123 lines
2 KiB
Forth
123 lines
2 KiB
Forth
# example:Chess
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This is the start of a chess game for RETRO.
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It's based heavily on an earlier, two player system for Retro 11.
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Begin a private namespace.
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````
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{{
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````
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Setup the default board.
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We use an ASCII character for each piece.
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| Char | Represents |
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| ---- | ---------- |
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| r | Rook |
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| n | Knight |
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| b | Bishop |
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| q | Queen |
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| k | King |
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| p | Pawn |
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Lowercase is used for black pieces, UPPERCASE for white.
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````
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:str:, (s-)
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[ , ] s:for-each ;
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'Blank d:create
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'rnbqkbnrpppppppp str:,
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'................ str:,
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'................ str:,
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'PPPPPPPPRNBQKBNR str:, #0 ,
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````
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The default board (named Blank) won't be direcly used. I create a second board for the actual gameplay.
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````
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'Board d:create
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#64 allot
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````
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Next up, the fundamentals of the display.
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It'll display like this:
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0_1_2_3_4_5_6_7
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+-----------------+
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0 | r n b q k b n r |
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1 | p p p p p p p p |
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2 | . . . . . . . . |
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3 | . . . . . . . . |
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4 | . . . . . . . . |
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5 | . . . . . . . . |
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6 | P P P P P P P P |
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7 | R N B Q K B N R |
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+-----------------+
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0_1_2_3_4_5_6_7
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So first up, the columns.
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````
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:cols (-)
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'____0_1_2_3_4_5_6_7 puts nl ;
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````
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Then a horizontal separator.
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````
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:--- (-)
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'__+-----------------+ puts nl ;
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````
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And then a row.
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Possible Future:
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````
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:row (a-a)
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'%n_|_ s:with-format puts
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#8 [ fetch-next putc sp ] times
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$| putc nl ;
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````
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These will be tied together a little later into the top level display word.
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````
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:get (rc-a) swap #8 * &Board + + ;
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---reveal---
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:chess:display (-)
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nl cols ---
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&Board #0 row
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#1 row
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#2 row
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#3 row
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#4 row
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#5 row
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#6 row
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#7 row drop
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--- cols nl ;
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:chess:new (-)
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&Blank &Board #64 copy ;
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:chess:move (rcrc-)
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get [ get ] dip swap
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dup fetch swap $. swap store
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swap store ;
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````
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Close the private namespace.
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````
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}}
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````
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````
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chess:new
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#0 #0 #2 #1 chess:move chess:display
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````
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