Moving a sprite with a joystick in swift Xcode - xcode

Question

hello :D I have this code below.
import SpriteKit
class GameScene: SKScene {
let base = SKSpriteNode(imageNamed: "yellowArt/Base")
let ball = SKSpriteNode(imageNamed: "yellowArt/Ball")
let ship = SKSpriteNode(imageNamed: "yellowArt/Ship")
var stickActive:Bool = false
override func didMoveToView(view: SKView) {
self.backgroundColor = SKColor.blackColor()
self.anchorPoint = CGPointMake(0.5, 0.5)
self.addChild(base)
base.position = CGPointMake(0, -200)
self.addChild(ball)
ball.position = base.position
self.addChild(ship)
ship.position = CGPointMake(0, 200)
ball.alpha = 0.4
base.alpha = 0.4
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
for touch in (touches ) {
let location = touch.locationInNode(self)
if (CGRectContainsPoint(ball.frame, location)) {
stickActive = true
} else {
stickActive = false
}
}
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
for touch in (touches ) {
let location = touch.locationInNode(self)
if (stickActive == true) {
let v = CGVector(dx: location.x - base.position.x, dy: location.y - base.position.y)
let angle = atan2(v.dy, v.dx)
let deg = angle * CGFloat( 180 / M_PI)
print( deg + 180 )
let length: CGFloat = base.frame.size.height / 2
let xDist: CGFloat = sin(angle - 1.57079633) * length
let yDist: CGFloat = cos(angle - 1.57079633) * length
if (CGRectContainsPoint(base.frame, location)) {
ball.position = location
} else {
ball.position = CGPointMake(base.position.x - xDist, base.position.y + yDist)
ship.zRotation = angle - 1.57079633
ship.position = CGPointMake(angle, angle)
}
} // ends stick active test
}
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
if (stickActive == true) {
let move: SKAction = SKAction.moveTo(base.position, duration: 0.2)
move.timingMode = .EaseOut
ball.runAction(move)
}
}
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
}
}
The code above creates a joystick and a ship. By moving the joystick I am able to rotate the "ship" with the joystick. However I want to move the ship in the direction that the joystick is holding. How do I tackle this problem? Thanks.

Answer 1

Your ship isn't going to go anywhere since you have ship.position = CGPointMake(angle, angle). As long as you're moving the joystick, the ship is going to go to that point - remove that line.
I would use the update method to move the ship around. First you need to find how much you want to move it in the x and y direction.
Create class variables for the joystick movements below your var stickActive:Bool = false statement:
var xJoystickDelta = CGFloat()
var yJoystickDelta = CGFloat()
Put the following code in your touchesMoved method:
xJoystickDelta = location.x - base.position.x
yJoystickDelta = location.y - base.position.y
Put the following code in your update method:
let xScale = 1.0 //adjust to your preference
let yScale = 1.0 //adjust to your preference
let xAdd = xScale * self.xJoytickDelta
let yAdd = yScale * self.yJoystickDelta
self.ship.position.x += xAdd
self.ship.position.y += yAdd
I hope this helps.