I am changing the alpha value of spriteNode like this,
if (firstBody.node?.name)! == "Player" && secondBody.node?.name == "Alpha 1" {
var item: SKSpriteNode?
item = SKSpriteNode(imageNamed: "BG")
item!.alpha = 0.1
score += 1
scoreLabel?.text = String(score)
}
This is what it says in the documentation (use node.alpha = value), but I am not sure why it isn't working.
you can fade the alpha by using a Action, I have left an example below.
class GameScene: SKScene {
var player: SKSpriteNode!
override func didMove(to view: SKView) {
player = SKSpriteNode(color: .purple, size: CGSize(width: 100, height: 100))
player.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
self.addChild(player)
}
func fadePlayer() {
let fadeAlpha = SKAction.fadeAlpha(to: 0.1, duration: 1.0)
self.run(fadeAlpha)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
fadePlayer()
}
}
When a touch begins the SpriteNode will fade out to the alpha value you insert, it will fade out gradually during a time you insert in the duration also, This action fades the SpriteNode's alpha to 0.1 gradually over 1 second.
Related
Im attempting to use some of the code from a solution found on this page for creating a button Create Button in SpriteKit: Swift
class GameScene: SKScene {
let button = SKSpriteNode(imageNamed: "yourImgName")
override func didMoveToView(view: SKView) {
button.name = "btn"
button.size.height = 100
button.size.width = 100
button.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame) + 50)
self.addChild(button)
//Adjust button properties (above) as needed
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
let touch = touches.first
let positionInScene = touch!.locationInNode(self)
let touchedNode = self.nodeAtPoint(positionInScene)
if let name = touchedNode.name {
if name == "btn" {
let yourNextScene = YourNextScene(fileNamed: "YourNextScene")
self.view?.presentScene(yourNextScene!)
}
}
}
}
and the current code that I have is supposed to make the player jump when the button is pressed, but nothing is currently happening when its pressed
import SwiftUI
import SpriteKit
import UIKit
class GameScene: SKScene {
override func didMove(to view: SKView) {
let button = SKSpriteNode(imageNamed: "playerOBJ")
let player = SKSpriteNode(imageNamed: "playerOBJ")
let playerRadius = player.frame.width / 2.0
player.position = CGPoint(x: 200, y: 500)
player.name = "Jimmy"
addChild(player)
player.physicsBody = SKPhysicsBody(circleOfRadius: playerRadius)
player.physicsBody?.allowsRotation = false
player.physicsBody?.friction = 0
player.physicsBody?.restitution = 0
player.zPosition = 100
// Button
button.name = "btn"
button.size.height = 100
button.size.width = 100
button.position = CGPoint(x: 100, y: 100)
self.addChild(button)
// Physics
physicsBody = SKPhysicsBody(edgeLoopFrom: frame.inset(by: UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)))
Timer.scheduledTimer(withTimeInterval: 2, repeats: true) { _ in
player.physicsBody?.applyForce(CGVector(dx: 100, dy: 1000))
}
func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
let touch = touches.first
let positionInScene = touch!.location(in: self)
let touchedNode = self.atPoint(positionInScene)
if let name = touchedNode.name {
if name == "btn" {
player.physicsBody?.applyForce(CGVector(dx: 0, dy: 10000))
}
}
}
}
override func update(_ currentTime: TimeInterval) { }
}
I'm thinking that maybe this is an issue with the press not being resitered at all but I'm not fully sure
Your main problem is you put all of your code inside the didMove function. You put the touchesBegan function inside the didMove function. When the didMove function finishes, touchesBegan goes away so none of your touches are going to be handled in the game.
You also declared the button and the player as local variables inside the didMove function.
override func didMove(to view: SKView) {
let button = SKSpriteNode(imageNamed: "playerOBJ")
let player = SKSpriteNode(imageNamed: "playerOBJ")
// Rest of function omitted
}
When the didMove function finishes, the button and player go away too. You also have the same image name for the player and button.
The fix is to make the button and player variables properties of the GameScene class. Move touchesBegan out of the didMove function too.
class GameScene: SKScene {
// Declare button and player here.
var button = SKSpriteNode()
var player = SKSpriteNode()
override func didMove(to view: SKView) {
// Initialize button, player, and everything else here.
