開閉するパラボラのiPhoneアプリ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 count = 0
override func viewDidLoad() {
super.viewDidLoad()
setupScene()
createParabola()
createCamera()
}
func setupScene() {
sceneView = {
let sv = SCNView(frame: self.view.bounds)
sv.backgroundColor = UIColor(hue: 0.6, saturation: 0.1, brightness: 0.5, alpha: 1)
sv.scene = SCNScene()
sv.scene?.physicsWorld.speed = 5
sv.delegate = self
sv.autoenablesDefaultLighting = true
sv.allowsCameraControl = true
self.view?.addSubview(sv)
return sv
}();
}
func createParabola() {
var pt = {(i : Int) -> CGPoint in CGPoint(x:CGFloat(i), y:CGFloat(pow(Double(i), 2)) / 50.0)}
let path = UIBezierPath()
path.moveToPoint(CGPoint(x: –50, y: 50))
[Int](-50…50).each { i in path.addLineToPoint(pt(i)) }
[Int](-50…50).back { i in path.addLineToPoint(CGPoint(x:pt(i).x, y:pt(i).y + 1)) }
let parabola = SCNShape(path: path, extrusionDepth: 0.5)
[Int](0…360).each { i in
let parabolaNode = SCNNode(geometry: parabola)
parabolaNode.name = “parabola”
parabolaNode.physicsBody = SCNPhysicsBody.staticBody()
parabolaNode.physicsBody?.physicsShape = SCNPhysicsShape(node: parabolaNode, options: [SCNPhysicsShapeTypeKey : SCNPhysicsShapeTypeConcavePolyhedron])
self.sceneView?.scene?.rootNode.addChildNode(parabolaNode)
}
}
func createCamera() {
let camera = SCNNode()
camera.camera = SCNCamera()
camera.camera?.zFar = 600
camera.position = SCNVector3(x: 0, y: 0, z: 400)
sceneView?.scene?.rootNode.addChildNode(camera)
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
var doit = {(i : Int, e : AnyObject) -> Void in (e as SCNNode).runAction(SCNAction.rotateToX(0, y: CGFloat(i) * CGFloat(M_PI) / 360.0, z: 0, duration: 0.5))}
if count != 0 {
doit = {(i : Int, e : AnyObject) -> Void in (e as SCNNode).runAction(SCNAction.rotateToX(0, y: 0, z: 0, duration: 0.5))}
}
sceneView?.scene?.rootNode.childNodes
.filter {($0 as SCNNode).name == “parabola” }.eachIdx (doit)
count = (count + 1) % 2
}
func renderer(aRenderer: SCNSceneRenderer, updateAtTime time: NSTimeInterval) {
if arc4random() % 50 == 0 {
let ball = SCNSphere(radius: 8)
ball.firstMaterial?.diffuse.contents = UIColor.orangeColor()
let ballNode = SCNNode(geometry: ball)
ballNode.position = SCNVector3(x: 0, y: 80, z: 100)
self.sceneView?.scene?.rootNode.addChildNode(ballNode)
ballNode.physicsBody = SCNPhysicsBody.dynamicBody()
ballNode.physicsBody?.applyForce(SCNVector3(x: 0, y: –30, z: –100), impulse: true)
}
}
}
extension Array {
func each(doit:(T) -> Void) { for i in self { doit(i) } }
func back(doit:(T) -> Void) { for (var i=self.count–1; i>=0; i–) { doit(self[i]) } }
func eachIdx(doit:(Int, T) -> Void) { for (idx, e) in enumerate(self) { doit(idx, e) } }
}