added SVG.Box, added transform method to boxes, fix rbox (#626)

added SVG.Box, added transform method to boxes, fix rbox

Also:
- workaround for screenCTM with nested svg (FF bug)
- remove unneeded workaround in toParent()
- rbox accepts additional parameter to transform the box

10 files changed, 366 insertions, 275 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 74ac2dd..8d25672 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,8 @@ The document follows the conventions described in [“Keep a CHANGELOG”](http:
 - added a plot and array method to `SVG.TextPath` (#582)
 - added `clone()` method to `SVG.Array/PointArray/PathArray` (#590)
 - added `font()` method to `SVG.Tspan`
+- added `SVG.Box()`
+- added `transform()` method to boxes
 
 ### Changed
 - changed CHANGELOG to follow the conventions described in [“Keep a CHANGELOG”](http://keepachangelog.com) (#578)
@@ -44,6 +46,13 @@ The document follows the conventions described in [“Keep a CHANGELOG”](http:
 - relative value for `SVG.Number` are now calculated in its `morph` method (related #547)
 - clean up the implementation of the `initAnimation` method of the FX module (#547, #552, #584)
 - deprecated `.tbox()`. `.tbox()` now map to `.rbox()`. If you are using `.tbox()`, you can substitute it with `.rbox()` (#594, #602)
+- all boxes now accept 4 values or an object on creation
+- `el.rbox()` now always returns the right boxes in screen coordinates and has an additional paramater to transform the box into other coordinate systems
+
+### Fixed
+- fixed a bug in the plain morphing part of `SVG.MorphObj` that is in the FX module
+- fixed bug which produces an error when removing an event from a node which was formerly removed with a global `off()` (#518)
+- fixed a bug in `size()` for poly elements when their height/width is zero (#505)
 - viewbox now also accepts strings and arrays as constructor arguments
 - `SVG.Array` now accepts a comma seperated string and returns array of numbers instead of strings
 - `SVG.Matrix` now accepts an array as input
@@ -51,13 +60,6 @@ The document follows the conventions described in [“Keep a CHANGELOG”](http:
 - `dx()/dy()` now accepts percentage values, too but only if the value on the element is already percentage
 - `flip()` now flips on both axis when no parameter is passed
 
-### Fixed
-- fixed a bug in the plain morphing part of `SVG.MorphObj` that is in the FX module
-- fixed bug which produces an error when removing an event from a node which was formerly removed with a global `off()` (#518)
-- fixed a bug in `size()` for poly elements when their height/width is zero (#505)
-
-====
-
 
 ## [2.4.0] - 2017-01-14
 
diff --git a/dist/svg.js b/dist/svg.js
index 2736133..50d4479 100644
--- a/dist/svg.js
+++ b/dist/svg.js
@@ -6,7 +6,7 @@
 * @copyright Wout Fierens <wout@mick-wout.com>
 * @license MIT
 *
-* BUILT: Wed Mar 08 2017 09:43:24 GMT+0100 (Mitteleuropäische Zeit)
+* BUILT: Wed Mar 08 2017 14:22:41 GMT+0100 (Mitteleuropäische Zeit)
 */;
 (function(root, factory) {
   if (typeof define === 'function' && define.amd) {
@@ -2150,11 +2150,74 @@ SVG.extend(SVG.FX, {
   }
 })
 
+SVG.Box = SVG.invent({
+  create: function(x, y, width, height) {
+    if (typeof x == 'object' && !(x instanceof SVG.Element)) {
+      // chromes getBoundingClientRect has no x and y property
+      return SVG.Box.call(this, x.left || x.x, x.top || x.y, x.width, x.height)
+    } else if (arguments.length == 4) {
+      this.x = x
+      this.y = y
+      this.width = width
+      this.height = height
+
+    }
+
+    // add center, right, bottom...
+    fullBox(this)
+  }
+, extend: {
+    // Merge rect box with another, return a new instance
+    merge: function(box) {
+      var b = new this.constructor()
+
+      // merge boxes
+      b.x      = Math.min(this.x, box.x)
+      b.y      = Math.min(this.y, box.y)
+      b.width  = Math.max(this.x + this.width,  box.x + box.width)  - b.x
+      b.height = Math.max(this.y + this.height, box.y + box.height) - b.y
+
+      return fullBox(b)
+    }
+
+  , transform: function(m) {
+      var xMin = Infinity, xMax = -Infinity, yMin = Infinity, yMax = -Infinity, p
+
+      var pts = [
+        new SVG.Point(this.x, this.y),
+        new SVG.Point(this.x2, this.y),
+        new SVG.Point(this.x, this.y2),
+        new SVG.Point(this.x2, this.y2)
+      ]
+
+      pts.forEach(function(p) {
+        p = p.transform(m)
+        xMin = Math.min(xMin,p.x)
+        xMax = Math.max(xMax,p.x)
+        yMin = Math.min(yMin,p.y)
+        yMax = Math.max(yMax,p.y)
+      })
+
+      bbox = new this.constructor()
+      bbox.x = xMin
+      bbox.width = xMax-xMin
+      bbox.y = yMin
+      bbox.height = yMax-yMin
+
+      fullBox(bbox)
+
+      return bbox
+    }
+  }
+})
+
 SVG.BBox = SVG.invent({
   // Initialize
   create: function(element) {
+    SVG.Box.apply(this, [].slice.call(arguments))
+
     // get values if element is given
-    if (element) {
+    if (element instanceof SVG.Element) {
       var box
 
