Creative Greenfoot

Michael Haungs

• Publisher: Packt Publishing
• Year: 2015
• ISBN:
  9781783980390
• Topic: Informatique
• Subtopic: Programmation en Java

About This Book

• Apply a wide variety of game design and programming animation techniques to create immersive interactive applications that use state-of-the-art controllers and input devices
• Quickly learn key concepts in animation, physics, and artificial intelligence to jump-start your journey into creative computing
• Gain a deep understanding of interactive development by working systematically from concept to design with several engaging example applications

Who This Book Is For

This book is for coding students and Java programmers of all levels interested in building engaging, interactive applications with Greenfoot. Familiarity with the very basics of Greenfoot is assumed.

Creative Greenfoot

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Table of Contents

Creative Greenfoot

Credits

About the Author

About the Reviewers

www.PacktPub.com

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Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Downloading the color images of this book

Errata

Piracy

Questions

1. Let's Dive Right in…

The Avoider Game tutorial

Basic game elements

Creating a scenario

Creating our world

Creating our hero

What have we just done?

Adding our hero

Using the mouse as a game controller

Creating the followMouse function

Breaking down the code

Adding enemies

Enemy code

Creating an army

Unbounding the world

Memory management

Your assignment

Next…

Making it a game

Detecting collisions

Adding a game-over screen

Switching scenes

Adding a "play again" button

Adding an introduction screen

Setting the initial screen

Adding a "play" button

Adding background music

Writing the music code

Analyzing the music code

Stop the music

Your assignment

Next…

Enhancing playability

Game scoring

Adding the Counter class

Increasing the score over time

Adding levels

Increasing spawn rates and enemy speed

Increasing difficulty based on the score

Implementing enemy speed increases

Your assignment

Next…

Summary

2. Animation

Revisiting Avoider Game

Image swapping and movement

Using setImage()

Making enemies less happy

Finding assets

Calling setImage() based on Actor location

Using setLocation()

Creating a star field

A blank slate

The Star class

Creating a moving field

Using parallax

Using GreenfootImage

Timing and synchronization

Delay variables

Hurting the avatar

Random actions

Blinking

Triggered events

Adding eyes

Giving our hero sight

Easing

Power-ups and power-downs

Base class

Linear easing

Exponential easing

Sinusoidal easing

Changes to the Avatar class

Changes to the AvoiderWorld class

Avoider Game

Your assignment

Summary

3. Collision Detection

ZombieInvasion interactive simulation

Dynamically creating actors in ZombieInvasionWorld

Creating obstacles

Creating our main actor framework

Creating an explosion

Test it out

Built-in collision detection methods

Detecting a collision with a single object

isTouching() and removeTouching()

Detecting a collision with multiple objects

Detecting multiple objects in range

Time to test it out

Border-based collision detection methods

Detecting single-object collisions at an offset

Detecting multiple-object collisions at an offset

Hidden-sprite collision detection methods

Challenge

Summary

4. Projectiles

Cupcake Counter

How to play

Implementing Cupcake Counter

The CupcakeWorld class

Enemies

Fountains

Turrets

Rewards

Jumpers

Platforms

Test it out

Your assignment

Launching actors

Gravity and jumping

Bouncing

Particle effects

Bullets and turrets

Your assignment

Challenge

Summary

5. Interactive Application Design and Theory

Meaningful play

Complexity

Goals

User conditioning

Storytelling

Fictional worlds

Narrative descriptors

The interactive entertainment iterative development process

Game pitch and initial design

Prototype

Playtest

Evaluation

Refinement

Benefits

Avoider Game

Avoider Game recap

High-score list

Achievement badges

Player conditioning

Storytelling

Adding a story screen

Changing the score

Adding sound effects

Playtesting

Challenge

Additional readings

Summary

6. Scrolling and Mapped Worlds

Chapter scenario examples

Dynamically generated worlds

Side-scrolling

The Rocket class

The CloudsWorld class

Side-scrolling actors

Clouds

Walls

Try it out

Mapped worlds

Side-scrolling

The HikingWorld class

The Hiker class

The ScrollingActor class

Try it out

2D scrolling

The HikingWorld2D class

The Hiker class

The ScrollingActor class

Try it out

Tile-based worlds

Actors as tiles

The HikingWorld class

The Hiker class

The ScrollingActor class

Tiles

The Lake class

Try it out

Other game sprites

Summary

7. Artificial Intelligence

The MazeWorld scenario

The MazeWorld class

The Hiker class

Scrolling actor

The ScrollingObstacle class

Intelligently behaving actors

The ScrollingEnemy class

Randomness

Spider

Behavior heuristics

The Snake class

A* pathfinding

Overview

Algorithm

The Mouse class

Play test

Summary

8. User Interfaces

UIWorld

The Button class

The TextBox class

The Menu class

Heads-up display

Adding a UI to MazeWorld

Adding menus and buttons

Adding a HUD

Implementing game difficulty settings and HUD controls

Summary

9. Gamepads in Greenfoot

Gamepad overview

Windows setup

Connecting your controller

Greenfoot gamepad software

The Greenfoot Gamepad API

Overview

The GamePad and Direction classes

Avoider Game with Gamepad

Try it out

OS X setup/workarounds

Gamepad mapper software

Exporting games with gamepads

Summary

10. What to Dive into Next…

Build something larger

Share your work

Publishing on Greenfoot.org

Desktop application

Exporting as a web page

Explore other input devices

Learn more Java

Summary

Index

Creative Greenfoot

Copyright © 2015 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: April 2015

Production reference: 1230415

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78398-038-3

www.packtpub.com

Credits

Author

Michael Haungs

Reviewers

Thomas Cooper

Keenan Gebze

Foaad Khosmood

Kevin Rowan

Commissioning Editor

Sam Wood

Acquisition Editor

Sam Wood

Content Development Editor

Ar...