Added marker, symbol and dynamic referencing

31 files changed, 657 insertions, 95 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7575f12..cfb2d61 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,25 @@
+# 1.0.0-rc.10 (27/06/2014)
+
+- remove internal references everywhere -> __TODO!__
+- rework transformation to be chainable and more true to native SVG -> __TODO!__
+- implement an SVG adoption system to be able to manipulate existing SVG's not created with svg.js -> __TODO!__
+- fixed a bug in clipping and masking where empty nodes persists after removal -> __TODO!__
+- fixed infinite loop in viewbox when element has a percentage width / height [thanks @shabegger] -> __TO MERGE!__
+
+# 1.0.0-rc.9 (17/06/2014)
+
+- added `SVG.Marker`
+- added `SVG.Symbol`
+- added `first()` and `last()` methods to `SVG.Set`
+- added `length()` method to `SVG.Text` and `SVG.TSpan` to calculate total text length
+- `SVG.get()` will now also fetch elements with a `xlink:href="#elementId"` or `url(#elementId)` value given
+- added `reference()` method to get referenced elements from a given attribute value
+
 # 1.0.0-rc.8 (12/06/2014)
 
 - fixed bug in `SVG.off`
 - fixed offset by window scroll position in `rbox()` [thanks @bryhoyt]
 
-
 # 1.0.0-rc.7 (11/06/2014)
 
 - calling `after()` when calling `stop(true)` (fulfill flag) [thanks @vird]
diff --git a/README.md b/README.md
index 63baa68..0105133 100755
--- a/README.md
+++ b/README.md
@@ -339,7 +339,7 @@ __`returns`: `itself`__
 The path string is similar to the polygon string but much more complex in order to support curves:
 
 ```javascript
-var path = draw.path('M10,20L30,40')
+draw.path('M 100 200 C 200 100 300  0 400 100 C 500 200 600 300 700 200 C 800 100 900 100 900 100')
 ```
 
 __`returns`: `SVG.Path`__
@@ -539,6 +539,16 @@ text.clear()
 
 __`returns`: `itself`__
 
+### length()
+Gets the total computed text length of all tspans together:
+
+```javascript
+text.length()
+```
+
+__`returns`: `number`__
+
+
 ### lines
 All added tspans are stored in the `lines` reference, which is an instance of `SVG.Set`.
 
@@ -641,6 +651,15 @@ tspan.clear()
 
 __`returns`: `itself`__
 
+### length()
+Gets the total computed text length:
+
+```javascript
+tspan.length()
+```
+
+__`returns`: `number`__
+
 ## TextPath
 A nice feature in svg is the ability to run text along a path:
 
@@ -891,6 +910,20 @@ draw.clear()
 __`returns`: `itself`__
 
 
+## Attribute references
+
+### reference()
+In cases where an element is linked to another element through an attribute, the linked element instance can be fetched with the `reference()` method. The only thing required is the attribute name:
+
+```javascript
+use.reference('href') //-> returns used element instance
+// or
+rect.reference('fill') //-> returns gradient instance
+// or
+circle.reference('clip-path') //-> returns clip instance
+```
+
+
 ## Manipulating elements
 
 ### attr()
@@ -2072,7 +2105,7 @@ set.index(rect) //-> -1 if element is not a member
 __`returns`: `number`__
 
 ### get()
-Get the element at a given index:
+Gets the element at a given index:
 
 ```javascript
 set.get(1)
@@ -2080,6 +2113,24 @@ set.get(1)
 
 __`returns`: `element`__
 
+### first()
+Gets the first element:
+
+```javascript
+set.first()
+```
+
+__`returns`: `element`__
+
+### last()
+Gets the last element:
+
+```javascript
+set.last()
+```
+
+__`returns`: `element`__
+
 ### bbox()
 Get the bounding box of all elements in the set:
 
@@ -2117,7 +2168,7 @@ set.animate(3000).fill('#ff0')
 __`returns`: `SVG.SetFX`__
 
 
-## Gradients
+## Gradient
 
 ### gradient()
 There are linear and radial gradients. The linear gradient can be created like this:
@@ -2251,7 +2302,7 @@ _This functionality requires the gradient.js module which is included in the def
 __`returns`: `value`__
 
 
-## Patterns
+## Pattern
 
 ### pattern()
 Creating a pattern is very similar to creating gradients
@@ -2303,6 +2354,62 @@ pattern.fill() //-> returns 'url(#SvgjsPattern1234)'
 __`returns`: `value`__
 
 
+## Marker
+
+### marker()
+Markers can be added to every individual point of a `line`, `polyline`, `polygon` and `path`. There are three types of markers: `start`, `mid` and `end`. Where `start` represents the first point, `end` the last and `mid` every point in between.
+
+```javascript
+var path = draw.path('M 100 200 C 200 100 300  0 400 100 C 500 200 600 300 700 200 C 800 100 900 100 900 100z')
+
+path.fill('none').stroke({ width: 1 })
+
+path.marker('start', 10, 10, function(add) {
+  add.circle(10).fill('#f06')
+})
+path.marker('mid', 10, 10, function(add) {
+  add.rect(10, 10)
+})
+path.marker('end', 20, 20, function(add) {
+  add.circle(6).center(4, 5)
+  add.circle(6).center(4, 15)
+  add.circle(6).center(16, 10)
+
+  this.fill('#0f6')
+})
+```
+
+The `marker()` method can be used in three ways. Firstly, a marker can be created on any container element (e.g. svg, nested, group, ...). This is useful if you plan to reuse the marker many times so it will create a marker in the defs but not show it yet:
+
+```javascript
+var marker = draw.marker(10, 10, function() {
+  add.rect(10, 10)
+})
+```
+
+Secondly a marker can be created and applied directly on its target element:
+
+```javascript
+path.marker('start', 10, 10, function() {
+  add.circle(10).fill('#f06')
+})
+```
+
+This will create a marker in the defs and apply it directly. Note that the first argument defines the position of the marker and that there are four arguments as opposed to three with the first example.