       // yes this is ugly, but Firefox can be a bitch when it comes to elements that are not yet rendered
@@ -2180,19 +2243,14 @@ SVG.BBox = SVG.invent({
         }
       }
 
-      // plain x and y
-      this.x = box.x
-      this.y = box.y
-
-      // plain width and height
-      this.width  = box.width
-      this.height = box.height
+      SVG.Box.call(this, box)
     }
 
-    // add center, right and bottom
-    fullBox(this)
   }
 
+  // Define ancestor
+, inherit: SVG.Box
+
   // Define Parent
 , parent: SVG.Element
 
@@ -2206,90 +2264,52 @@ SVG.BBox = SVG.invent({
 
 })
 
+SVG.BBox.prototype.constructor = SVG.BBox
+
+
 SVG.extend(SVG.Element, {
   tbox: function(){
     console.warn('Use of TBox is deprecated and mapped to RBox. Use .rbox() instead.')
-    return this.rbox()
+    return this.rbox(this.doc())
   }
 })
 
 SVG.RBox = SVG.invent({
   // Initialize
   create: function(element) {
-    if (element) {
-      var e    = element.doc().parent()
-        , box  = element.node.getBoundingClientRect()
-        , zoom = 1
-
-      // get screen offset
-      this.x = box.left
-      this.y = box.top
-
-      // subtract parent offset
-      this.x -= e.offsetLeft
-      this.y -= e.offsetTop
-
-      while (e = e.offsetParent) {
-        this.x -= e.offsetLeft
-        this.y -= e.offsetTop
-      }
+    SVG.Box.apply(this, [].slice.call(arguments))
 
-      // calculate cumulative zoom from svg documents
-      e = element
-      while (e.parent && (e = e.parent())) {
-        if (e.viewbox) {
-          zoom *= e.viewbox().zoom
-          this.x -= e.x() || 0
-          this.y -= e.y() || 0
-        }
-      }
-
-      // recalculate viewbox distortion
-      this.width  = box.width  /= zoom
-      this.height = box.height /= zoom
+    if (element instanceof SVG.Element) {
+      SVG.Box.call(this, element.node.getBoundingClientRect())
     }
-
-    // add center, right and bottom
-    fullBox(this)
-
-    // offset by window scroll position, because getBoundingClientRect changes when window is scrolled
-    this.x += window.pageXOffset
-    this.y += window.pageYOffset
   }
 
+, inherit: SVG.Box
+
   // define Parent
 , parent: SVG.Element
 
+, extend: {
+    addOffset: function() {
+      // offset by window scroll position, because getBoundingClientRect changes when window is scrolled
+      this.x += window.pageXOffset
+      this.y += window.pageYOffset
+      return this
+    }
+  }
+
   // Constructor
 , construct: {
     // Get rect box
-    rbox: function() {
-      return new SVG.RBox(this)
+    rbox: function(el) {
+      if (el) return new SVG.RBox(this).transform(el.screenCTM().inverse())
+      return new SVG.RBox(this).addOffset()
     }
   }
 
 })
 
-// Add universal merge method
-;[SVG.BBox, SVG.RBox].forEach(function(c) {
-
-  SVG.extend(c, {
-    // Merge rect box with another, return a new instance
-    merge: function(box) {
-      var b = new c()
-
-      // merge boxes
-      b.x      = Math.min(this.x, box.x)
-      b.y      = Math.min(this.y, box.y)
-      b.width  = Math.max(this.x + this.width,  box.x + box.width)  - b.x
-      b.height = Math.max(this.y + this.height, box.y + box.height) - b.y
-
-      return fullBox(b)
-    }
-
-  })
-
-})
+SVG.RBox.prototype.constructor = SVG.RBox
 
 SVG.Matrix = SVG.invent({
   // Initialize
@@ -2475,6 +2495,16 @@ SVG.Matrix = SVG.invent({
     },
     // Get current screen matrix
     screenCTM: function() {
+      /* https://bugzilla.mozilla.org/show_bug.cgi?id=1344537
+         This is needed because FF does not return the transformation matrix
+         for the inner coordinate system when getScreenCTM() is called on nested svgs.
+         However all other Browsers do that */
+      if(this instanceof SVG.Nested) {
+        var rect = this.rect(1,1)
+        var m = rect.node.getScreenCTM()
+        rect.remove()
+        return new SVG.Matrix(m)
+      }
       return new SVG.Matrix(this.node.getScreenCTM())
     }
 
@@ -2837,9 +2867,7 @@ SVG.extend(SVG.Element, {
   toParent: function(parent) {
     if(this == parent) return this
     var ctm = this.screenCTM()
-    var temp = parent.rect(1,1)
-    var pCtm = temp.screenCTM().inverse()
-    temp.remove()
+    var pCtm = parent.screenCTM().inverse()
 
     this.addTo(parent).untransform().transform(pCtm.multiply(ctm))
 
@@ -5035,25 +5063,19 @@ SVG.Set = SVG.invent({
     }
     // Get the bounding box of all members included or empty box if set has no items
   , bbox: function(){
-      var box = new SVG.BBox()
-
       // return an empty box of there are no members
       if (this.members.length == 0)
-        return box
+        return new SVG.RBox()
 
