[CGPoint+offsetBy] Extends `offsetBy` method to `CGPoint`. #extension #iOS

CGPoint+offsetBy.swift

//
//  CGPoint+offsetBy.swift
//
//  Created by Jay Lee on 29/01/2019.
//  Copyright © 2019 Jay Lee <jaeho.lee@snu.ac.kr>
//  This work is free. You can redistribute it and/or modify it under the
//  terms of the Do What The Fuck You Want To Public License, Version 2,
//  as published by Sam Hocevar. See http://www.wtfpl.net/ for more details.
//

import UIKit

extension CGPoint {
  /// Retuns the point which is an offset of an existing point.
  ///
  /// - Parameters:
  ///   - dx: The x-coordinate offset to apply.
  ///   - dy: The y-coordinate offset to apply.
  ///
  /// - Returns:
  ///   A new point which is an offset of an existing point.
  func offsetBy(dx: CGFloat, dy: CGFloat) -> CGPoint {
    return CGPoint(x: x + dx, y: y + dy)
  }
}