CODEWITHSUNDEEP
iosswiftsprite-kit
Brandon Tomblinson
Brandon Tomblinson

Reputation: 316

Making a sprite appear at a random y point

Im trying to create a sprite and give it a random y position, currently some of the sprites spawn out of view or are partly cut off. Which part do I have wrong(the screen is in landscape) and viewFrame is passed into the function and is the frame of the game scene

 let enemyShip = SKSpriteNode(imageNamed: "enemyShip")
        enemyShip.position = CGPointMake(viewFrame.maxX + enemyShip.size.height, CGFloat(arc4random_uniform(UInt32(viewFrame.maxY - enemyShip.size.height)) + UInt32(enemyShip.size.height)))

Upvotes: 1

Views: 80

Answers (1)

hamobi
hamobi

Reputation: 8130

try this

func random(min min: CGFloat, max: CGFloat) -> CGFloat {
    assert(min < max)
    return CGFloat(Float(arc4random()) / 0xFFFFFFFF) * (max - min) + min
}

let x = random(
    min: enemyShip.size.width/2,
    max: self.size.width - enemyShip.size.width/2
)

let y = random(
    min: enemyShip.size.height/2,
    max: self.size.height - enemyShip.size.height/2
)

enemyShip.position = CGPointMake(x, y)

Upvotes: 3

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