       // get the first rbox and update the target bbox
-      var rbox = this.members[0].rbox()
-      box.x      = rbox.x
-      box.y      = rbox.y
-      box.width  = rbox.width
-      box.height = rbox.height
+      var rbox = this.members[0].rbox(this.members[0].doc())
 
       this.each(function() {
         // user rbox for correct position and visual representation
-        box = box.merge(this.rbox())
+        rbox = rbox.merge(this.rbox(this.doc()))
       })
 
-      return box
+      return rbox
     }
   }
 
diff --git a/dist/svg.min.js b/dist/svg.min.js
index 0c14397..5fa271e 100644
--- a/dist/svg.min.js
+++ b/dist/svg.min.js
@@ -1,2 +1,3 @@
-/*! svg.js v2.4.0 MIT*/;!function(t,e){"function"==typeof define&&define.amd?define(function(){return e(t,t.document)}):"object"==typeof exports?module.exports=t.document?e(t,t.document):function(t){return e(t,t.document)}:t.SVG=e(t,t.document)}("undefined"!=typeof window?window:this,function(t,e){function i(t,e,i,n){return i+n.replace(w.regex.dots," .")}function n(t){for(var e=t.slice(0),i=e.length;i--;)Array.isArray(e[i])&&(e[i]=n(e[i]));return e}function r(t,e){return t instanceof e}function s(t,e){return(t.matches||t.matchesSelector||t.msMatchesSelector||t.mozMatchesSelector||t.webkitMatchesSelector||t.oMatchesSelector).call(t,e)}function a(t){return t.toLowerCase().replace(/-(.)/g,function(t,e){return e.toUpperCase()})}function o(t){return t.charAt(0).toUpperCase()+t.slice(1)}function h(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 u(t){var e=t.toString(16);return 1==e.length?"0"+e:e}function l(t,e,i){if(null==e||null==i){var n=t.bbox();null==e?e=n.width/n.height*i:null==i&&(i=n.height/n.width*e)}return{width:e,height:i}}function c(t,e,i){return{x:e*t.a+i*t.c+0,y:e*t.b+i*t.d+0}}function f(t){return{a:t[0],b:t[1],c:t[2],d:t[3],e:t[4],f:t[5]}}function d(t){return t instanceof w.Matrix||(t=new w.Matrix(t)),t}function p(t,e){t.cx=null==t.cx?e.bbox().cx:t.cx,t.cy=null==t.cy?e.bbox().cy:t.cy}function m(t){return t=t.replace(w.regex.whitespace,"").replace(w.regex.matrix,"").split(w.regex.matrixElements),f(w.utils.map(t,function(t){return parseFloat(t)}))}function x(t){for(var e=0,i=t.length,n="";e<i;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 y(t){for(var e=t.childNodes.length-1;e>=0;e--)t.childNodes[e]instanceof SVGElement&&y(t.childNodes[e]);return 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null==t?this.attr("x"):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){for(var t="",e=this.node.childNodes,i=0,n=e.length;i<n;++i)0!=i&&3!=e[i].nodeType&&1==w.adopt(e[i]).dom.newLined&&(t+="\n"),t+=e[i].textContent;return t}if(this.clear().build(!0),"function"==typeof t)t.call(this,this);else{t=t.split("\n");for(var i=0,r=t.length;i<r;i++)this.tspan(t[i]).newLine()}return this.build(!1).rebuild()},size:function(t){return this.attr("font-size",t).rebuild()},leading:function(t){return null==t?this.dom.leading:(this.dom.leading=new w.Number(t),this.rebuild())},lines:function(){var 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t=this.track();return t?t.array():null},plot:function(t){var e=this.track(),i=null;return e&&(i=e.plot(t)),null==t?i:this},track:function(){var t=this.textPath();if(t)return t.reference("href")},textPath:function(){if(this.node.firstChild&&"textPath"==this.node.firstChild.nodeName)return w.adopt(this.node.firstChild)}}}),w.Nested=w.invent({create:function(){this.constructor.call(this,w.create("svg")),this.style("overflow","visible")},inherit:w.Container,construct:{nested:function(){return this.put(new w.Nested)}}}),w.A=w.invent({create:"a",inherit:w.Container,extend:{to:function(t){return this.attr("href",t,w.xlink)},show:function(t){return this.attr("show",t,w.xlink)},target:function(t){return this.attr("target",t)}},construct:{link:function(t){return this.put(new w.A).to(t)}}}),w.extend(w.Element,{linkTo:function(t){var e=new w.A;return"function"==typeof t?t.call(e,e):e.to(t),this.parent().put(e).put(this)}}),w.Marker=w.invent({create:"marker",inherit:w.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)}}}),w.extend(w.Defs,{marker:function(t,e,i){return this.put(new w.Marker).size(t,e).ref(t/2,e/2).viewbox(0,0,t,e).attr("orient","auto").update(i)}}),w.extend(w.Line,w.Polyline,w.Polygon,w.Path,{marker:function(t,e,i,n){var r=["marker"];return"all"!=t&&r.push(t),r=r.join("-"),t=arguments[1]instanceof w.Marker?arguments[1]:this.doc().marker(e,i,n),this.attr(r,t)}});var b={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("undefined"==typeof i)return this;if("string"==typeof i||w.Color.isRgb(i)||i&&"function"==typeof i.fill)this.attr(t,i);else for(e=b[t].length-1;e>=0;e--)null!