Code Sketch

import java.awt.Color //> import java.awt.Color

clear()
setBackground(Color.black)
invisible()

var angle = 0.0 //> var angle: Double = 0.0

animate {
  clear()
  setBackground(Color.black)
  home()

  setPenColor(Color.cyan)
  setPenThickness(2)

  var i = 0
  while (i < 200) {
    forward(i * 2)
    right(91)
    i += 1
  }

  angle += 2
  right(angle)
} //> val res50: java.util.concurrent.Future[edu.umd.cs.piccolo.activities.PActivity] = net.kogics.kojo.util.FutureResult@647f39bf