
+      } else {
+        this.attrs[a] = v;
+        n != null ?
+          this.node.setAttributeNS(n, a, v) :
+          this.node.setAttribute(a, v);
           
-      else if (a.length == 2)
-        this.node.setAttribute(a[0], a[1]);
+      }
+      
+      return this;
+    },
+    
+    // transformations
+    transform: function(t, a) {
+      var n = [],
+          s = this.attr('transform') || '',
+          l = s.match(/([a-z]+\([^\)]+\))/g) || [];
+      
+      if (a === true) {
+        var v = t.match(/^([A-Za-z\-]+)/)[1],
+            r = new RegExp('^' + v);
         
-      else if (a.length == 3)
-        this.node.setAttributeNS(a[2], a[0], a[1]);
-  
+        for (var i = 0, s = l.length; i < s; i++)
+          if (!r.test(l[i]))
+            n.push(l[i]);
+      } else
+        n = l;
+      
+      n.push(t);
+      
+      this.attr('transform', n.join(' '));
+      
       return this;
     },
   
     // get bounding box
     bbox: function() {
-      return this.node.getBBox();
+      var b = this.node.getBBox();
+      
+      b.cx = b.x + b.width / 2;
+      b.cy = b.y + b.height / 2;
+      
+      return b;
+    },
+    
+    // clip element using another element
+    clip: function(block) {
+      var p = this.parentSVG().defs().clipPath();
+      block(p);
+  
+      return this.clipTo(p);
+    },
+  
+    // distribute clipping path to svg element
+    clipTo: function(p) {
+      return this.attr('clip-path', 'url(#' + p.id + ')');
     },
   
     // private: find svg parent
@@ -263,6 +283,21 @@
   });
 
 
+  var clipID = 0;
+  
+  SVG.Clip = function Clip() {
+    this.constructor.call(this, SVG.create('clipPath'));
+    this.id = '_' + (clipID++);
+    this.attr('id', this.id);
+  };
+  
+  // inherit from SVG.Element
+  SVG.Clip.prototype = new SVG.Element();
+  
+  // include the container object
+  SVG.extend(SVG.Clip, SVG.Container);
+
+
   SVG.Doc = function Doc(e) {
     this.constructor.call(this, SVG.create('svg'));
     
@@ -280,7 +315,7 @@
   SVG.Doc.prototype = new SVG.Element();
   
   // include the container object
-  SVG.Utils.merge(SVG.Doc, SVG.Container);
+  SVG.extend(SVG.Doc, SVG.Container);
 
   SVG.Defs = function Defs() {
     this.constructor.call(this, SVG.create('defs'));
@@ -290,10 +325,10 @@
   SVG.Defs.prototype = new SVG.Element();
   
   // include the container object
-  SVG.Utils.merge(SVG.Defs, SVG.Container);
+  SVG.extend(SVG.Defs, SVG.Container);
   
   // Add def-specific functions
-  SVG.Utils.merge(SVG.Defs, {
+  SVG.extend(SVG.Defs, {
     
     // define clippath
     clipPath: function() {
@@ -311,39 +346,6 @@
   
   // inherit from SVG.Element
   SVG.Shape.prototype = new SVG.Element();
-  
-  // Add shape-specific functions
-  SVG.Utils.merge(SVG.Shape, {
-    
-    // set fill color and opacity
-    fill: function(f) {
-      if (f.color != null)
-        this.attr('fill', f.color);
-  
-      if (f.opacity != null)
-        this.attr('fill-opacity', f.opacity);
-  
-      return this;
-    },
-  
-    // set stroke color and opacity
-    stroke: function(s) {
-      if (s.color)
-        this.attr('stroke', s.color);
-  
-      if (s.width != null)
-        this.attr('stroke-width', s.width);
-  
-      if (s.opacity != null)
-        this.attr('stroke-opacity', s.opacity);
-  
-      if (this.attrs['fill-opacity'] == null)
-        this.fill({ opacity: 0 });
-  
-      return this;
-    }
-    
-  });
 