=i[b[t][e]]&&this.attr(b.prefix(t,b[t][e]),i[b[t][e]]);return this},w.extend(w.Element,w.FX,i)}),w.extend(w.Element,w.FX,{rotate:function(t,e,i){return this.transform({rotation:t,cx:e,cy:i})},skew:function(t,e,i,n){return 1==arguments.length||3==arguments.length?this.transform({skew:t,cx:e,cy:i}):this.transform({skewX:t,skewY:e,cx:i,cy:n})},scale:function(t,e,i,n){return 1==arguments.length||3==arguments.length?this.transform({scale:t,cx:e,cy:i}):this.transform({scaleX:t,scaleY:e,cx:i,cy:n})},translate:function(t,e){return this.transform({x:t,y:e})},flip:function(t,e){return e="number"==typeof t?t:e,this.transform({flip:t||"both",offset:e})},matrix:function(t){return this.attr("transform",new w.Matrix(6==arguments.length?[].slice.call(arguments):t))},opacity:function(t){return this.attr("opacity",t)},dx:function(t){return this.x(new w.Number(t).plus(this instanceof w.FX?0:this.x()),!0)},dy:function(t){return this.y(new w.Number(t).plus(this instanceof w.FX?0:this.y()),!0)},dmove:function(t,e){return this.dx(t).dy(e)}}),w.extend(w.Rect,w.Ellipse,w.Circle,w.Gradient,w.FX,{radius:function(t,e){var i=(this._target||this).type;return"radial"==i||"circle"==i?this.attr("r",new w.Number(t)):this.rx(t).ry(null==e?t:e)}}),w.extend(w.Path,{length:function(){return this.node.getTotalLength()},pointAt:function(t){return this.node.getPointAtLength(t)}}),w.extend(w.Parent,w.Text,w.Tspan,w.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}}),w.Set=w.invent({create:function(t){Array.isArray(t)?this.members=t:this.clear()},extend:{add:function(){var t,e,i=[].slice.call(arguments);for(t=0,e=i.length;t<e;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;e<i;e++)t.apply(this.members[e],[e,this.members]);return this},clear:function(){return this.members=[],this},length:function(){return this.members.length},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(){if(0==this.members.length)return new w.RBox;var t=this.members[0].rbox(this.members[0].doc());return this.each(function(){t=t.merge(this.rbox(this.doc()))}),t}},construct:{set:function(t){return new w.Set(t)}}}),w.FX.Set=w.invent({create:function(t){this.set=t}}),w.Set.inherit=function(){var t,e=[];for(var t in w.Shape.prototype)"function"==typeof w.Shape.prototype[t]&&"function"!=typeof w.Set.prototype[t]&&e.push(t);e.forEach(function(t){w.Set.prototype[t]=function(){for(var e=0,i=this.members.length;e<i;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 w.FX.Set(this)):this}}),e=[];for(var t in w.FX.prototype)"function"==typeof w.FX.prototype[t]&&"function"!=typeof w.FX.Set.prototype[t]&&e.push(t);e.forEach(function(t){w.FX.Set.prototype[t]=function(){for(var e=0,i=this.set.members.length;e<i;e++)this.set.members[e].fx[t].apply(this.set.members[e].fx,arguments);return this}})},w.extend(w.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(e){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}}),w.extend(w.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={})}}),w.get=function(t){var i=e.getElementById(g(t)||t);return w.adopt(i)},w.select=function(t,i){return new w.Set(w.utils.map((i||e).querySelectorAll(t),function(t){return w.adopt(t)}))},w.extend(w.Parent,{select:function(t){return w.select(t,this.node)}});var C="abcdef".split("");if("function"!=typeof N){var N=function(t,i){i=i||{bubbles:!1,cancelable:!1,detail:void 0};var n=e.createEvent("CustomEvent");return n.initCustomEvent(t,i.bubbles,i.cancelable,i.detail),n};N.prototype=t.Event.prototype,t.CustomEvent=N}return function(e){for(var i=0,n=["moz","webkit"],r=0;r<n.length&&!t.requestAnimationFrame;++r)e.requestAnimationFrame=e[n[r]+"RequestAnimationFrame"],e.cancelAnimationFrame=e[n[r]+"CancelAnimationFrame"]||e[n[r]+"CancelRequestAnimationFrame"];
+e.requestAnimationFrame=e.requestAnimationFrame||function(t){var n=(new Date).getTime(),r=Math.max(0,16-(n-i)),s=e.setTimeout(function(){t(n+r)},r);return i=n+r,s},e.cancelAnimationFrame=e.cancelAnimationFrame||e.clearTimeout}(t),w});
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diff --git a/spec/spec/boxes.js b/spec/spec/boxes.js
index 47a9d9e..9e9fc73 100644
--- a/spec/spec/boxes.js
+++ b/spec/spec/boxes.js
@@ -1,42 +1,96 @@
-describe('BBox', function() {
+describe('Box', function() {
+  it('creates a new instance without passing anything', function() {
+    var box = new SVG.Box
+
+    expect(box instanceof SVG.Box).toBe(true)
+    expect(box).toEqual(jasmine.objectContaining({
+      x:0, y:0, cx:0, cy:0, width:0, height:0
+    }))
+  })
 
