56 lines
1.6 KiB
Factor
56 lines
1.6 KiB
Factor
! Copyright (C) 2006, 2007, 2008 Alex Chapman
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: accessors arrays kernel math sequences tetris.piece ;
|
|
IN: tetris.board
|
|
|
|
TUPLE: board { width integer } { height integer } rows ;
|
|
|
|
: make-rows ( width height -- rows )
|
|
[ drop f <array> ] with map ;
|
|
|
|
: <board> ( width height -- board )
|
|
2dup make-rows board boa ;
|
|
|
|
#! A block is simply an array of form { x y } where { 0 0 } is the top-left of
|
|
#! the tetris board, and { 9 19 } is the bottom right on a 10x20 board.
|
|
|
|
: board@block ( board block -- n row )
|
|
[ second swap rows>> nth ] keep first swap ;
|
|
|
|
: set-block ( board block colour -- ) -rot board@block set-nth ;
|
|
|
|
: block ( board block -- colour ) board@block nth ;
|
|
|
|
: block-free? ( board block -- ? ) block not ;
|
|
|
|
: block-in-bounds? ( board block -- ? )
|
|
[ first swap width>> bounds-check? ] 2keep
|
|
second swap height>> bounds-check? and ;
|
|
|
|
: location-valid? ( board block -- ? )
|
|
2dup block-in-bounds? [ block-free? ] [ 2drop f ] if ;
|
|
|
|
: piece-valid? ( board piece -- ? )
|
|
piece-blocks [ location-valid? ] with all? ;
|
|
|
|
: row-not-full? ( row -- ? ) f swap member? ;
|
|
|
|
: add-row ( board -- board )
|
|
dup rows>> over width>> f <array> prefix >>rows ;
|
|
|
|
: top-up-rows ( board -- )
|
|
dup height>> over rows>> length = [
|
|
drop
|
|
] [
|
|
add-row top-up-rows
|
|
] if ;
|
|
|
|
: remove-full-rows ( board -- board )
|
|
[ [ row-not-full? ] filter ] change-rows ;
|
|
|
|
: check-rows ( board -- n )
|
|
#! remove full rows, then add blank ones at the top, returning the number
|
|
#! of rows removed (and added)
|
|
remove-full-rows dup height>> over rows>> length - swap top-up-rows ;
|
|
|