人文字みたいに、合図で点を円周上に整列させるiPhoneアプリのサンプルコードを描いてみます。
import UIKit
import SceneKit
class ViewController: UIViewController, SCNSceneRendererDelegate {
weak var sceneView : SCNView?
var letter = false
var last : NSTimeInterval = 0.0
override func viewDidLoad() {
super.viewDidLoad()
setupScene()
createGround()
createDots()
createCamera()
}
func setupScene() {
let sv = SCNView(frame: self.view.bounds)
sv.scene = SCNScene()
sv.delegate = self
sv.backgroundColor = UIColor(hue: 0.7, saturation: 0.2, brightness: 1, alpha: 1)
sv.scene?.physicsWorld.speed = 0;
view.addSubview(sv)
sceneView = sv
}
func createGround() {
let ground = SCNBox(width: 50, height: 1, length: 50, chamferRadius: 0)
ground.firstMaterial?.diffuse.contents = UIColor(hue: 0.2, saturation: 0.3, brightness: 1, alpha: 1)
let groundNode = SCNNode(geometry: ground)
groundNode.physicsBody = SCNPhysicsBody.dynamicBody()
groundNode.physicsBody?.velocityFactor = SCNVector3(x: 0, y: 0, z: 0)
groundNode.physicsBody?.allowsResting = false
sceneView?.scene?.rootNode.addChildNode(groundNode)
}
func createDots() {
for i in 0..<25 {
let x = Float(i % 5) * 10.0 – 20.0
let z = Float(i / 5) * 10.0 – 20.0
let dot = SCNSphere(radius: 0.5)
dot.firstMaterial?.diffuse.contents = UIColor(hue: 0, saturation: 0.7, brightness: 1, alpha: 1)
let node = SCNNode(geometry: dot)
node.name = “dot”
node.position = SCNVector3(x: x, y: 2, z: z)
sceneView?.scene?.rootNode.addChildNode(node)
}
}
func createCamera() {
let camera = SCNNode()
camera.camera = SCNCamera()
camera.camera?.zFar = 120
camera.position = SCNVector3(x: 0, y: 20, z: 90)
camera.rotation = SCNVector4(x: 1, y: 0, z: 0, w: –0.2)
sceneView?.scene?.rootNode.addChildNode(camera)
}
func renderer(aRenderer: SCNSceneRenderer, updateAtTime time: NSTimeInterval) {
if letter { return }
if last == 0 {
last = time
return
}
let interval = time – last
if interval >= 2.0 {
last = time
sceneView?.scene?.rootNode.childNodes
.filter { return ($0 as SCNNode).name == “dot” }
.map { (n : AnyObject) -> Void in
let x = Int(arc4random_uniform(50)) – 25
let z = Int(arc4random_uniform(50)) – 25
n.runAction(SCNAction.moveTo(SCNVector3(x: Float(x), y: 2, z: Float(z)), duration: 2.0))
return
}
}
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
sceneView?.scene?.physicsWorld.speed = 1.0
letter = !letter
if (letter) {
letter = true
let dots = sceneView?.scene?.rootNode.childNodes
.filter { return ($0 as SCNNode).name == “dot” }
let dAngle = 2.0 * M_PI / 25.0
for (i, c) in enumerate(dots!) {
let x = 20 * cos(dAngle * Double(i))
let z = 20 * sin(dAngle * Double(i))
c.runAction(SCNAction.moveTo(SCNVector3(x: Float(x), y: 2, z: Float(z)), duration: 2.0))
}
}
}
}