/// Copyright (c) 2020 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import UIKit

extension UIView {
  /// angle in radians
  func pointWithCenter(center: CGPoint, radius: CGFloat, angle: CGFloat) -> CGPoint {
    let deltax = radius * cos(angle)
    let deltay = radius * sin(angle)
    let newpoint = CGPoint(x: center.x + deltax, y: center.y + deltay)
    return newpoint
  }

  func angleFrom(start: CGPoint, end: CGPoint) -> CGFloat {
    var deltax = end.x - start.x
    let deltay = end.y - start.y
    if abs(deltax) < 0.001 {
      deltax = 0.001
    }
    let  angle = atan(deltay / abs(deltax))
    return deltax > 0 ? angle : CGFloat.pi - angle
  }

  func distanceFrom(start: CGPoint, end: CGPoint) -> CGFloat {
    let deltax = end.x - start.x
    let deltay = end.y - start.y

    return sqrt(pow(deltax, 2) + pow(deltay, 2))
  }
}
