Book Image

Android NDK Game Development Cookbook

Book Image

Android NDK Game Development Cookbook

Overview of this book

Android NDK is used for multimedia applications which require direct access to a system's resources. Android NDK is also the key for portability, which in turn provides a reasonably comfortable development and debugging process using familiar tools such as GCC and Clang toolchains. If your wish to build Android games using this amazing framework, then this book is a must-have.This book provides you with a number of clear step-by-step recipes which will help you to start developing mobile games with Android NDK and boost your productivity debugging them on your computer. This book will also provide you with new ways of working as well as some useful tips and tricks that will demonstrably increase your development speed and efficiency.This book will take you through a number of easy-to-follow recipes that will help you to take advantage of the Android NDK as well as some popular C++ libraries. It presents Android application development in C++ and shows you how to create a complete gaming application. You will learn how to write portable multithreaded C++ code, use HTTP networking, play audio files, use OpenGL ES, to render high-quality text, and how to recognize user gestures on multi-touch devices. If you want to leverage your C++ skills in mobile development and add performance to your Android applications, then this is the book for you.
Table of Contents (16 chapters)
Android NDK Game Development Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Implementing user interaction within a game loop


In the previous recipes we learned how to render the game environment and implement the game logic. One more important aspect of the development needs our attention: the user interaction.

Getting ready

Check out the file main.cpp in the project 1_Game for the full implementation.

How to do it…

We need to implement some functions to move the currently falling shape:

  1. Enforce the game field constraints while moving a figure left or right:

    bool MoveFigureLeft()
    {
      if ( g_Field.FigureFits( g_GS.FCurX - 1, g_GS.FCurY,
      g_CurrentFigure ) )
      {
        g_GS.FCurX--;
        return true;
      }
      return false;
    }
  2. The source code of MoveFigureRight() is similar to MoveFigureLeft(). The code of MoveFigureDown() needs to update the score once the shape has hit the ground:

    bool MoveFigureDown()
    {
      if ( g_Field.FigureFits( g_GS.FCurX, g_GS.FCurY + 1,
      g_CurrentFigure ) )
      {
        g_GS.FScore += 1 + g_GS.FLevel / 2;
        g_GS.FCurY++;
        return true;
      }
      return false;...