pentagon rose

ViewController.swift

//
//  ViewController.swift
//  PentagonRose
//
//  Created by Mizushima Yusuke on 3/12/16.
//  Copyright © 2016 Yusuke Mizusima. All rights reserved.
//

import UIKit
import SpriteKit

class ViewController: UIViewController {

    weak var scene : SKScene?
    var yellowArr = [SKNode]()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupScene()
        createRose()
    }
    
    func setupScene() {
        let sv = SKView(frame: view.bounds)
        let s = SKScene(size: sv.frame.size)
        sv.presentScene(s)
        view.addSubview(sv)
        scene = s
    }
    
    func createRose() {
        self.view.backgroundColor = UIColor.greenColor()
        for i in 0...5 {
            let o = CGPoint(x: CGRectGetMidX(view.bounds), y: CGRectGetMidY(view.bounds))
            let r = Double(7 - i) * 30 * pow(0.8, Double(i))
            let red = createPentagonWithColor(r, color: .redColor())
            let yellow = createPentagonWithColor(r, color: .yellowColor())
            red.position = o
            yellow.position = o
            self.scene?.addChild(red)
            self.scene?.addChild(yellow)
            
            red.zRotation = -CGFloat(M_PI / 12.0) * CGFloat(i)
            yellow.zRotation = red.zRotation

            yellowArr.append(yellow)
        }
    }

    func createPentagonWithColor(radius : Double, color : UIColor) -> SKNode {
        let dw = M_PI / 2.5
        let path = UIBezierPath()
        for i in 0...4 {
            let x = radius * cos(Double(i) * dw)
            let y = radius * sin(Double(i) * dw)
            if i == 0 {
                path.moveToPoint(CGPoint(x: x, y: y))
            } else {
                path.addLineToPoint(CGPoint(x: x, y: y))
            }
        }
        path.closePath()
        let pentagon = SKShapeNode()
        pentagon.path = path.CGPath
        pentagon.fillColor = color
        pentagon.lineWidth = 1
        pentagon.strokeColor = UIColor.whiteColor()
        return pentagon
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        yellowArr.enumerate().forEach {
            $1.runAction(SKAction.sequence([
                SKAction.waitForDuration(Double($0)),
                SKAction.group([
                SKAction.scaleBy(0.86, duration: 1.0),
                SKAction.rotateByAngle(CGFloat(M_PI) / 12.0, duration: 1.0)
                ])
            ]))
        }
    }
}

http://lepetit-prince.net/ios/?p=4925