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added seven bag randomizer for tetris #26

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added seven bag randomizer for tetris #26

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14 changes: 13 additions & 1 deletion lisp/play/tetris.el
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Original file line number Diff line number Diff line change
Expand Up @@ -233,6 +233,7 @@ each one of its four blocks.")
(defvar-local tetris-pos-x 0)
(defvar-local tetris-pos-y 0)
(defvar-local tetris-paused nil)
(defvar-local tetris-bag nil)

;; ;;;;;;;;;;;;; keymaps ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

Expand Down Expand Up @@ -341,10 +342,21 @@ each one of its four blocks.")
(let ((period (tetris-get-tick-period)))
(if period (gamegrid-set-timer period))))

(defun tetris-shuffle (sequence)
(loop for i from (length sequence) downto 2 do
(rotatef (elt sequence (random i))
(elt sequence (1- i))))
sequence)

(defun tetris-seven-bag ()
(when (not tetris-bag)
(setq tetris-bag (tetris-shuffle (list 0 1 2 3 4 5 6))))
(pop tetris-bag))

(defun tetris-new-shape ()
(setq tetris-shape tetris-next-shape)
(setq tetris-rot 0)
(setq tetris-next-shape (random 7))
(setq tetris-next-shape (tetris-seven-bag))
(setq tetris-pos-x (/ (- tetris-width (tetris-shape-width)) 2))
(setq tetris-pos-y 0)
(if (tetris-test-shape)
Expand Down