I´ve made a game with SpriteKit with different bricks falling down on a hill. When these physical bodies fall down they usually bounce off the hill and change their alignment(they spin a couple of times). If I transition to the GameOver scene and press replay(back to the GameScene) the physics bodies are still aligned like when I left the scene. But I want them to have a horizontal alignment like in the beginning.
GameScene:
import SpriteKit
import GameplayKit
let hillTexture = SKTexture(imageNamed: "HillIllustration")
let hillIllustration = SKSpriteNode(texture: hillTexture)
let brickTexture = SKTexture(imageNamed: "BrickIllustration")
let brick = SKSpriteNode(texture: brickTexture)
class GameScene: SKScene {
//Hill
hillIllustration.setScale(0.7)
hillIllustration.position = CGPoint(x: self.size.width / 2, y: self.size.height * 0.16)
hillIllustration.zPosition = 2
hillIllustration.physicsBody = SKPhysicsBody(polygonFrom: clipPath)
hillIllustration.physicsBody?.isDynamic = false
hillIllustration.physicsBody?.categoryBitMask = CollisionBitMask.Hill
hillIllustration.physicsBody?.affectedByGravity = false
self.addChild(hillIllustration)
//The brick is a child of the hill node
brick.setScale(1)
brick.position = CGPoint(x: -350, y: self.size.height * 0.5)
brick.zPosition = 1
brick.physicsBody = SKPhysicsBody(polygonFrom: clipPath2)
brick.physicsBody?.isDynamic = true
brick.physicsBody?.categoryBitMask = CollisionBitMask.Brick
brick.physicsBody?.affectedByGravity = true
hillIllustration.addChild(brick)
}
Transition to GameOver:
let transition = SKTransition.crossFade(withDuration: 0)
let gameScene = GameOver(size: self.size)
self.view?.presentScene(gameScene, transition: transition)
Transition back to GameScene:
let transition = SKTransition.crossFade(withDuration: 0)
let gameScene = GameScene(size: self.size)
self.view?.presentScene(gameScene, transition: transition)
Somehow when I transition scenes the information of how the bricks were aligned gets saved. How can I change that?
if you want that after you restart the game the brick node go back to start rotation than call:
brick.zRotation = 0
if you want that during the game the node do not rotate than you may put this code in the update func that already have in all spritekit files:
override func update(_ currentTime: TimeInterval) {
brick.zRotation = 0
}
Hope this helps
Related
I am creating a 2D macOS game using SpriteKit and I want a continuous scrolling background from left to right.
I have a background image that is the same size as my frame. The image is duplicated side-by-side: initially the left one is centred and the right is off-screen. Both images (SKSpriteNode) are animated to slide across the screen and then reset their positions once moved by a full frame-width.
Here is the relevant code:
import SpriteKit
import GameplayKit
class GameScene: SKScene {
private var background = SKSpriteNode()
func makeBackground() {
let texture = SKTexture(imageNamed: "bg-empty")
let scroll = SKAction.move(by: CGVector(dx: -texture.size().width, dy: 0), duration: 30)
let reset = SKAction.move(by: CGVector(dx: texture.size().width, dy: 0), duration: 0)
let animation = SKAction.repeatForever(SKAction.sequence([scroll, reset]))
for idx in 0...1 {
background = SKSpriteNode(texture: texture)
background.position = CGPoint(x: CGFloat(idx)*texture.size().width, y: self.frame.midY)
background.zPosition = -1
background.run(animation)
self.addChild(background)
}
}
override func didMove(to view: SKView) {
makeBackground()
}
}
Although this works, I notice a black (~1 pixel vertical strip) flicker that appears ad-hoc at the seam of the connection.
What is causing this flicker and how do I get rid of it?
You are encountering floating point rounding errors. This is going to lead to a situation where your first BG rounds down, and your second BG rounds up, giving you a 1 pixel gap.
instead, try the following code
class GameScene: SKScene {
private var background = SKNode()
func makeBackground() {
let texture = SKTexture(imageNamed: "bg-empty")
let scroll = SKAction.move(by: CGVector(dx: -texture.size().width, dy: 0), duration: 30)
let reset = SKAction.move(by: CGVector(dx: texture.size().width, dy: 0), duration: 0)
let animation = SKAction.repeatForever(SKAction.sequence([scroll, reset]))
for idx in 0...1 {
let subNode = SKSpriteNode(texture: texture)
subNode.position = CGPoint(x: CGFloat(idx)*texture.size().width, y: self.frame.midY)
background.addChild(subNode)
}
background.zPosition = -1
background.run(animation)
self.addChild(background)
}
override func didMove(to view: SKView) {
makeBackground()
}
}
Now you can avoid the gap because you are not running 2 different actions.
If you want to be able to scroll both ways. then place a texture to the left of your bg.
This will place a background node before and after your main background, and essentially turn it into 1 big node, with only the middle texture showing in its entirety.
