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SVG.BBox = SVG.invent({
// Initialize
create: function(element) {
var box
// Initialize zero box
this.x = 0
this.y = 0
this.width = 0
this.height = 0
// Get values if element is given
if (element) {
// Get current extracted transformations
var t = new SVG.Matrix(element).extract()
// Find native bbox
if (element.node.getBBox)
box = element.node.getBBox()
// Mimic bbox
else
box = {
x: element.node.clientLeft
, y: element.node.clientTop
, width: element.node.clientWidth
, height: element.node.clientHeight
}
// Include translations on x an y
this.x = box.x + t.x
this.y = box.y + t.y
// Plain width and height
this.width = box.width * t.scaleX
this.height = box.height * t.scaleY
}
// 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.RBox = SVG.invent({
// Initialize
create: 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.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.x /= zoom
this.y /= zoom
this.width = box.width /= zoom
this.height = box.height /= zoom
// Offset by window scroll position, because getBoundingClientRect changes when window is scrolled
this.x += window.scrollX
this.y += window.scrollY
// Add center, right and bottom
fullBox(this)
}
// define Parent
, parent: SVG.Element
// Constructor
, construct: {
// Get rect box
rbox: function() {
return new SVG.RBox(this)
}
}
})
// Add universal merge method
;[SVG.BBox, 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 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
return fullBox(b)
}
})
})
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