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This weekend I was playing around with defining an animation DSL.

I've wanted to play this for a while after watching @davesmith00000's interview for "Scala for Fun & Profit" and @kubukoz Playdate talk. Everyone's doing DSLs for gamedev!

It's still quite rough, but I think it's useful for things like menu animations. Maybe I'll use something like this in the next GameJam entry to add a bit more juice to the menus.

This example looks like this:

  val backgroundAnimation = {
    linear(0, 512, 10.0).loop
      .map(delta => (delta.toInt, delta.toInt))
      .translateWrap
  }

  val baloonAnimation = {
    val rotation =
      (linear(-Math.PI / 32, Math.PI / 32, 1.0) >> linear(Math.PI / 32, -Math.PI / 32, 1.0)).rotate
    val beat =
      (easeOut(1.2, 0.9, 0.5) >> easeIn(0.9, 1.0, 0.1)).scaleXY

    (rotation && beat).loop.map(asSurfaceTransform)
  }

  val textAnimation = {
    val rotation =
      (easeIn(-Math.PI / 32, Math.PI / 32, 1.0) >> easeIn(Math.PI / 32, -Math.PI / 32, 1.0)).rotate
    val beat =
      (easeIn(1.3, 0.9, 0.5) >> easeIn(0.8, 1.0, 0.1)).scaleXY

    (rotation && beat).loop.map(asSurfaceTransform)
  }