+
+Lastly, if a marker is created for reuse on a container element, it can be applied directly on the target element:
+
+```javascript
+path.marker('mid', marker)
+```
+
+Finally, to get a marker instance from the target element reference:
+
+```javascript
+path.reference('marker-end')
+```
+
+
 ## Data
 
 ### Setting
diff --git a/Rakefile b/Rakefile
index 8acad71..03d37f8 100755
--- a/Rakefile
+++ b/Rakefile
@@ -1,7 +1,7 @@
-SVGJS_VERSION = '1.0.0-rc.8'
+SVGJS_VERSION = '1.0.0-rc.9'
 
 # all available modules in the correct loading order
-MODULES = %w[ svg inventor regex default color array pointarray patharray number viewbox bbox rbox element parent container fx relative event defs group arrange mask clip gradient pattern doc shape use rect ellipse line poly path image text textpath nested hyperlink sugar set data memory loader helpers ]
+MODULES = %w[ svg selector inventor regex default color array pointarray patharray number viewbox bbox rbox element parent container fx relative event defs group arrange mask clip gradient pattern doc shape symbol use rect ellipse line poly path image text textpath nested hyperlink marker sugar set data memory loader helpers ]
 
 # how many bytes in a "kilobyte"
 KILO = 1024
@@ -138,13 +138,6 @@ task :check_whitespace do
   fail if flunked
 end
 
-desc "Generate docco documentation from source files"
-task :docco do
-  verbose false do
-    sh 'docco', *Dir['src/*.js']
-  end
-end
-
 # svg.js version number + git sha if available
 def version_string
   desc = `git describe --tags HEAD 2>&1`.chomp
diff --git a/bower.json b/bower.json
index 1cd7ce4..7ddcee4 100755
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "svg.js",
-  "version":"1.0.0-rc.8",
+  "version":"1.0.0-rc.9",
   "homepage": "http://svgjs.com/",
   "authors": [
     "Wout Fierens <wout@impinc.co.uk>"
diff --git a/component.json b/component.json
index d8d389d..ebdd7c1 100755
--- a/component.json
+++ b/component.json
@@ -2,7 +2,7 @@
   "name": "svg.js",
   "repo": "wout/svg.js",
   "description": "A lightweight library for manipulating and animating SVG",
-  "version": "1.0.0-rc.8",
+  "version": "1.0.0-rc.9",
   "keywords": ["svg"],
   "author": "Wout Fierens <wout@impinc.co.uk>",
   "main": "dist/svg.js",
diff --git a/dist/svg.js b/dist/svg.js
index b3a832e..29d0711 100755
--- a/dist/svg.js
+++ b/dist/svg.js
@@ -1,4 +1,4 @@
-/* svg.js 1.0.0-rc.8-3-g7eca094 - svg inventor regex default color array pointarray patharray number viewbox bbox rbox element parent container fx relative event defs group arrange mask clip gradient pattern doc shape use rect ellipse line poly path image text textpath nested hyperlink sugar set data memory loader helpers - svgjs.com/license */
+/* svg.js 1.0.0-rc.9 - svg selector inventor regex default color array pointarray patharray number viewbox bbox rbox element parent container fx relative event defs group arrange mask clip gradient pattern doc shape symbol use rect ellipse line poly path image text textpath nested hyperlink marker sugar set data memory loader helpers - svgjs.com/license */
 ;(function() {
 
   var SVG = this.SVG = function(element) {
@@ -56,12 +56,6 @@
       SVG.Set.inherit()
   }
   
-  // Method for getting an element by id
-  SVG.get = function(id) {
-    var node = document.getElementById(id)
-    if (node) return node.instance
-  }
-  
   // Initialize parsing element
   SVG.prepare = function(element) {
     /* select document body and create invisible svg element */
@@ -90,6 +84,11 @@
   if (!SVG.supported) return false
 
 
+  SVG.get = function(id) {
+    var node = document.getElementById(idFromReference(id) || id)
+    if (node) return node.instance
+  }
+
   SVG.invent = function(config) {
   	/* create element initializer */
   	var initializer = typeof config.create == 'function' ?
@@ -122,6 +121,9 @@
     
     /* parse rgb value */
   , rgb:          /rgb\((\d+),(\d+),(\d+)\)/
+    
+    /* parse reference id */
+  , reference:    /#([a-z0-9\-_]+)/i
   
     /* test hex value */
   , isHex:        /^#[a-f0-9]{3,6}$/i
@@ -1046,10 +1048,9 @@
     , size: function(width, height) {
         var p = proportionalSize(this.bbox(), width, height)
   
-        return this.attr({
-          width:  new SVG.Number(p.width)
-        , height: new SVG.Number(p.height)
-        })
+        return this
+          .width(new SVG.Number(p.width))
+          .height(new SVG.Number(p.height))
       }
       // Clone element
     , clone: function() {
@@ -1293,6 +1294,10 @@
         
         return this
       }
+      // Get / set id
+    , id: function(id) {
+        return this.attr('id', id)
+      }
       // Get bounding box
     , bbox: function() {
         return new SVG.BBox(this)
@@ -1369,6 +1374,10 @@
         }
         return this
       }
+      // Get referenced element form attribute value
+    , reference: function(attr) {
+        return SVG.get(this.attr(attr))
+      }
       // Private: find svg parent by instance
     , _parent: function(parent) {
         var element = this
@@ -2074,6 +2083,7 @@
   
     // Inherit from
   , inherit: SVG.Container
+    
   })
 
   SVG.G = SVG.invent({
@@ -2345,7 +2355,7 @@
       }
       // Return the fill id
     , fill: function() {
-        return 'url(#' + this.attr('id') + ')'
+        return 'url(#' + this.id() + ')'
       }
       // Alias string convertion to fill
     , toString: function() {
@@ -2412,7 +2422,7 @@
   , extend: {
       // Return the fill id
   	  fill: function() {
-  	    return 'url(#' + this.attr('id') + ')'
+  	    return 'url(#' + this.id() + ')'
   	  }
   	  // Update pattern by rebuilding
   	, update: function(block) {
@@ -2550,6 +2560,23 @@
   
   })
 
+  SVG.Symbol = SVG.invent({
+    // Initialize node
+    create: 'symbol'
+  
+    // Inherit from
+  , inherit: SVG.Container
+  
+    // Add parent method
+  , construct: {
+      // Create a new symbol
+      symbol: function() {
+        return this.defs().put(new SVG.Symbol)
+      }
+    }
+    
+  })
+
   SVG.Use = SVG.invent({
     // Initialize node
     create: 'use'
@@ -3131,6 +3158,10 @@
       
       return this
     }
+    // Get length of text element
+  , length: function() {
+      return this.node.getComputedTextLength()
+    }
   })
   
   // Register rebuild event
@@ -3247,6 +3278,87 @@
     
   })
 
+  SVG.Marker = SVG.invent({
+    // Initialize node
+    create: 'marker'
+  
+    // Inherit from
+  , inherit: SVG.Container
+  
+    // Add class methods
+  , extend: {
+      // Set width of element
+      width: function(width) {
+        return this.attr('markerWidth', width)
+      }
+      // Set height of element
+    , height: function(height) {
+        return this.attr('markerHeight', height)
+      }
+      // Set marker refX and refY
+    , ref: function(x, y) {
+        return this.attr('refX', x).attr('refY', y)
+      }
+      // Update marker
+    , update: function(block) {
+        /* remove all content */
+        this.clear()
+        
+        /* invoke passed block */
+        if (typeof block == 'function')
+          block.call(this, this)
+        
+        return this
+      }
+      // Return the fill id
+    , toString: function() {
+        return 'url(#' + this.id() + ')'
+      }
+    }
+  
+    // Add parent method
+  , construct: {
+      marker: function(width, height, block) {
+        // Create marker element in defs
+        return this.defs().marker(width, height, block)
+      }
+    }
+  
+  })
+  
+  SVG.extend(SVG.Defs, {
+    // Create marker
+    marker: function(width, height, block) {
+      // Set default viewbox to match the width and height, set ref to cx and cy and set orient to auto
+      return this.put(new SVG.Marker)
+        .size(width, height)
+        .ref(width / 2, height / 2)
+        .viewbox(0, 0, width, height)
+        .attr('orient', 'auto')
+        .update(block)
+    }
+    
+  })
+  
+  SVG.extend(SVG.Line, SVG.Polyline, SVG.Polygon, SVG.Path, {
+    // Create and attach markers
+    marker: function(marker, width, height, block) {
+      var attr = ['marker']
+  
+      // Build attribute name
+      if (marker != 'all') attr.push(marker)
+      attr = attr.join('-')
+  
+      // Set marker attribute
+      marker = arguments[1] instanceof SVG.Marker ?
