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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
}
//
SVG.extend(SVG.RBox, {
// merge rect box with another, return a new instance
merge: function(box) {
var b = new SVG.RBox()
/* merge box */
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
/* add the center */
b.cx = b.x + b.width / 2
b.cy = b.y + b.height / 2
return b
}
})
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