-  afterEach(function() {
-    draw.clear()
+  it('creates a new instance with 4 arguments given', function() {
+    var box = new SVG.Box(10, 20, 100, 50)
+
+    expect(box instanceof SVG.Box).toBe(true)
+    expect(box).toEqual(jasmine.objectContaining({
+      x:10, y:20, cx:60, cy:45, width:100, height:50
+    }))
   })
 
-  it('creates a new instance without passing an element', function() {
-    var box = new SVG.BBox
-    expect(box.x).toBe(0)
-    expect(box.y).toBe(0)
-    expect(box.cx).toBe(0)
-    expect(box.cy).toBe(0)
-    expect(box.width).toBe(0)
-    expect(box.height).toBe(0)
+  it('creates a new instance with object given', function() {
+    var box = new SVG.Box({x:10, y:20, width: 100, height:50})
+
+    expect(box instanceof SVG.Box).toBe(true)
+    expect(box).toEqual(jasmine.objectContaining({
+      x:10, y:20, cx:60, cy:45, width:100, height:50
+    }))
   })
 
   describe('merge()', function() {
     it('merges various bounding boxes', function() {
-      var box1 = draw.rect(100,100).move(50,50).bbox()
-      var box2 = draw.rect(100,100).move(300,400).bbox()
-      var box3 = draw.rect(100,100).move(500,100).bbox()
+      var box1 = new SVG.Box(50, 50, 100, 100)
+      var box2 = new SVG.Box(300, 400, 100, 100)
+      var box3 = new SVG.Box(500, 100, 100, 100)
       var merged = box1.merge(box2).merge(box3)
-      expect(merged.x).toBe(50)
-      expect(merged.y).toBe(50)
-      expect(merged.cx).toBe(325)
-      expect(merged.cy).toBe(275)
-      expect(merged.width).toBe(550)
-      expect(merged.height).toBe(450)
+      
+      expect(merged).toEqual(jasmine.objectContaining({
+        x: 50, y: 50, cx: 325, cy: 275, width: 550, height: 450
+      }))
     })
-    it('returns a new bbox instance', function() {
-      var box1 = draw.rect(100,100).move(50,50).bbox()
-      var box2 = draw.rect(100,100).move(300,400).bbox()
+    it('returns a new instance', function() {
+      var box1 = new SVG.Box(50, 50, 100, 100)
+      var box2 = new SVG.Box(300, 400, 100, 100)
       var merged = box1.merge(box2)
       expect(box1).not.toBe(merged)
       expect(box2).not.toBe(merged)
-      expect(box1.x).toBe(50)
-      expect(box1.y).toBe(50)
-      expect(box2.x).toBe(300)
-      expect(box2.y).toBe(400)
+      
+      expect(merged instanceof SVG.Box).toBe(true)
+    })
+  })
+  
+  describe('transform()', function() {
+    it('transforms the box with given matrix', function() {
+      var box1 = new SVG.Box(50, 50, 100, 100).transform(new SVG.Matrix(1,0,0,1,20,20))
+      var box2 = new SVG.Box(50, 50, 100, 100).transform(new SVG.Matrix(2,0,0,2,0,0))
+      var box3 = new SVG.Box(-200, -200, 100, 100).transform(new SVG.Matrix(1,0,0,1,-20,-20))
+      
+      expect(box1).toEqual(jasmine.objectContaining({
+        x: 70, y: 70, cx: 120, cy: 120, width: 100, height: 100
+      }))
+      
+      expect(box2).toEqual(jasmine.objectContaining({
+        x: 100, y: 100, cx: 200, cy: 200, width: 200, height: 200
+      }))
+      
+      expect(box3).toEqual(jasmine.objectContaining({
+        x: -220, y: -220, cx: -170, cy: -170, width: 100, height: 100
+      }))
+    })
+  })
+})
+
+describe('BBox', function() {
+
+  afterEach(function() {
+    draw.clear()
+  })
+
+  it('creates a new instance from an element', function() {
+    var rect = draw.rect(100, 100).move(100, 25)
+    var box = new SVG.BBox(rect)
+
+    expect(box).toEqual(jasmine.objectContaining({
+      x: 100, y: 25, cx: 150, cy: 75, width: 100, height: 100
+    }))
+  })
+  
+  describe('merge()', function() {
+    it('returns an instance of SVG.BBox', function() {
+      var box1 = new SVG.BBox(50, 50, 100, 100)
+      var box2 = new SVG.BBox(300, 400, 100, 100)
+      var merged = box1.merge(box2)
+      
+      expect(merged instanceof SVG.BBox).toBe(true)
     })
   })
 
@@ -74,52 +128,36 @@ describe('RBox', function() {
     draw.clear()
   })
 