}
func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
// Code in touchesBegan func goes here.
}
}
I'm working in SpriteKit and I need to create a 'playable area', an area that is same size as the device screen so that I can stop my player from moving off-screen.
I'm using the following line of code:
var playableRect: CGRect = UIScreen.main.bounds
But the resulting rectangle is about a quarter of the device screen, with a corner of that rectangle at what looks to be the center of the screen. And the device orientation doesn't change that.
I've tried everything I can think of. Nothing is working.
How do I create a rectangle that's the same size as the device screen?
Here's my full coding, after changing to include Gene's suggestion. I incorporated Gene's suggestion by revising playableRect inside the didMove method. But the result is unchanged with that coding.
import SpriteKit
import GameplayKit
import CoreMotion
#objcMembers
class GameSceneUsingTilt: SKScene {
let player = SKSpriteNode(imageNamed: "player-motorbike")
let motionManager = CMMotionManager()
var playableRect = UIScreen.main.bounds
override func didMove(to view: SKView) {
let background = SKSpriteNode(imageNamed: "road")
background.zPosition = -1
addChild(background)
if let particles = SKEmitterNode(fileNamed: "Mud") {
let farRightPt = frame.maxX // start the emitter at the far right x-point of the view
particles.advanceSimulationTime(10)
particles.position.x = farRightPt
addChild(particles)
}
let nearLeftPt = frame.minX * 3 / 4 // start the player at a quarter of the way to the far left x-point of the view
player.position.x = nearLeftPt
player.zPosition = 1
addChild(player)
motionManager.startAccelerometerUpdates()
// coding below shows outline of playableRect
let bounds = UIScreen.main.bounds
let scale = UIScreen.main.scale
// let size = CGSize(width: bounds.size.width * scale, height: bounds.size.height * scale)
playableRect = CGRect(x: 0, y: 0, width: bounds.size.width * scale, height: bounds.size.height * scale)
drawPlayableRect(rect: playableRect)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
}
func boundsCheck() {
let playableRect = CGRect(x: frame.minX, y: frame.minY, width: frame.width, height: frame.height)
let bottomLeft = CGPoint(x: playableRect.minX, y: playableRect.minY)
let topRight = CGPoint(x: playableRect.maxX, y: playableRect.maxY)
if player.position.x <= bottomLeft.x {
player.position.x = bottomLeft.x
}
if player.position.x >= topRight.x {
player.position.x = topRight.x
}
if player.position.y <= bottomLeft.y {
player.position.y = bottomLeft.y
}
if player.position.y >= topRight.y {
player.position.y = topRight.y
}
}
override func update(_ currentTime: TimeInterval) {
if let accelerometerData = motionManager.accelerometerData {
// note that since the game will be running in landscape mode, up and down movement is controlled by the x axis and right to left movement is controlled by the y-axis...so this is the inverse of what you'd normally think.
let changeX = CGFloat(accelerometerData.acceleration.y) * 4
let changeY = CGFloat(accelerometerData.acceleration.x) * 4
// you have to subtract from x position and add to the y position because device is rotated so the axises aren't what you would normally expect.
player.position.x -= changeX
player.position.y += changeY
// check to make sure position isn't outside payable area:
boundsCheck()
}
}
// function below shows outline of playableRect
func drawPlayableRect(rect: CGRect) {
let shape = SKShapeNode()
let path = CGMutablePath()
path.addRect(rect)
shape.path = path
shape.strokeColor = .red
shape.lineWidth = 4.0
addChild(shape)
}
}
Use: UIScreen.main.nativeBounds
I am building a spritekit game and have just started the project. I have a circle on the screen which starts in the center, and when i drag my finger from the circle outward, it will show a dotted line/bezierpath connected to the ball which will help the user see where it is aiming the ball. When the user lifts their finger, the ball will shoot in the opposite direction of the aim line. (Think a game like soccer stars or pool). The issue is that the maneuver works the first time when everything starts in the middle: I drag my finger and the ball shoots in opposite direction then stops. But when I try it again, the position of the aiming line says it is the same as the ball (It should be), but then it shows up like an inch away from the ball on the screen. I feel like this may be an issue that the scene(s) behind the objects may not be the same size? But I'm confused because I think I'm only using one scene.
