数学...ずっと避け続けてきたけど、どうしても乗り越えなければならない壁っぽいので、ちょっとずつ勉強。。 サンプル タップした方向に三角形を回転させる。 import SpriteKit class GameScene: SKScene { var triangle: SKShapeNode! override func didMoveToView(view: SKView) { self.backgroundColor = UIColor.whiteColor() //三角形を作る let length: CGFloat = 100 var points = [CGPoint(x:length, y:-length / 2.0), CGPoint(x:-length, y:-length / 2.0), CGPoint(x: 0.0, y: length), CGPoint(x:leng
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