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// Get the rectangular box of a given element
SVG.RBox = function(element) {
var e, zoom
, box = {}
/* initialize zero box */
this.x = 0
this.y = 0
this.width = 0
this.height = 0
if (element) {
e = element.doc().parent
zoom = element.doc().viewbox().zoom
/* actual, native bounding box */
box = element.node.getBoundingClientRect()
/* 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 = e.parent) {
if (e.type == 'svg' && e.viewbox) {
zoom *= e.viewbox().zoom
this.x -= e.x() || 0
this.y -= e.y() || 0
}
}
}
/* recalculate viewbox distortion */
this.x /= zoom
this.y /= zoom
this.width = box.width /= zoom
this.height = box.height /= zoom
/* add the center */
this.cx = this.x + this.width / 2
this.cy = this.y + this.height / 2
}
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