+        arguments[1] :
+        this.doc().marker(width, height, block)
+      
+      return this.attr(attr, marker)
+    }
+    
+  })
+
   var sugar = {
     stroke: ['color', 'width', 'opacity', 'linecap', 'linejoin', 'miterlimit', 'dasharray', 'dashoffset']
   , fill:   ['color', 'opacity', 'rule']
@@ -3410,6 +3522,14 @@
     , get: function(i) {
         return this.members[i]
       }
+      // Get first member
+    , first: function() {
+        return this.get(0)
+      }
+      // Get last member
+    , last: function() {
+        return this.get(this.members.length - 1)
+      }
       // Default value
     , valueOf: function() {
         return this.members
@@ -3685,6 +3805,13 @@
     return o
   }
   
+  // Get id from reference string
+  function idFromReference(url) {
+    var m = url.toString().match(SVG.regex.reference)
+  
+    if (m) return m[1]
+  }
+  
   // Shim layer with setTimeout fallback by Paul Irish
   window.requestAnimFrame = (function(){
     return  window.requestAnimationFrame       ||
diff --git a/dist/svg.min.js b/dist/svg.min.js
index f975b0c..8ee65fd 100755
--- a/dist/svg.min.js
+++ b/dist/svg.min.js
@@ -1,2 +1,2 @@
-(function(){function t(t){return t.toLowerCase().replace(/-(.)/g,function(t,e){return e.toUpperCase()})}function e(t){return 4==t.length?["#",t.substring(1,2),t.substring(1,2),t.substring(2,3),t.substring(2,3),t.substring(3,4),t.substring(3,4)].join(""):t}function i(t){var e=t.toString(16);return 1==e.length?"0"+e:e}function n(t,e,i){return(null==e||null==i)&&(null==i?i=t.height/t.width*e:null==e&&(e=t.width/t.height*i)),{width:e,height:i}}function r(t,e){return"number"==typeof t.from?t.from+(t.to-t.from)*e:t instanceof a.Color||t instanceof a.Number?t.at(e):1>e?t.from:t.to}function s(t){for(var e=0,i=t.length,n="";i>e;e++)n+=t[e][0],null!=t[e][1]&&(n+=t[e][1],null!=t[e][2]&&(n+=" ",n+=t[e][2],null!=t[e][3]&&(n+=" ",n+=t[e][3],n+=" ",n+=t[e][4],null!=t[e][5]&&(n+=" ",n+=t[e][5],n+=" ",n+=t[e][6],null!=t[e][7]&&(n+=" ",n+=t[e][7])))));return n+" "}function h(t){t.x2=t.x+t.width,t.y2=t.y+t.height,t.cx=t.x+t.width/2,t.cy=t.y+t.height/2}function o(t){if(t.matrix){var e=t.matrix.replace(/\s/g,"").split(",");6==e.length&&(t.a=parseFloat(e[0]),t.b=parseFloat(e[1]),t.c=parseFloat(e[2]),t.d=parseFloat(e[3]),t.e=parseFloat(e[4]),t.f=parseFloat(e[5]))}return t}var a=this.SVG=function(t){return a.supported?(t=new a.Doc(t),a.parser||a.prepare(t),t):void 0};if(a.ns="http://www.w3.org/2000/svg",a.xmlns="http://www.w3.org/2000/xmlns/",a.xlink="http://www.w3.org/1999/xlink",a.did=1e3,a.eid=function(t){return"Svgjs"+t.charAt(0).toUpperCase()+t.slice(1)+a.did++},a.create=function(t){var e=document.createElementNS(this.ns,t);return e.setAttribute("id",this.eid(t)),e},a.extend=function(){var t,e,i,n;for(t=[].slice.call(arguments),e=t.pop(),n=t.length-1;n>=0;n--)if(t[n])for(i in e)t[n].prototype[i]=e[i];a.Set&&a.Set.inherit&&a.Set.inherit()},a.get=function(t){var e=document.getElementById(t);return e?e.instance:void 0},a.prepare=function(t){var e=document.getElementsByTagName("body")[0],i=(e?new 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t?document.getElementById(t):t,this.constructor.call(this,"svg"==this.parent.nodeName?this.parent:u.create("svg")),this.attr({xmlns:u.ns,version:"1.1",width:"100%",height:"100%"}).attr("xmlns:xlink",u.xlink,u.xmlns),this._defs=new u.Defs,this._defs.parent=this,this.node.appendChild(this._defs.node),this.doSpof=!1,this.parent!=this.node&&this.stage()},inherit:u.Container,extend:{stage:function(){var t=this;return this.parent.appendChild(this.node),t.spof(),u.on(window,"resize",function(){t.spof()}),this},defs:function(){return this._defs},spof:function(){if(this.doSpof){var t=this.node.getScreenCTM();t&&this.style("left",-t.e%1+"px").style("top",-t.f%1+"px")}return this},fixSubPixelOffset:function(){return this.doSpof=!0,this}}}),u.Shape=u.invent({create:function(t){this.constructor.call(this,t)},inherit:u.Element}),u.Symbol=u.invent({create:"symbol",inherit:u.Container,construct:{symbol:function(){return this.defs().put(new 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i=n(this.bbox(),t,e);return this.attr({rx:new u.Number(i.width).divide(2),ry:new u.Number(i.height).divide(2)})}},construct:{circle:function(t){return this.ellipse(t,t)},ellipse:function(t,e){return this.put(new u.Ellipse).size(t,e).move(0,0)}}}),u.Line=u.invent({create:"line",inherit:u.Shape,extend:{x:function(t){var e=this.bbox();return null==t?e.x:this.attr({x1:this.attr("x1")-e.x+t,x2:this.attr("x2")-e.x+t})},y:function(t){var e=this.bbox();return null==t?e.y:this.attr({y1:this.attr("y1")-e.y+t,y2:this.attr("y2")-e.y+t})},cx:function(t){var e=this.bbox().width/2;return null==t?this.x()+e:this.x(t-e)},cy:function(t){var e=this.bbox().height/2;return null==t?this.y()+e:this.y(t-e)},width:function(t){var e=this.bbox();return null==t?e.width:this.attr(this.attr("x1")<this.attr("x2")?"x2":"x1",e.x+t)},height:function(t){var e=this.bbox();return null==t?e.height:this.attr(this.attr("y1")<this.attr("y2")?"y2":"y1",e.y+t)
+},size:function(t,e){var i=n(this.bbox(),t,e);return this.width(i.width).height(i.height)},plot:function(t,e,i,n){return this.attr({x1:t,y1:e,x2:i,y2:n})}},construct:{line:function(t,e,i,n){return this.put((new u.Line).plot(t,e,i,n))}}}),u.Polyline=u.invent({create:"polyline",inherit:u.Shape,construct:{polyline:function(t){return this.put(new u.Polyline).plot(t)}}}),u.Polygon=u.invent({create:"polygon",inherit:u.Shape,construct:{polygon:function(t){return this.put(new u.Polygon).plot(t)}}}),u.extend(u.Polyline,u.Polygon,{morphArray:u.PointArray,plot:function(t){return this.attr("points",this.array=new u.PointArray(t,[[0,0]]))},move:function(t,e){return this.attr("points",this.array.move(t,e))},x:function(t){return null==t?this.bbox().x:this.move(t,this.bbox().y)},y:function(t){return null==t?this.bbox().y:this.move(this.bbox().x,t)},width:function(t){var e=this.bbox();return null==t?e.width:this.size(t,e.height)},height:function(t){var e=this.bbox();return null==t?e.height:this.size(e.width,t)},size:function(t,e){var i=n(this.bbox(),t,e);return this.attr("points",this.array.size(i.width,i.height))}}),u.Path=u.invent({create:"path",inherit:u.Shape,extend:{plot:function(t){return this.attr("d",this.array=new u.PathArray(t,[["M",0,0]]))},move:function(t,e){return this.attr("d",this.array.move(t,e))},x:function(t){return null==t?this.bbox().x:this.move(t,this.bbox().y)},y:function(t){return