With my current code, the node is extremely laggy, and moves or teleports in random directions for some reason when its flicked. How can i fix this, and also can someone explain why it is teleporting and moving to random places in the scene.
Also, is there anyway to allow the node to be moved only when it is dragged from its position, rather than being at the gesturerecognizer's coordinates at all times?
override func didMove(to view: SKView) {
let gestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(self.pan(_:)))
view.addGestureRecognizer(gestureRecognizer)
circleNode.physicsBody = SKPhysicsBody(circleOfRadius: 20)
self.physicsWorld.gravity = CGVector(dx: 0, dy: 0)
self.addChild(circleNode)
}
@objc func pan(_ recognizer: UIPanGestureRecognizer) {
if recognizer.state == .changed {
self.physicsWorld.gravity = CGVector(dx: 0, dy: 0)
var location = recognizer.location(in: self.view!)
location = self.convertPoint(fromView: location)
circleNode.position = location
}
if recognizer.state == .ended {
self.physicsWorld.gravity = CGVector(dx: 0, dy: -9.8)
let transformerX = 1024/self.view!.frame.size.width
let transformerY = 768/self.view!.frame.size.height
let velocity = recognizer.velocity(in: self.view)
circleNode.physicsBody?.applyForce(CGVector(dx: velocity.x * transformerX, dy: velocity.y * transformerY))
}
}
Here is some code I was playing around with. I'm able to drag and flick a spear (spear Image) and also "pop" a pig head. This is the whole GameScene.Remove the code you don't need. :)
import SpriteKit
import CoreMotion
class GameScene: SKScene, SKPhysicsContactDelegate {
enum CollisionTypes: UInt32{
case spear = 1
case wall = 2
case head = 4
}
var touchPoint: CGPoint = CGPoint()
var touching: Bool = false
override func didMove(to view: SKView) {
self.physicsBody = SKPhysicsBody(edgeLoopFrom: self.frame)
//Add contact delegate
physicsWorld.contactDelegate = self
self.backgroundColor = .white
self.addChild(spearNode)
self.addChild(headNode)
}
lazy var spearNode: SKSpriteNode = {
let node = SKSpriteNode(imageNamed: "spear2")
node.name = "Spear"
node.physicsBody = SKPhysicsBody(texture: node.texture!,
size: CGSize(width: node.frame.width , height: node.frame.height))
node.position = CGPoint(x:self.frame.midX , y:self.frame.midY)
node.physicsBody?.affectedByGravity = true
node.physicsBody?.allowsRotation = false
node.size = CGSize(width: node.frame.width , height: node.frame.height )
node.physicsBody?.categoryBitMask = CollisionTypes.spear.rawValue
node.physicsBody?.contactTestBitMask = CollisionTypes.head.rawValue
node.physicsBody?.collisionBitMask = CollisionTypes.head.rawValue
return node
}()
lazy var headNode: SKSpriteNode = {
let node = SKSpriteNode(imageNamed: "Pig")
node.name = "Pig"
node.physicsBody = SKPhysicsBody(texture: node.texture!,
size: CGSize(width: node.frame.width , height: node.frame.height))
node.position = CGPoint(x:self.frame.midX , y:self.frame.maxY - 100)
node.physicsBody?.affectedByGravity = true
node.physicsBody?.allowsRotation = false
node.size = CGSize(width: node.frame.width / 2 , height: node.frame.height / 2 )
node.physicsBody?.categoryBitMask = CollisionTypes.head.rawValue
return node
}()
func didBegin(_ contact: SKPhysicsContact){
guard let nodeA = contact.bodyA.node else {return}
guard let nodeB = contact.bodyB.node else {return}
print("Contacted")
if nodeA.name == "Pig" && nodeB.name == "Spear"{
nodeA.removeFromParent()
}
if nodeA.name == "Spear" && nodeB.name == "Pig"{
nodeB.removeFromParent()
}
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch = touches.first!
let location = touch.location(in:self)
if spearNode.frame.contains(location) {
touchPoint = location
touching = true
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch = touches.first!
let location = touch.location(in: self)
touchPoint = location
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
touching = false
}
override func update(_ currentTime: TimeInterval) {
physicsWorld.gravity = CGVector(dx:0, dy: -9.8)
if touching {
let dt:CGFloat = 1.0/60.0
let distance = CGVector(dx: touchPoint.x-spearNode.position.x, dy: touchPoint.y-spearNode.position.y)
let velocity = CGVector(dx: distance.dx/dt, dy: distance.dy/dt)
spearNode.physicsBody!.velocity=velocity
}
}
}