1 ! Copyright (C) 2015 Sankaranarayanan Viswanathan.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays assocs calendar combinators destructors
4 formatting kernel make math math.vectors namespaces opengl
5 opengl.textures sequences sets snake-game.game
6 snake-game.sprites timers ui ui.gadgets ui.gadgets.worlds
7 ui.gestures ui.render ;
13 TUPLE: snake-gadget < gadget
14 snake-game timer textures ;
16 : start-new-game ( snake-gadget -- )
17 <snake-game> >>snake-game drop ;
19 : <snake-gadget> ( -- snake-gadget )
20 snake-gadget new [ start-new-game ] keep ;
22 CONSTANT: snake-game-cell-size 20
24 : game-loc>screen-loc ( loc -- loc )
25 [ snake-game-cell-size * ] map ;
27 : lookup-texture ( key -- texture )
28 game-textures get at ;
30 : draw-sprite* ( key screen-loc -- )
31 [ lookup-texture draw-texture ] with-translation ;
33 : draw-sprite ( grid-loc key -- )
34 swap game-loc>screen-loc draw-sprite* ;
36 : draw-food ( loc -- )
39 : draw-background ( -- )
40 { 0 0 } "background" draw-sprite ;
42 : draw-snake-head ( loc facing-dir -- )
43 dup name>> rest "head-" prepend [
44 [ game-loc>screen-loc ] dip
46 { :right [ { -20 -10 } ] }
47 { :down [ { -10 -20 } ] }
49 { :left [ { 0 -10 } ] }
51 ] dip swap draw-sprite* ;
53 : draw-snake-body ( loc from-dir to-dir -- )
54 [ name>> rest ] bi@ "body-%s-%s" sprintf draw-sprite ;
56 : draw-snake-tail ( loc facing-dir -- )
57 name>> rest "tail-" prepend draw-sprite ;
59 : draw-snake-part ( loc from-dir snake-part -- )
61 { :head [ drop opposite-dir draw-snake-head ] }
62 { :body [ dir>> draw-snake-body ] }
63 { :tail [ drop draw-snake-tail ] }
66 : next-snake-loc-from-dir ( loc from-dir snake-part -- new-loc new-from-dir )
67 nip dir>> [ move-loc ] keep ;
69 : draw-snake ( loc from-dir snake -- )
72 [ next-snake-loc-from-dir ] 3bi
74 ! make sure to draw the head again
75 first draw-snake-part ;
77 : generate-status-message ( snake-game -- str )
81 { [ dup game-over?>> ] [ drop "Game Over" ] }
82 { [ dup paused?>> ] [ drop "Game Paused" ] }
83 [ drop "Game In Progress" ]
85 ] bi "Score: %d -- %s" sprintf ;
87 : update-status ( gadget -- )
88 [ snake-game>> generate-status-message ] keep show-status ;
90 : do-updates ( gadget -- )
91 [ snake-game>> do-game-step ]
96 : toggle-game-pause ( snake-gadget -- )
97 snake-game>> [ not ] change-paused? drop ;
99 : key-action ( key -- action )
107 : quit-key? ( key -- ? )
108 HS{ "ESC" "q" "Q" } in? ;
110 : pause-key? ( key -- ? )
111 HS{ " " "SPACE" "p" "P" } in? ;
113 : new-game-key? ( key -- ? )
114 HS{ "ENTER" "RET" "n" "N" } in? ;
116 : ?handle-movement-key ( snake-game key -- )
119 2dup [ snake-dir>> opposite-dir ] dip =
120 [ 2drop ] [ >>next-turn-dir drop ] if
123 : handle-key ( snake-gadget key -- )
125 { [ dup quit-key? ] [ drop close-window ] }
126 { [ dup pause-key? ] [ drop toggle-game-pause ] }
127 { [ dup new-game-key? ] [ drop start-new-game ] }
129 [ snake-game>> ] dip over
130 game-in-progress? [ ?handle-movement-key ] [ 2drop ] if
134 : load-game-textures ( snake-gadget -- textures )
137 snake-head-textures %%
138 snake-body-textures %%
139 snake-tail-textures %%
141 background-texture %%
142 ] H{ } make >>textures
146 M: snake-gadget graft*
147 [ [ do-updates ] curry 200 milliseconds every ] keep timer<< ;
149 M: snake-gadget ungraft*
150 [ stop-timer f ] change-timer
151 [ values dispose-each f ] change-textures
154 M: snake-gadget pref-dim*
155 drop snake-game-dim [ snake-game-cell-size * 20 + ] map ;
157 M: snake-gadget draw-gadget*
158 [ load-game-textures game-textures ] keep [
162 [ food-loc>> [ draw-food ] when* ]
165 [ snake-dir>> opposite-dir ]
170 ] curry with-variable ;
172 M: snake-gadget handle-gesture
174 [ sym>> handle-key ] [ 2drop ] if f ;