null==t?this.bbox().y:this.move(this.bbox().x,t)},size:function(t,e){var i=n(this.bbox(),t,e);return this.attr("d",this.array.size(i.width,i.height))},width:function(t){return null==t?this.bbox().width:this.size(t,this.bbox().height)},height:function(t){return null==t?this.bbox().height:this.size(this.bbox().width,t)}},construct:{path:function(t){return this.put(new u.Path).plot(t)}}}),u.Image=u.invent({create:"image",inherit:u.Shape,extend:{load:function(t){if(!t)return this;var e=this,i=document.createElement("img");return i.onload=function(){var n=e.doc(u.Pattern);0==e.width()&&0==e.height()&&e.size(i.width,i.height),n&&0==n.width()&&0==n.height()&&n.size(e.width(),e.height()),"function"==typeof e._loaded&&e._loaded.call(e,{width:i.width,height:i.height,ratio:i.width/i.height,url:t})},this.attr("href",i.src=this.src=t,u.xlink)},loaded:function(t){return this._loaded=t,this}},construct:{image:function(t,e,i){return this.put(new u.Image).load(t).size(e||0,i||e||0)}}}),u.Text=u.invent({create:function(){this.constructor.call(this,u.create("text")),this._leading=new u.Number(1.3),this._rebuild=!0,this._build=!1,this.attr("font-family",u.defaults.attrs["font-family"])},inherit:u.Shape,extend:{x:function(t){return null==t?this.attr("x"):(this.textPath||this.lines.each(function(){this.newLined&&this.x(t)}),this.attr("x",t))},y:function(t){var e=this.attr("y"),i="number"==typeof e?e-this.bbox().y:0;return null==t?"number"==typeof e?e-i:e:this.attr("y","number"==typeof t?t+i:t)},cx:function(t){return null==t?this.bbox().cx:this.x(t-this.bbox().width/2)},cy:function(t){return null==t?this.bbox().cy:this.y(t-this.bbox().height/2)},text:function(t){if("undefined"==typeof t)return this.content;if(this.clear().build(!0),"function"==typeof t)t.call(this,this);else{t=(this.content=t).split("\n");for(var e=0,i=t.length;i>e;e++)this.tspan(t[e]).newLine()}return this.build(!1).rebuild()},size:function(t){return this.attr("font-size",t).rebuild()},leading:function(t){return null==t?this._leading:(this._leading=new u.Number(t),this.rebuild())},rebuild:function(t){if("boolean"==typeof t&&(this._rebuild=t),this._rebuild){var e=this;this.lines.each(function(){this.newLined&&(this.textPath||this.attr("x",e.attr("x")),this.attr("dy",e._leading*new u.Number(e.attr("font-size"))))}),this.fire("rebuild")}return this},build:function(t){return this._build=!!t,this}},construct:{text:function(t){return this.put(new u.Text).text(t)},plain:function(t){return this.put(new u.Text).plain(t)}}}),u.TSpan=u.invent({create:"tspan",inherit:u.Shape,extend:{text:function(t){return"function"==typeof t?t.call(this,this):this.plain(t),this},dx:function(t){return this.attr("dx",t)},dy:function(t){return this.attr("dy",t)},newLine:function(){var t=this.doc(u.Text);return this.newLined=!0,this.dy(t._leading*t.attr("font-size")).attr("x",t.x())}}}),u.extend(u.Text,u.TSpan,{plain:function(t){return this._build===!1&&this.clear(),this.node.appendChild(document.createTextNode(this.content=t)),this},tspan:function(t){var e=(this.textPath||this).node,i=new u.TSpan;return this._build===!1&&this.clear(),e.appendChild(i.node),i.parent=this,this instanceof u.Text&&this.lines.add(i),i.text(t)},clear:function(){for(var t=(this.textPath||this).node;t.hasChildNodes();)t.removeChild(t.lastChild);return this instanceof u.Text&&(delete this.lines,this.lines=new u.Set,this.content=""),this},length:function(){return this.node.getComputedTextLength()}}),u.registerEvent("rebuild"),u.TextPath=u.invent({create:"textPath",inherit:u.Element,parent:u.Text,construct:{path:function(t){for(this.textPath=new u.TextPath;this.node.hasChildNodes();)this.textPath.node.appendChild(this.node.firstChild);return this.node.appendChild(this.textPath.node),this.track=this.doc().defs().path(t),this.textPath.parent=this,this.textPath.attr("href","#"+this.track,u.xlink),this},plot:function(t){return this.track&&this.track.plot(t),this}}}),u.Nested=u.invent({create:function(){this.constructor.call(this,u.create("svg")),this.style("overflow","visible")},inherit:u.Container,construct:{nested:function(){return this.put(new u.Nested)}}}),u.A=u.invent({create:"a",inherit:u.Container,extend:{to:function(t){return this.attr("href",t,u.xlink)},show:function(t){return this.attr("show",t,u.xlink)},target:function(t){return this.attr("target",t)}},construct:{link:function(t){return this.put(new u.A).to(t)}}}),u.extend(u.Element,{linkTo:function(t){var e=new u.A;return"function"==typeof t?t.call(e,e):e.to(t),this.parent.put(e).put(this)}}),u.Marker=u.invent({create:"marker",inherit:u.Container,extend:{width:function(t){return this.attr("markerWidth",t)},height:function(t){return this.attr("markerHeight",t)},ref:function(t,e){return this.attr("refX",t).attr("refY",e)},update:function(t){return this.clear(),"function"==typeof t&&t.call(this,this),this},toString:function(){return"url(#"+this.id()+")"}},construct:{marker:function(t,e,i){return this.defs().marker(t,e,i)}}}),u.extend(u.Defs,{marker:function(t,e,i){return this.put(new u.Marker).size(t,e).ref(t/2,e/2).viewbox(0,0,t,e).attr("orient","auto").update(i)}}),u.extend(u.Line,u.Polyline,u.Polygon,u.Path,{marker:function(t,e,i,n){var r=["marker"];return"all"!=t&&r.push(t),r=r.join("-"),t=arguments[1]instanceof u.Marker?arguments[1]:this.doc().marker(e,i,n),this.attr(r,t)}});var l={stroke:["color","width","opacity","linecap","linejoin","miterlimit","dasharray","dashoffset"],fill:["color","opacity","rule"],prefix:function(t,e){return"color"==e?t:t+"-"+e}};["fill","stroke"].forEach(function(t){var e,i={};i[t]=function(i){if("string"==typeof i||u.Color.isRgb(i)||i&&"function"==typeof i.fill)this.attr(t,i);else for(e=l[t].length-1;e>=0;e--)null!