I am rather new to Swift and SpriteKit. I made a plane move around on a big background. What I am trying to do now is DRAG the "camera" so i can see the plane when its outside my view.
I made a SKCameraNode()
I can change its position without problem. And then I tried this for drag:
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first {
let location = touch.location(in: self)
camera?.position = CGPoint(x: location.x, y: location.y)
}
}
The camera moves when i drag, but super fast and far far far away...
Some ideas? Thanks!
Related
I want to create a game in which the player draws a line with physics, similar to the game Happy Glass.
What I have tried:
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches{
let location = touch.location(in: self)
touchPosition = location
}
}
func draw(pos: CGPoint){
let node = SKSpriteNode(imageNamed: "circle")
node.position = CGPoint(x: pos.x, y: pos.y)
node.size = CGSize(width: 10, height: 10)
node.physicsBody = SKPhysicsBody(circleOfRadius: node.frame.width / 2)
//set up the physics
self.addChild(node)
}
override func didSimulatePhysics() {
if touching{
draw(pos: touchPosition)
}
}
So I basically change the touchPosition variable every time a touch is moved(when the user drags their finger across the screen) then I have didSimulatePhysics as repeating timer to add small circles at the touchPosition with physics on them.
The Problem:
This all works. The only problem is that they are too spread out. I want it to be a continuous line but the touchesMoved method is not recognizing enough touches so it looks like this.
Is there a way to recognize touches more frequently so I can fill an entire line or some way to possibly do this with a CGPath? I just can't have these gaps in between these points basically because I can't have other nodes with physicBodies falling between the cracks.
The other thing is that the points are constantly moving off the screen with a SKAction, so I can just draw a CGPath line from the current touch to the last touch because the point from the last touch will have moved slightly so i'm kind of confused in what to do and any suggestions would be helpful.
Thanks
At the moment I have a game in which the sprite can be controlled and moved along the x axis (with a fixed y position) using the accelerometer of the device. I wish to change this so the user can control the sprite by dragging on the screen like in popular games such as snake vs.block.
I've already tried using the touches moved method which gives the correct effect, although the sprite first moves to the location of the users touch which I don't want.
Below is the environment I've been using to experiment, the touches moved gives the correct type of control I want although I can't seem to figure out how to stop the sprite first moving to the location of the touch before the swipe/drag
import SpriteKit
import GameplayKit
var player = SKSpriteNode()
var playerColor = UIColor.orange
var background = UIColor.black
var playerSize = CGSize(width: 50, height: 50)
var touchLocation = CGPoint()
var shape = CGPoint()
class GameScene: SKScene {
override func didMove(to view: SKView) {
self.backgroundColor = background
spawnPlayer()
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches{
let touchLocation = touch.location(in: self)
player.position.x = touchLocation.x
}
}
func spawnPlayer(){
player = SKSpriteNode(color: playerColor, size: playerSize)
player.position = CGPoint(x:50, y: 500)
self.addChild(player)
}
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
}
In summary, I'm looking for the same method of controlling a sprite as in snakes vs blocks
Hey so you have the right idea, you need to store a previous touchesMovedPoint. Then use it to determine how far your finger has moved each time touchesMoved has been called. Then add to the player's current position by that quantity.
var lastTouchLoc:CGPoint = CGPoint()
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches{
let touchLocation = touch.location(in: self)
let dx = touchLocation.x - lastTouchLoc.x
player.position.x += dx // Change the players current position by the distance between the previous touchesMovedPoint and the current one.
lastTouchLoc.x = touchLocation.x // Update last touch location
}
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
// When releasing the screen from point "E" we don't want dx being calculated from point "E".
