47 lines
1.5 KiB
Fennel
47 lines
1.5 KiB
Fennel
(fn dir-from-key [keymap]
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(var (dx dy) (values 0 0))
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(when (love.keyboard.isDown keymap.up) (set dy -1))
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(when (love.keyboard.isDown keymap.down) (set dy 1))
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(when (love.keyboard.isDown keymap.left) (set dx -1))
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(when (love.keyboard.isDown keymap.right) (set dx 1))
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[dx dy])
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(fn vec-scalarop [op]
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(fn [vec scalar]
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(icollect [_ v (ipairs vec)] (op v scalar))))
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(fn vec-op [op]
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(fn [vec val]
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(icollect [i left (ipairs vec)]
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(let [right (match (type val)
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:table (. val i)
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_ val)]
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(op left right)))))
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(local vec* (vec-op #(* $1 $2)))
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(local vec+ (vec-op #(+ $1 $2)))
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(fn coordinate-iterator [state]
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(let [{: x : y} state
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xnext (+ (or x state.w) 1)
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ynext (+ (or y state.h) 1)]
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(if (< xnext state.w) (set state.x xnext)
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(< ynext state.h) (do (set state.x 0) (set state.y ynext))
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(do (set state.x nil) (set state.y nil)))
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(values x y)))
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(fn all-coordinates [w h] (values coordinate-iterator {: w : h :x 0 :y 0}))
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(fn edge [c dc neg-offset ?pos-offset]
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(local pos-offset (if (= ?pos-offset nil) neg-offset ?pos-offset))
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(if (= dc 0) (values c c)
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(< dc 0) (values (- c neg-offset) (+ c dc (- neg-offset)))
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(values (+ c pos-offset) (+ c dc pos-offset))))
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(fn edge-crosses [c1 c2 width]
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(if (= c1 c2) false
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(or (= (% c1 width) 0) (= (% c2 width) 0)) true
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(not= (math.floor (/ c1 width)) (math.floor (/ c2 width)))))
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{: dir-from-key : vec* : vec+ : vec-op : all-coordinates : edge : edge-crosses}
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