=i[l[t][e]]&&this.attr(l.prefix(t,l[t][e]),i[l[t][e]]);return this},u.extend(u.Element,u.FX,i)}),u.extend(u.Element,u.FX,{rotate:function(t,e,i){return this.transform({rotation:t||0,cx:e,cy:i})},skew:function(t,e){return this.transform({skewX:t||0,skewY:e||0})},scale:function(t,e){return this.transform({scaleX:t,scaleY:null==e?t:e})},translate:function(t,e){return this.transform({x:t,y:e})},matrix:function(t){return this.transform({matrix:t})},opacity:function(t){return this.attr("opacity",t)}}),u.extend(u.Rect,u.Ellipse,u.FX,{radius:function(t,e){return this.attr({rx:t,ry:e||t})}}),u.extend(u.Path,{length:function(){return this.node.getTotalLength()},pointAt:function(t){return this.node.getPointAtLength(t)}}),u.extend(u.Parent,u.Text,u.FX,{font:function(t){for(var e in t)"leading"==e?this.leading(t[e]):"anchor"==e?this.attr("text-anchor",t[e]):"size"==e||"family"==e||"weight"==e||"stretch"==e||"variant"==e||"style"==e?this.attr("font-"+e,t[e]):this.attr(e,t[e]);return this}}),u.Set=u.invent({create:function(){this.clear()},extend:{add:function(){var t,e,i=[].slice.call(arguments);for(t=0,e=i.length;e>t;t++)this.members.push(i[t]);return this},remove:function(t){var e=this.index(t);return e>-1&&this.members.splice(e,1),this},each:function(t){for(var e=0,i=this.members.length;i>e;e++)t.apply(this.members[e],[e,this.members]);return this},clear:function(){return this.members=[],this},has:function(t){return this.index(t)>=0},index:function(t){return this.members.indexOf(t)},get:function(t){return this.members[t]},first:function(){return this.get(0)},last:function(){return this.get(this.members.length-1)},valueOf:function(){return this.members},bbox:function(){var t=new u.BBox;if(0==this.members.length)return t;var e=this.members[0].rbox();return t.x=e.x,t.y=e.y,t.width=e.width,t.height=e.height,this.each(function(){t=t.merge(this.rbox())}),t}},construct:{set:function(){return new u.Set}}}),u.SetFX=u.invent({create:function(t){this.set=t}}),u.Set.inherit=function(){var t,e=[];for(var t in u.Shape.prototype)"function"==typeof u.Shape.prototype[t]&&"function"!=typeof u.Set.prototype[t]&&e.push(t);e.forEach(function(t){u.Set.prototype[t]=function(){for(var e=0,i=this.members.length;i>e;e++)this.members[e]&&"function"==typeof this.members[e][t]&&this.members[e][t].apply(this.members[e],arguments);return"animate"==t?this.fx||(this.fx=new u.SetFX(this)):this}}),e=[];for(var t in u.FX.prototype)"function"==typeof u.FX.prototype[t]&&"function"!=typeof u.SetFX.prototype[t]&&e.push(t);e.forEach(function(t){u.SetFX.prototype[t]=function(){for(var e=0,i=this.set.members.length;i>e;e++)this.set.members[e].fx[t].apply(this.set.members[e].fx,arguments);return this}})},u.extend(u.Element,{data:function(t,e,i){if("object"==typeof t)for(e in t)this.data(e,t[e]);else if(arguments.length<2)try{return JSON.parse(this.attr("data-"+t))}catch(n){return this.attr("data-"+t)}else this.attr("data-"+t,null===e?null:i===!0||"string"==typeof e||"number"==typeof e?e:JSON.stringify(e));return this}}),u.extend(u.Element,{remember:function(t,e){if("object"==typeof arguments[0])for(var e in t)this.remember(e,t[e]);else{if(1==arguments.length)return this.memory()[t];this.memory()[t]=e}return this},forget:function(){if(0==arguments.length)this._memory={};else for(var t=arguments.length-1;t>=0;t--)delete this.memory()[arguments[t]];return this},memory:function(){return this._memory||(this._memory={})}}),"function"==typeof define&&define.amd?define(function(){return u}):"undefined"!=typeof exports&&(exports.SVG=u),window.requestAnimFrame=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.msRequestAnimationFrame||function(t){window.setTimeout(t,1e3/60)}}()}).call(this);
\ No newline at end of file
diff --git a/package.json b/package.json
index e67969e..a704576 100755
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
 , "keywords":     ["svg", "vector", "graphics", "animation"]
 , "author":       "Wout Fierens <wout@impinc.co.uk>"
 , "main":         "dist/svg.js"
-, "version":      "1.0.0-rc.8"
+, "version":      "1.0.0-rc.9"
 , "jam": {
     "include": [
       "dist/svg.js"
diff --git a/spec/index.html b/spec/index.html
index 78d95d8..2dd41b2 100755
--- a/spec/index.html
+++ b/spec/index.html
@@ -29,6 +29,7 @@
 
 <!-- include spec files here... -->
 <script type="text/javascript" src="spec/svg.js"></script>
+<script type="text/javascript" src="spec/selector.js"></script>
 <script type="text/javascript" src="spec/regex.js"></script>
 <script type="text/javascript" src="spec/container.js"></script>
 <script type="text/javascript" src="spec/element.js"></script>
@@ -41,15 +42,18 @@
 <script type="text/javascript" src="spec/polyline.js"></script>
 <script type="text/javascript" src="spec/polygon.js"></script>
 <script type="text/javascript" src="spec/path.js"></script>
+<script type="text/javascript" src="spec/marker.js"></script>
 <script type="text/javascript" src="spec/image.js"></script>
 <script type="text/javascript" src="spec/text.js"></script>
 <script type="text/javascript" src="spec/textpath.js"></script>
 <script type="text/javascript" src="spec/doc.js"></script>
+<script type="text/javascript" src="spec/defs.js"></script>
 <script type="text/javascript" src="spec/group.js"></script>
 <script type="text/javascript" src="spec/set.js"></script>
 <script type="text/javascript" src="spec/gradient.js"></script>
 <script type="text/javascript" src="spec/pattern.js"></script>
 <script type="text/javascript" src="spec/use.js"></script>
+<script type="text/javascript" src="spec/symbol.js"></script>
 <script type="text/javascript" src="spec/mask.js"></script>
 <script type="text/javascript" src="spec/clip.js"></script>
 <script type="text/javascript" src="spec/color.js"></script>
diff --git a/spec/spec/defs.js b/spec/spec/defs.js
new file mode 100644
index 0000000..5e5da08
--- /dev/null
+++ b/spec/spec/defs.js
@@ -0,0 +1,12 @@
+describe('Defs', function() {
+  var defs
+
+  beforeEach(function() {
+    defs = draw.defs()
+  })
+
+  it('creates an instance of SVG.Defs', function() {
+    expect(defs instanceof SVG.Defs).toBeTruthy()
+  })
+
+})
\ No newline at end of file
diff --git a/spec/spec/element.js b/spec/spec/element.js
index a0c7a2a..5bda0d2 100755
--- a/spec/spec/element.js
+++ b/spec/spec/element.js
@@ -85,6 +85,22 @@ describe('Element', function() {
       expect(rect.attr().x).toBe('69%')
     })
   })
+
+  describe('id()', function() {
+    var rect
+    
+    beforeEach(function() {
+      rect = draw.rect(100,100)
+    })
+    
+    it('gets the value if the id attribute without an argument', function() {
+      expect(rect.id()).toBe(rect.attr('id'))
+    })
+    it('sets the value of the id', function() {
+      rect.id('new_id')
+      expect(rect.attr('id')).toBe('new_id')
+    })
+  })
   
   describe('style()', function() {
     it('should set the style with key and value arguments', function() {
@@ -384,17 +400,27 @@ describe('Element', function() {
       element.toggleClass('one')
       expect(element.hasClass('one')).toBeTruthy()
     })
-
     it('removes the class when it already exists', function(){
       var element = draw.rect(100,100)
