51 lines
1.6 KiB
Factor
51 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 math.vectors sequences tetris.tetromino lists.lazy ;
|
|
IN: tetris.piece
|
|
|
|
! The rotation is an index into the tetromino's states array, and the
|
|
! position is added to the tetromino's blocks to give them their location on the
|
|
! tetris board. If the location is f then the piece is not yet on the board.
|
|
|
|
TUPLE: piece
|
|
{ tetromino tetromino }
|
|
{ rotation integer initial: 0 }
|
|
{ location array initial: { 0 0 } } ;
|
|
|
|
: <piece> ( tetromino -- piece )
|
|
piece new swap >>tetromino ;
|
|
|
|
: (piece-blocks) ( piece -- blocks )
|
|
! rotates the piece
|
|
[ rotation>> ] [ tetromino>> states>> ] bi nth ;
|
|
|
|
: piece-blocks ( piece -- blocks )
|
|
! rotates and positions the piece
|
|
[ (piece-blocks) ] [ location>> ] bi [ v+ ] curry map ;
|
|
|
|
: piece-width ( piece -- width )
|
|
piece-blocks blocks-width ;
|
|
|
|
: set-start-location ( piece board-width -- piece )
|
|
over piece-width [ 2 /i ] bi@ - 0 2array >>location ;
|
|
|
|
: <random-piece> ( board-width -- piece )
|
|
random-tetromino <piece> swap set-start-location ;
|
|
|
|
: <piece-llist> ( board-width -- llist )
|
|
[ [ <random-piece> ] curry ] keep [ <piece-llist> ] curry lazy-cons ;
|
|
|
|
: modulo ( n m -- n )
|
|
! -2 7 mod => -2, -2 7 modulo => 5
|
|
[ mod ] [ + ] [ mod ] tri ;
|
|
|
|
: (rotate-piece) ( rotation inc n-states -- rotation' )
|
|
[ + ] dip modulo ;
|
|
|
|
: rotate-piece ( piece inc -- piece )
|
|
over tetromino>> states>> length
|
|
[ (rotate-piece) ] 2curry change-rotation ;
|
|
|
|
: move-piece ( piece move -- piece )
|
|
[ v+ ] curry change-location ;
|