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SVG.ViewBox = function(element) {
var x, y, width, height
, box = element.bbox()
, view = (element.attr('viewBox') || '').match(/[\d\.]+/g)
/* clone attributes */
this.x = box.x
this.y = box.y
this.width = element.node.offsetWidth || element.attr('width')
this.height = element.node.offsetHeight || element.attr('height')
if (view) {
/* get width and height from viewbox */
x = parseFloat(view[0])
y = parseFloat(view[1])
width = parseFloat(view[2]) - x
height = parseFloat(view[3]) - y
/* calculate zoom accoring to viewbox */
this.zoom = ((this.width / this.height) > (width / height)) ?
this.height / height :
this.width / width
/* calculate real pixel dimensions on parent SVG.Doc element */
this.x = x
this.y = y
this.width = width
this.height = height
}
/* ensure a default zoom value */
this.zoom = this.zoom || 1
}
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