       element.addClass('one')
       element.toggleClass('one')
       expect(element.hasClass('one')).toBeFalsy()
     })
-
     it('returns the svg instance', function() {
       var element = draw.rect(100,100)
       expect(element.toggleClass('one')).toEqual(element)
     })
   })
+
+  describe('reference()', function() {
+    it('gets a referenced element from a given attribute', function() {
+      var rect = draw.defs().rect(100, 100)
+        , use  = draw.use(rect)
+        , mark = draw.marker(10, 10)
+        , path = draw.path(svgPath).marker('end', mark)
+
+      expect(use.reference('href')).toBe(rect)
+      expect(path.reference('marker-end')).toBe(mark)
+    })
+  })
 })
diff --git a/spec/spec/helper.js b/spec/spec/helper.js
index 552ca6c..e3cba61 100755
--- a/spec/spec/helper.js
+++ b/spec/spec/helper.js
@@ -15,7 +15,7 @@ loremIpsum = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras soda
 
 /* approximately helper */
 function approximately(number, precision) {
-  precision = precision == null ? 2.5 : precision
+  precision = precision == null ? 1.5 : precision
   
   return Math.round(number / precision) * precision
 }
diff --git a/spec/spec/marker.js b/spec/spec/marker.js
new file mode 100644
index 0000000..8d18c85
--- /dev/null
+++ b/spec/spec/marker.js
@@ -0,0 +1,89 @@
+describe('Marker', function() {
+  
+  describe('on a container element', function() {
+    var marker
+
+    beforeEach(function() {
+      marker = draw.marker(10, 12, function(add) {
+        add.rect(10, 12)
+
+        this.ref(5, 6)
+      })
+    })
+
+    it('creates an instance of SVG.Marker', function() {
+      expect(marker instanceof SVG.Marker).toBeTruthy()
+    })
+
+    it('creates marker in defs', function() {
+      expect(marker.parent instanceof SVG.Defs).toBeTruthy()
+    })
+
+    describe('marker()', function() {
+      it('returns the marker element', function() {
+        expect(marker = draw.marker(10, 12)).toBe(marker)
+      })
+      it('sets the refX to half of the given width', function() {
+        marker = draw.marker(10, 12)
+        expect(marker.node.getAttribute('refX')).toBe('5')
+      })
+      it('sets the refY to half of the given height', function() {
+        marker = draw.marker(13, 15)
+        expect(marker.node.getAttribute('refY')).toBe('7.5')
+      })
+    })
+
+  })
+  
+  describe('on a target path', function() {
+    var path, marker
+
+    beforeEach(function() {
+      path = draw.path('M 100 200 C 200 100 300  0 400 100 C 500 200 600 300 700 200 C 800 100 900 100 900 100')
+
+      path.marker('mid', 10, 12, function(add) {
+        add.rect(10, 12)
+
+        this.ref(5, 6)
+      })
+
+      marker = path.marker('mid')
+    })
+
+    it('creates an instance of SVG.Marker', function() {
+      expect(path.reference('marker-mid') instanceof SVG.Marker).toBeTruthy()
+    })
+
+    describe('marker()', function() {
+      it('returns the target element', function() {
+        expect(path.marker('start', 10, 12)).toBe(path)
+      })
+      it('creates a marker and applies it to the marker-start attribute', function() {
+        path.marker('start', 10, 12)
+        marker = path.reference('marker-start')
+
+        expect(path.node.getAttribute('marker-start')).toBe(marker.toString())
+      })
+      it('creates a marker and applies it to the marker-mid attribute', function() {
+        path.marker('mid', 10, 12)
+        marker = path.reference('marker-mid')
+
+        expect(path.node.getAttribute('marker-mid')).toBe(marker.toString())
+      })
+      it('creates a marker and applies it to the marker-end attribute', function() {
+        path.marker('end', 10, 12)
+        marker = path.reference('marker-end')
+
+        expect(path.node.getAttribute('marker-end')).toBe(marker.toString())
+      })
+      it('accepts an instance of an existing marker element as the second argument', function() {
+        marker = draw.marker(11, 11)
+        path.marker('mid', marker)
+
+        expect(path.node.getAttribute('marker-mid')).toBe(marker.toString())
+      })
+    })
+  })
+
+
+})
\ No newline at end of file
diff --git a/spec/spec/regex.js b/spec/spec/regex.js
index f64991a..4b36175 100644
--- a/spec/spec/regex.js
+++ b/spec/spec/regex.js
@@ -1,26 +1,37 @@
 describe('Regex', function() {
 
-  describe('unit', function() {
-    it('is true with a positive unit value', function() {
-      expect(SVG.regex.unit.test('10%')).toBeTruthy()
-    })
-    it('is true with a negative unit value', function() {
-      expect(SVG.regex.unit.test('-11%')).toBeTruthy()
-    })
-    it('is false with a positive unit value', function() {
-      expect(SVG.regex.unit.test('NotAUnit')).toBeFalsy()
+  describe('matchers', function() {
+    describe('unit', function() {
+      var match
+
+      it('is true with a positive unit value', function() {
+        match = ('10%').match(SVG.regex.unit)
+        expect(match[1]).toBe('10')
+        expect(match[2]).toBe('%')
+      })
+      it('is true with a negative unit value', function() {
+        match = ('-11%').match(SVG.regex.unit)
+        expect(match[1]).toBe('-11')
+        expect(match[2]).toBe('%')
+      })
+      it('is false with a positive unit value', function() {
+        match = ('NotAUnit').match(SVG.regex.unit)
+        expect(match).toBeNull()
+      })
     })
   })
 
-  describe('isEvent', function() {
-    it('is true with a namespaced and lowercase name', function() {
-      expect(SVG.regex.isEvent.test('my:event')).toBeTruthy()
-    })
-    it('is true with a namespaced and camelCase name', function() {
-      expect(SVG.regex.isEvent.test('mt:fabulousEvent')).toBeTruthy()
-    })
-    it('is false without a namespace', function() {
-      expect(SVG.regex.isEvent.test('idontlinkenamespaces')).toBeFalsy()
+  describe('testers', function() {
+    describe('isEvent', function() {
+      it('is true with a namespaced and lowercase name', function() {
+        expect(SVG.regex.isEvent.test('my:event')).toBeTruthy()
+      })
+      it('is true with a namespaced and camelCase name', function() {
+        expect(SVG.regex.isEvent.test('mt:fabulousEvent')).toBeTruthy()
+      })
+      it('is false without a namespace', function() {
+        expect(SVG.regex.isEvent.test('idontlinkenamespaces')).toBeFalsy()
+      })
     })
   })
 
diff --git a/spec/spec/selector.js b/spec/spec/selector.js
new file mode 100644
index 0000000..4727bfd
