33 lines
1.2 KiB
Scala
33 lines
1.2 KiB
Scala
package snake
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package pong
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import PongModel.initialPong
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/** m11 pong app: the same wiring as App.scala (streams in, drawings out), reusing the course's modules. */
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object PongApp:
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val FRAME_MS_PONG: Long = 30
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private def paddleKey(key: String): Option[Paddle] = key match
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case "ArrowUp" | "w" | "W" => Some(Paddle.Up)
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case "ArrowDown" | "s" | "S" => Some(Paddle.Down)
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case _ => None
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def pongKey(isDown: Boolean, key: String): Option[PongAction] =
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paddleKey(key) match
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case Some(p) => Some(if isDown then PongAction.Press(p) else PongAction.Release(p))
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case None => if isDown && (key == "r" || key == "R") then Some(PongAction.Restart) else None
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lazy val pongActions: Stream[PongAction] =
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Stream
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.interval(FRAME_MS_PONG)
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.map(_ => PongAction.Frame)
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.merge(Stream.keyDowns.filterMap(pongKey(true, _)))
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.merge(Stream.keyUps.filterMap(pongKey(false, _)))
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def pongStates(seed: Long, actions: Stream[PongAction]): Stream[PongState] =
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actions.scan(initialPong(seed))(PongRules.pongUpdate).startWith(initialPong(seed))
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lazy val pongMain: IO[Stream[IO[Unit]]] =
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IO.randomSeed.map(seed => pongStates(seed, pongActions).map(state => IO.drawScene(PongView.pongView(state))))
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