坂道をつくって車をゴールに向かわせるiPhoneアプリのサンプルコードを描いてみます。
import UIKit
import SpriteKit
class ViewController: UIViewController, SKSceneDelegate {
weak var scene : SKScene?
weak var selectObj : SKNode?
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
self.setupScene()
self.createObjects()
self.createCar()
}
func setupScene() {
var spriteView = SKView(frame: self.view.bounds)
var scene = SKScene(size: spriteView.frame.size)
scene.backgroundColor = UIColor(hue: 0.15, saturation: 0.5, brightness: 0.5, alpha: 1)
spriteView.presentScene(scene)
self.view.addSubview(spriteView)
self.scene = spriteView.scene
self.scene?.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.view.bounds)
self.scene?.delegate = self
}
func createObjects() {
var triangle = { (o : CGPoint) -> SKNode in
let path = UIBezierPath()
for p in [CGPoint(x: –30, y: –30), CGPoint(x: 30, y: 30), CGPoint(x: 30, y: –30)] {
if(p.x == –30) { path.moveToPoint(p) }
else { path.addLineToPoint(p) }
}
var triangle = SKShapeNode(path: path.CGPath)
triangle.name = “object”
triangle.fillColor = UIColor(hue: 0.2, saturation: 0.3, brightness: 0.8, alpha: 1)
triangle.position = o
self.scene?.addChild(triangle)
triangle.physicsBody = SKPhysicsBody(polygonFromPath: path.CGPath)
triangle.physicsBody?.friction = 0.8
return triangle
}
var box = { (o:CGPoint) -> SKNode in
var rectangle = SKSpriteNode(color: UIColor(hue: 0.3, saturation: 0.3, brightness: 0.8, alpha: 1), size: CGSize(width: 60, height: 60))
rectangle.name = “object”
rectangle.position = o
self.scene?.addChild(rectangle)
rectangle.physicsBody = SKPhysicsBody(rectangleOfSize: rectangle.size)
return rectangle
}
var checker = SKSpriteNode(color: UIColor.whiteColor(), size: CGSizeMake(120, 60))
checker.position = CGPoint(x: CGRectGetMaxX(self.view.bounds) – 80.0, y: 180.0)
checker.name = “checker”
self.scene?.addChild(checker)
for i in 0..<32 {
if (i + i / 8) % 2 == 0 {continue}
var n = SKSpriteNode(color:UIColor.blackColor(), size:CGSize(width: 16.0, height: 16.0))
n.position = CGPoint(x: (i%8) * 15 – 52, y: (i/8) * 15 – 22)
checker.addChild(n)
}
triangle(CGPoint(x: 250, y: 50))
triangle(CGPoint(x: 370, y: 80))
triangle(CGPoint(x: 420, y: 150))
box(CGPoint(x: 450, y: 80))
box(CGPoint(x: 450, y: 150))
box(CGPoint(x: 200, y: 100))
box(CGPoint(x: 250, y: 160))
}
func createCar() {
var car = SKSpriteNode(color: UIColor.redColor(), size: CGSize(width: 40, height: 20))
car.name = “car”
car.position = CGPoint(x: 50, y: 50)
car.physicsBody = SKPhysicsBody(rectangleOfSize: car.size)
self.scene?.addChild(car)
for i in 0..<2 {
var tire = SKShapeNode(circleOfRadius: 10)
tire.name = “tire”
tire.position = CGPoint(x: –20 + i*40 , y: –10)
tire.fillColor = UIColor.blackColor()
car.addChild(tire)
tire.physicsBody = SKPhysicsBody(circleOfRadius: 10)
tire.physicsBody?.friction = 0.8
var joint = SKPhysicsJointPin.jointWithBodyA(car.physicsBody, bodyB: tire.physicsBody, anchor: CGPoint(x:30 + i*40, y:40))
self.scene?.physicsWorld.addJoint(joint)
}
}
func update(currentTime: NSTimeInterval, forScene scene: SKScene) {
self.scene?.enumerateChildNodesWithName(“car”, usingBlock: { (n, b) -> Void in
let car : SKNode = n
for ch in [car.children[0], car.children[1]] {
let tire : SKNode = ch as SKNode
if tire.physicsBody?.velocity.dx < 5 {
car.physicsBody?.velocity = CGVectorMake(35, car.physicsBody!.velocity.dy)
tire.physicsBody?.applyTorque(-100)
}
}
})
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
var p = touches.anyObject()!.locationInNode(self.scene)
self.scene?.enumerateChildNodesWithName(“object”, usingBlock: { (n :SKNode!, b:UnsafeMutablePointer<ObjCBool>) -> Void in
if n.containsPoint(p) {
n.physicsBody?.dynamic = false
self.selectObj = n
}
})
}
override func touchesMoved(touches: NSSet, withEvent event: UIEvent) {
var p = touches.anyObject()!.locationInNode(self.scene)
if let node = self.selectObj {
node.position = p
}
}
override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
if let node = self.selectObj {
node.physicsBody?.dynamic = true
}
}
}