--- /dev/null
+! Copyright (C) 2015 Sankaranarayanan Viswanathan
+! See http://factorcode.org/license.txt for BSD license.
+USING: accessors arrays assocs calendar combinators destructors
+formatting hash-sets images.loader kernel locals make math
+namespaces opengl opengl.textures random sequences sets sorting
+snake-game.helper timers ui ui.gadgets ui.gadgets.status-bar
+ui.gadgets.worlds ui.gestures ui.render vocabs.loader ;
+
+IN: snake-game
+
+SYMBOLS: :left :right :up :down ;
+
+SYMBOLS: :head :body :tail ;
+
+SYMBOL: game-textures
+
+CONSTANT: snake-game-dim { 12 10 }
+
+TUPLE: snake-game
+ snake snake-loc snake-dir food-loc
+ { next-turn-dir initial: f }
+ { score integer initial: 0 }
+ { paused? boolean initial: t }
+ { game-over? boolean initial: f } ;
+
+TUPLE: snake-part
+ dir type ;
+
+: <snake-part> ( dir type -- snake-part )
+ snake-part boa ;
+
+: <snake> ( -- snake )
+ [
+ :left :head <snake-part> ,
+ :left :body <snake-part> ,
+ :left :tail <snake-part> ,
+ ] V{ } make ;
+
+: <snake-game> ( -- snake-game )
+ snake-game new
+ <snake> >>snake
+ { 5 4 } clone >>snake-loc
+ :right >>snake-dir
+ { 1 1 } clone >>food-loc ;
+
+TUPLE: snake-gadget < gadget
+ snake-game timer textures ;
+
+: start-new-game ( snake-gadget -- )
+ <snake-game> >>snake-game drop ;
+
+: <snake-gadget> ( -- snake-gadget )
+ snake-gadget new
+ [ start-new-game ] keep ;
+
+: opposite-dir ( dir -- dir )
+ H{
+ { :left :right }
+ { :right :left }
+ { :up :down }
+ { :down :up }
+ } at ;
+
+: lookup-texture ( key -- texture )
+ game-textures get at ;
+
+: screen-loc ( loc -- loc )
+ [ 20 * ] map ;
+
+: draw-sprite* ( key screen-loc -- )
+ [ lookup-texture draw-texture ] with-translation ;
+
+: draw-sprite ( grid-loc key -- )
+ swap screen-loc draw-sprite* ;
+
+: draw-food ( loc -- )
+ "food" draw-sprite ;
+
+: draw-background ( -- )
+ { 0 0 } "background" draw-sprite ;
+
+: offset ( loc dim -- loc )
+ [ + ] 2map ;
+
+: draw-snake-head ( loc facing-dir -- )
+ dup name>> rest "head-" prepend
+ [
+ [ screen-loc ] dip
+ {
+ { :right [ { -20 -10 } ] }
+ { :down [ { -10 -20 } ] }
+ { :up [ { -10 0 } ] }
+ { :left [ { 0 -10 } ] }
+ } case offset
+ ] dip
+ swap draw-sprite* ;
+
+: draw-snake-body ( loc from-dir to-dir -- )
+ 2array [ name>> rest ] map "body" prefix "-" join
+ draw-sprite ;
+
+: draw-snake-tail ( loc facing-dir -- )
+ name>> rest "tail-" prepend draw-sprite ;
+
+: draw-snake-part ( loc from-dir snake-part -- )
+ dup type>> {
+ { :head [ drop opposite-dir draw-snake-head ] }
+ { :tail [ drop draw-snake-tail ] }
+ { :body [ dir>> draw-snake-body ] }
+ } case ;
+
+: ?roll-over ( x max -- x )
+ {
+ { [ 2dup >= ] [ 2drop 0 ] }
+ { [ over neg? ] [ nip 1 - ] }
+ [ drop ]
+ } cond ;
+
+: ?roll-over-x ( x -- x )
+ snake-game-dim first ?roll-over ;
+
+: ?roll-over-y ( y -- y )
+ snake-game-dim second ?roll-over ;
+
+: move ( loc dim -- loc )
+ offset first2
