37 lines
1.3 KiB
FSharp
37 lines
1.3 KiB
FSharp
/// m11 pong app: the same wiring as App.fs (streams in, drawings out), reusing the course's modules.
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module Snake.Pong.App
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open Snake
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open Snake.IO
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open Snake.Stream
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open Snake.Pong.Model
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open Snake.Pong.Rules
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open Snake.Pong.View
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let FRAME_MS_PONG = 30L
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let private paddleKey (key: string) : Paddle option =
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match key with
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| "ArrowUp" | "w" | "W" -> Some Paddle.Up
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| "ArrowDown" | "s" | "S" -> Some Paddle.Down
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| _ -> None
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let pongKey (isDown: bool) (key: string) : PongAction option =
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match paddleKey key with
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| Some p -> Some(if isDown then PongAction.Press p else PongAction.Release p)
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| None -> if isDown && (key = "r" || key = "R") then Some PongAction.Restart else None
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let pongActions: Stream<PongAction> =
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Stream.merge
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(Stream.merge
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(Stream.interval FRAME_MS_PONG |> Stream.map (fun _ -> PongAction.Frame))
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(Stream.keyDowns |> Stream.choose (pongKey true)))
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(Stream.keyUps |> Stream.choose (pongKey false))
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let pongStates (seed: uint32) (actions: Stream<PongAction>) : Stream<PongState> =
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actions |> Stream.scan pongUpdate (initialPong seed) |> Stream.startWith (initialPong seed)
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let pongMain () : IO<Stream<IO<unit>>> =
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IO.randomSeed ()
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|> IO.map (fun seed -> pongStates seed pongActions |> Stream.map (fun state -> IO.drawScene (pongView state)))
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