Mark Cunningham

Game Programming with Code Angel

Learn how to code in Python on Raspberry Pi or PC

Mark Cunningham
Edinburgh, Scotland
ISBN 978-1-4842-5304-5e-ISBN 978-1-4842-5305-2
https://doi.org/10.1007/978-1-4842-5305-2
© Mark Cunningham 2020
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While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein.
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To Mum and Dad

For recoginizing that a Space Invaders habit and a ZX81 might eventually lead somewhere in 40 years’ time…

Table of Contents

Chapter 1:​ Introduction 1
Coding a game 3
Python and Pygame 4
Choosing an IDE 4
Python IDLE 4
Thonny 5
PyCharm Edu 5
Bugs and debugging 5
Common mistakes 6
Indentation 6
Variable and function names 7
Case 7
Brackets and quotes 7
Missing colons 8
Comments 8
Time to get started… 8
Chapter 2:​ Forest Bomber part 1:​ A first level 9
Getting started 9
Step 1:​ Set up the game environment 11
Step 2:​ Initialize variables 13
Score and lives 13
Forest list variable 16
Step 3:​ Display the background 18
Step 4:​ Draw the forest 20
Using math to calculate tree position 21
Deciding which trees to draw 22
Summary 24
Chapter 3:​ Forest Bomber part 2:​ Is it a bird…?​ 25
Step 5:​ Draw the plane 25
Step 6:​ Move the plane 27
Fly across the screen 27
Fly down the screen 29
Chapter 4:​ Forest Bomber part 3:​ Bombs away… 33
Step 7:​ Drop the bomb 34
Key presses 34
Move the bomb 37
Exploding trees 40
Ground level 42
Step 8:​ Game over/​level up 43
Chapter 5:​ Forest Bomber part 4:​ Wrapping it up 49
Step 9:​ Display scoreboard and messages 50
Scoreboard background 50
Display the score 52
Display the level 53
Display the high score 54
Display messages 55
Chapter 6:​ Snapper part 1:​ In the woods 61
Getting started 61
Step 1:​ Set up the game environment 63
Step 2:​ Initialize variables 65
Boolean variables 65
Dictionaries 66
Step 3:​ Display the background 69
Chapter 7:​ Snapper part 2:​ Say cheese 71
Step 4:​ Draw and move the camera 72
The mouse pointer 72
Step 5:​ Show an animal 74
Using the dictionary 74
Step 6:​ Hide an animal 77
Setting a timer 78
Rectangles 80
Show another animal 81
Building a function 82
Chapter 8:​ Snapper part 3:​ Snapped 87
Step 7:​ Take a photograph 88
Rectangles collide 89
Snapped it! 91
Oops, missed! 92
Hit or miss?​ 93
Step 8:​ Game over 95
Step 9:​ Scoreboard 96
Chapter 9:​ Alien Invasion part 1:​ Under attack 101
Getting started 101
Step 1:​ Set up the game environment 103
Step 2:​ Initialize variables 106
Step 3:​ Display the background 108
Chapter 10:​ Alien Invasion part 2:​ Missile launch is Go 109
Step 4:​ Drive the base 109
Comparison operators 111
Step 5:​ Launch missile 112
Move the missile 114
Display missile 115
Logical operators 115
Chapter 11:​ Alien Invasion part 3:​ And they came from outer space 119
Step 6:​ Move UFOs 120
Stay on screen 122
Time for a change 123
Call the function 124
Display UFOs 124
Chapter 12:​ Save the planet 127
Step 7:​ Shoot UFOs 128
Catching some rays 132
Step 8:​ Game over 135
Step 9:​ Scoreboard 137
Chapter 13:​ Golf part 1:​ On the tee 139
Getting started 139
Step 1:​ Set up the game environment 140
Step 2:​ Initialize variables 143
Variable naming conventions 144
Constants 144
Step 3:​ Display background 145
Step 4:​ Display flag 146
Chapter 14:​ Golf part 2:​ On the green 149
Step 5:​ Power meter 149
Step 6:​ Move the ball 152
More about lists 154
Update ball location 156
Draw the ball 158
Chapter 15:​ Golf part 3:​ It’s in the hole 161
Step 7:​ In the hole 162
Joining strings 163
Drawing Pygame shapes 163
Centering text 164
Drawing Pygame text 165
In the hole message 165
Step 8:​ Scoreboard 167
Fixed loops 169
Display the scoreboard 170
Wrapping up 171
Index 173

About the Author and About the Technical Reviewer

About the Author

Mark Cunningham

is the founder of Code Angel and a Computing Science teacher with over 20 years experience teaching in Scotland. Working with high school students, Mark has learned which coding concepts new coders find difficult to understand, learn, and master. He has recognized that students want to learn to code by writing programs which will motivate and engage them. His work with Code Angel has allowed him to take his teaching beyond the classroom and reach a much wider audience online. Mark is also the co-founder of Hashtag Learning who develop online resources for schools.

 

About the Technical Reviewer

Massimo Nardone

has more than 22 years of experiences in Security, Web/Mobile Development, Cloud, and IT Architecture. His true IT passions are Security and Android.

He has been programming and teaching how to program with Android, Perl, PHP, Java, VB, Python, C/C++, and MySQL for more than 20 years.

He holds a Master of Science in Computing Science from the University of Salerno, Italy.

He has worked as a Project Manager, Software Engineer, Research Engineer, Chief Security Architect, Information Security Manager, PCI/SCADA Auditor, and Senior Lead IT Security/Cloud/SCADA Architect for many years.

His technical skills include Security, Android, Cloud, Java, MySQL, Drupal, Cobol, Perl, Web and Mobile Development, MongoDB, D3, Joomla, Couchbase, C/C++, WebGL, Python, Pro Rails, Django CMS, Jekyll, Scratch, and so on.

He currently works as Chief Information Security Officer (CISO) for Cargotec Oyj.

He worked as Visiting Lecturer and Supervisor for exercises at the Networking Laboratory of the Helsinki University of Technology (Aalto University). He holds four international patents (PKI, SIP, SAML, and Proxy areas).

Massimo has reviewed more than 40 IT books for different publishing companies, and he is the coauthor ofPro Android Games (Apress, 2015).

 
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