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