GameViewController viewDidLoad:
override func viewDidLoad() {
super.viewDidLoad()
if let view = self.view as! SKView? {
// Load the SKScene from 'GameScene.sks'
if let scene = SKScene(fileNamed: "GameScene") {
// Set the scale mode to scale to fit the window
scene.scaleMode = .aspectFill
scene.size = view.bounds.size
//scene.anchorPoint = CGPoint(x: 0.0, y: 0.0)
// Present the scene
view.presentScene(scene)
}
view.ignoresSiblingOrder = true
view.showsFPS = true
view.showsNodeCount = true
}
}
GameScene Code (Doubt you need all of it but whatever):
import SpriteKit
import GameplayKit
class GameScene: SKScene {
var ball = SKShapeNode(circleOfRadius: 35)
var touchingBall = false
var aimLine = SKShapeNode()
var startAimPoint = CGPoint()
var endAimPoint = CGPoint()
let damping:CGFloat = 0.94
override func didMove(to view: SKView) {
ball.fillColor = SKColor.orange
ball.name = "ball"
let borderBody = SKPhysicsBody(edgeLoopFrom: self.frame)
borderBody.friction = 0
self.physicsBody = borderBody
physicsWorld.gravity = CGVector(dx: 0.0, dy: 0.0)
var physicsBody = SKPhysicsBody(circleOfRadius: 35)
ball.physicsBody = physicsBody
ball.physicsBody?.affectedByGravity = false
ball.physicsBody?.friction = 10.0
ball.position = CGPoint(x: frame.midX, y: frame.midY)
self.addChild(ball)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
print("TOUCHES BEGAN.")
for touch in touches {
print("TB: \(touchingBall)")
let location = touch.location(in: self)
let node : SKNode = self.atPoint(location)
if node.name == "ball" {
// touched inside node
if ball.physicsBody!.angularVelocity <= 0.0{
touchingBall = true
startAimPoint = ball.position
print(touchingBall)
}
}
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
print("TOCUHES MOVED.")
for touch in touches {
let location = touch.location(in: self)
if touchingBall{
endAimPoint = location
assignAimLine(start: startAimPoint, end: endAimPoint)
print("Moving touched ball")
}
}
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
print("Touches ended. \(touchingBall)")
if touchingBall == true{
ball.physicsBody!.applyImpulse(CGVector(dx: -(endAimPoint.x - startAimPoint.x) * 3, dy: -(endAimPoint.y - startAimPoint.y) * 3))
}
touchingBall = false
aimLine.removeFromParent()
print(touchingBall)
}
override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
print("Touches cancelled. \(touchingBall)")
if touchingBall == true{
ball.physicsBody!.applyImpulse(CGVector(dx: -(endAimPoint.x - startAimPoint.x) * 3, dy: -(endAimPoint.y - startAimPoint.y) * 3))
}
touchingBall = false
aimLine.removeFromParent()
print(touchingBall)
}
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
print(ball.physicsBody!.velocity)
let dx2 = ball.physicsBody!.velocity.dx * damping
let dy2 = ball.physicsBody!.velocity.dy * damping
ball.physicsBody!.velocity = CGVector(dx: dx2, dy: dy2)
}
func assignAimLine(start: CGPoint, end: CGPoint){
aimLine.removeFromParent()
var bezierPath = UIBezierPath()
bezierPath.move(to: start)
bezierPath.addLine(to: shortenedEnd(startPoint: start, endPoint: end))
var pattern : [CGFloat] = [10.0, 10.0]
let dashed = SKShapeNode(path: bezierPath.cgPath.copy(dashingWithPhase: 2, lengths: pattern))
aimLine = dashed
aimLine.position = ball.position
aimLine.zPosition = 0
self.addChild(aimLine)
}
func hypotenuse(bp: UIBezierPath) -> Double{
var a2 = bp.cgPath.boundingBox.height * bp.cgPath.boundingBox.height
var b2 = bp.cgPath.boundingBox.width * bp.cgPath.boundingBox.width
return Double(sqrt(a2 + b2))
}
func hypotenuse(startP: CGPoint, endP: CGPoint) -> Double{
var bezierPath = UIBezierPath()
bezierPath.move(to: startP)
bezierPath.addLine(to: endP)
return hypotenuse(bp: bezierPath)
}
func shortenedEnd(startPoint: CGPoint, endPoint: CGPoint) -> CGPoint{
var endTemp = endPoint
//while hypotenuse(startP: startPoint, endP: endTemp) > 150{
endTemp = CGPoint(x: endTemp.x / 1.01, y: endTemp.y / 1.01)
//}
return endTemp
}
func addTestPoint(loc: CGPoint, color: UIColor){
var temp = SKShapeNode(circleOfRadius: 45)
temp.fillColor = color
temp.position = loc
self.addChild(temp)
}
}
I tried printing the frame size for the scene and it says 400 something x 700 something (I am testing on iPhone 6 Plus), and it says the UIScreen is same size so i don't know what issue is. Overall, I just need the aiming line to be on the center of the circle more than just the first time I try the maneuver. Thanks.
