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- ;; https://p.hagelb.org/pong.fnl.html
- (local (speed ball-speed) (values 1 200))
- (local (w h) (love.window.getMode))
- (local _state {:x 100 :y 100 :dx 2 :dy 1 :left (- (/ h 2) 50) :right (- (/ h 2) 50)})
- (global state {:x 100 :y 100 :dx 2 :dy 1 :left (- (/ h 2) 50) :right (- (/ h 2) 50)})
- (var pause false)
- (local keys {:a [:left -1] :z [:left 1] :up [:right -1] :down [:right 1]})
- (fn on-paddle? []
- (or (and (< state.x 20)
- (< state.left state.y) (< state.y (+ state.left 100)))
- (and (< (- w 20) state.x)
- (< state.right state.y) (< state.y (+ state.right 100)))))
- {
- :name "pong"
- :init (fn init []
- (set pause false)
- (each [k v (pairs _state)]
- (tset state k v)))
- :update (fn update [dt set-mode]
- (when (not pause)
- (set state.x (+ state.x (* state.dx dt ball-speed)))
- (set state.y (+ state.y (* state.dy dt ball-speed)))
- (each [key action (pairs keys)]
- (let [[player dir] action]
- (when (love.keyboard.isDown key)
- (tset state player (+ (. state player) (* dir speed))))))
- (when (or
- (< state.y 0)
- (> state.y h))
- (set state.dy (- 0 state.dy)))
- (when (on-paddle?)
- (set state.dx (- 0 state.dx)))
- (when (< state.x 0)
- (set-mode "mode.end" "2"))
- (when (> state.x w)
- (set-mode "mode.end" "1"))))
- :keypressed (fn keypressed [key set-mode]
- (when (= "p" key)
- (set pause (not pause))))
- :draw (fn draw [m]
- (when (not pause)
- (love.graphics.rectangle "fill" 10 state.left 10 100)
- (love.graphics.rectangle "fill" (- w 20) state.right 10 100)
- (love.graphics.circle "fill" state.x state.y 10))
- (when pause
- (love.graphics.printf "Press 'p' to unpause" 0 (/ h 3) w "center")))
- }
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