Updated readme

5 files changed, 55 insertions, 43 deletions

diff --git a/README.md b/README.md
index 0558792..9b2a528 100644
--- a/README.md
+++ b/README.md
@@ -214,6 +214,50 @@ group.add(rect);
 _This functionality requires the group.js module which is included in the default distribution._
 
 
+## Extending functionality
+Svg.js has a modular structure. It is very easy to add you own methods at different levels. Let's say we want to add a method to all shape types then we would add our method to SVG.Shape:
+```javascript
+SVG.extend(SVG.Shape, {
+  
+  paintRed: function() {
+    return this.fill({ color: 'red' });
+  }
+  
+});
+```
+Now all shapes will have the paintRed method available. Say we want to have the paintRed method on a circle apply a slightly different color:
+```javascript
+SVG.extend(SVG.Circle, {
+  
+  paintRed: function() {
+    return this.fill({ color: 'orangered' });
+  }
+  
+});
+```
+The complete inheritance stack for 'SVG.Circle' is:
+
+_SVG.Circle < SVG.Shape < SVG.Element_
+
+The SVG document can be extended by using:
+
+```javascript
+SVG.extend(SVG.Doc, {
+  
+  paintAllPink: function() {
+    var children = this.children();
+    
+    for (var i = 0, l = children.length; i < l; i++) {
+      this.fill({ color: 'pink' });
+    };
+    
+    return this;
+  }
+  
+});
+```
+
+
 ## Compatibility
 
 ### Desktop
diff --git a/dist/svg.js b/dist/svg.js
index 62dc9d5..e1ae95d 100644
--- a/dist/svg.js
+++ b/dist/svg.js
@@ -153,22 +153,12 @@
     
     // move element to given x and y values
     move: function(x, y) {
-      this.attr({
-        x: x,
-        y: y
-      });
-  
-      return this;
+      return this.attr({ x: x, y: y });
     },
     
     // set element size to given width and height
     size: function(w, h) {
-      this.attr({
-        width: w,
-        height: h
-      });
-  
-      return this;
+      return this.attr({ width: w, height: h });
     },
     
     // remove element
@@ -225,9 +215,7 @@
       
       n.push(t);
       
-      this.attr('transform', n.join(' '));
-      
-      return this;
+      return this.attr('transform', n.join(' '));
     },
   
     // get bounding box
@@ -561,9 +549,7 @@
       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;
+      return this.transform('rotate(' + (o.deg || 0) + ' ' + o.x + ' ' + o.y + ')', o.absolute);
     }
     
   });
@@ -573,9 +559,7 @@
     
     // move using translate
     move: function(x, y) {
-      this.transform('translate(' + x + ' ' + y + ')', true);
-  
-      return this;
+      return this.transform('translate(' + x + ' ' + y + ')', true);
     }
     
   });
diff --git a/dist/svg.min.js b/dist/svg.min.js
index 937bc37..190681d 100644
--- a/dist/svg.min.js
+++ b/dist/svg.min.js
@@ -1,2 +1,2 @@
 /* svg.js 0.1a - svg container element group arrange clip doc defs shape rect circle ellipse path image 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,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){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,y:t}),this},size:function(e,t){return this.attr({width:e,height:t}),this},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.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},_parent:function(e){var t=this;while(t!=null&&!(t instanceof e))t=t.parent;return t}}),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();return t.levelDefs(),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();return t.levelDefs(),e=this.siblings().indexOf(this),e>1&&t.remove(this).add(this,0),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.extend(SVG.Clip,SVG.Container),SVG.extend(SVG.Element,{clip:function(e){var t=this.mother().defs().clipPath();return e(t),this.clipTo(t)},clipTo:function(e){return this.attr("clip-path","url(#"+e.id+")")}}),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),this.defs(),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){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.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}}),SVG.extend(SVG.G,{move:function(e,t){return this.transform("translate("+e+" "+t+")",!0),this}})}).call(this);
\ No newline at end of file
+(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,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){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,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.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(" "))},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}}),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();return t.levelDefs(),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();return t.levelDefs(),e=this.siblings().indexOf(this),e>1&&t.remove(this).add(this,0),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.extend(SVG.Clip,SVG.Container),SVG.extend(SVG.Element,{clip:function(e){var t=this.mother().defs().clipPath();return e(t),this.clipTo(t)},clipTo:function(e){return this.attr("clip-path","url(#"+e.id+")")}}),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),this.defs(),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){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.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)}}),SVG.extend(SVG.G,{move:function(e,t){return this.transform("translate("+e+" "+t+")",!0)}})}).call(this);
\ No newline at end of file
diff --git a/src/element.js b/src/element.js
index 396d67e..35464ad 100644
--- a/src/element.js
+++ b/src/element.js
@@ -9,22 +9,12 @@ SVG.extend(SVG.Element, {
   
   // move element to given x and y values
   move: function(x, y) {
-    this.attr({
-      x: x,
-      y: y
-    });
-
-    return this;
+    return this.attr({ x: x, y: y });
   },
   
   // set element size to given width and height
   size: function(w, h) {
-    this.attr({
-      width: w,
-      height: h
-    });
-
-    return this;
+    return this.attr({ width: w, height: h });
   },
   
   // remove element
@@ -81,9 +71,7 @@ SVG.extend(SVG.Element, {
     
     n.push(t);
     
-    this.attr('transform', n.join(' '));
-    
-    return this;
+    return this.attr('transform', n.join(' '));
   },
 
   // get bounding box
diff --git a/src/sugar.js b/src/sugar.js
index a9e1458..dda1aa3 100644
--- a/src/sugar.js
+++ b/src/sugar.js
@@ -42,9 +42,7 @@ SVG.extend(SVG.Element, {
     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;
+    return this.transform('rotate(' + (o.deg || 0) + ' ' + o.x + ' ' + o.y + ')', o.absolute);
   }
   
 });
@@ -54,9 +52,7 @@ SVG.extend(SVG.G, {
   
   // move using translate
   move: function(x, y) {
-    this.transform('translate(' + x + ' ' + y + ')', true);
-
-    return this;
+    return this.transform('translate(' + x + ' ' + y + ')', true);
   }
   
 });