CODEWITHSUNDEEP
swiftsprite-kit
KeepItSimple
KeepItSimple

Reputation: 133

How to prevent a node from speeding up too much?

I have nodes that fall from the top of my scene and are set to speed up like so:

   var droptime: NSTimeInterval = 20.5

 class GamePlayScene: SKScene, SKPhysicsContactDelegate {
       droptime = 20.5

    runAction(SKAction.repeatActionForever(
        SKAction.sequence([
            SKAction.runBlock(array),
            SKAction.waitForDuration(1.6)])))





  func array()  {

  let colorCount = 5

    let index=Int(arc4random_uniform(UInt32(colorCount)))

    let dots = SKSpriteNode(imageNamed: "Color\(index+1)")
    dots.position = CGPointMake(150, 600)
    dots.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(45, 45))
    dots.physicsBody?.dynamic = true
    dots.physicsBody?.affectedByGravity = false
    for i in 0..<5 {
        dots.physicsBody?.categoryBitMask = UInt32(0x1 << index)
        dots.physicsBody?.contactTestBitMask = UInt32(0x1 << index)

    }
   addChild(dots)

             droptime -= 1.09
          dots.size = CGSizeMake(45, 45)
    dots.runAction(
        SKAction.moveByX(0, y: -1600,
            duration: NSTimeInterval(droptime)))


}

}

And as time goes on, obviously they keep speeding up and eventually fall too fast for gameplay. I was wondering if there was a way that once they reach a certain speed, that they'll just stay at that speed so that they don't end up falling obnoxiously fast and the game becomes unplayable.

Upvotes: 1

Views: 36

Answers (2)

Chris Slowik
Chris Slowik

Reputation: 2879

You could put a max on the drop time.

let minInterval = 5.0 //min interval of 5 sec
//minInterval is your smallest time interval desired - that's how you can limit speed
droptime = max(droptime - 1.09, minInterval)

Upvotes: 1

kevchoi
kevchoi

Reputation: 434

You can have an if case that checks the droptime and decrements it only if it is greater than the some minimum time.

if droptime > minTime:
    droptime -= 1.09

Upvotes: 0

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