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Cocos2d-x cookbook

You're reading from Cocos2d-x cookbook Over 50 hands-on recipes to help you efficiently administer and maintain your games with Cocos2d-x

Product type Paperback

Published in Nov 2015

Publisher

ISBN-13 9781783284757

Length 254 pages

Edition 1st Edition

Languages

C++

Tools

Cocos2d-x

Concepts

2D Game Development

Author (1):

Akihiro Matsuura

View More author details

Table of Contents (13) Chapters

Preface

1. Getting Started with Cocos2d-x FREE CHAPTER

2. Creating Sprites

3. Working with Labels

4. Building Scenes and Layers

5. Creating GUIs

6. Playing Sounds

7. Working with Resource Files

8. Working with Hardware

9. Controlling Physics

10. Improving Games with Extra Features

11. Taking Advantages

Index

Getting dpi

There are a lot of dpi (dots per inch) variations for each device. You can prepare several kinds of images by resolution. You might want to change an image by the dpi running on the device. In this recipe, if you would like to get the dpi that your game is running on, you need to use the Cocos2d-x function.

How to do it...

You can get dpi of the device game is executing on, by using the Device::getDPI method as follows:

int dpi = Device::getDPI(); 
CCLOG("dpi = %d", dpi);

How it works...

In fact, we checked the dpi of some devices. To use the dpi information, you can further adjust the multiscreen resolution.

Device	Dpi
iPhone 6 Plus	489
iPhone 6	326
iPhone 5s	326
iPhone 4s	326
iPad Air	264
iPad 2	132
Nexus 5	480

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Authors (1)

Akihiro Matsuura

Akihiro Matsuura

Akihiro Matsuura has five years of experience as a Cocos2d-x developer. He founded his own company called Syuhari, Inc. five years ago. He has more than 20 years of experience as a programmer. He has written three technical books in Japanese. He also authored Cocos2d-x Recipe Book, Shuwa System Co., Ltd , the first Cocos2d-x book in Japan, iPhone SDK Recipe Book , Shuwa System Co., Ltd, and Cocos2d-x Guide Book, Mynavi Corporation. 7 years ago, iPhone3G was released in Japan. This was when he began to develop its software and ended up developing a lot of applications for iPhone. First, he developed them using Cocos2d for iPhone; however, he had to port to Android. So, he decided to use Cocos2d-x to develop cross-platform applications. At that time, Cocos2d-x was at version 1.0. Since then, he has developed a lot of applications using Cocos2d-x.

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