// We want dx to calculate from the most recent touchDown point
let initialTouchPoint = touch.location(in: self)
lastTouchLoc.x = initialTouchPoint.x
}
}
You want to use SKAction.move to perform what you want.
func distance(from lhs: CGPoint, to rhs: CGPoint) -> CGFloat {
return hypot(lhs.x.distance(to: rhs.x), lhs.y.distance(to: rhs.y))
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches{
let touchLocation = touch.location(in: self)
let speed = 100/1 //This means 100 points per second
let duration = distance(player.position,touchLocation) / speed //Currently travels 100 points per second, adjust if needed
player.run(SKAction.move(to:touchLocation, duration:duration),forKey:"move")
}
}
What this does is it will move your "snake" to the new location at a certain duration. To determine duration, you need to figure out how fast you want your "snake" to travel. I currently have it set up to where it should take 1 second to move 100 points, but you may want to adjust that as needed.
I'm trying to implement swipe gestures left and right into a game in SpriteKit where the player collects falling objects spawning from the top of the screen. The problem I'm facing is trying to keep a continuous movement of the player while the finger is on the screen until the touch is ended and the player stays where the last touch ended. There might be a better way to implement this other than swipe gestures hence why I'm asking you guys! Any help would be great, thank you all!
This is not something you want to use a swipe (I think you are using pan) gesture for. What you want to do is override the touchesBegan, touchesMoved, and touchesEnded calls on the scene, and plan your movement according to these 3 methods.
You are probably going to want to use SKAction.move(to:duration:) with these methods, and figure out the math to keep a constant speed.
E.G.
func movePlayer(to position:CGPoint)
{
let distance = player.position.distance(to:position)
let move = SKAction.move(to:position, duration: distance / 100) // I want my player to move 100 points per second
//using a key will cancel the last move action
player.runAction(move,withKey:"playerMoving")
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
{
let touch = touches.first
let position = touch.location(in node:self)
movePlayer(to:position)
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?)
{
let touch = touches.first
let position = touch.location(in node:self)
movePlayer(to:position)
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
let touch = touches.first
let position = touch.location(in node:self)
movePlayer(to:position)
}
*I searched most places and could not find a "basic solution" to my question
Hi there, I am trying to create a simple SKSpriteNode that will move along with my finger anywhere on the screen (x & y coords). So far what I have done is the code below, and I can't seem to figure out much else because my Sprite won't even move when the game is ran. I am also getting an error at:
simpleS = self.childNode(withName: "simpleS") as! SKSpriteNode
This line of code causes my program to not run since I've added it. Please and thanks for your help.
In this case Sprite "simpleS" is the Sprite I am trying to move when touches begin.
CODE STARTS HERE:
import SpriteKit
import GameplayKit
class GameScene: SKScene {
var simpleS = SKSpriteNode()
override func didMove(to view: SKView) {
simpleS = self.childNode(withName: "simpleS") as! SKSpriteNode
simpleS.physicsBody?.affectedByGravity = true
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
let location = touch.location(in: self)
simpleS.run(SKAction.moveTo(x: location.x, duration: 0.0))
simpleS.run(SKAction.moveTo(y: location.y, duration: 0.0))
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
let location = touch.location(in: self)
simpleS.run(SKAction.moveTo(x: location.x, duration: 0.0))
simpleS.run(SKAction.moveTo(y: location.y, duration: 0.0))
}
}
}
this code
simpleS = self.childNode(withName: "simpleS") as! SKSpriteNode
connects the sprites in your GameScene.sks with GameScene.swift
so in the first step you have to make sure that you set the right name (exactly "simpleS") in your sks file.
if you did it right, so please send the error for us.
i have built and ran your code and everything works in a right way.
another point is that if you want your sprites only moves by your finger movement you have to delete the codes in touchesBegan function, because touchesBegan moves your sprite wherever you touch.
How can I recognize continuous user touch in Swift code? By continuous I mean that the user has her finger on the screen. I would like to move a sprite kit node to the direction of user's touch for as long as the user is touching screen.