+ [ ?roll-over-x ] [ ?roll-over-y ] bi* 2array ;
+
+: relative-loc ( loc dir -- loc )
+ {
+ { :left [ { -1 0 } move ] }
+ { :right [ { 1 0 } move ] }
+ { :up [ { 0 -1 } move ] }
+ { :down [ { 0 1 } move ] }
+ } case ;
+
+: draw-snake-reduce-step ( loc from-dir snake-part -- {new-loc,new-from-dir} )
+ nip dir>> [ relative-loc ] keep 2array ;
+
+: draw-snake ( snake loc from-dir -- )
+ 2array 2dup
+ [
+ [ first2 ] dip
+ [ draw-snake-part ] [ draw-snake-reduce-step ] 3bi
+ ] reduce drop
+ ! make sure to draw the head again
+ swap first [ first2 ] dip draw-snake-part ;
+
+: grow-snake ( snake dir -- snake )
+ opposite-dir :head <snake-part> prefix
+ dup second :body >>type drop ;
+
+: snake-shape ( snake -- dirs )
+ [ dir>> ] map ;
+
+: move-snake ( snake dir -- snake )
+ dupd [ snake-shape but-last ] dip
+ opposite-dir prefix [ >>dir ] 2map ;
+
+: update-snake-shape ( snake-game dir growing? -- )
+ [ [ grow-snake ] curry change-snake ]
+ [ [ move-snake ] curry change-snake ]
+ if drop ;
+
+: update-snake-loc ( snake-game dir -- )
+ [ relative-loc ] curry change-snake-loc drop ;
+
+: update-snake-dir ( snake-game dir -- )
+ >>snake-dir drop ;
+
+: point>index ( loc -- n )
+ first2 [ ] [ snake-game-dim first * ] bi* + ;
+
+: index>point ( n -- loc )
+ snake-game-dim first /mod swap 2array ;
+
+: snake-occupied-locs ( snake head-loc -- points )
+ [ dir>> relative-loc ] accumulate nip ;
+
+: snake-occupied-indices ( snake head-loc -- points )
+ snake-occupied-locs [ point>index ] map natural-sort ;
+
+: all-indices ( -- points )
+ snake-game-dim first2 * iota ;
+
+: snake-unoccupied-indices ( snake head-loc -- points )
+ [ all-indices ] 2dip snake-occupied-indices >hash-set without ;
+
+: snake-will-eat-itself? ( snake-game dir -- ? )
+ [ [ snake>> ] [ snake-loc>> ] bi ] dip relative-loc
+ [ snake-occupied-locs rest ] keep
+ swap member? ;
+
+: snake-will-eat-food? ( snake-game dir -- ? )
+ [ [ food-loc>> ] [ snake-loc>> ] bi ] dip
+ relative-loc = ;
+
+: random-sample ( seq -- e )
+ 1 sample first ;
+
+: generate-food ( snake-game -- )
+ [
+ [ snake>> ] [ snake-loc>> ] bi
+ snake-unoccupied-indices random-sample index>point
+ ] keep food-loc<< ;
+
+: update-score ( snake-game -- )
+ [ 1 + ] change-score
+ drop ;
+
+: update-snake ( snake-game dir -- )
+ 2dup snake-will-eat-food?
+ {
+ [ [ drop update-score ] [ 2drop ] if ]
+ [ update-snake-shape ]
+ [ drop update-snake-loc ]
+ [ drop update-snake-dir ]
+ [ nip [ generate-food ] [ drop ] if ]
+ } 3cleave ;
+
+: game-over ( snake-game -- )
+ t >>game-over? drop ;
+
+: game-in-progress? ( snake-game -- ? )
+ [ game-over?>> ] [ paused?>> ] bi or not ;
+
+: ?handle-pending-turn ( snake-game -- )
+ dup next-turn-dir>> [
+ >>snake-dir
+ f >>next-turn-dir
+ ] when* drop ;
+
+: do-game-step ( gadget -- )
+ dup game-in-progress? [
+ dup ?handle-pending-turn
+ dup snake-dir>>
+ 2dup snake-will-eat-itself?