   SVG.Rect = function Rect() {
     this.constructor.call(this, SVG.create('rect'));
@@ -360,7 +362,7 @@
   SVG.Circle.prototype = new SVG.Shape();
   
   // Add circle-specific functions
-  SVG.Utils.merge(SVG.Circle, {
+  SVG.extend(SVG.Circle, {
     
     // custom move function
     move: function(x, y) {
@@ -397,7 +399,7 @@
   SVG.Ellipse.prototype = new SVG.Shape();
   
   // Add ellipse-specific functions
-  SVG.Utils.merge(SVG.Ellipse, {
+  SVG.extend(SVG.Ellipse, {
     
     // custom move function
     move: function(x, y) {
@@ -433,7 +435,7 @@
   SVG.Path.prototype = new SVG.Shape();
   
   // Add path-specific functions
-  SVG.Utils.merge(SVG.Path, {
+  SVG.extend(SVG.Path, {
     
     // set path data
     data: function(d) {
@@ -451,10 +453,10 @@
   SVG.Image.prototype = new SVG.Element();
   
   // include the container object
-  SVG.Utils.merge(SVG.Image, SVG.Container);
+  SVG.extend(SVG.Image, SVG.Container);
   
   // Add image-specific functions
-  SVG.Utils.merge(SVG.Image, {
+  SVG.extend(SVG.Image, {
     
     // (re)load image
     load: function(u) {
@@ -472,31 +474,55 @@
   SVG.G.prototype = new SVG.Element();
   
   // include the container object
-  SVG.Utils.merge(SVG.G, SVG.Container);
-  
-  // Add group-specific functions
-  SVG.Utils.merge(SVG.G, {
+  SVG.extend(SVG.G, SVG.Container);
+
+  SVG.extend(SVG.Shape, {
     
-    // group rotation
-    rotate: function(d) {
-      this.attr('transform', 'rotate(' + d + ')');
+    // set fill color and opacity
+    fill: function(f) {
+      if (f.color != null)
+        this.attr('fill', f.color);
+  
+      if (f.opacity != null)
+        this.attr('fill-opacity', f.opacity);
+  
+      return this;
+    },
+  
+    // set stroke color and opacity
+    stroke: function(s) {
+      if (s.color)
+        this.attr('stroke', s.color);
+      
+      var a = ('width opacity linecap linejoin miterlimit dasharray dashoffset').split(' ');
+      
+      for (var i = a.length - 1; i >= 0; i--)
+        if (s[a[i]] != null)
+          this.attr('stroke-' + a[i], s[a[i]]);
+      
+      //-D if (this.attrs['fill-opacity'] == null)
+      //-D   this.fill({ opacity: 0 });
+  
       return this;
     }
     
   });
-
-  var clipID = 0;
   
-  SVG.Clip = function Clip() {
-    this.constructor.call(this, SVG.create('clipPath'));
-    this.id = '_' + (clipID++);
-    this.attr('id', this.id);
-  };
+  // Add element-specific functions
+  SVG.extend(SVG.Element, {
+    
+    // rotation
+    rotate: function(o) {
+      var b = this.bbox();
+      if (o.x == null) o.x = b.cx;
+      if (o.y == null) o.y = b.cy;
   
-  // inherit from SVG.Element
-  SVG.Clip.prototype = new SVG.Element();
+      this.transform('rotate(' + (o.deg || 0) + ' ' + o.x + ' ' + o.y + ')', o.absolute);
   
-  // include the container object
-  SVG.Utils.merge(SVG.Clip, SVG.Container);
+      return this;
+    }
+    
+  });
+
 