The basic steps
Store the location of the touch events (touchesBegan/touchesMoved)
Move sprite node toward that location (update)
Stop moving the node when touch is no longer detected (touchesEnded)
Here's an example of how to do that
Xcode 8
let sprite = SKSpriteNode(color: SKColor.white, size: CGSize(width:32, height:32))
var touched:Bool = false
var location = CGPoint.zero
override func didMove(to view: SKView) {
/* Add a sprite to the scene */
sprite.position = CGPoint(x:0, y:0)
self.addChild(sprite)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
touched = true
for touch in touches {
location = touch.location(in:self)
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
location = touch.location(in: self)
}
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
// Stop node from moving to touch
touched = false
}
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
if (touched) {
moveNodeToLocation()
}
}
// Move the node to the location of the touch
func moveNodeToLocation() {
// Compute vector components in direction of the touch
var dx = location.x - sprite.position.x
var dy = location.y - sprite.position.y
// How fast to move the node. Adjust this as needed
let speed:CGFloat = 0.25
// Scale vector
dx = dx * speed
dy = dy * speed
sprite.position = CGPoint(x:sprite.position.x+dx, y:sprite.position.y+dy)
}
Xcode 7
let sprite = SKSpriteNode(color: SKColor.whiteColor(), size: CGSizeMake(32, 32))
var touched:Bool = false
var location = CGPointMake(0, 0)
override func didMoveToView(view: SKView) {
self.scaleMode = .ResizeFill
/* Add a sprite to the scene */
sprite.position = CGPointMake(100, 100)
self.addChild(sprite)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
/* Start moving node to touch location */
touched = true
for touch in touches {
location = touch.locationInNode(self)
}
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
/* Update to new touch location */
for touch in touches {
location = touch.locationInNode(self)
}
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
// Stop node from moving to touch
touched = false
}
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
if (touched) {
moveNodeToLocation()
}
}
// Move the node to the location of the touch
func moveNodeToLocation() {
// How fast to move the node
let speed:CGFloat = 0.25
// Compute vector components in direction of the touch
var dx = location.x - sprite.position.x
var dy = location.y - sprite.position.y
// Scale vector
dx = dx * speed
dy = dy * speed
sprite.position = CGPointMake(sprite.position.x+dx, sprite.position.y+dy)
}
The most difficult thing about this process is tracking single touches within a multitouch environment. The issue with the "simple" solution to this (i.e., turn "istouched" on in touchesBegan and turn it off in touchesEnded) is that if the user touches another finger on the screen and then lifts it, it will cancel the first touch's actions.
To make this bulletproof, you need to track individual touches over their lifetime. When the first touch occurs, you save the location of that touch and move the object towards that location. Any further touches should be compared to the first touch, and should be ignored if they aren't the first touch. This approach also allows you to handle multitouch, where the object could be made to move towards any finger currently on the screen, and then move to the next finger if the first one is lifted, and so on.
It's important to note that UITouch objects are constant across touchesBegan, touchesMoved, and touchesEnded. You can think of a UITouch object as being created in touchesBegan, altered in touchesMoved, and destroyed in touchesEnded. You can track the phase of a touch over the course of its life by saving a reference to the touch object to a dictionary or an array as it is created in touchesBegan, then in touchesMoved you can check the new location of any existing touches and alter the object's course if the user moves their finger (you can apply tolerances to prevent jitter, e.g., if the x/y distance is less than some tolerance, don't alter the course). In touchesEnded you can check if the touch in focus is the one that ended, and cancel the object's movement, or set it to move towards any other touch that is still occurring. This is important, as if you just check for any old touch object ending, this will cancel other touches as well, which can produce unexpected results.
This article is in Obj-C, but the code is easily ported to Swift and shows you what you need to do, just check out the stuff under "Handling a Complex Multitouch Sequence": https://developer.apple.com/library/ios/documentation/EventHandling/Conceptual/EventHandlingiPhoneOS/multitouch_background/multitouch_background.html
Below is the code to drag the node around on X position (left and right), it is very easy to add Y position and do the same thing.
let item = SKSpriteNode(imageNamed: "xx")
var itemXposition = 50
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
// updates itemXposition variable on every touch
for touch in touches {
let location = touch.location(in: self)
itemXposition = Int(location.x)
}
}
// this function is called for each frame render, updates the position on view
override func update(_ currentTime: TimeInterval) {
spaceShip.position = CGPoint(x: self.itemXposition , y: 50 )
}