msqar msqar - 1 year ago 99
iOS Question

How do i get the real center of a SKSpriteNode in Swift 2?

I'm trying to figure out the center of my Sprite, i used a soccer ball sprite, changed size to be 120 by 120.
I managed to get the touch location.

The way to get the center should be sprite.origin.x + (sprite.width / 2), but for some reason, the value i'm getting is non sense. Because no matter where i touch the ball, the touch location.x is always smaller than the Sprite center, even though for example I touched on the right side of the ball, so that way location.x should be > than

This is the little code to get ball's center point

let ballCenter = CGVectorMake(ball.position.x + (ball.frame.width / 2),
ball.position.y + (ball.frame.height / 2))

But when I print the results like this, is always going to the "true" case.

if location.x < ballCenter.dx {
print("touched on left of ball ", location.x, location.y)
print("touched on right of ball ", location.x, location.y)

This is driving me crazy, can anyone help me to understand this? The sprite origin isn't in the bottom-left?

Also, why the scene frame is so small? I see that my screen Width is 375.0 and screen Height is 667.0 when i'm using an iPhone 6S, shouldn't it be bigger? This is so confusing.

Thanks in advance.

Answer Source

A SpriteNode's origin is in the center of the sprite by default. If you want to get the center of the node, just use let ballCenter = sprite.position - this will give you a CGPoint to work with. You can then access the x and y coordinates by using ballCenter.x and ballCenter.y.

Also, if you're wanting to create a point like you're currently doing with ballCenter, use CGPointMake() instead of CGVectorMake().

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