 }).call(this);
diff --git a/dist/svg.min.js b/dist/svg.min.js
index c8f59e5..707a4f6 100644
--- a/dist/svg.min.js
+++ b/dist/svg.min.js
@@ -1,2 +1,2 @@
-/* svg.js 0.1 - svg utils container element doc defs shape rect circle ellipse path image g clip - svgjs.com/license */
-(function(){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)}},this.svg=function(e){return new SVG.Doc(e)},SVG.Utils={merge:function(e,t){for(var n in t)e.prototype[n]=t[n]}},SVG.Container={add:function(e){return this.addAt(e)},addAt:function(e,t){return this.contains(e)||(t=t==null?this.children().length:t,this.children().splice(t,0,e),this.node.insertBefore(e.node,this.node.childNodes[t+1]),e.parent=this),this},contains:function(e){return Array.prototype.indexOf.call(this.children(),e)>=0},children:function(){return this._children||[]},sendBack:function(e){var t=this.children().indexOf(e);if(t!==-1)return this.remove(e).addAt(e,t-1)},bringForward:function(e){var t=this.children().indexOf(e);if(t!==-1)return this.remove(e).addAt(e,t+1)},bringToFront:function(e){return this.contains(e)&&this.remove(e).add(e),this},sendToBottom:function(e){return this.contains(e)&&this.remove(e).addAt(e,0),this},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)),this._defs},group:function(){var e=new SVG.G;return this.add(e),e},rect:function(e){return this.place(new SVG.Rect,e)},circle:function(e){var t;return e!=null&&(t={x:e.x,y:e.y},e.r||e.radius?t.width=t.height=(e.r||e.radius)*2:t.width=t.height=e.width||e.height),this.place(new SVG.Circle,t)},ellipse:function(e){var t;return e!=null&&(t={x:e.x,y:e.y},e.width&&(t.width=e.width),e.height&&(t.height=e.height),e.rx&&(t.width=e.rx*2),e.ry&&(t.height=e.ry*2)),this.place(new SVG.Ellipse,t)},path:function(e){return this.place(new SVG.Path,e)},image:function(e){return this.place(new SVG.Image,e)},place:function(e,t){return t!=null&&(t.x!=null&&t.y!=null&&e.move(t.x,t.y),t.width!=null&&t.height!=null&&e.size(t.width,t.height),t.data!=null&&e.data(t.data),t.src!=null&&e.load(t.src)),this.add(e),e}},SVG.Element=function(t){this.node=t,this.attrs={}},SVG.Utils.merge(SVG.Element,{move:function(e,t){return this.attr("x",e),this.attr("y",t),this},opacity:function(e){return this.attr("opacity",Math.max(0,Math.min(1,e)))},size:function(e,t){return this.attr("width",e),this.attr("height",t),this},clip:function(e){var t=this.parentSVG().defs().clipPath();return e(t),this.clipTo(t)},clipTo:function(e){return this.attr("clip-path","url(#"+e.id+")")},remove:function(){return this.parent!=null?this.parent.remove(this):void 0},parentDoc:function(){return this._parent(SVG.Doc)},parentSVG:function(){return this.parentDoc()},attr:function(e){var t=arguments;this.attrs[t[0]]=t[1];if(typeof e=="object")for(var n in e)this.attr(n,e[n]);else t.length==2?this.node.setAttribute(t[0],t[1]):t.length==3&&this.node.setAttributeNS(t[2],t[0],t[1]);return this},bbox:function(){return this.node.getBBox()},_parent:function(e){var t=this;while(t!=null&&!(t instanceof e))t=t.parent;return t}}),SVG.Doc=function(t){this.constructor.call(this,SVG.create("svg")),this.attr("xmlns",SVG.ns),this.attr("version","1.1"),this.attr("xlink",SVG.xlink,SVG.ns),typeof t=="string"&&(t=document.getElementById(t)),t.appendChild(this.node)},SVG.Doc.prototype=new SVG.Element,SVG.Utils.merge(SVG.Doc,SVG.Container),SVG.Defs=function(){this.constructor.call(this,SVG.create("defs"))},SVG.Defs.prototype=new SVG.Element,SVG.Utils.merge(SVG.Defs,SVG.Container),SVG.Utils.merge(SVG.Defs,{clipPath:function(){var e=new SVG.Clip;return this.add(e),e}}),SVG.Shape=function(t){this.constructor.call(this,t)},SVG.Shape.prototype=new SVG.Element,SVG.Utils.merge(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){return e.color&&this.attr("stroke",e.color),e.width!