CGPath के साथ आधा सर्कल पथ बनाना, और SKAction

Question

के साथ पथ का पालन करें मुझे नहीं पता कि CGPath के साथ आधा सर्कल पथ कैसे बनाया जाए।

let path = CGPathCreateMutable() 
    let Width: CGFloat = 38.0 
    let radius: CGFloat = (Width/2.0) + (Treshold/2.0) 
    CGPathAddArc(pathOne, nil, x, 0.0, radius, firstPoint.position.x, secondPoint.position.x, true) 
    let waitAction = SKAction.waitForDuration(1.0) 
    let moveAction = SKAction.followPath(pathOne, duration: 3.0) 
    capOne.runAction(SKAction.sequence([waitAction, moveAction])) 

Answer 1

import SpriteKit 

class GameScene: SKScene, SKPhysicsContactDelegate { 

    override init(size: CGSize) { 
     super.init(size: size) 
     let square = SKSpriteNode(color: SKColor.redColor(), size: CGSizeMake(20, 20)) 
     square.position = CGPointMake(self.size.width/2, self.size.height/2) 
     addChild(square) 

     let bezierPath = UIBezierPath(arcCenter: CGPointMake(0, 0), radius: 100, startAngle: CGFloat(M_PI_2), endAngle: CGFloat(-M_PI_2), clockwise: false) 

     let pathNode = SKShapeNode(path: bezierPath.CGPath) 
     pathNode.strokeColor = SKColor.blueColor() 
     pathNode.lineWidth = 3 
     pathNode.position = square.position 
     addChild(pathNode) 

     square.runAction(SKAction.followPath(bezierPath.CGPath, asOffset: true, orientToPath: true, duration: 2)) 
    } 

    required init?(coder aDecoder: NSCoder) { 
     fatalError("init(coder:) has not been implemented") 
    } 
}