Support animation direction

[cruisediary]

ISSDUE #2

AS IS

• ONLY TOP-RIGHT to BOTTOM-LEFT

TO BE

• Add Direction Enum

enum Point {
  case left
  case top
  case right
  case bottom
  case topLeft
  case topRight
  case bottomLeft
  case bottomRight
  case custom(position: CGPoint)
}

EXAMPLE

  pastelView.startPoint = .left
  pastelView.endPoint = .custom(CGPoint(x: 0.8, y: 1.0))