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-from a to k
-
-- a title frame showing game name and instructions. space to continue.
-- a main frame showing the game running
-- a endofgame frame showing game results: win or lose
-
-- a Board class with cell being a 4 by 4 two-d array.
-- arrange strings according to an orientation: arrange(4 strings, dir)=cells
- - dir: 0: align to left, 1: align to right, 2: align to top, 3:align to bottom
- - e.g.: arrange({"abc", "bc", "dc", "efeh", 0}) gives the following board:
- abc_
- bc__
- dc__
- efeh
- - arrange({"abc", "bc", "dc", "efeh", 0}, 3) gives the following
- ___e
- a__f
- bbde
- ccch
-- a new tile of 'a' or 'b' appears each turn somewhere, using some quasirandomisation e.g. (23 * n^2 + 79) mod 16.
- - addtile(char, x, y)
-- the board transformation: board.trans(dir) = arrange(dir) . (fmap reduce) . getstring(dir). calls getstrings, then reduce on each row / column
-- board.getstrings(dir)= the strings according to direction dir. Inverse of arrange.
-- reduce(string)=string: reduce("baac")=="bbc"; reduce("aabb")=="bc"; and reduce("cbb")== "cc" instead of "d".
-- when one of the hjkl keys is pressed get the direction dir.