I put a circular attack oval on a blue space ship and, if any SKSpriteNode enters the SKShapeNode (attack oval) the blue space ship can fire on the SKSpriteNode. The problem is that I can't figure out how to do the detection. I have tried physical bodies but, I can't have contact without having a collision.
Here is an example. I want the purple/blue attack circle to detect A,B,C,D,E
Here is the code I think you will need. RSSprite is short for red ship sprite
blueShip.position = CGPoint(x: 800, y: 400)
attackCircle = SKShapeNode(ellipseOfSize: CGSize(width: 1000, height: 400))
attackCircle.position = CGPoint(x: blueShip.position.x, y: blueShip.position.y)
RSSprite!.position = CGPoint(x: 200, y: 700)
RSSprite!.physicsBody = SKPhysicsBody(rectangleOfSize: RSSprite!.size)
In the update method you can check for an intersection of 2 nodes like this:
if([nodeA intersectsNode:nodeB]) {
// you have a collision
}
Related
I'm using SpriteKit in Swift (3.0).
I store all the SKSprites nodes in my game as children of a "world" node
However when I apply a velocity to one of those nodes, they move relative to the screen, and not "world" (world is rotating, moving, etc.)
Heres how I implement it:
let movingObject = SKSpriteNode(color: UIColor.green, size: CGSize(width: 10, height: 10))
movingObject.physicsBody = SKPhysicsBody(rectangleOf: movingObject.size)
movingObject.physicsBody?.velocity = CGVector(dx: 0, dy: 200)
world.addChild(movingObject)
I need my node's velocity to move in respect to its parent, not the scene/view it is in. How do I do that?
Thanks!
I'm trying to build a small spriteKitGame. I have been trying to use the function to move a couple of tank sprite nodes to a specific point.
Attached below is the code snippet.
let tankSpawn = CGPoint(x: self.size.width , y: 70);
tank.position = tankSpawn;
tank.zPosition = 3.0;
let targetPoint = CGPoint(x: -tank.size.width/2, y: tank.position.y);
let actionMove = SKAction.move(to: targetPoint, duration: TimeInterval(tankMoveDuration))
This is my result. They are spawning at the correct point ( 70units high ), but are going down as shown.
I want them to go in a straight line. I set the target points y as a constant. I have no idea why they are going to wards some bottom source.
I have similar code for planes that spawn above( which are working perfectly ).
let plane = SKSpriteNode(imageNamed: "SpaceShip");
let planeMoveDuration = 3.0
let planeSpawn = CGPoint(x: self.size.width , y: self.size.height/2);
plane.position = planeSpawn;
plane.zPosition = 3.0;
let actionMove = SKAction.move(to: CGPoint(x: -plane.size.width/2, y: plane.position.y), duration: TimeInterval(planeMoveDuration))
I have no idea what my mistake here is.
I have tried changing the y co ordinate of the target to tank.position.y, but it doesn't work.
Are they falling under gravity? A sprite-kit scene with physics bodies will have gravity and things will fall unless you take specific action to avoid this.
It's easily done - you're developing your game, you have basic elements on screen and movement etc is all working well, then you want to add some collision detection so you add physicsBodies and then whoosh - where'd my sprites go?
I want to create a ring with a 3D effect using Sprite Kit. (SEE IMAGES)
I tried subclassing a SKNode and adding two nodes as children. (SEE CODE)
One node was a complete SKShapeNode ellipse, and the other was half ellipse using SKCropNode with a higher zPosition.
It looks good, but the SKCropNode increases the app CPU usage from 40% to 99%.
Any ideas on how to reduce the SKCropNode performance cost, or any alternative to create the same ring 3D effect?
