Valentine Day

Valentine.swift

import UIKit
import XCPlayground

let a = 10


let layer = CAShapeLayer()
layer.strokeColor = UIColor.redColor().CGColor
layer.fillColor = UIColor(red: 1, green: 0.33, blue: 0.33, alpha: 1).CGColor
layer.lineWidth = 12
layer.lineCap = kCALineCapRound
layer.lineJoin = kCALineCapRound

let view = UIView(frame: CGRect(x: 0, y: 0, width: 640, height: 640 ))
view.layer.addSublayer(layer)

XCPlaygroundPage.currentPage.liveView = view

let points: [CGPoint] = 0.stride(to: M_PI * 2, by: 0.01).map {
    let x = pow(sin($0), 3)
    var y = 13 * cos($0)
    y -= 5 * cos(2 * $0)
    y -= 2 * cos(3 * $0)
    y -= cos(4 * $0)
    y /= 16

    return CGPoint(x: 380 + (x * 300), y: 320 + (y * -300))
}

let path = CGPathCreateMutable()

CGPathAddLines(path, nil, points, points.count)

layer.path = path

XCPlaygroundPage.currentPage.needsIndefiniteExecution = true

UIView.animateWithDuration(2, delay: 0, options: [.Repeat, .Autoreverse], animations: {
  view.transform = CGAffineTransformScale( view.transform , 1.2, 1.2)
  }, completion: nil)