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SVG.ViewBox = SVG.invent({
create: function(source) {
var i, base = [0, 0, 0, 0]
var x, y, width, height, box, view, we, he
, wm = 1 // width multiplier
, hm = 1 // height multiplier
, reg = /[+-]?(?:\d+(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?/gi
if(source instanceof SVG.Element){
we = source
he = source
view = (source.attr('viewBox') || '').match(reg)
box = source.bbox
// get dimensions of current node
width = new SVG.Number(source.width())
height = new SVG.Number(source.height())
// find nearest non-percentual dimensions
while (width.unit == '%') {
wm *= width.value
width = new SVG.Number(we instanceof SVG.Doc ? we.parent().offsetWidth : we.parent().width())
we = we.parent()
}
while (height.unit == '%') {
hm *= height.value
height = new SVG.Number(he instanceof SVG.Doc ? he.parent().offsetHeight : he.parent().height())
he = he.parent()
}
// ensure defaults
this.x = 0
this.y = 0
this.width = width * wm
this.height = height * hm
this.zoom = 1
if (view) {
// get width and height from viewbox
x = parseFloat(view[0])
y = parseFloat(view[1])
width = parseFloat(view[2])
height = parseFloat(view[3])
// 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
}
}else{
// ensure source as object
source = typeof source === 'string' ?
source.match(reg).map(function(el){ return parseFloat(el) }) :
Array.isArray(source) ?
source :
typeof source == 'object' ?
[source.x, source.y, source.width, source.height] :
arguments.length == 4 ?
[].slice.call(arguments) :
base
this.x = source[0]
this.y = source[1]
this.width = source[2]
this.height = source[3]
}
}
, extend: {
toString: function() {
return this.x + ' ' + this.y + ' ' + this.width + ' ' + this.height
}
, morph: function(v){
var v = arguments.length == 1 ?
[v.x, v.y, v.width, v.height] :
[].slice.call(arguments)
this.destination = new SVG.ViewBox(v)
return this
}
, at: function(pos) {
if(!this.destination) return this
return new SVG.ViewBox([
this.x + (this.destination.x - this.x) * pos
, this.y + (this.destination.y - this.y) * pos
, this.width + (this.destination.width - this.width) * pos
, this.height + (this.destination.height - this.height) * pos
])
}
}
// Define parent
, parent: SVG.Container
// Add parent method
, construct: {
// get/set viewbox
viewbox: function(v) {
if (arguments.length == 0)
// act as a getter if there are no arguments
return new SVG.ViewBox(this)
// otherwise act as a setter
v = arguments.length == 1 ?
[v.x, v.y, v.width, v.height] :
[].slice.call(arguments)
return this.attr('viewBox', v)
}
}
})
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