mirror of
https://github.com/diemheych/PrimeFORTH
synced 2024-11-16 19:48:00 +01:00
156 lines
2.7 KiB
Forth
156 lines
2.7 KiB
Forth
variable snake-x-head
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500 cells allot
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variable snake-y-head
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500 cells allot
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variable apple-x
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variable apple-y
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0 constant left
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1 constant up
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2 constant right
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3 constant down
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80 constant width
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60 constant height
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variable direction
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variable length
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: snake-x
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cells snake-x-head + ;
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: snake-y
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cells snake-y-head + ;
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: convert-x-y 24 cells * + ;
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: draw pixon4 ;
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: draw-black 0 col draw ;
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: draw-white 16777215 col draw ;
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: draw-red 16711680 col draw ;
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: draw-walls
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width 0 do
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i 0 draw-black
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i height 1 - draw-black
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loop
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height 0 do
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0 i draw-black
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width 1 - i draw-black
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loop ;
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: initialize-snake
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4 length !
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length @ 1 + 0 do
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12 i - i snake-x !
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12 i snake-y !
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loop
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down direction ! ;
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: set-apple-position apple-x ! apple-y ! ;
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: initialize-apple 50 50 set-apple-position ;
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: initialize
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width 0 do
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height 0 do
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j i draw-white
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loop
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loop
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draw-walls
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initialize-snake
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initialize-apple ;
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: move-up -1 snake-y-head +! ;
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: move-left -1 snake-x-head +! ;
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: move-down 1 snake-y-head +! ;
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: move-right 1 snake-x-head +! ;
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: move-snake-head direction @
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left over = if move-left else
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up over = if move-up else
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right over = if move-right else
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down over = if move-down
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then then then then drop ;
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: move-snake-tail 0 length @ do
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i snake-x @ i 1 + snake-x !
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i snake-y @ i 1 + snake-y !
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-1 +loop ;
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: is-horizontal direction @ dup
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left = swap
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right = or ;
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: is-vertical direction @ dup
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up = swap
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down = or ;
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: turn-up is-horizontal if up direction ! then ;
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: turn-left is-vertical if left direction ! then ;
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: turn-down is-horizontal if down direction ! then ;
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: turn-right is-vertical if right direction ! then ;
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: change-direction
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7 over = if turn-left else
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2 over = if turn-up else
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8 over = if turn-right else
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12 over = if turn-down
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then then then then drop ;
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: check-input
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lastkey change-direction
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;
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: random-position
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height 4 - random 2 +
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width 4 - random 2 + ;
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: move-apple
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apple-x @ apple-y @ draw-white
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random-position
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set-apple-position ;
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: grow-snake 1 length +! ;
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: check-apple
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snake-x-head @ apple-x @ =
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snake-y-head @ apple-y @ =
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and if
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move-apple
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grow-snake
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then ;
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: check-collision
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snake-x-head @ snake-y-head @
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getpix4
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0 = ;
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: draw-snake
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length @ 0 do
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i snake-x @ i snake-y @ draw-black
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loop
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length @ snake-x @
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length @ snake-y @
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draw-white ;
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: draw-apple
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apple-x @ apple-y @ draw-red ;
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: game-loop
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begin
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draw-snake
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draw-apple
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50 length @ - dup 0< if drop 5 then sleep
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check-input
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move-snake-tail
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move-snake-head
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check-apple
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check-collision
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until ;
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: snake cls initialize game-loop length @ . ;
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