Like I mentioned in the comments, your problem was how you were laying out your paths. The code below makes the path relative to the ball instead of absolute to the scene. I also fixed the issue with creating new shapes every time.
import SpriteKit
import GameplayKit
class GameScene: SKScene {
var ball = SKShapeNode(circleOfRadius: 35)
var touchingBall = false
var aimLine = SKShapeNode()
var endAimPoint = CGPoint()
override func didMove(to view: SKView) {
ball.fillColor = SKColor.orange
ball.name = "ball"
let borderBody = SKPhysicsBody(edgeLoopFrom: self.frame)
borderBody.friction = 0
self.physicsBody = borderBody
physicsWorld.gravity = CGVector(dx: 0.0, dy: 0.0)
ball.position = CGPoint(x: frame.midX, y: frame.midY)
let physicsBody = SKPhysicsBody(circleOfRadius: 35)
physicsBody.affectedByGravity = false
physicsBody.friction = 10.0
physicsBody.linearDamping = 0.94
ball.physicsBody = physicsBody
self.addChild(ball)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
print("TOUCHES BEGAN.")
for touch in touches {
print("TB: \(touchingBall)")
let location = touch.location(in: self)
let node : SKNode = self.atPoint(location)
if node.name == "ball" {
// touched inside node
if ball.physicsBody!.angularVelocity <= 0.0{
touchingBall = true
aimLine.path = nil
self.addChild(aimLine)
print(touchingBall)
}
}
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
print("TOCUHES MOVED.")
for touch in touches {
let location = touch.location(in: self)
if touchingBall{
endAimPoint = self.convert(location, to: ball)
assignAimLine(end: endAimPoint)
print("Moving touched ball")
}
}
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
print("Touches ended. \(touchingBall)")
if touchingBall == true{
ball.physicsBody!.applyImpulse(CGVector(dx: -(endAimPoint.x) * 3, dy: -(endAimPoint.y) * 3))
}
touchingBall = false
aimLine.removeFromParent()
print(touchingBall)
}
override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
print("Touches cancelled. \(touchingBall)")
if touchingBall == true{
ball.physicsBody!.applyImpulse(CGVector(dx: -(endAimPoint.x) * 3, dy: -(endAimPoint.y) * 3))
}
touchingBall = false
aimLine.removeFromParent()
print(touchingBall)
}
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
print(ball.physicsBody!.velocity)
//let dx2 = ball.physicsBody!.velocity.dx * damping
//let dy2 = ball.physicsBody!.velocity.dy * damping
//ball.physicsBody!.velocity = CGVector(dx: dx2, dy: dy2)
}
func assignAimLine(end: CGPoint){
let bezierPath = UIBezierPath()
bezierPath.move(to: CGPoint.zero)
bezierPath.addLine(to: end)
let pattern : [CGFloat] = [10.0, 10.0]
aimLine.position = ball.position
aimLine.path = bezierPath.cgPath.copy(dashingWithPhase: 2, lengths: pattern)
aimLine.zPosition = 0
}
func addTestPoint(loc: CGPoint, color: UIColor){
var temp = SKShapeNode(circleOfRadius: 45)
temp.fillColor = color
temp.position = loc
self.addChild(temp)
}
}
I am currently creating a 2D game in which I have a cannon staying at the bottom of the screen that fires projectiles to some targets in the upper part of the screen. The user can rotate the cannon in order to aim for the targets. I want the projectile to be fired to the location that the canon faces. I have no idea how to do that and I need your help... Heres my code ->
import SpriteKit
class GameScene: SKScene {
var canon = SKSpriteNode()
var projectile = SKSpriteNode()