-  it('creates a new instance without passing an element', function() {
-    var box = new SVG.RBox
-    expect(box.x).toBe(0)
-    expect(box.y).toBe(0)
-    expect(box.cx).toBe(0)
-    expect(box.cy).toBe(0)
-    expect(box.width).toBe(0)
-    expect(box.height).toBe(0)
+  it('creates a new instance from an element', function() {
+    var rect = draw.rect(100, 100).move(100, 25)
+    var box = new SVG.RBox(rect).transform(rect.doc().screenCTM().inverse()).addOffset()
+    expect(box).toEqual(jasmine.objectContaining({
+      x: 100, y: 25, cx: 150, cy: 75, width: 100, height: 100
+    }))
   })
-
+  
   describe('merge()', function() {
-    it('merges various bounding boxes', function() {
-      var box1 = draw.rect(100,100).move(50,50).bbox()
-      var box2 = draw.rect(100,100).move(300,400).bbox()
-      var box3 = draw.rect(100,100).move(500,100).bbox()
-      var merged = box1.merge(box2).merge(box3)
-      expect(merged.x).toBe(50)
-      expect(merged.y).toBe(50)
-      expect(merged.cx).toBe(325)
-      expect(merged.cy).toBe(275)
-      expect(merged.width).toBe(550)
-      expect(merged.height).toBe(450)
-    })
-    it('returns a new bbox instance', function() {
-      var box1 = draw.rect(100,100).move(50,50).bbox()
-      var box2 = draw.rect(100,100).move(300,400).bbox()
+    it('returns an instance of SVG.RBox', function() {
+      var box1 = new SVG.RBox(50, 50, 100, 100)
+      var box2 = new SVG.RBox(300, 400, 100, 100)
       var merged = box1.merge(box2)
-      expect(box1).not.toBe(merged)
-      expect(box2).not.toBe(merged)
-      expect(box1.x).toBe(50)
-      expect(box1.y).toBe(50)
-      expect(box2.x).toBe(300)
-      expect(box2.y).toBe(400)
+      
+      expect(merged instanceof SVG.RBox).toBe(true)
     })
   })
-
 })
 
 describe('Boxes', function() {
-  var rect
+  var rect, nested, offset
 
   beforeEach(function() {
-    rect = draw.rect(50, 180).move(25, 90).scale(2, 3, 25, 90).translate(10, 11)
+    offset = draw.screenCTM()
+    draw.viewbox(100,100, 200, 200)
+    nested = draw.nested().size(200, 200).move(100,100).viewbox(0, 0, 100, 100)
+    rect = nested.rect(50, 180).move(25, 90).scale(2, 0, 0).transform({x:10, y:10}, true)
   })
   afterEach(function() {
-    draw.clear()
+    draw.clear().attr('viewBox', null)
   })
 
   describe('bbox()', function() {
@@ -128,25 +166,29 @@ describe('Boxes', function() {
     })
     it('matches the size of the target element, ignoring transformations', function() {
       var box = rect.bbox()
-      expect(box.x).toBe(25)
-      expect(box.y).toBe(90)
-      expect(box.cx).toBe(50)
-      expect(box.cy).toBe(180)
-      expect(box.width).toBe(50)
-      expect(box.height).toBe(180)
-      expect(box.w).toBe(50)
-      expect(box.h).toBe(180)
-      expect(box.x2).toBe(75)
-      expect(box.y2).toBe(270)
+
+      expect(box).toEqual(jasmine.objectContaining({
+        x: 25, y: 90, cx: 50, cy: 180, width: 50, height: 180
+      }))
     })
     it('returns a box even if the element is not in the dom', function() {
       var line = new SVG.Line().plot(0, 0, 50, 50)
       var box = line.bbox()
 
-      expect(box.x).toBe(0)
-      expect(box.y).toBe(0)
-      expect(box.width).toBe(50)
-      expect(box.height).toBe(50)
+      expect(box).toEqual(jasmine.objectContaining({
+        x: 0, y: 0, width: 50, height: 50
+      }))
+
+      expect('Should not result into infinite loop').toBe('Should not result into infinite loop')
+    })
+    it('returns a box even if the element is not in the dom and invisible', function() {
+      var line = new SVG.Line().plot(0, 0, 50, 50).hide()
+      var box = line.bbox()
+
+      expect(box).toEqual(jasmine.objectContaining({
+        x: 0, y: 0, width: 50, height: 50
+      }))
+
       expect('Should not result into infinite loop').toBe('Should not result into infinite loop')
     })
   })
@@ -155,18 +197,30 @@ describe('Boxes', function() {
     it('returns an instance of SVG.RBox', function() {
       expect(rect.rbox() instanceof SVG.RBox).toBeTruthy()
     })
-    it('matches the size of the target element, including transformations', function() {
+
+    it('returns the elements box in absolute screen coordinates by default', function() {
       var box = rect.rbox()
-      expect(box.x).toBeCloseTo(60)
-      expect(box.y).toBeCloseTo(281, 0)
-      expect(box.cx).toBeCloseTo(110)
-      expect(box.cy).toBeCloseTo(551, 0)
-      expect(box.width).toBe(100)
-      expect(box.height).toBe(540)
-      expect(box.w).toBe(100)
-      expect(box.h).toBe(540)
-      expect(box.x2).toBeCloseTo(160)
-      expect(box.y2).toBeCloseTo(821, 0)
+
+      expect(box).toEqual(jasmine.objectContaining({
+        x: 70 + offset.e, y: 200 + offset.f, width: 100, height: 360
+      }))
+
+    })
+
+    it('returns the elements box in coordinates of given element (doc)', function() {
+      var box = rect.rbox(draw)
+
+      expect(box).toEqual(jasmine.objectContaining({
+        x: 240, y: 500, width: 200, height: 720
+      }))
+    })
+
+    it('returns the elements box in coordinates of given element (nested)', function() {
+      var box = rect.rbox(nested)
+
+      expect(box).toEqual(jasmine.objectContaining({
+        x: 70, y: 200, width: 100, height: 360
+      }))
     })
   })
 