--- /dev/null
+++ b/spec/spec/selector.js
@@ -0,0 +1,27 @@
+describe('Selector', function() {
+
+  describe('get()', function() {
+    it('gets an element\'s instance by id', function() {
+      var rect = draw.rect(111, 333)
+      
+      expect(SVG.get(rect.attr('id'))).toBe(rect)
+    })
+    it('makes all the element\'s methods available', function() {
+      var element = draw.group()
+        , got = SVG.get(element.attr('id'))
+      
+      expect(got.transform()).toEqual(SVG.defaults.trans())
+      expect(got.attr()).toEqual(element.attr())
+    })
+    it('gets a referenced element by attribute value', function() {
+      var rect = draw.defs().rect(100, 100)
+        , use  = draw.use(rect)
+        , mark = draw.marker(10, 10)
+        , path = draw.path(svgPath).marker('end', mark)
+
+      expect(SVG.get(use.attr('href'))).toBe(rect)
+      expect(SVG.get(path.attr('marker-end'))).toBe(mark)
+    })
+  })
+  
+})
\ No newline at end of file
diff --git a/spec/spec/set.js b/spec/spec/set.js
index 0eb822d..1238ee7 100755
--- a/spec/spec/set.js
+++ b/spec/spec/set.js
@@ -16,7 +16,7 @@ describe('Set', function() {
   })
 
   it('creates the set method on SVG.Container instances', function() {
-    expect(draw.set() instanceof SVG.Set).toBe(true)
+    expect(draw.set() instanceof SVG.Set).toBeTruthy()
   })
 
   describe('add()', function() {
@@ -75,16 +75,30 @@ describe('Set', function() {
   })
 
   describe('get()', function() {
-    it('returns member ar given index', function() {
+    it('returns member at given index', function() {
       set.add(e1).add(e2).add(e3).add(e4).add(e5)
       expect(set.get(2)).toBe(e3)
     })
   })
 
+  describe('first()', function() {
+    it('returns first member', function() {
+      set.add(e1).add(e2).add(e3).add(e4).add(e5)
+      expect(set.first()).toBe(e1)
+    })
+  })
+
+  describe('last()', function() {
+    it('returns last member', function() {
+      set.add(e1).add(e2).add(e3).add(e4).add(e5)
+      expect(set.last()).toBe(e5)
+    })
+  })
+
   describe('has()', function() {
     it('checks if a given element is present in set', function() {
       set.add(e1).add(e2).add(e3).add(e4).add(e5)
-      expect(set.has(e4)).toBe(true)
+      expect(set.has(e4)).toBeTruthy()
     })
   })
 
@@ -120,7 +134,7 @@ describe('Set', function() {
     it('returns an instance of SVG.BBox', function() {
       set.add(e1).add(e2).add(e3).add(e4).add(e5)
 
-      expect(set.bbox() instanceof SVG.BBox).toBe(true)
+      expect(set.bbox() instanceof SVG.BBox).toBeTruthy()
     })
     it('returns an empty bounding box wiht no members', function() {
       var box = set.bbox()
diff --git a/spec/spec/svg.js b/spec/spec/svg.js
index 843bb89..cc9f7be 100755
--- a/spec/spec/svg.js
+++ b/spec/spec/svg.js
@@ -79,19 +79,4 @@ describe('SVG', function() {
     })
   })
   
-  describe('get()', function() {
-    it('gets an element\'s instance by id', function() {
-      var rect = draw.rect(111,333)
-      
-      expect(SVG.get(rect.attr('id'))).toBe(rect)
-    })
-    it('makes have all the element\'s methods available', function() {
-      var element = draw.group()
-        , got = SVG.get(element.attr('id'))
-      
-      expect(got.transform()).toEqual(SVG.defaults.trans())
-      expect(got.attr()).toEqual(element.attr())
-    })
-  })
-  
 })
\ No newline at end of file
diff --git a/spec/spec/symbol.js b/spec/spec/symbol.js
new file mode 100644
index 0000000..39a48db
--- /dev/null
+++ b/spec/spec/symbol.js
@@ -0,0 +1,16 @@
+describe('Symbol', function() {
+  var symbol
+
+  beforeEach(function() {
+    symbol = draw.symbol()
+  })
+
+  it('creates an instance of SVG.Symbol', function() {
+    expect(symbol instanceof SVG.Symbol).toBeTruthy()
+  })
+
+  it('creates symbol in defs', function() {
+    expect(symbol.parent instanceof SVG.Defs).toBeTruthy()
+  })
+
+})
\ No newline at end of file
diff --git a/spec/spec/text.js b/spec/spec/text.js
index 2e373a4..9574b4c 100755
--- a/spec/spec/text.js
+++ b/spec/spec/text.js
@@ -20,12 +20,12 @@ describe('Text', function() {
     it('sets the value of x with the first argument', function() {
       text.x(123)
       var box = text.bbox()
-      expect(box.x).toBe(123)
+      expect(approximately(box.x)).toBe(123)
     })
     it('sets the value of x based on the anchor with the first argument', function() {
       text.x(123, true)
       var box = text.bbox()
-      expect(box.x).toBe(123)
+      expect(approximately(box.x)).toBe(123)
     })
   })
   
@@ -50,17 +50,17 @@ describe('Text', function() {
   describe('cx()', function() {
     it('returns the value of cx without an argument', function() {
       var box = text.bbox()
-      expect(text.cx()).toBe(box.width / 2)
+      expect(approximately(text.cx())).toBe(approximately(box.width / 2))
     })
     it('sets the value of cx with the first argument', function() {
       text.cx(123)
       var box = text.bbox()
-      expect(box.cx).toBe(123)
+      expect(approximately(box.cx)).toBe(123)
     })
     it('sets the value of cx based on the anchor with the first argument', function() {
       text.cx(123, true)
       var box = text.bbox()
-      expect(box.cx).toBe(123)
+      expect(approximately(box.cx)).toBe(123)
     })
   })
   
@@ -80,8 +80,8 @@ describe('Text', function() {
     it('sets the x and y position', function() {
       text.move(123,456)
       var box = text.bbox()
-      expect(box.x).toBe(123)
-      expect(box.y).toBe(456)
+      expect(approximately(box.x)).toBe(123)
+      expect(approximately(box.y)).toBe(456)
     })
   })
   
@@ -89,8 +89,8 @@ describe('Text', function() {
     it('sets the cx and cy position', function() {
       text.center(321,567)
       var box = text.bbox()
-      expect(box.cx).toBe(321)
-      expect(Math.round(box.cy * 10) / 10).toBe(567)
+      expect(approximately(box.cx)).toBe(321)
+      expect(approximately(box.cy)).toBe(567)
     })
   })
   
@@ -199,8 +199,17 @@ describe('Text', function() {
     it('clears the stored content value', function() {
       text.text('Stored locally.')
       expect(text.content).toBe('Stored locally.')
-      text.clear()
-      expect(text.content).toBe('')
+    })
+  })
+
+  describe('length()', function() {
+    it('gets total length of text', function() {
+      text.text(function(add) {
+        add.tspan('The first.')
+        add.tspan('The second.')
+        add.tspan('The third.')