=null&&this.attr("stroke-width",e.width),e.opacity!=null&&this.attr("stroke-opacity",e.opacity),this.attrs["fill-opacity"]==null&&this.fill({opacity:0}),this}}),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.Utils.merge(SVG.Circle,{move:function(e,t){return this.attrs.x=e,this.attrs.y=t,this.center(),this},size:function(e,t){return this.attr("r",e/2),this.center(),this},center:function(e,t){var n=this.attrs.r||0;this.attr("cx",e||(this.attrs.x||0)+n),this.attr("cy",t||(this.attrs.y||0)+n)}}),SVG.Ellipse=function(){this.constructor.call(this,SVG.create("ellipse"))},SVG.Ellipse.prototype=new SVG.Shape,SVG.Utils.merge(SVG.Ellipse,{move:function(e,t){return this.attrs.x=e,this.attrs.y=t,this.center(),this},size:function(e,t){return this.attr("rx",e/2),this.attr("ry",t/2),this.center(),this},center:function(e,t){this.attr("cx",e||(this.attrs.x||0)+(this.attrs.rx||0)),this.attr("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.Utils.merge(SVG.Path,{data:function(e){return this.attr("d",e),this}}),SVG.Image=function(){this.constructor.call(this,SVG.create("image"))},SVG.Image.prototype=new SVG.Element,SVG.Utils.merge(SVG.Image,SVG.Container),SVG.Utils.merge(SVG.Image,{load:function(e){return this.attr("href",e,SVG.xlink),this}}),SVG.G=function(){this.constructor.call(this,SVG.create("g"))},SVG.G.prototype=new SVG.Element,SVG.Utils.merge(SVG.G,SVG.Container),SVG.Utils.merge(SVG.G,{rotate:function(e){return this.attr("transform","rotate("+e+")"),this}});var e=0;SVG.Clip=function(){this.constructor.call(this,SVG.create("clipPath")),this.id="_"+e++,this.attr("id",this.id)},SVG.Clip.prototype=new SVG.Element,SVG.Utils.merge(SVG.Clip,SVG.Container)}).call(this);
\ No newline at end of file
+/* svg.js 0.1a - svg container element clip doc defs shape rect circle ellipse path image group sugar - svgjs.com/license */
+(function(){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]}},this.svg=function(e){return new SVG.Doc(e)},SVG.Container={add:function(e){return this.addAt(e)},addAt:function(e,t){return this.contains(e)||(t=t==null?this.children().length:t,this.children().splice(t,0,e),this.node.insertBefore(e.node,this.node.childNodes[t+1]),e.parent=this),this},contains:function(e){return Array.prototype.indexOf.call(this.children(),e)>=0},children:function(){return this._children||[]},sendBack:function(e){var t=this.children().indexOf(e);if(t!==-1)return this.remove(e).addAt(e,t-1)},bringForward:function(e){var t=this.children().indexOf(e);if(t!==-1)return this.remove(e).addAt(e,t+1)},bringToFront:function(e){return this.contains(e)&&this.remove(e).add(e),this},sendToBottom:function(e){return this.contains(e)&&this.remove(e).addAt(e,0),this},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)),this._defs},group:function(){var e=new SVG.G;return this.add(e),e},rect:function(e){return this.place(new SVG.Rect,e)},circle:function(e){var t;return e!=null&&(t={x:e.x,y:e.y},e.r||e.radius?t.width=t.height=(e.r||e.radius)*2:t.width=t.height=e.width||e.height),this.place(new SVG.Circle,t)},ellipse:function(e){var t;return e!