diff --git a/spec/spec/element.js b/spec/spec/element.js
index e05f596..98d5211 100644
--- a/spec/spec/element.js
+++ b/spec/spec/element.js
@@ -585,7 +585,7 @@ describe('Element', function() {
     })
     it('returns the correct rectangular box', function() {
       var rect = draw.size(200, 150).viewbox(0, 0, 200, 150).rect(105, 210).move(2, 12)
-      var box = rect.rbox()
+      var box = rect.rbox(draw)
       expect(box.x).toBeCloseTo(2, 0)
       expect(box.y).toBeCloseTo(12, 0)
       expect(box.cx).toBeCloseTo(54.5)
@@ -593,16 +593,6 @@ describe('Element', function() {
       expect(box.width).toBe(105)
       expect(box.height).toBe(210)
     })
-    it('returns the correct rectangular box within a viewbox', function() {
-      var rect = draw.size(200,150).viewbox(0,0,100,75).rect(105,210).move(2,12)
-      var box = rect.rbox()
-      expect(box.x).toBeCloseTo(4)
-      expect(box.y).toBeCloseTo(24, 0)
-      expect(box.cx).toBeCloseTo(56.5)
-      expect(box.cy).toBeCloseTo(129, 0)
-      expect(box.width).toBe(105)
-      expect(box.height).toBe(210)
-    })
   })
 
   describe('doc()', function() {
diff --git a/spec/spec/set.js b/spec/spec/set.js
index 0fe7f43..50c3126 100644
--- a/spec/spec/set.js
+++ b/spec/spec/set.js
@@ -144,10 +144,10 @@ describe('Set', function() {
       expect(box.width).toBeCloseTo(300)
       expect(box.height).toBeCloseTo(350)
     })
-    it('returns an instance of SVG.BBox', function() {
+    it('returns an instance of SVG.RBox', function() {
       set.add(e1).add(e2).add(e3).add(e4).add(e5)
 
-      expect(set.bbox() instanceof SVG.BBox).toBeTruthy()
+      expect(set.bbox() instanceof SVG.RBox).toBeTruthy()
     })
     it('returns an empty bounding box wiht no members', function() {
       var box = set.bbox()
diff --git a/src/boxes.js b/src/boxes.js
index 4198ea1..9d2ef04 100644
--- a/src/boxes.js
+++ b/src/boxes.js
@@ -1,8 +1,71 @@
+SVG.Box = SVG.invent({
+  create: function(x, y, width, height) {
+    if (typeof x == 'object' && !(x instanceof SVG.Element)) {
+      // chromes getBoundingClientRect has no x and y property
+      return SVG.Box.call(this, x.left || x.x, x.top || x.y, x.width, x.height)
+    } else if (arguments.length == 4) {
+      this.x = x
+      this.y = y
+      this.width = width
+      this.height = height
+
+    }
+
+    // add center, right, bottom...
+    fullBox(this)
+  }
+, extend: {
+    // Merge rect box with another, return a new instance
+    merge: function(box) {
+      var b = new this.constructor()
+
+      // merge boxes
+      b.x      = Math.min(this.x, box.x)
+      b.y      = Math.min(this.y, box.y)
+      b.width  = Math.max(this.x + this.width,  box.x + box.width)  - b.x
+      b.height = Math.max(this.y + this.height, box.y + box.height) - b.y
+
+      return fullBox(b)
+    }
+
+  , transform: function(m) {
+      var xMin = Infinity, xMax = -Infinity, yMin = Infinity, yMax = -Infinity, p
+
+      var pts = [
+        new SVG.Point(this.x, this.y),
+        new SVG.Point(this.x2, this.y),
+        new SVG.Point(this.x, this.y2),
+        new SVG.Point(this.x2, this.y2)
+      ]
+
+      pts.forEach(function(p) {
+        p = p.transform(m)
+        xMin = Math.min(xMin,p.x)
+        xMax = Math.max(xMax,p.x)
+        yMin = Math.min(yMin,p.y)
+        yMax = Math.max(yMax,p.y)
+      })
+
+      bbox = new this.constructor()
+      bbox.x = xMin
+      bbox.width = xMax-xMin
+      bbox.y = yMin
+      bbox.height = yMax-yMin
+
+      fullBox(bbox)
+
+      return bbox
+    }
+  }
+})
+
 SVG.BBox = SVG.invent({
   // Initialize
   create: function(element) {
+    SVG.Box.apply(this, [].slice.call(arguments))
+
     // get values if element is given
-    if (element) {
+    if (element instanceof SVG.Element) {
       var box
 
       // yes this is ugly, but Firefox can be a bitch when it comes to elements that are not yet rendered
@@ -28,19 +91,14 @@ SVG.BBox = SVG.invent({
         }
       }
 
-      // plain x and y
-      this.x = box.x
-      this.y = box.y
-
-      // plain width and height
-      this.width  = box.width
-      this.height = box.height
+      SVG.Box.call(this, box)
     }
 
-    // add center, right and bottom
-    fullBox(this)
   }
 
+  // Define ancestor
+, inherit: SVG.Box
+
   // Define Parent
 , parent: SVG.Element
 
@@ -54,87 +112,49 @@ SVG.BBox = SVG.invent({
 
 })
 
