Border Class

Border.scala

/**
 * Tracks which border are present
 */
class Border(val underlying: Int) extends AnyVal {
  def remove(other: Border): Border = new Border(~other.underlying & underlying)
  def add(other: Border): Border = new Border(other.underlying | underlying)
  def hasTop: Boolean = ((underlying) & 1) == 1
  def hasLeft: Boolean = ((underlying >>> 1) & 1) == 1
  def hasRight: Boolean = ((underlying >>> 2) & 1) == 1
  def hasBottom: Boolean = ((underlying >>> 3) & 1) == 1

  override def toString: String = underlying match {
    case 0 => "Mid"
    case 15 => "All"
    case 1 => "Top"
    case 2 => "Left"
    case 3 => "Top-Left"
    case 4 => "Right"
    case _ => ???
  }
}

object Border {
  final val TOP = new Border(1)
  final val LEFT = new Border(2)
  final val RIGHT = new Border(4)
  final val BOTTOM = new Border(8)
  final val ALL = new Border(15)
  final val NONE = new Border(0)
}