Hi,
I have a SKSpriteNode player and a SKSpriteNode sign. I want to drag the player to position above the sign but I can’t because I have given them both physics bodies. I have given them physics bodies because there is a score += 1 when they touch.
How do I adjust the physics codes so that I can drag and position the player to sit above the sign?
Thank you in advance.
Here are my codes:
import SpriteKit
import GameplayKit
struct PhysicsCategory {
static let none : UInt32 = 0
static let player : UInt32 = 0b1
static let sign : UInt32 = 0b10
}
class GameScene: SKScene {
let touchLocation = CGPoint()
let player = SKSpriteNode(imageNamed: "star")
let sign = SKSpriteNode(imageNamed: “Sign")
var playerContactsSign = 0
let scoreLabel = SKLabelNode(fontNamed: "Rockwell-Bold")
override func didMove(to view: SKView) {
scoreLabel.text = "Correct Answers: X"
scoreLabel.fontColor = SKColor.black
scoreLabel.fontSize = 50
scoreLabel.zPosition = 10
scoreLabel.alpha = 0.7
scoreLabel.horizontalAlignmentMode = .right
scoreLabel.verticalAlignmentMode = .top
scoreLabel.position = CGPoint(x: size.width/2 - 300, y: size.height/2 + 650)
self.addChild(scoreLabel)
spawnPlayer()
spawnSign()
physicsWorld.gravity = .zero
physicsWorld.contactDelegate = self
}
func spawnPlayer() {
player.name = "Che"
player.anchorPoint = CGPoint(x: 0.5, y: 0.5) //default
player.position = CGPoint(x: size.width/2 - 500, y: size.height/2 + 300)
player.zPosition = 10
player.physicsBody = SKPhysicsBody(circleOfRadius: player.size.width/2)
player.physicsBody?.isDynamic = true
player.physicsBody?.categoryBitMask = PhysicsCategory.player
player.physicsBody?.contactTestBitMask = PhysicsCategory.sign
player.physicsBody?.affectedByGravity = false
self.addChild(player)
player.setScale(0.5)
}
func spawnSign() {
sign.anchorPoint = CGPoint(x: 0.5, y: 0.5) //default
sign.position = CGPoint(x: size.width/2 - 500, y: size.height/2 - 300)
sign.zPosition = 3
sign.physicsBody = SKPhysicsBody(circleOfRadius: sign.size.width/2)
sign.physicsBody?.isDynamic = false
sign.physicsBody?.categoryBitMask = PhysicsCategory.sign
sign.physicsBody?.contactTestBitMask = PhysicsCategory.player
sign.physicsBody?.affectedByGravity = false
self.addChild(sign)
sign.setScale(3.5)
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
let touchLocation = touch.location(in: self)
let nodeTouched = atPoint(touchLocation)
if nodeTouched.name == "Che" {
player.position.x = touchLocation.x
player.position.y = touchLocation.y
}
}
}
override func update(_ currentTime: CFTimeInterval) {
//Printing time since last call to update
if lastUpdateTime > 0 {
dt = currentTime - lastUpdateTime
} else {
dt = 0
}
lastUpdateTime = currentTime
print("\(dt*1000) milliseconds since last update")
scoreLabel.text = "Correct Answers: \(playerContactsSign)"
}
func playerTouchesSign(player: SKSpriteNode, sign: SKSpriteNode) {
print("Touch")
playerContactsSign += 1
}
}
extension GameScene: SKPhysicsContactDelegate {
func didBegin(_ contact: SKPhysicsContact) {
// 1
var firstBody: SKPhysicsBody
var secondBody: SKPhysicsBody
if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
firstBody = contact.bodyA
secondBody = contact.bodyB
} else {
firstBody = contact.bodyB
secondBody = contact.bodyA
}
// 2
if ((firstBody.categoryBitMask & PhysicsCategory.player != 0) &&
(secondBody.categoryBitMask & PhysicsCategory.sign != 0)) {
if let player = firstBody.node as? SKSpriteNode,
let sign = secondBody.node as? SKSpriteNode {
playerTouchesSign(player: player, sign: sign)
}
}
}
}
