//
// ContentView.swift
// Racing
//
// Created by user208560 on 3/2/22.
//
import SwiftUI
import SpriteKit
import GameplayKit
class GameScene: SKScene, SKPhysicsContactDelegate {
let player = SKSpriteNode(imageNamed: "player-motorbike.png")
var gameTimer: Timer?
var touchingPlayer = false
let spriteScale = 0.75
let newObstacleRepeatTime = 0.2
override func didMove(to view: SKView) {
// initialise method
let background = SKSpriteNode(imageNamed: "road.jpg")
background.zPosition = -1
background.position = CGPoint(x: self.frame.size.width/2, y: self.frame.size.height/2)
background.size = CGSize(width: self.frame.size.width, height: self.frame.size.height)
addChild(background)
gameTimer = Timer.scheduledTimer(timeInterval: newObstacleRepeatTime, target: self, selector: #selector(createObstacle), userInfo: nil, repeats: true)
/* if let particles = SKEmitterNode(fileNamed: "Mud") {
particles.advanceSimulationTime(10)
particles.position.x = self.frame.size.width
particles.position.y = self.frame.size.height/2
particles.particlePositionRange.dy = self.frame.size.height
addChild(particles)
}*/
// position the player
player.position.x = 40
player.position.y = self.frame.size.height/2
// lift it above the background layer
player.zPosition = 1
player.setScale(spriteScale)
// attach the player sprite to the scene - adds it to the scene and displays it
addChild(player)
player.physicsBody = SKPhysicsBody(texture: player.texture!, size: player.size)
// give the physics body a bit mask that can be used to identify the player sprite
player.physicsBody?.categoryBitMask = 1
player.physicsBody?.affectedByGravity = false
// turn on the collision detection and tell the scene to handle collisions
physicsWorld.contactDelegate = self
}
override func update(_ currentTime: TimeInterval) {
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
// first we check to see if any new touches have been detected
// if none have been detected we exit the method
guard let touch = touches.first else { return }
// next we get the location of the touch
let location = touch.location(in: self)
// next we get a list of all nodes (objects attached directly to the scene) at that location
let tappedNodes = nodes(at: location)
// now we check if the player sprite is one of the nodes at the location
if tappedNodes.contains(player) {
// if the player sprite is at the location then set touchingPlyer to true
touchingPlayer = true
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
// first we check if the player sprite is currently being touched, if it isn't we just exit the method
guard touchingPlayer else { return }
// next we check to see if any moving touches have been detected
// if none have been detected we exit the method
guard let touch = touches.first else { return }
// now we know the player sprite and the screen are being touched at the same time
// we get the position of the touch
let location = touch.location(in: self)
// then we move the player sprite to that location
player.position.y = location.y
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
// we also need to release the player sprite when the touch ends
touchingPlayer = false
}
@objc func createObstacle(){
// create a random number generator that generators integers within a range
let randomDistribution = GKRandomDistribution(lowestValue: 50, highestValue: Int((self.frame.self.height - 50)))
let sprite = SKSpriteNode(imageNamed: "car")
let carX = Int((self.frame.size.width + 100))
sprite.position = CGPoint(x: carX, y: randomDistribution.nextInt())
// give the sprite a name so we can identify it (used for collision detection)
sprite.name = "enemy"
// set the zPosition so it is above the background layer
sprite.zPosition = 1
sprite.setScale(spriteScale)
addChild(sprite)
// Give the sprite a physics body.
// We use this to give it a velocity so that it will automatically move to the left
// (and we'll use it later to detect collisions)
sprite.physicsBody = SKPhysicsBody(texture: sprite.texture!, size: sprite.size)
sprite.physicsBody?.velocity = CGVector(dx: -500, dy: 0)
sprite.physicsBody?.affectedByGravity = false
sprite.physicsBody?.linearDamping = 0
sprite.physicsBody?.contactTestBitMask = 1
// give each sprite a bit mask of 0
sprite.physicsBody?.categoryBitMask = 0
}
func didBegin(_ contact: SKPhysicsContact) {
// There should be two nodes in any collision, we check to make sure we have two nodes and exit the method if we don't
guard let nodeA = contact.bodyA.node else { return }
guard let nodeB = contact.bodyB.node else { return }
// we want the player sprite to react to hitting the other object, so we need to identify which node is the player and pass the other node to a method which will update the player
if nodeA == player {
playerHit(nodeB)
} else {
playerHit(nodeA)
}
}
func playerHit(_ node: SKNode) {
// right now we'll simply remove the player sprite, we'll need to passed in node to do something more interesting later
player.removeFromParent()
node.removeFromParent()
}
}
struct ContentView: View {
var scene: SKScene {
let scene = GameScene(size: UIScreen.main.bounds.size)
scene.scaleMode = .fill
return scene
}
var body: some View {
SpriteView(scene: scene)
.frame(width: scene.size.width, height: scene.size.height)
}
}