=null&&(t={x:e.x,y:e.y},e.width&&(t.width=e.width),e.height&&(t.height=e.height),e.rx&&(t.width=e.rx*2),e.ry&&(t.height=e.ry*2)),this.place(new SVG.Ellipse,t)},path:function(e){return this.place(new SVG.Path,e)},image:function(e){return this.place(new SVG.Image,e)},place:function(e,t){return t!=null&&(t.x!=null&&t.y!=null&&e.move(t.x,t.y),t.width!=null&&t.height!=null&&e.size(t.width,t.height),t.data!=null&&e.data(t.data),t.src!=null&&e.load(t.src)),this.add(e),e}},SVG.Element=function(t){this.node=t,this.attrs={}},SVG.extend(SVG.Element,{move:function(e,t){return this.attr("x",e),this.attr("y",t),this},size:function(e,t){return this.attr("width",e),this.attr("height",t),this},remove:function(){return this.parent!=null?this.parent.remove(this):void 0},parentDoc:function(){return this._parent(SVG.Doc)},parentSVG:function(){return this.parentDoc()},attr:function(e,t,n){if(arguments.length<2){if(typeof e!="object")return this.attrs[e];for(t in e)this.attr(t,e[t])}else this.attrs[e]=t,n!=null?this.node.setAttributeNS(n,e,t):this.node.setAttribute(e,t);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],o=new RegExp("^"+s);for(var u=0,r=i.length;u<r;u++)o.test(i[u])||n.push(i[u])}else n=i;return n.push(e),this.attr("transform",n.join(" ")),this},bbox:function(){var e=this.node.getBBox();return e.cx=e.x+e.width/2,e.cy=e.y+e.height/2,e},clip:function(e){var t=this.parentSVG().defs().clipPath();return e(t),this.clipTo(t)},clipTo:function(e){return this.attr("clip-path","url(#"+e.id+")")},_parent:function(e){var t=this;while(t!=null&&!(t instanceof e))t=t.parent;return t}});var e=0;SVG.Clip=function(){this.constructor.call(this,SVG.create("clipPath")),this.id="_"+e++,this.attr("id",this.id)},SVG.Clip.prototype=new SVG.Element,SVG.extend(SVG.Clip,SVG.Container),SVG.Doc=function(t){this.constructor.call(this,SVG.create("svg")),this.attr("xmlns",SVG.ns),this.attr("version","1.1"),this.attr("xlink",SVG.xlink,SVG.ns),typeof t=="string"&&(t=document.getElementById(t)),t.appendChild(this.node)},SVG.Doc.prototype=new SVG.Element,SVG.extend(SVG.Doc,SVG.Container),SVG.Defs=function(){this.constructor.call(this,SVG.create("defs"))},SVG.Defs.prototype=new SVG.Element,SVG.extend(SVG.Defs,SVG.Container),SVG.extend(SVG.Defs,{clipPath:function(){var e=new SVG.Clip;return this.add(e),e}}),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(),this},size:function(e,t){return this.attr("r",e/2),this.center(),this},center:function(e,t){var n=this.attrs.r||0;this.attr("cx",e||(this.attrs.x||0)+n),this.attr("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(),this},size:function(e,t){return this.attr("rx",e/2),this.attr("ry",t/2),this.center(),this},center:function(e,t){this.attr("cx",e||(this.attrs.x||0)+(this.attrs.rx||0)),this.attr("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,{data:function(e){return this.attr("d",e),this}}),SVG.Image=function(){this.constructor.call(this,SVG.create("image"))},SVG.Image.prototype=new SVG.Element,SVG.extend(SVG.Image,SVG.Container),SVG.extend(SVG.Image,{load:function(e){return this.attr("href",e,SVG.xlink),this}}),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.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.absolute),this}})}).call(this);
\ No newline at end of file
diff --git a/src/circle.js b/src/circle.js
index 890d1d3..9576568 100644
--- a/src/circle.js
+++ b/src/circle.js
@@ -7,7 +7,7 @@ SVG.Circle = function Circle() {
 SVG.Circle.prototype = new SVG.Shape();
 
