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/*! svg.screenbbox.js - v0.1.1 - 2015-11-08
* Copyright (c) 2015 Ulrich-Matthias Schäfer; Licensed MIT */
;(function () {
SVG.extend(SVG.Polyline, SVG.Polygon, SVG.Path, {
screenBBox: function(){
var i, transP
, arr = this.array().valueOf().slice() // path/point array
, len = arr.length // length of array, we need it later
, p = this.doc().node.createSVGPoint() // instance of SVGPoint
, m = this.screenCTM().native() // matrix for transfomation
, pos = [,0,0] // default position (for V and H in Path)
, transformPoints = function(arr){ // function to transform all points in arr
// loop trough all coordinates and transform them by reference
for(var i = 1, len = arr.length; i < len; i+=2){
p.x = arr[i]
p.y = arr[i+1]
// transP is later used to get the last computed value
transP = p.matrixTransform(m)
arr[i] = transP.x
arr[i+1] = transP.y
}
}
// kill all refereces to get a clean clone of the array
for(i = 0; i < len; ++i){
arr[i] = arr[i].slice()
}
// in case of polygon or polyline we need to normalize it to a path
if(this instanceof SVG.Polygon || this instanceof SVG.Polyline){
// just add the L
while(i--){
arr[i].unshift('L')
}
// first has to be M
arr[0][0] = 'M'
}
// in case of polygon close the path accordingly
if(this instanceof SVG.Polygon){
arr.push(['z'])
}
// loop through path array and transform all points
for(i = 0; i < len; ++i){
// get path segment
var s = arr[i][0]
// coordinate list
if (s == 'M' || s == 'L' || s == 'C' || s == 'S' || s == 'Q' || s == 'T'){
pos = [,arr[i][1], arr[i][2]]
transformPoints(arr[i])
// We have to transform it to Line cause vertical and horiz0ntal lines could be rotated
}else if (s == 'H' || s == 'V'){
pos[s == 'H' ? 1 : 2] = arr[i][1]
transformPoints(pos.slice())
arr[i][0] = 'L'
arr[i][1] = transP.x
arr[i][2] = transP.y
// position is the last one in arc
}else if (s == 'A'){
pos = [,arr[i][6], arr[i][7]]
transformPoints(pos.slice())
arr[i][6] = transP.x
arr[i][7] = transP.y
}
}
// return bbox of created path array
return (new SVG.PathArray(arr)).bbox()
}
})
}).call(this);