ボールに絵を貼付ける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 {
weak var scene : SCNScene?
weak var paintView : UIView?
weak var shape : CAShapeLayer?
var drawColor = UIColor.whiteColor()
override func viewDidLoad() {
super.viewDidLoad()
self.createPaintTool()
self.setupScene()
self.createCamera()
self.createButton()
}
func createPaintTool() {
let w = CGRectGetMaxX(self.view.bounds)
let h = CGRectGetMidY(self.view.bounds)
let paintv = UIView(frame: CGRect(x: 0, y: h, width: w, height: h))
paintv.backgroundColor = UIColor(hue: 0.6, saturation: 0.8, brightness: 0.4, alpha: 1)
self.view.addSubview(paintv)
self.paintView = paintv
for i in 0..<4 {
let x : CGFloat = CGFloat(i) * 40 + 10
let y = h – 40 – 10
let color = UIView(frame: CGRect(x: x, y: y, width: 40, height: 40))
color.layer.cornerRadius = 20
color.backgroundColor = UIColor(hue: CGFloat(i) * 0.2, saturation: 0.3, brightness: 1, alpha: 1)
paintv.addSubview(color)
}
}
func setupScene() {
let w = CGRectGetMaxX(self.view.bounds)
let sv = SCNView(frame: CGRectMake(0, 0, w, w))
sv.scene = SCNScene()
sv.backgroundColor = UIColor(hue: 0.3, saturation: 0.8, brightness: 0.7, alpha: 1)
self.view.addSubview(sv)
self.scene = sv.scene
let box = SCNBox(width: 30, height: 1, length: 80, chamferRadius: 0)
box.firstMaterial?.diffuse.contents = UIColor.lightGrayColor()
let boxNode = SCNNode(geometry: box)
boxNode.position = SCNVector3(x: 0, y: 0, z: –40)
self.scene?.rootNode.addChildNode(boxNode)
boxNode.physicsBody = SCNPhysicsBody.staticBody()
}
func createCamera() {
let camera = SCNNode()
camera.camera = SCNCamera()
camera.camera?.zFar = 200
camera.position = SCNVector3(x: 0, y: 10, z: 40)
self.scene?.rootNode.addChildNode(camera)
}
func createButton() {
let btn = UIButton.buttonWithType(.System) as UIButton
btn.setTitle(“Go”, forState: .Normal)
btn.titleLabel?.font = UIFont.boldSystemFontOfSize(40)
btn.sizeToFit()
btn.center = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds))
self.view.addSubview(btn)
btn.addTarget(self, action: “go”, forControlEvents: .TouchUpInside)
}
func go() {
let ball = SCNSphere(radius: 10)
UIGraphicsBeginImageContext(self.paintView!.frame.size);
self.paintView!.layer.renderInContext(UIGraphicsGetCurrentContext());
let screenshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
ball.firstMaterial?.diffuse.contents = screenshot
let ballNode = SCNNode(geometry: ball)
ballNode.physicsBody = SCNPhysicsBody.dynamicBody()
ballNode.physicsBody?.applyForce(SCNVector3(x: 0, y: 4, z: –20), atPosition: SCNVector3(x: 0, y: 5, z: 5), impulse: true)
ballNode.position = SCNVector3(x: 0, y: 30, z: 0)
self.scene?.rootNode.addChildNode(ballNode)
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, Int64(10.0 * Double(NSEC_PER_SEC))),
dispatch_get_main_queue(), { ballNode.removeFromParentNode() })
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
let p = touches.anyObject()!.locationInView(self.paintView)
if let hit = self.paintView?.hitTest(p, withEvent: nil) {
let sl = CAShapeLayer()
sl.frame = self.paintView!.bounds
let path = UIBezierPath()
path.moveToPoint(p)
sl.path = path.CGPath
self.paintView?.layer.addSublayer(sl)
if hit != self.paintView {
// color change
self.drawColor = hit.backgroundColor!
}
sl.strokeColor = self.drawColor.CGColor
sl.fillColor = UIColor.clearColor().CGColor
sl.lineWidth = 8
self.shape = sl
}
}
override func touchesMoved(touches: NSSet, withEvent event: UIEvent) {
let p = touches.anyObject()!.locationInView(self.paintView)
if let hit = self.paintView?.hitTest(p, withEvent: nil) {
let path = CGPathCreateMutableCopy(self.shape?.path)
CGPathAddLineToPoint(path, nil, p.x, p.y)
self.shape?.path = path
}
}
}