Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Arrow up icon
GO TO TOP
Swift Game Development

You're reading from   Swift Game Development Learn iOS 12 game development using SpriteKit, SceneKit and ARKit 2.0

Arrow left icon
Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781788471152
Length 434 pages
Edition 3rd Edition
Languages
Tools
Arrow right icon
Authors (2):
Arrow left icon
Siddharth Shekar Siddharth Shekar
Author Profile Icon Siddharth Shekar
Siddharth Shekar
Stephen Haney Stephen Haney
Author Profile Icon Stephen Haney
Stephen Haney
Arrow right icon
View More author details
Toc

Table of Contents (20) Chapters Close

Preface 1. Designing Games with Swift 2. Sprites, Camera, Action! FREE CHAPTER 3. Mix in the Physics 4. Adding Controls 5. Spawning Enemies, Coins, and Power-Ups 6. Generating a Never-Ending World 7. Implementing Collision Events 8. Polishing to a Shine – HUD, Parallax Backgrounds, Particles, and More 9. Adding Menus and Sounds 10. Standing out in the Crowd with Advanced Features 11. Introduction to SceneKit 12. Choosing a Monetization Strategy 13. Integrating with Game Center 14. Introduction to Spritekit with ARKit 15. Introduction to Scenekit with ARKit 16. Publishing the Game on the App Store 17. Multipeer Augmented Reality Other Books You May Enjoy Index

The story on positioning

SpriteKit uses a grid of points to position nodes. In this grid, the bottom left corner of the scene is (0,0), with a positive x-axis to the right and a positive y-axis to the top.

Similarly, on the individual sprite level, (0,0) refers to the bottom-left corner of the sprite, while (1,1) refers to the top-right corner.

Alignment with anchor points

Each sprite has an anchorPoint property, or an origin. The anchorPoint property allows you to choose which part of the sprite aligns to the sprite's overall position.

Note

The default anchor point is (0.5,0.5), so a new SKSpriteNode centers perfectly on its position.

To illustrate this, let's examine the blue square sprite we just drew on the screen. Our sprite is 50 points wide and 50 points tall, and its position is (150,150). Since we have not modified the anchorPoint property, its anchor point is (0.5,0.5). This means that the sprite will be perfectly centered over the (150,150) position on the scene's grid...

You have been reading a chapter from
Swift Game Development - Third Edition
Published in: Sep 2018
Publisher: Packt
ISBN-13: 9781788471152
Register for a free Packt account to unlock a world of extra content!
A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.
Unlock this book and the full library FREE for 7 days
Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of
Renews at $19.99/month. Cancel anytime
Banner background image