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Points of a Clockface in Swift: Let the device compute the points of n
import SpriteKit
import XCPlayground
//SpriteKit and XCPlayground are required modules
//ZBeyer October 31st 2016
- Parameter size: The pixel size of the circle within the clock
- Parameter point: The x and y cooridantes within the scene where the circle will be placed
- Parameter scene: The scene in which the node will be placed
creates a SKShapeNode circle at a specified point within the specified scene
func nodeGenerator(size:CGFloat, point:CGPoint, scene:SKScene) -> SKShapeNode {
let c = SKShapeNode(circleOfRadius: size ) // Size of Circle
c.glowWidth = 1.0
c.fillColor =
c.position = point
return c
//Basic dimensions that we will use more later
let frame = CGRect(x: 0, y: 0, width: 320, height: 320)
//Center point of the frame
let midPoint = CGPoint(x: frame.size.width / 2.0, y: frame.size.height / 2.0)
//radius of the planned clockface
let r = (min(frame.height, frame.width)) * 0.618 * 0.5
//Create a scene, add something to it
var scene = SKScene(size: frame.size)
//Set up the view and show the scene
let view = SKView(frame: frame)
//Attatch the scene view to the live preview...
XCPlaygroundPage.currentPage.liveView = view
//Constant size of each node on the clock face
let kSize:CGFloat = 4
//Place a ClockFace node in the center
let clockFace:SKShapeNode = nodeGenerator(size:r, point: CGPoint( x:midPoint.x, y:midPoint.y), scene:scene)
clockFace.fillColor = SKColor.gray
//Place a normal node in the center
let centerNode:SKShapeNode = nodeGenerator(size:kSize, point: CGPoint( x:midPoint.x, y:midPoint.y), scene:scene)
//Determine radian spacing...
let nodesOnTheClock = 12
let interval:Double = 2 * M_PI / Double(nodesOnTheClock) //Radians
for index in 1...nodesOnTheClock {
let angle:Double = M_PI_2 - Double(index) * interval
let node:SKShapeNode = nodeGenerator(size: kSize,
point: CGPoint(
x:midPoint.x + r * cos(CGFloat(angle)),
y:midPoint.y + r * sin(CGFloat(angle))),
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