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SVG.BBox = SVG.invent({
// Initialize
create: function(element) {
// get values if element is given
if (element) {
var box
// yes this is ugly, but Firefox can be a bitch when it comes to elements that are not yet rendered
try {
// find native bbox
box = element.node.getBBox()
} catch(e) {
// mimic bbox
box = {
x: element.node.clientLeft
, y: element.node.clientTop
, width: element.node.clientWidth
, height: element.node.clientHeight
}
}
// plain x and y
this.x = box.x
this.y = box.y
// plain width and height
this.width = box.width
this.height = box.height
}
// add center, right and bottom
fullBox(this)
}
// Define Parent
, parent: SVG.Element
// Constructor
, construct: {
// Get bounding box
bbox: function() {
return new SVG.BBox(this)
}
}
})
SVG.TBox = SVG.invent({
// Initialize
create: function(element) {
// get values if element is given
if (element) {
var t = element.ctm().extract()
, box = element.bbox()
// width and height including transformations
this.width = box.width * t.scaleX
this.height = box.height * t.scaleY
// x and y including transformations
this.x = box.x + t.x
this.y = box.y + t.y
}
// add center, right and bottom
fullBox(this)
}
// Define Parent
, parent: SVG.Element
// Constructor
, construct: {
// Get transformed bounding box
tbox: function() {
return new SVG.TBox(this)
}
}
})
SVG.RBox = SVG.invent({
// Initialize
create: function(element) {
if (element) {
var e = element.doc().parent()
, box = element.node.getBoundingClientRect()
, zoom = 1
// 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.parent && (e = e.parent())) {
if (e.viewbox) {
zoom *= e.viewbox().zoom
this.x -= e.x() || 0
this.y -= e.y() || 0
}
}
// recalculate viewbox distortion
this.width = box.width /= zoom
this.height = box.height /= zoom
}
// add center, right and bottom
fullBox(this)
// offset by window scroll position, because getBoundingClientRect changes when window is scrolled
this.x += window.scrollX
this.y += window.scrollY
}
// define Parent
, parent: SVG.Element
// Constructor
, construct: {
// Get rect box
rbox: function() {
return new SVG.RBox(this)
}
}
})
// Add universal merge method
;[SVG.BBox, SVG.TBox, SVG.RBox].forEach(function(c) {
SVG.extend(c, {
// Merge rect box with another, return a new instance
merge: function(box) {
var b = new c()
// merge boxes
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
return fullBox(b)
}
})
})
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