class RingNode: SKNode {
let size: CGSize
init(size: CGSize, color: SKColor)
{
self.size = size
self.color = color
super.init()
ringPartsSetup()
}
private func ringPartsSetup() {
// LEFT PART (half ellipse)
let ellipseNodeLeft = getEllipseNode()
let leftMask = SKSpriteNode(texture: nil, color: SKColor.blackColor(), size: CGSize(
width: ellipseNodeLeft.frame.size.width/2,
height: ellipseNodeLeft.frame.size.height))
leftMask.anchorPoint = CGPoint(x: 0, y: 0.5)
leftMask.position = CGPoint(x: -ellipseNodeLeft.frame.size.width/2, y: 0)
let leftNode = SKCropNode()
leftNode.addChild(ellipseNodeLeft)
leftNode.maskNode = leftMask
leftNode.zPosition = 10 // Higher zPosition for 3D effect
leftNode.position = CGPoint(x: -leftNode.frame.size.width/4, y: 0)
addChild(leftNode)
// RIGHT PART (complete ellipse)
let rightNode = getEllipseNode()
rightNode.position = CGPoint(x: 0, y: 0)
rightNode.zPosition = 5
addChild(rightNode)
}
private func getEllipseNode() -> SKShapeNode {
let ellipseNode = SKShapeNode(ellipseOfSize: CGSize(
width: size.width,
height: size.height))
ellipseNode.strokeColor = SKColor.blackColor()
ellipseNode.lineWidth = 5
return ellipseNode
}
}
You've got the right idea with your two-layer approach and the half-slips on top. But instead of using a shape node inside a crop node, why not just use a shape node whose path is a half-ellipse? Create one using either CGPath or UIBezierPath API — use a circular arc with a transform to make it elliptical — then create your SKShapeNode from that path.
You may try converting your SKShapeNode to an SKSpriteNode. You can use SKView textureFromNode: (but we aware of issues with scale that require you to use it only after the node has been added to the view and at least one update cycle has run), or from scratch using an image (created programatically with a CGBitmapContext, of course).
I simply have put a square shape node onto a scene, and made the physicsBody for the scene be the edge of the screen. I turned on the physics view so you can see all of the physics stuff. The square has a physics body around it, as does the border of the scene. However, when the square runs into the border, nothing happens. The square just passes straight through. Here is how I initialize the square:
let rect1 = CGRect(x: 100, y: 100, width: 50, height: 50)
let square = Square(rect: rect1)
square.fillColor = UIColor.blackColor()
square.zPosition = 200
square.physicsBody = SKPhysicsBody(edgeLoopFromRect: rect1)
square.physicsBody?.allowsRotation = false
square.physicsBody?.affectedByGravity = false
square.physicsBody?.restitution = 0.4
self.addChild(square)
Here is how I initialize the physics body for the scene:
let physicsBody = SKPhysicsBody(edgeLoopFromRect: view.bounds)
self.physicsBody = physicsBody
Very similar code has worked for me on other games, so I am not sure why no collisions happen. Any help is greatly appreciated thanks!
The movement of the balls must be caused by physics rather than just setting the position. The issue was fixed through using impulses to move the balls which then made them collide with the various objects.
Hi I'm working in Sprite Kit and I'm trying to make a sprite move from one point to another. Currently, I am able to do this with SkAction.moveTo and the sprite moves in a straight line. However, I'm curious as to if it would be possible for the sprite to move in a parabola instead of a straight line as it reaches its destination. All help is appreciated.
Here is a simple way to create a parabolic UIBezierPath:
let path = UIBezierPath()
path.moveToPoint(CGPointZero)
path.addQuadCurveToPoint(CGPoint(x: 100, y: 0), controlPoint: CGPoint(x: 50, y: 200))
This looks like this when graphed in a Playground:
For your sprite to move with this path, use this code:
mySprite.runAction(SKAction.followPath(path.CGPath, duration: 1.0))
To fine-tune the parabola, change the constants in the code above to change the path.
I've been drawn quite awhile in this problem. I would like to share a bit about my experience about parabola movement in SKAction.
This is the code for Swift 3
let path = UIBezierPath()
path.move(to: CGPoint(x:0, y:0))
path.addQuadCurve(to: CGPoint(x: 100, y: 0), controlPoint: CGPoint(x: 50, y: 200))
let parabolaAction = SKAction.follow(path.cgPath, duration: 1)
Your Sprite Node must have been placed in a certain position.
The second line means that the Sprite Node will move by x:0 and y:0. It's a relative movement. The problem why I'm struggling was considering that the Point is the new absolute position. But it's not.
The third line means that the Sprite Node will move by x:100, y:0 into a new position with the help of control point. Control point is the top coordinate like what erdekhayser shows.
If you set points in path with Sprite Node position + certain value then your Sprite Node might be positioned off the scene.
Hope this helps understanding UIBezierPath for parabola movement.