I'm having trouble adding new nodes into a scene where existing nodes are. When I add them I set the .position property to be the same, but they appear at the origin of the scene not at the position of the existing node.
I am building a very simple Asteroids-like game in SpriteKit. I have a method on my GameScene that adds asteroids:
// MARK: - Asteroids
func insertAsteroids(count: Int, size: AsteroidSize, newPosition: CGPoint?) {
for i in 0 ..< initialAsteroidCount {
let asteroid = Asteroid(size: size)
if let position = newPosition {
asteroid.position = position
} else {
asteroid.position = randomPositionOnScene()
}
self.addChild(asteroid)
}
}
and in my GameScene I call it like insertAsteroids(initialAsteroidCount, size: AsteroidSize.Big, newPosition: nil) with the newPosition set to nil so they go to a random place.
When I shoot an asteroid I have a contact handler that calls the same method, but slightly differently:
func didBeginContact(contact: SKPhysicsContact) {
[...]
//make new asteroids
if let newSize = oldAsteroid.smallerAsteroidSize() {
let newAsteroidCount = Int(arc4random_uniform(2)) + 2
self.insertAsteroids(newAsteroidCount, size: newSize, newPosition: oldAsteroid.position)
}
[...]
}
The crucial thing is oldAsteroid.position. I can println() the positions straight away after insertAsteroids() and see that they are the same but when they are displayed they appear in the lower left-hand corner of the scene (the origin).
Even if I force them into a known position they still appear at the origin:
self.insertAsteroids(newAsteroidCount, size: newSize, newPosition: CGPoint(x: 40, y: 50))
Have I made a mistake with the co-ordinate system, or is this to do with adding new nodes to a scene inside SKPhysicsContactDelegate methods?