+ [ drop game-over ] [ update-snake ] if
+ ] [ drop ] if ;
+
+: generate-status-message ( snake-game -- str )
+ [ score>> "Score: %d" sprintf ]
+ [
+ {
+ { [ dup game-over?>> ] [ drop "Game Over" ] }
+ { [ dup paused?>> ] [ drop "Game Paused" ] }
+ [ drop "Game In Progress" ]
+ } cond
+ ]
+ bi 2array " -- " join ;
+
+: update-status ( gadget -- )
+ [ snake-game>> generate-status-message ] keep show-status ;
+
+: do-updates ( gadget -- )
+ [ snake-game>> do-game-step ]
+ [ update-status ]
+ [ relayout-1 ]
+ tri ;
+
+M: snake-gadget pref-dim*
+ drop snake-game-dim [ 20 * 20 + ] map ;
+
+: load-sprite-image ( filename -- image )
+ [ snake-game vocabulary>> vocab-dir ] dip
+ "vocab:%s/%s" sprintf load-image ;
+
+: make-texture ( image -- texture )
+ { 0 0 } <texture> ;
+
+: make-sprites ( filename cols rows -- seq )
+ [ load-sprite-image ] 2dip generate-sprite-sheet
+ [ make-texture ] map ;
+
+: snake-head-textures ( -- assoc )
+ "head.png" 1 4 make-sprites
+ { "head-up" "head-right" "head-down" "head-left" }
+ [ swap 2array ] 2map ;
+
+:: assoc-with-value-like ( assoc key seq -- )
+ key assoc at :> value
+ seq [ [ value ] dip assoc set-at ] each ;
+
+: snake-body-textures ( -- assoc )
+ "body.png" 3 2 make-sprites
+ { 1 2 3 4 5 6 }
+ [ swap 2array ] 2map
+ dup 1 { "body-right-up" "body-down-left" } assoc-with-value-like
+ dup 2 { "body-down-right" "body-left-up" } assoc-with-value-like
+ dup 3 { "body-right-right" "body-left-left" } assoc-with-value-like
+ dup 4 { "body-up-up" "body-down-down" } assoc-with-value-like
+ dup 5 { "body-up-right" "body-left-down" } assoc-with-value-like
+ dup 6 { "body-right-down" "body-up-left" } assoc-with-value-like
+ dup [ { 1 2 3 4 5 6 } ] dip [ delete-at ] curry each ;
+
+: snake-tail-textures ( -- assoc )
+ "tail.png" 2 2 make-sprites
+ { "tail-down" "tail-left" "tail-up" "tail-right" }
+ [ swap 2array ] 2map ;
+
+: food-texture ( -- assoc )
+ "food" "food.png" load-sprite-image make-texture
+ 2array 1array ;
+
+: background-texture ( -- assoc )
+ "background" "background.png" load-sprite-image make-texture
+ 2array 1array ;
+
+: load-game-textures ( snake-gadget -- textures )
+ dup textures>> [ ] [
+ [
+ snake-head-textures %%
+ snake-body-textures %%
+ snake-tail-textures %%
+ food-texture %%
+ background-texture %%
+ ] H{ } make >>textures
+ textures>>
+ ] ?if ;
+
+M: snake-gadget draw-gadget*
+ [ load-game-textures game-textures ] keep [
+ draw-background
+ { 10 10 } [
+ snake-game>>
+ [ food-loc>> [ draw-food ] when* ]
+ [
+ [ snake>> ]
+ [ snake-loc>> ]
+ [ snake-dir>> opposite-dir ]
+ tri draw-snake
+ ] bi
+ ] with-translation
+ ] curry with-variable ;
+
+M: snake-gadget graft*
+ [ [ do-updates ] curry 200 milliseconds every ] keep timer<< ;
+
+M: snake-gadget ungraft*
+ [ stop-timer f ] change-timer
+ dup textures>> values [ dispose ] each
+ f >>textures drop ;
+
+: key-action ( key -- action )
+ H{
+ { "RIGHT" :right }
+ { "LEFT" :left }
+ { "UP" :up }
+ { "DOWN" :down }
+ } at ;
+
+: quit-key? ( key -- ? )
+ HS{ "ESC" "q" "Q" } in? ;
+
+: pause-key? ( key -- ? )
+ HS{ " " "SPACE" "p" "P" } in? ;
+
+: new-game-key? ( key -- ? )
+ HS{ "ENTER" "RET" "n" "N" } in? ;
+
+: ?handle-movement-key ( snake-game key -- )
+ key-action
+ [
+ 2dup [ snake-dir>> opposite-dir ] dip =
+ [ 2drop ] [ >>next-turn-dir drop ] if
+ ] [ drop ] if* ;
+
+: toggle-game-pause ( snake-gadget -- )
+ snake-game>> [ not ] change-paused? drop ;
+
+: handle-key ( snake-gadget key -- )
+ {
+ { [ dup quit-key? ] [ drop close-window ] }
+ { [ dup pause-key? ] [ drop toggle-game-pause ] }
+ { [ dup new-game-key? ] [ drop start-new-game ] }
+ [
+ [ snake-game>> ] dip over
+ game-in-progress? [ ?handle-movement-key ] [ 2drop ] if
+ ]
+ } cond ;
+
+M: snake-gadget handle-gesture
+ swap dup key-down?
+ [ sym>> handle-key ] [ 2drop ] if f ;
+
+: <snake-world-attributes> ( -- world-attributes )
+ <world-attributes> "Snake Game" >>title
+ [
+ { maximize-button resize-handles } without
+ ] change-window-controls ;
+
+: play-snake-game ( -- )
+ [ <snake-gadget> <snake-world-attributes> open-status-window ] with-ui ;
+
+MAIN: play-snake-game
projects / factor.git / commitdiff