 // Add circle-specific functions
-SVG.Utils.merge(SVG.Circle, {
+SVG.extend(SVG.Circle, {
   
   // custom move function
   move: function(x, y) {
diff --git a/src/clip.js b/src/clip.js
index 80d78d0..189b62c 100644
--- a/src/clip.js
+++ b/src/clip.js
@@ -1,3 +1,4 @@
+
 // initialize id sequence
 var clipID = 0;
 
@@ -11,4 +12,4 @@ SVG.Clip = function Clip() {
 SVG.Clip.prototype = new SVG.Element();
 
 // include the container object
-SVG.Utils.merge(SVG.Clip, SVG.Container);
\ No newline at end of file
+SVG.extend(SVG.Clip, SVG.Container);
diff --git a/src/defs.js b/src/defs.js
index 4ba7c8c..f5753e1 100644
--- a/src/defs.js
+++ b/src/defs.js
@@ -7,10 +7,10 @@ SVG.Defs = function Defs() {
 SVG.Defs.prototype = new SVG.Element();
 
 // include the container object
-SVG.Utils.merge(SVG.Defs, SVG.Container);
+SVG.extend(SVG.Defs, SVG.Container);
 
 // Add def-specific functions
-SVG.Utils.merge(SVG.Defs, {
+SVG.extend(SVG.Defs, {
   
   // define clippath
   clipPath: function() {
diff --git a/src/doc.js b/src/doc.js
index 41b157f..e361e29 100644
--- a/src/doc.js
+++ b/src/doc.js
@@ -16,4 +16,4 @@ SVG.Doc = function Doc(e) {
 SVG.Doc.prototype = new SVG.Element();
 
 // include the container object
-SVG.Utils.merge(SVG.Doc, SVG.Container);
\ No newline at end of file
+SVG.extend(SVG.Doc, SVG.Container);
\ No newline at end of file
diff --git a/src/element.js b/src/element.js
index 9536a79..39bca21 100644
--- a/src/element.js
+++ b/src/element.js
@@ -1,11 +1,11 @@
 
-SVG.Element = function Element(node) {
-  this.node = node;
+SVG.Element = function Element(n) {
+  this.node = n;
   this.attrs = {};
 };
 
 // Add element-specific functions
-SVG.Utils.merge(SVG.Element, {
+SVG.extend(SVG.Element, {
   
   // move element to given x and y values
   move: function(x, y) {
@@ -14,12 +14,7 @@ SVG.Utils.merge(SVG.Element, {
 
     return this;
   },
-
-  // set element opacity
-  opacity: function(o) {
-    return this.attr('opacity', Math.max(0, Math.min(1, o)));
-  },
-
+  
   // set element size to given width and height
   size: function(w, h) {
     this.attr('width', w);
@@ -27,20 +22,7 @@ SVG.Utils.merge(SVG.Element, {
 
     return this;
   },
-
-  // clip element using another element
-  clip: function(block) {
-    var p = this.parentSVG().defs().clipPath();
-    block(p);
-
-    return this.clipTo(p);
-  },
-
-  // distribute clipping path to svg element
-  clipTo: function(p) {
-    return this.attr('clip-path', 'url(#' + p.id + ')');
-  },
-
+  
   // remove element
   remove: function() {
     return this.parent != null ? this.parent.remove(this) : void 0;
@@ -57,27 +39,69 @@ SVG.Utils.merge(SVG.Element, {
   },
   
   // set svg element attribute
-  attr: function(v) {
-    var a = arguments;
+  attr: function(a, v, n) {
     
-    this.attrs[a[0]] = a[1];
+    if (arguments.length < 2) {
+      if (typeof a == 'object')
+        for (v in a) this.attr(v, a[v]);
+      else
+        return this.attrs[a];
     
-    if (typeof v == 'object')
-      for (var k in v)
-        this.attr(k, v[k]);
+    } else {
+      this.attrs[a] = v;
+      n != null ?
+        this.node.setAttributeNS(n, a, v) :
+        this.node.setAttribute(a, v);
         