+      })
+      expect(text.length()).toBe(text.lines.get(0).length() + text.lines.get(1).length() + text.lines.get(2).length())
     })
   })
   
diff --git a/src/defs.js b/src/defs.js
index a50ad94..ad66cc5 100755
--- a/src/defs.js
+++ b/src/defs.js
@@ -5,4 +5,5 @@ SVG.Defs = SVG.invent({
 
   // Inherit from
 , inherit: SVG.Container
+  
 })
\ No newline at end of file
diff --git a/src/element.js b/src/element.js
index e63b57e..b12947b 100755
--- a/src/element.js
+++ b/src/element.js
@@ -61,10 +61,9 @@ SVG.Element = SVG.invent({
   , size: function(width, height) {
       var p = proportionalSize(this.bbox(), width, height)
 
-      return this.attr({
-        width:  new SVG.Number(p.width)
-      , height: new SVG.Number(p.height)
-      })
+      return this
+        .width(new SVG.Number(p.width))
+        .height(new SVG.Number(p.height))
     }
     // Clone element
   , clone: function() {
@@ -308,6 +307,10 @@ SVG.Element = SVG.invent({
       
       return this
     }
+    // Get / set id
+  , id: function(id) {
+      return this.attr('id', id)
+    }
     // Get bounding box
   , bbox: function() {
       return new SVG.BBox(this)
@@ -384,6 +387,10 @@ SVG.Element = SVG.invent({
       }
       return this
     }
+    // Get referenced element form attribute value
+  , reference: function(attr) {
+      return SVG.get(this.attr(attr))
+    }
     // Private: find svg parent by instance
   , _parent: function(parent) {
       var element = this
diff --git a/src/gradient.js b/src/gradient.js
index 895f8ca..56c1376 100755
--- a/src/gradient.js
+++ b/src/gradient.js
@@ -47,7 +47,7 @@ SVG.Gradient = SVG.invent({
     }
     // Return the fill id
   , fill: function() {
-      return 'url(#' + this.attr('id') + ')'
+      return 'url(#' + this.id() + ')'
     }
     // Alias string convertion to fill
   , toString: function() {
diff --git a/src/helpers.js b/src/helpers.js
index 5a1dd6d..c63c215 100644
--- a/src/helpers.js
+++ b/src/helpers.js
@@ -114,6 +114,13 @@ function parseMatrix(o) {
   return o
 }
 
+// Get id from reference string
+function idFromReference(url) {
+  var m = url.toString().match(SVG.regex.reference)
+
+  if (m) return m[1]
+}
+
 // Shim layer with setTimeout fallback by Paul Irish
 window.requestAnimFrame = (function(){
   return  window.requestAnimationFrame       ||
diff --git a/src/marker.js b/src/marker.js
new file mode 100644
index 0000000..30b09a4
--- /dev/null
+++ b/src/marker.js
@@ -0,0 +1,80 @@
+SVG.Marker = SVG.invent({
+  // Initialize node
+  create: 'marker'
+
+  // Inherit from
+, inherit: SVG.Container
+
+  // Add class methods
+, extend: {
+    // Set width of element
+    width: function(width) {
+      return this.attr('markerWidth', width)
+    }
+    // Set height of element
+  , height: function(height) {
+      return this.attr('markerHeight', height)
+    }
+    // Set marker refX and refY
+  , ref: function(x, y) {
+      return this.attr('refX', x).attr('refY', y)
+    }
+    // Update marker
+  , update: function(block) {
+      /* remove all content */
+      this.clear()
+      
+      /* invoke passed block */
+      if (typeof block == 'function')
+        block.call(this, this)
+      
+      return this
+    }
+    // Return the fill id
+  , toString: function() {
+      return 'url(#' + this.id() + ')'
+    }
+  }
+
+  // Add parent method
+, construct: {
+    marker: function(width, height, block) {
+      // Create marker element in defs
+      return this.defs().marker(width, height, block)
+    }
+  }
+
+})
+
+SVG.extend(SVG.Defs, {
+  // Create marker
+  marker: function(width, height, block) {
+    // Set default viewbox to match the width and height, set ref to cx and cy and set orient to auto
+    return this.put(new SVG.Marker)
+      .size(width, height)
+      .ref(width / 2, height / 2)
+      .viewbox(0, 0, width, height)
+      .attr('orient', 'auto')
+      .update(block)
+  }
+  
+})
+
+SVG.extend(SVG.Line, SVG.Polyline, SVG.Polygon, SVG.Path, {
+  // Create and attach markers
+  marker: function(marker, width, height, block) {
+    var attr = ['marker']
+
+    // Build attribute name
+    if (marker != 'all') attr.push(marker)
+    attr = attr.join('-')
+
+    // Set marker attribute
+    marker = arguments[1] instanceof SVG.Marker ?
+      arguments[1] :
+      this.doc().marker(width, height, block)
+    
+    return this.attr(attr, marker)
+  }
+  
+})
\ No newline at end of file
diff --git a/src/pattern.js b/src/pattern.js
index e5398d2..76190ef 100755
--- a/src/pattern.js
+++ b/src/pattern.js
@@ -9,7 +9,7 @@ SVG.Pattern = SVG.invent({
 , extend: {
     // Return the fill id
 	  fill: function() {
-	    return 'url(#' + this.attr('id') + ')'
+	    return 'url(#' + this.id() + ')'
 	  }
 	  // Update pattern by rebuilding
 	, update: function(block) {
diff --git a/src/regex.js b/src/regex.js
index 433952b..13f62d8 100755
--- a/src/regex.js
+++ b/src/regex.js
@@ -8,6 +8,9 @@ SVG.regex = {
   
   /* parse rgb value */
 , rgb:          /rgb\((\d+),(\d+),(\d+)\)/
+  
+  /* parse reference id */
+, reference:    /#([a-z0-9\-_]+)/i
 
   /* test hex value */
 , isHex:        /^#[a-f0-9]{3,6}$/i
diff --git a/src/selector.js b/src/selector.js
new file mode 100644
index 0000000..905e9f9
--- /dev/null
+++ b/src/selector.js
@@ -0,0 +1,5 @@
+// Method for getting an element by id
+SVG.get = function(id) {
+  var node = document.getElementById(idFromReference(id) || id)
+  if (node) return node.instance
+}
\ No newline at end of file
diff --git a/src/set.js b/src/set.js
index 38251f5..37246fe 100755
--- a/src/set.js
+++ b/src/set.js
@@ -52,6 +52,14 @@ SVG.Set = SVG.invent({
   , get: function(i) {
       return this.members[i]
     }
+    // Get first member
+  , first: function() {
+      return this.get(0)
+    }
+    // Get last member
+  , last: function() {
+      return this.get(this.members.length - 1)
+    }
     // Default value
   , valueOf: function() {
       return this.members
diff --git a/src/svg.js b/src/svg.js
index e0e5b44..eb0185d 100755
--- a/src/svg.js
+++ b/src/svg.js
@@ -55,12 +55,6 @@ SVG.extend = function() {
     SVG.Set.inherit()
 }
 
-// Method for getting an element by id
-SVG.get = function(id) {
-  var node = document.getElementById(id)
-  if (node) return node.instance
-}
-
 // Initialize parsing element
 SVG.prepare = function(element) {
   /* select document body and create invisible svg element */
diff --git a/src/symbol.js b/src/symbol.js
new file mode 100644
index 0000000..e8907a3
--- /dev/null
+++ b/src/symbol.js
@@ -0,0 +1,17 @@
+
+SVG.Symbol = SVG.invent({
+  // Initialize node
+  create: 'symbol'
+
+  // Inherit from
+, inherit: SVG.Container
+
+  // Add parent method
+, construct: {
+    // Create a new symbol
+    symbol: function() {
+      return this.defs().put(new SVG.Symbol)
+    }
+  }
+  
+})
\ No newline at end of file
diff --git a/src/text.js b/src/text.js
index 1d05362..1b6bd94 100755
--- a/src/text.js
+++ b/src/text.js
@@ -217,6 +217,10 @@ SVG.extend(SVG.Text, SVG.TSpan, {
     
     return this
   }
+  // Get length of text element
+, length: function() {
+    return this.node.getComputedTextLength()
+  }
 })
 
 // Register rebuild event