Created
January 11, 2017 11:08
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it's a ball that rotates
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| //: Playground - noun: a place where people can play | |
| import UIKit | |
| import XCPlayground | |
| import SpriteKit | |
| class FourColorCircle : SKNode { | |
| override init() { | |
| super.init() | |
| self.createCircle() | |
| } | |
| required init?(coder aDecoder: NSCoder) { | |
| super.init(coder: aDecoder) | |
| } | |
| func createCircle () { | |
| let center = CGPoint(x:self.frame.midX, y:self.frame.midY) | |
| // node1 | |
| let node1bezierPath = UIBezierPath() | |
| node1bezierPath.addArc(withCenter: center, radius: 100, startAngle: 0.78, endAngle: 2.35, clockwise: true) | |
| node1bezierPath.addLine(to: center) | |
| let node1 = SKShapeNode(path: node1bezierPath.cgPath) | |
| node1.strokeColor = SKColor.red | |
| node1.fillColor = SKColor.red | |
| self.addChild(node1) | |
| // node2 | |
| let node2bezierPath = UIBezierPath() | |
| node2bezierPath.addArc(withCenter: center, radius: 100, startAngle: 2.35, endAngle: 3.92, clockwise: true) | |
| node2bezierPath.addLine(to: center) | |
| let node2 = SKShapeNode(path: node2bezierPath.cgPath) | |
| node2.strokeColor = SKColor.blue | |
| node2.fillColor = SKColor.blue | |
| self.addChild(node2) | |
| // node3 | |
| let node3bezierPath = UIBezierPath() | |
| node3bezierPath.addArc(withCenter: center, radius: 100, startAngle: 3.92, endAngle: 5.48, clockwise: true) | |
| node3bezierPath.addLine(to: center) | |
| let node3 = SKShapeNode(path: node3bezierPath.cgPath) | |
| node3.strokeColor = SKColor.green | |
| node3.fillColor = SKColor.green | |
| self.addChild(node3) | |
| // node4 | |
| let node4bezierPath = UIBezierPath() | |
| node4bezierPath.addArc(withCenter: center, radius: 100, startAngle: 5.48, endAngle: 0.78, clockwise: true) | |
| node4bezierPath.addLine(to: center) | |
| let node4 = SKShapeNode(path: node4bezierPath.cgPath) | |
| node4.strokeColor = SKColor.yellow | |
| node4.fillColor = SKColor.yellow | |
| self.addChild(node4) | |
| } | |
| func rotate(angle : CGFloat, animated : Bool) { | |
| var rotateAction : SKAction! | |
| if animated { | |
| rotateAction = SKAction.rotate(byAngle: angle, duration: 0.6) | |
| } | |
| else { | |
| rotateAction = SKAction.rotate(byAngle: angle, duration: 0) | |
| } | |
| self.run(rotateAction) | |
| } | |
| } | |
| var nyanCat = FourColorCircle() | |
| //Basic dimensions that we will use more later | |
| let frame = CGRect(x: 0, y: 0, width: 640, height: 512) | |
| let midPoint = CGPoint(x: frame.size.width / 2.0, y: frame.size.height / 2.0) | |
| //Create a scene, add something to it | |
| var scene = SKScene(size: frame.size) | |
| //let nyanCat = SKSpriteNode(imageNamed: "Nyancat") | |
| nyanCat.position = midPoint | |
| nyanCat.setScale(1.0) | |
| scene.addChild(nyanCat) | |
| //Set up the view and show the scene | |
| let view = SKView(frame: frame) | |
| view.presentScene(scene) | |
| XCPlaygroundPage.currentPage.liveView = view | |
| scene.physicsWorld.gravity = CGVector(dx: 0, dy: 0.0) | |
| nyanCat.physicsBody = SKPhysicsBody(circleOfRadius: 60 / 2.0) | |
| nyanCat.physicsBody?.allowsRotation = true | |
| nyanCat.physicsBody?.friction = 0.9 | |
| nyanCat.physicsBody?.applyAngularImpulse(0.04) | |
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