-    else if (a.length == 2)
-      this.node.setAttribute(a[0], a[1]);
+    }
+    
+    return this;
+  },
+  
+  // transformations
+  transform: function(t, a) {
+    var n = [],
+        s = this.attr('transform') || '',
+        l = s.match(/([a-z]+\([^\)]+\))/g) || [];
+    
+    if (a === true) {
+      var v = t.match(/^([A-Za-z\-]+)/)[1],
+          r = new RegExp('^' + v);
       
-    else if (a.length == 3)
-      this.node.setAttributeNS(a[2], a[0], a[1]);
-
+      for (var i = 0, s = l.length; i < s; i++)
+        if (!r.test(l[i]))
+          n.push(l[i]);
+    } else
+      n = l;
+    
+    n.push(t);
+    
+    this.attr('transform', n.join(' '));
+    
     return this;
   },
 
   // get bounding box
   bbox: function() {
-    return this.node.getBBox();
+    var b = this.node.getBBox();
+    
+    b.cx = b.x + b.width / 2;
+    b.cy = b.y + b.height / 2;
+    
+    return b;
+  },
+  
+  // clip element using another element
+  clip: function(block) {
+    var p = this.parentSVG().defs().clipPath();
+    block(p);
+
+    return this.clipTo(p);
+  },
+
+  // distribute clipping path to svg element
+  clipTo: function(p) {
+    return this.attr('clip-path', 'url(#' + p.id + ')');
   },
 
   // private: find svg parent
diff --git a/src/ellipse.js b/src/ellipse.js
index 1cfd0c1..f1638ee 100644
--- a/src/ellipse.js
+++ b/src/ellipse.js
@@ -7,7 +7,7 @@ SVG.Ellipse = function Ellipse() {
 SVG.Ellipse.prototype = new SVG.Shape();
 
 // Add ellipse-specific functions
-SVG.Utils.merge(SVG.Ellipse, {
+SVG.extend(SVG.Ellipse, {
   
   // custom move function
   move: function(x, y) {
diff --git a/src/g.js b/src/g.js
deleted file mode 100644
index cd6de15..0000000
--- a/src/g.js
+++ /dev/null
@@ -1,21 +0,0 @@
-
-SVG.G = function G() {
-  this.constructor.call(this, SVG.create('g'));
-};
-
-// inherit from SVG.Element
-SVG.G.prototype = new SVG.Element();
-
-// include the container object
-SVG.Utils.merge(SVG.G, SVG.Container);
-
-// Add group-specific functions
-SVG.Utils.merge(SVG.G, {
-  
-  // group rotation
-  rotate: function(d) {
-    this.attr('transform', 'rotate(' + d + ')');
-    return this;
-  }
-  
-});
\ No newline at end of file
diff --git a/src/group.js b/src/group.js
new file mode 100644
index 0000000..e3cb6a8
--- /dev/null
+++ b/src/group.js
@@ -0,0 +1,10 @@
+
+SVG.G = function G() {
+  this.constructor.call(this, SVG.create('g'));
+};
+
+// inherit from SVG.Element
+SVG.G.prototype = new SVG.Element();
+
+// include the container object
+SVG.extend(SVG.G, SVG.Container);
\ No newline at end of file
diff --git a/src/image.js b/src/image.js
index bc1dc60..107fef4 100644
--- a/src/image.js
+++ b/src/image.js
@@ -7,10 +7,10 @@ SVG.Image = function Image() {
 SVG.Image.prototype = new SVG.Element();
 
 // include the container object
-SVG.Utils.merge(SVG.Image, SVG.Container);
+SVG.extend(SVG.Image, SVG.Container);
 
 // Add image-specific functions
-SVG.Utils.merge(SVG.Image, {
+SVG.extend(SVG.Image, {
   
