Pfthb

I want to create line that have linked series of line segments that gets longer every seconds, and each time the user taps the direction of growth turns 90 degrees.

I finally managed to create at least some working prototype of my zig zag line.
My main idea is to initially create two points in the same position,
and then just move the end point in the desired direction. If the player changes the state of the line, then we add another point in the current head position.

Not sure if this was a good decision. Please give me some advise or maybe idea for more elegant solution.

For now I got this:

Here is my code:

//
// GameScene.swift
// Flarrow
//
// Created by Денис Андрейчук on 11/9/18.
// Copyright © 2018 Денис Андрейчук. All rights reserved.
//

import SpriteKit

class GameScene: SKScene 
 //For state control
 enum State 
 case moveUp
 case moveLeft
 case moveRight
 

 var currentState = State.moveUp
 var pathArray = [CGPoint]()
 let line = SKShapeNode()

 override func didMove(to view: SKView) 
 self.backgroundColor = .gray

 currentState = .moveUp

 pathArray.append(CGPoint(x: 0, y: -UIScreen.main.bounds.height))
 pathArray.append(CGPoint(x: 0, y: -UIScreen.main.bounds.height))
 createLine()
 

 //When user touch on screen, check for touch position, change state based on that
 //and add duplicate of current last point
 override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) 
 let touch = touches.first!
 let location = touch.location(in: self)

 if location.x > 0 
 currentState = .moveRight
 pathArray.append(pathArray[pathArray.endIndex - 1])
 else 
 currentState = .moveLeft
 pathArray.append(pathArray[pathArray.endIndex - 1])
 
 

 //Init line
 func createLine() 
 let path = CGMutablePath()
 path.move(to: pathArray[0])

 for point in pathArray 
 path.addLine(to: point)
 

 line.path = path
 line.fillColor = .clear
 line.lineWidth = 5
 line.strokeColor = .red

 self.addChild(line)
 

 //Update last point possition based on current state
 override func update(_ currentTime: TimeInterval) 
 let path = CGMutablePath()
 path.move(to: pathArray[0])

 switch currentState 
 case .moveUp:
 pathArray[1].y += 1
 case .moveLeft:
 pathArray[pathArray.endIndex - 1].y += 1
 pathArray[pathArray.endIndex - 1].x -= 1
 case .moveRight:
 pathArray[pathArray.endIndex - 1].y += 1
 pathArray[pathArray.endIndex - 1].x += 1
 

 for point in pathArray 
 path.addLine(to: point)
 

 line.path = path

 

In the last question I did not formulate my question very well, so now I described it in more detail.