If you have multiple background images, then just place the last frame of your background also to the left
I'm having a difficult time trying to figure out how to get my SceneKit camera to orbit around a specific node in my game.
If I have a single node (a ship) and a camera in my scene everything works fine. If I add an additional node (a planet) the cameras pivot point appears to change from my ship to a space between my ship and planet.
Things I've tried:
Setting a lookat constraint on my camera (set to the ship)
Settingcamera position to my ship (it will move but the pivot point
still seems to be between the two objects)
Changing the cameras pivot point
example:
class TestSceneViewController: UIViewController, SCNSceneRendererDelegate {
var scnView: SCNView = SCNView()
var scnScene: SCNScene!
var cameraNode: SCNNode!
var ship: SCNNode!
override func viewDidLoad() {
super.viewDidLoad()
setupView()
setupScene()
setupCamera()
...
func setupView() {
// scnView = self.view as! SCNView
// retrieve the SCNView
scnView = SCNView(frame: view.frame)
scnView.showsStatistics = true
view.addSubview(scnView)
scnView.allowsCameraControl = true
scnView.defaultCameraController.interactionMode = .orbitTurntable
scnView.defaultCameraController.inertiaEnabled = true
scnView.delegate = self
scnView.isPlaying = true
scnView.loops = true
}
func setupScene () {
scnScene = SCNScene()
scnView.scene = scnScene
let ships = SCNScene(named: "art.scnassets/simpleshuttle3.scn")
ship = ships!.rootNode.childNode(withName: "ship", recursively: true)
ship?.position = SCNVector3(x: 0, y: 0, z: 0)
scnScene.rootNode.addChildNode(ship!)
let planets = SCNScene(named: "art.scnassets/sphere.scn")!
if let planet = planets.rootNode.childNode(withName: "Ball", recursively: true){
planet.position = SCNVector3(x: 0, y: 0, z: 40)
scnScene.rootNode.addChildNode(planet)
}
}
func setupCamera() {
cameraNode = SCNNode()
cameraNode.camera = SCNCamera()
cameraNode.position = SCNVector3(x: ship.position.x, y: ship.position.y, z: 80)
cameraNode.camera?.motionBlurIntensity = 1.0
cameraNode.camera?.automaticallyAdjustsZRange = true
scnScene.rootNode.addChildNode(cameraNode)
}
You are enabling the manual camera control.
scnView.allowsCameraControl = true
If you want to use e.g. SCNLookAtConstraint you have to disable that. Otherwise you have a conflict. The camera is not supposed to point at a certain position while simultaneously being rotated by the user.
If you want to stay with the default camera controller you can create an additional SCNNode as the parent for your planet and the ships. This parent node can now be moved so that the pivot point is at your desired position.
I created a project where I have a ball and when the view loads, it falls down, which is good. I'm trying to get the ball to jump back up and fall down again when the Spritenode is tapped.
--This Question was edited--
Originally, I was able to get it to work when sprite.userInteractionEnabled = false. I had to turn this statement true in order to get the score to change.
Now I can't get the balls to fall and be tapped to jump. When I turn ball.physicsBody?.dynamic = true, the balls will fall due to gravity. How do I tap the sprite itself and make it jump.
GameScene.swift (For those who want to try the code for themselves.)
import SpriteKit
class GameScene: SKScene {
var ball: Ball!
private var score = 0 {
didSet { scoreLabel.text = "\(score)" }
}
override func didMoveToView(view: SKView) {
let ball = Ball()
scoreLabel = SKLabelNode(fontNamed:"Geared-Slab")
scoreLabel.fontColor = UIColor.blackColor()
scoreLabel.position = CGPoint( x: self.frame.midX, y: 3 * self.frame.size.height / 4 )
scoreLabel.fontSize = 100.0
scoreLabel.zPosition = 100
scoreLabel.text = String(score)
self.addChild(scoreLabel)
ball.position = CGPoint(x:self.size.width / 2.0, y: 440)
addChild(ball)
ball.physicsBody = SKPhysicsBody(circleOfRadius: 120)
ball.physicsBody?.dynamic = true
ball.physicsBody?.allowsRotation = false
ball.physicsBody?.restitution = 3
ball.physicsBody?.friction = 0
ball.physicsBody?.angularDamping = 0
ball.physicsBody?.linearDamping = 0
ball.physicsBody?.usesPreciseCollisionDetection = true
}
class Ball: SKSpriteNode {
init() {
let texture = SKTexture(imageNamed: "Ball")
super.init(texture: texture, color: .clearColor(), size: texture.size())
userInteractionEnabled = true
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
let scene = self.scene as! GameScene
scene.score += 1
}
Before, it was a SKNode being tapped using CGVectorMake(impulse, velocity) now, it's a SKSpriteNode, and I tried using SKAction, but it either does not work, or I'm putting it in the wrong place(touches begin).
