unitbezier Unit bezier interpolation function: a port to JavaScript from Webkit: http://svn.webkit.org/repository/webkit/trunk/Source/WebCore/platform/graphics/UnitBezier.h api new UnitBezier(p1x, p1y, p2x, p2y) Initialize a new bezier curve given the points bezier.solve(x, epsilon) Evaluate bezier for value x (ranging from 0 to 1) with epsilon precision (1e-6 by default).