Konjure Kreate

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main.kj⌘ / Ctrl + Enter

// Spinner owns its state and behavior; Rotate joins the live components.
type Spinner {
  angle: Number = 0;
  speed: Number = 1;

func advance(dt: Number) -> Res[Vec3, DataError] {
    self.angle = (self.angle + (self.speed * dt)?)?;
    let x = (self.angle * 0.5)?;
    ret Ok(Vec3 { y: self.angle, x: x });
  }

func reverse() -> Res[Unit, DataError] {
    self.speed = (-self.speed)?;
    ret Ok(());
  }
}

func make_spinner(x: Number, speed: Number) -> Entity {
  let item = spawn(Transform { position: Vec3 { x: x } });
  add(item, Box { size: Vec3 { x: 0.5, y: 0.5, z: 0.5 } });
  add(item, Material { color: "#b6a0ff" });
  add(item, Spinner { speed: speed });
  ret item;
}

let left = make_spinner(-1.2, 0.8);
let center = make_spinner(0, 1.2);
let right = make_spinner(1.2, 1.6);

system Rotate of (spinner: Spinner, pose: Transform) {
  func frame(dt: Number) -> Res[Unit, DataError] {
    pose.rotation = spinner.advance(dt)?;
    ret Ok(());
  }
}

func reverse() -> Res[Unit, DataError] {
  for item in query[Spinner]() {
    let mut spinner = get[Spinner](item);
    spinner.reverse()?;
    set(item, spinner);
  }
  print("Direction reversed");
  ret Ok(());
}

export reverse;
let control = spawn(Button { label: "Reverse", action: reverse });

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