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Calling SKAction.follow(..) causes my SKSpriteNode to rotate 90 degrees CW and not stay horizontal as it follows my UIBezierPath?

Graphics & Games SpriteKit Extensions

Created May ’24

Replies 2

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Calling SKAction.follow(..) causes my SKSpriteNode to rotate 90 degrees CW and not stay horizontal as it follows my UIBezierPath?

I have this code (within my GameViewController Class) which implements the following of a SKSpriteNode along a UIBezierPath.

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Please note that a brilliant contributor solved the above challenge by creating a new Class, e.g., class NewClass: NSObject. Nevertheless, I need the solution to appear in an extension of my GameViewController

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func createTrainPath() {
    
    trackRect = CGRect(x: tracksPosX - tracksWidth/2,
                       y: tracksPosY,
                       width: tracksWidth,
                       height: tracksHeight)
    trainPath = UIBezierPath(ovalIn: trackRect)
                  
}   // createTrainPath


func startFollowTrainPath() {
                       
    var trainAction = SKAction.follow(
                                  trainPath.cgPath,
                                  asOffset: false,
                                  orientToPath: true,
                                  speed: theSpeed)
    trainAction = SKAction.repeatForever(trainAction)
    myTrain.run(trainAction, withKey: runTrainKey)

}   // startFollowTrainPath


func stopFollowTrainPath() {
    
    guard myTrain == nil else {
        myTrain.removeAction(forKey: runTrainKey)
        savedTrainPosition = getPositionFor(myTrain, orPath: trainPath)
        return
    }
    
}   // stopFollowTrainPath

Answered by JohnLove in 795396022

-- SOLVED --

The MAGIC centers on

(a) initializing the animated GIFs for display on the “top” every time there is a newGame()

(b) re-creating the animated GIFs with GameScene’s update(..) method.

I owe my "sanity" to both @DonMag on StackOverflow and to John at Apple DTS. Two huge Atta-Boys to these blooming geniuses.

-- end SOLVED --

Boost

May ’24

The Apple Docs state:
If **orientToPath** = true, the node’s **zRotation** property animates so that the node turns to follow the path. If false, the **zRotation** property of the node is unchanged.

I have initialized zRotation = 0.0 (no rotation) and to both +1.0 and -1.0 which initializes the train's zRotation accurately. But as soon as motion begins, the train immediately rotates 90 degrees on its own ??

I have been at this for a good 3-ish weeks, with total failure.

0

Jul ’24

Accepted Answer

-- SOLVED --

The MAGIC centers on

(a) initializing the animated GIFs for display on the “top” every time there is a newGame()

(b) re-creating the animated GIFs with GameScene’s update(..) method.

I owe my "sanity" to both @DonMag on StackOverflow and to John at Apple DTS. Two huge Atta-Boys to these blooming geniuses.

-- end SOLVED --

0

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