+SVG.BBox.prototype.constructor = SVG.BBox
+
+
 SVG.extend(SVG.Element, {
   tbox: function(){
     console.warn('Use of TBox is deprecated and mapped to RBox. Use .rbox() instead.')
-    return this.rbox()
+    return this.rbox(this.doc())
   }
 })
 
 SVG.RBox = SVG.invent({
   // Initialize
   create: function(element) {
-    if (element) {
-      var e    = element.doc().parent()
-        , box  = element.node.getBoundingClientRect()
-        , zoom = 1
-
-      // get screen offset
-      this.x = box.left
-      this.y = box.top
-
-      // subtract parent offset
-      this.x -= e.offsetLeft
-      this.y -= e.offsetTop
-
-      while (e = e.offsetParent) {
-        this.x -= e.offsetLeft
-        this.y -= e.offsetTop
-      }
-
-      // calculate cumulative zoom from svg documents
-      e = element
-      while (e.parent && (e = e.parent())) {
-        if (e.viewbox) {
-          zoom *= e.viewbox().zoom
-          this.x -= e.x() || 0
-          this.y -= e.y() || 0
-        }
-      }
+    SVG.Box.apply(this, [].slice.call(arguments))
 
-      // recalculate viewbox distortion
-      this.width  = box.width  /= zoom
-      this.height = box.height /= zoom
+    if (element instanceof SVG.Element) {
+      SVG.Box.call(this, element.node.getBoundingClientRect())
     }
-
-    // add center, right and bottom
-    fullBox(this)
-
-    // offset by window scroll position, because getBoundingClientRect changes when window is scrolled
-    this.x += window.pageXOffset
-    this.y += window.pageYOffset
   }
 
+, inherit: SVG.Box
+
   // define Parent
 , parent: SVG.Element
 
+, extend: {
+    addOffset: function() {
+      // offset by window scroll position, because getBoundingClientRect changes when window is scrolled
+      this.x += window.pageXOffset
+      this.y += window.pageYOffset
+      return this
+    }
+  }
+
   // Constructor
 , construct: {
     // Get rect box
-    rbox: function() {
-      return new SVG.RBox(this)
+    rbox: function(el) {
+      if (el) return new SVG.RBox(this).transform(el.screenCTM().inverse())
+      return new SVG.RBox(this).addOffset()
     }
   }
 
 })
 
-// Add universal merge method
-;[SVG.BBox, SVG.RBox].forEach(function(c) {
-
-  SVG.extend(c, {
-    // Merge rect box with another, return a new instance
-    merge: function(box) {
-      var b = new c()
-
-      // merge boxes
-      b.x      = Math.min(this.x, box.x)
-      b.y      = Math.min(this.y, box.y)
-      b.width  = Math.max(this.x + this.width,  box.x + box.width)  - b.x
-      b.height = Math.max(this.y + this.height, box.y + box.height) - b.y
-
-      return fullBox(b)
-    }
-
-  })
-
-})
+SVG.RBox.prototype.constructor = SVG.RBox
diff --git a/src/matrix.js b/src/matrix.js
index c040b7a..60f3531 100644
--- a/src/matrix.js
+++ b/src/matrix.js
@@ -182,6 +182,16 @@ SVG.Matrix = SVG.invent({
     },
     // Get current screen matrix
     screenCTM: function() {
+      /* https://bugzilla.mozilla.org/show_bug.cgi?id=1344537
+         This is needed because FF does not return the transformation matrix
+         for the inner coordinate system when getScreenCTM() is called on nested svgs.
+         However all other Browsers do that */
+      if(this instanceof SVG.Nested) {
+        var rect = this.rect(1,1)
+        var m = rect.node.getScreenCTM()
+        rect.remove()
+        return new SVG.Matrix(m)
+      }
       return new SVG.Matrix(this.node.getScreenCTM())
     }
 
diff --git a/src/set.js b/src/set.js
index 41289dd..9da52c7 100644
--- a/src/set.js
+++ b/src/set.js
@@ -70,25 +70,19 @@ SVG.Set = SVG.invent({
     }
     // Get the bounding box of all members included or empty box if set has no items
   , bbox: function(){
-      var box = new SVG.BBox()
-
       // return an empty box of there are no members
       if (this.members.length == 0)
-        return box
+        return new SVG.RBox()
 
       // get the first rbox and update the target bbox
-      var rbox = this.members[0].rbox()
-      box.x      = rbox.x
-      box.y      = rbox.y
-      box.width  = rbox.width
-      box.height = rbox.height
+      var rbox = this.members[0].rbox(this.members[0].doc())
 
       this.each(function() {
         // user rbox for correct position and visual representation
-        box = box.merge(this.rbox())
+        rbox = rbox.merge(this.rbox(this.doc()))
       })
 
-      return box
+      return rbox
     }
   }
   
diff --git a/src/transform.js b/src/transform.js
index e686ce4..d1db74a 100644
--- a/src/transform.js
+++ b/src/transform.js
@@ -201,9 +201,7 @@ SVG.extend(SVG.Element, {
   toParent: function(parent) {
     if(this == parent) return this
     var ctm = this.screenCTM()
-    var temp = parent.rect(1,1)
-    var pCtm = temp.screenCTM().inverse()
-    temp.remove()
+    var pCtm = parent.screenCTM().inverse()
 
     this.addTo(parent).untransform().transform(pCtm.multiply(ctm))