How to get the bounds of *all* elements on your Raphaël paper

raphael-element-bounds.coffee

# I'm pretty sure there isn't a built-in way of doing this;
# the below is one (simple) way...

# This assumes `paper` is your Raphael paper
getElementsBounds = ->
    bottom   = paper.bottom
    elements = []

    while bottom
        elements.push bottom
        bottom = bottom.next

    minX      = Number.MAX_VALUE
    minY      = Number.MAX_VALUE
    maxWidth  = 0
    maxHeight = 0

    for elem in elements
        bb = elem.getBBox()

        minX      = Math.min minX, bb.x
        minY      = Math.min minY, bb.y
        maxWidth  = Math.max maxWidth,  (bb.x + bb.width)
        maxHeight = Math.max maxHeight, (bb.y + bb.height)

    x      : minX
    y      : minY
    width  : maxWidth
    height : maxHeight

You could also put all the elements in a Raphaël set and do getBBox() on that, of course.