img atlas based game swift

atlas_based_game.swift

class GameScene: SKScene {
    
    private var label : SKLabelNode?
    private var spinnyNode : SKShapeNode?
    private var playerNode : SKSpriteNode!
    private var upImgs : [SKTexture]!
    private var downImgs : [SKTexture]!
    private var rightImgs : [SKTexture]!
    private var leftImgs : [SKTexture]!
    
    override func didMove(to view: SKView) {
        
        let atlas = SKTextureAtlas(named: "player")
        let f1 = atlas.textureNamed("tile_0_0.png")
        let f2 = atlas.textureNamed("tile_0_1.png")
        let f3 = atlas.textureNamed("tile_0_2.png")
        let f4 = atlas.textureNamed("tile_0_3.png")
        let f5 = atlas.textureNamed("tile_0_4.png")
        let f6 = atlas.textureNamed("tile_0_5.png")
        let f7 = atlas.textureNamed("tile_0_6.png")
        let f8 = atlas.textureNamed("tile_0_7.png")
        let f9 = atlas.textureNamed("tile_0_8.png")
        let f10 = atlas.textureNamed("tile_0_9.png")
        let f11 = atlas.textureNamed("tile_0_10.png")
        let f12 = atlas.textureNamed("tile_0_11.png")
        let f13 = atlas.textureNamed("tile_0_12.png")
        let f14 = atlas.textureNamed("tile_0_13.png")
        let f15 = atlas.textureNamed("tile_0_14.png")
        let f16 = atlas.textureNamed("tile_0_15.png")
        
        downImgs = [f1, f2, f3, f4]
        rightImgs = [f5, f6, f7, f8]
        upImgs = [f9, f10, f11, f12]
        leftImgs = [f13, f14, f15, f16]
        
        playerNode = SKSpriteNode(texture: f1)
        playerNode.position = CGPoint(x: 0, y: 0)
        playerNode.physicsBody = SKPhysicsBody()
        playerNode.physicsBody!.affectedByGravity = false
        addChild(playerNode)
        
        // Get label node from scene and store it for use later
        self.label = self.childNode(withName: "//helloLabel") as? SKLabelNode
        if let label = self.label {
            label.alpha = 0.0
            label.run(SKAction.fadeIn(withDuration: 2.0))
        }
        
        // Create shape node to use during mouse interaction
        let w = (self.size.width + self.size.height) * 0.05
        self.spinnyNode = SKShapeNode.init(rectOf: CGSize.init(width: w, height: w), cornerRadius: w * 0.3)
        
        if let spinnyNode = self.spinnyNode {
            spinnyNode.lineWidth = 2.5
            
            spinnyNode.run(SKAction.repeatForever(SKAction.rotate(byAngle: CGFloat(Double.pi), duration: 1)))
            spinnyNode.run(SKAction.sequence([SKAction.wait(forDuration: 0.5),
                                              SKAction.fadeOut(withDuration: 0.5),
                                              SKAction.removeFromParent()]))
        }
    }
    
    
    func touchDown(atPoint pos : CGPoint) {
        if let n = self.spinnyNode?.copy() as! SKShapeNode? {
            n.position = pos
            n.strokeColor = SKColor.green
            self.addChild(n)
        }
        
        let posDiff = CGPoint(x: playerNode.position.x - pos.x, y: playerNode.position.y - pos.y)
        var imgSet:[SKTexture] = []
        //print(posDiff)
        
        if posDiff.x < 0 {
            if posDiff.y < 0 {
                imgSet = upImgs
            } else {
                imgSet = rightImgs
            }
        } else {
            if posDiff.y < 0 {
                imgSet = leftImgs
            } else {
                imgSet = downImgs
            }
        }
        
        let moving =  SKAction.move(to: pos, duration: 2)
        
        
        let animate = SKAction.repeatForever(.animate(with: imgSet,
                                       timePerFrame: 0.2,
                                       resize: false,
                                       restore: true))
        playerNode.run(animate, withKey: "animate")
        let block = SKAction.run {
            self.playerNode.removeAction(forKey: "animate")
        }
        playerNode.run(SKAction.sequence([moving, block]))
        
        
    }
}