I tested your code and it seems that using firstBall.userInteractionEnabled = true is the cause. Without it, it should work. I did some research (here for example), but can't figure out what's the reason of this behavior with userInteractionEnabled. Or for what reason do you use userInteractionEnabled?
Update due to update of question
First ball.physicsBody?.restitution = 3 defines the bounciness of the physics body. The default value is 0.2 and the property must be between 0.0 ans 1.0. So if you set it to 3.0 it will cause some unexpected effects. I just deleted it to use the default value of 0.2.
Second, to make the ball jump after tap and increase the score I put
physicsBody?.velocity = CGVectorMake(0, 600)
physicsBody?.applyImpulse(CGVectorMake(0, 1100))
in the touchesBegan method of the Ball class
Result
I have two separate nodes with their own physics bodies, and when they collide, an SKScene with the high score and replay button should present itself. This is how my scene is called:
func didBeginContact(contact: SKPhysicsContact) {
gameOver()
print("gameOver")
}
And this is how my physics bodies for my nodes are set up:
func createDown(position: CGPoint) -> SKNode {
let circleNode = SKSpriteNode()
let circle = SKSpriteNode(imageNamed: "first#2x")
circleNode.position = CGPointMake(position.x, position.y)
circleNode.physicsBody = SKPhysicsBody(circleOfRadius: 30)
circleNode.physicsBody?.dynamic = false
circle.size = CGSize(width: 75, height: 75)
circleNode.addChild(circle)
circleNode.name = "circleNode"
circle.name = "CIRCLE"
let up = SKAction.moveByX(0, y: -9000, duration: 100)
physicsBody?.categoryBitMask = blackCategory
circleNode.runAction(up)
return circleNode
}
func playerPhysics() {
player.physicsBody = SKPhysicsBody(circleOfRadius: 30)
player.physicsBody?.affectedByGravity = false
player.physicsBody?.categoryBitMask = playerCategory
player.physicsBody?.contactTestBitMask = blackCategory
}
And here is my gameOver function:
func gameOver() {
gameEnd = true
let reveal = SKTransition.fadeWithDuration(1)
let scene = GameOver(size: self.scene!.size)
view!.presentScene(scene, transition: reveal)
}
Am I missing something? Will post more code if necessary.
Just use intersectsNode and call gameOver() when the two nodes collide.
if yourNode.intersectsNode(yourSecondNode) {
gameOver()
}
SKNode Class Reference: SKNode
You need to add the physics world as a contact delegate for your methods to work.
class GameScene: SKScene, SKPhysicsContactDelegate {
override func didMoveToView(view: SKView) {
physicsWorld.contactDelegate = self
And like Whirlwind said, you need to set your categoryBitMask and contactTestBitMask for the circle node.
Then everything should work. I hope I could help.
I can't seem to figure this out. I've tried many different things and none of them seem to work. With my current code, the camera and the hero never line up and the scene seems to jump pretty far when I touch the screen. All I want to do is when I touch the screen have the hero move to the touch point and have the camera follow him. Is there some way to lock the camera to the hero spritenode?
import SpriteKit
let tileMap = JSTileMap(named: "level2.tmx")
let hero = SKSpriteNode(imageNamed: "hero")
let theCamera: SKCameraNode = SKCameraNode()
class GameScene: SKScene {
override func didMoveToView(view: SKView) {
/* Setup your scene here */
self.anchorPoint = CGPoint(x: 0, y: 0)
self.position = CGPoint(x: 0, y: 0)
hero.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame))
hero.xScale = 0.5
hero.yScale = 0.5
hero.zPosition = 2
tileMap.zPosition = 1
tileMap.position = CGPoint(x: 0, y: 0)
self.addChild(tileMap)
self.addChild(hero)
self.addChild(theCamera)
self.camera = theCamera
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
/* Called when a touch begins */
for touch in touches {
let location = touch.locationInNode(self)
let action = SKAction.moveTo(location, duration: 1)
hero.runAction(action)
}
}
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
self.camera?.position = hero.position
}
}
The reason why you saw the scene jumped pretty far is because the scene.size doesn't equal to the screen size. I guess you might initialize your first scene like this:
// GameViewController.swift
if let scene = GameScene(fileNamed:"GameScene") {...}
That code will load GameScene.sks whose size is 1024*768 by default. But since you add your SKSpriteNode programmatically, you can initialize the scene in this way to fit the screen size:
// GameViewController.swift
// Only remove if statement and modify
let scene = GameScene(size: view.bounds.size) ...
This will solve most of the problem you have. Moreover, I suggest moving the camera node using SKAction:
override func update(currentTime: CFTimeInterval) {
let action = SKAction.moveTo(hero.position, duration: 0.25)
theCamera.runAction(action)
}
The last thing, add this line to align the camera with your hero at the start:
self.camera?.position = hero.position