var touching = false
var locked = false
var location = CGPoint()
override func didMoveToView(view: SKView) {
/* Setup your scene here */
projectile.position = canon.position
projectile.color = UIColor.whiteColor()
projectile.size = CGSize(width: 50, height: 50)
projectile.physicsBody?.affectedByGravity = false
projectile.physicsBody?.linearDamping = 1
projectile.physicsBody?.dynamic = true
addChild(projectile)
canon.zPosition = 2
canon = SKSpriteNode(color: UIColor.redColor(), size: CGSize(width: 50, height: 200))
canon.position = CGPoint(x: self.size.width/2.0, y: 10)
addChild(canon)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
/* Called when a touch begins */
touching = true
let touch = touches.first as UITouch!
location = touch.locationInView(self.view)
}
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
rotateCanon(location.x)
projectile.zRotation = canon.zRotation
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
touching = false
}
func rotateCanon(locationx:CGFloat) {
if locationx <= frame.width/5 && touching {
print(1)
canon.runAction(SKAction.rotateByAngle(0.01, duration: 0.1))
}
if locationx > frame.width/5 && touching {
print(2)
canon.runAction(SKAction.rotateByAngle(-0.01, duration: 0.1))
}
}
}`
Thanks a lot if you can help that would be awesome :D
When scaling a spriteNode to a smaller size (or larger size), the spriteNode by default scales from the centre, which is usually fine. However, I need my sprite to scale from the very left of it's body. Is there any way of changing the spriteNode's centre point so that I can achieved this?
I tried adjusting the anchor point of the spriteNode (below), which does scale from the left of the body, but it also repositions the spriteNode, which I do not want.
import SpriteKit
var mySprite: SKSpriteNode!
class GameScene: SKScene {
override func didMoveToView(view: SKView) {
anchorPoint = CGPointMake(0.5, 0.5)
backgroundColor = UIColor.greenColor()
mySprite = SKSpriteNode(color: UIColor.redColor(), size: CGSizeMake(100, 50))
mySprite.anchorPoint = CGPointMake(0.0, 0.5)
addChild(mySprite)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
mySprite.runAction(SKAction.scaleTo(0.5, duration: 1))
}
I was hoping for something like the below (which doesn't exist):
mySprite.centerPoint.x = -mySprite.size.width/2
Also, the below gets the result I want, but I don't really want to have to adjust the spriteNode position everytime I adjust the anchorPoint:
var mySprite: SKSpriteNode!
class GameScene: SKScene {
override func didMoveToView(view: SKView) {
anchorPoint = CGPointMake(0.5, 0.5)
backgroundColor = UIColor.greenColor()
mySprite = SKSpriteNode(color: UIColor.redColor(), size: CGSizeMake(100, 50))
mySprite.anchorPoint = CGPointMake(0.0, 0.5)
mySprite.position.x = -mySprite.size.width/2
addChild(mySprite)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
mySprite.runAction(SKAction.scaleTo(0.5, duration: 1))
}
Try to delete mySprite.anchorPoint = CGPointMake(0.0, 0.5) in didload and in touchesBegan:
mySprite.anchorPoint = CGPointMake(0.0, 0.5)
func repositionAncorPoint() {
mySprite.anchorPoint = CGPointMake(0.5, 0.5)
}
let resetAncor = SKAction.runBlock({ repositionAncorPoint() })
let rescale = SKAction.scaleTo(0.5, duration: 1)
let sequence = [rescale,resetAncor]
mySprite.runAction(SKAction.sequence(sequence))
I've not test it... :)