Please lint your code!

[mpetrovich]

You have a number of leaked globals and typos that could cause issues for other scripts. Any serious third-party library should have basic linting.

Using the popular JSHint tool, I was able to find a number of potentially serious issues:

Circle area calculation is completely wrong due to a typo in path.coffee:

area: ->
        me = @
        Math.PI * me.r*m.r  // "m.r" should be "me.r"

Line.clipToBBox() references a non-existent len() function:

                if p1x != x1 or p1y != y0 or i == len(self.points)-2
                    pts.push([x1, y1])

scale.identity() has an incorrect signature, causing the wrong values to be passed to the Scale constructor:

scale.identity = (s) ->
    new Scale(domain, prop, filter).rangedScale  // domain, prop, filter should be arguments to identity()

These are just a few of the warnings & errors reported by a linter like JSHint. Most of these are trivial to fix and are pretty silly to see in such a popular third-party library.