sprite was following a path is going to scroll; fixed bug in
getDirection(); added setDuration() which computes the path velocity based
on the time that the sprite should spend following the path.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1252 542714f4-19e9-0310-aa3c-eee0fc999fb1
Modified sprite and path code to make use of these timestamps to determine
a sprite's progress along the path. Abstracted the path stuff so that
paths other than line segment paths can be cleanly implemented.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@337 542714f4-19e9-0310-aa3c-eee0fc999fb1