   // (re)load image
   load: function(u) {
diff --git a/src/path.js b/src/path.js
index ee4484f..60ec9ef 100644
--- a/src/path.js
+++ b/src/path.js
@@ -7,7 +7,7 @@ SVG.Path = function Path() {
 SVG.Path.prototype = new SVG.Shape();
 
 // Add path-specific functions
-SVG.Utils.merge(SVG.Path, {
+SVG.extend(SVG.Path, {
   
   // set path data
   data: function(d) {
diff --git a/src/shape.js b/src/shape.js
index 1a32a00..236a066 100644
--- a/src/shape.js
+++ b/src/shape.js
@@ -4,37 +4,4 @@ SVG.Shape = function Shape(element) {
 };
 
 // inherit from SVG.Element
-SVG.Shape.prototype = new SVG.Element();
-
-// Add shape-specific functions
-SVG.Utils.merge(SVG.Shape, {
-  
-  // set fill color and opacity
-  fill: function(f) {
-    if (f.color != null)
-      this.attr('fill', f.color);
-
-    if (f.opacity != null)
-      this.attr('fill-opacity', f.opacity);
-
-    return this;
-  },
-
-  // set stroke color and opacity
-  stroke: function(s) {
-    if (s.color)
-      this.attr('stroke', s.color);
-
-    if (s.width != null)
-      this.attr('stroke-width', s.width);
-
-    if (s.opacity != null)
-      this.attr('stroke-opacity', s.opacity);
-
-    if (this.attrs['fill-opacity'] == null)
-      this.fill({ opacity: 0 });
-
-    return this;
-  }
-  
-});
\ No newline at end of file
+SVG.Shape.prototype = new SVG.Element();
\ No newline at end of file
diff --git a/src/sugar.js b/src/sugar.js
new file mode 100644
index 0000000..9b5b482
--- /dev/null
+++ b/src/sugar.js
@@ -0,0 +1,49 @@
+
+// Add shape-specific functions
+SVG.extend(SVG.Shape, {
+  
+  // set fill color and opacity
+  fill: function(f) {
+    if (f.color != null)
+      this.attr('fill', f.color);
+
+    if (f.opacity != null)
+      this.attr('fill-opacity', f.opacity);
+
+    return this;
+  },
+
+  // set stroke color and opacity
+  stroke: function(s) {
+    if (s.color)
+      this.attr('stroke', s.color);
+    
+    var a = ('width opacity linecap linejoin miterlimit dasharray dashoffset').split(' ');
+    
+    for (var i = a.length - 1; i >= 0; i--)
+      if (s[a[i]] != null)
+        this.attr('stroke-' + a[i], s[a[i]]);
+    
+    //-D if (this.attrs['fill-opacity'] == null)
+    //-D   this.fill({ opacity: 0 });
+
+    return this;
+  }
+  
+});
+
+// Add element-specific functions
+SVG.extend(SVG.Element, {
+  
+  // rotation
+  rotate: function(o) {
+    var b = this.bbox();
+    if (o.x == null) o.x = b.cx;
+    if (o.y == null) o.y = b.cy;
+
+    this.transform('rotate(' + (o.deg || 0) + ' ' + o.x + ' ' + o.y + ')', o.absolute);
+
+    return this;
+  }
+  
+});
diff --git a/src/svg.js b/src/svg.js
index 331d756..f33f9e7 100644
--- a/src/svg.js
+++ b/src/svg.js
@@ -5,6 +5,11 @@ this.SVG = {
   
   create: function(e) {
     return document.createElementNS(this.ns, e);
+  },
+  
+  extend: function(o, m) {
+    for (var k in m)
+      o.prototype[k] = m[k];
   }
 };
 
diff --git a/src/utils.js b/src/utils.js
deleted file mode 100644
index 5cf1bda..0000000
--- a/src/utils.js
+++ /dev/null
@@ -1,10 +0,0 @@
-
-
-SVG.Utils = {
-  
-  merge: function(o, m) {
-    for (var k in m)
-      o.prototype[k] = m[k];
-  }
-  
-};
\ No newline at end of file