78 lines
2.4 KiB
Clojure
78 lines
2.4 KiB
Clojure
(ns sprite-atlas
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(:require
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[clojure.java.io :as io]
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[engine]
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[rl :as rl]))
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(defonce state (atom {}))
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(defn init-sprite-atlas [config]
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(let [path (:sprite-path @state)]
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(if (.exists (io/file path))
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{:atlas (rl/load-texture path)}
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{})))
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(defn handle-sprite-atlas-input [_ game]
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(cond-> game
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(rl/mouse-button-pressed? rl/mouse-button-left)
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(assoc :drag-start (rl/get-mouse-position))
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(rl/mouse-button-released? rl/mouse-button-left)
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(assoc :event-drag-ended true)
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:always
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(as-> g (cond-> g
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(contains? g :drag-start)
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(assoc :current-mouse-pos (rl/get-mouse-position))))))
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(defn- get-selection-rect [{ax :x ay :y} {bx :x by :y}]
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(let [start-x (min ax bx)
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start-y (min ay by)
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end-x (max ax bx)
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end-y (max ay by)]
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{:x start-x :y start-y :w (- end-x start-x) :h (- end-y start-y)}))
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(defn update-sprite-atlas [_ game]
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(cond-> game
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(contains? game :event-drag-ended)
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(-> (assoc :selected-sprite (get-selection-rect (:drag-start game) (:current-mouse-pos game)))
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(dissoc :event-drag-ended :drag-start :current-mouse-pos))))
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(defn draw-sprite-atlas [_ {:keys [atlas drag-start current-mouse-pos selected-sprite]}]
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(rl/clear-background!* rl/black)
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(when atlas
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(rl/draw-texture!* (:seg atlas) 0 0 rl/white)
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(when drag-start
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(let [start-x (:x drag-start)
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start-y (:y drag-start)
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end-x (:x current-mouse-pos)
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end-y (:y current-mouse-pos)]
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(rl/draw-rectangle-lines!* start-x start-y (- end-x start-x) (- end-y start-y) rl/white)))
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(when selected-sprite
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(let [{:keys [x y w h]} selected-sprite]
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(rl/draw-texture-rec!* (:seg atlas) (rl/rect-seg x y w h) (rl/vec2-seg 30 30) rl/white)))
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(rl/draw-fps 10 10)))
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(defn watch-sprite-atlas [config game]
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{})
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(defn unload-sprite-atlas [game]
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(rl/unload-texture! (:atlas game)))
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(defn -main [& sprite-path]
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(swap! state assoc :sprite-path (first sprite-path))
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(engine/run-game!
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{:title "Sprite Atlas"
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:width 1280
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:height 900
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:init #'init-sprite-atlas
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:input #'handle-sprite-atlas-input
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:update #'update-sprite-atlas
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:draw #'draw-sprite-atlas
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:unload #'unload-sprite-atlas
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:watch-fn #'watch-sprite-atlas}))
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(comment
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(future (-main "./source-assets/thai_village.png"))
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:-)
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