Game Development With Python and Pygame

GAME DEVELOPMENT
WITH PYTHON AND
PYGAMESEPT 2017
CHARIZA BACLOR PLADIN
Data Analyst – Accenture Inc.
chariza.b.pladin@accenture.com

AGENDA
• Basics of Game Design
• Exploring Python
• Introducing PyGame
• Understanding Game Loop
• Setting up a Skeleton
• Working with Sprites
• Play with Events
• Q/A
Game Development with Python and PyGame Sept 2017

BASIC OF TO GAME DESIGN

THE “FUN”DAMENTALS
In making a game, you become an
entertainer, not a puppet
master bent on world
domination.

KNOW YOUR AUDIENCE
Sturgeon’s Law: 99% of
everything is crap.
Pay attention to what they like
and what they don’t like.

KNOW YOUR GENRE
What players expect from your
game is the deciding factor in
whether it will be a success or
a failure.

KNOW YOUR SELF
Ask yourself.What
makes a game fun?

EMPOWERING PLAYERS
“Take me to a place I’ve never
been, make me something I
could never be, and let me do
things
I could never do.”

Nature of Power
Ability or official capacity to exercise
control. By understanding the nature of
power, and which types of power appeal to
which types of players, you can begin to
fine-tune your game design technique.

A Small Lesson on the Nature of
Power(cont.)
• Creative Power
• Destructive Power
• Manipulative Power

CREATIVE POWER
Pros
• brings a sense of accomplishment that
is extremely rewarding.
• Games which is more of a ‘toy’ than a
competition.
Cons
• complex and time consuming, and can
turn off players who want instant
gratification.

DESTRUCTIVE POWER
Pros
• most satisfying in an immediate
sense, and thus are the quickest to
empower.
Cons
• Game type of shallowest learning
curve.

MANIPULATIVE POWER
• most subtle power, and its correct
use rewards the player by making
him feel clever and proud of that
cleverness.

EXPLORING PYTHON

Install Python
For Windows
http://www.python.org > Download link > Get the latest ver.

Install Python
For Mac OS X
The installation for Mac OS X is similar. Instead of downloading
the .msi file from the Python website, download the .dmg Mac
Installer Disk Image file instead.The link to this file will look
something like "Mac Installer disk image (python_version)" on the
"Download Python Software" web page.
Ubuntu and Linux
you can install Python by opening a terminal window (click on
Applications > Accessories >Terminal) and entering
sudo apt-get install <python_ver> then pressing Enter.

Install Python
Open IDLE (Interactive DeveLopment Environment. )

INTRODUCING PYGAME

Pygame
• A set of Python modules to help write games; “game
library”.
• Deals with media nicely (pictures, sound)
• Interacts with user nicely (keyboard, joystick, mouse
input)
• Lots of more advanced features for working with
graphics, etc.

Pygame

History of Pygame
Pygame is built on another game creation library called
Simple DirectMedia Layer (SDL). SDL was written
by Sam Lantinga while he was working for Loki Software (a
now-defunct game company) to simplify the task
of porting games from one platform to another. It provided
a common way to create a display on multiple
platforms as well as work with graphics and input devices.
Because it was so simple to work with, it became
very popular with game developers when it was released in
1998, and has since been used for many hobby
and commercial games.

Installing Pygame
Pygame does not come with Python. Like
Python, Pygame is available for free.You will
have to download and install Pygame, which is
as easy as downloading and installing the
Python interpreter.

Installing Pygame
pip install pygame
Windows
'pip' is not recognized as an internal or external command,
operable program or batch file
Error may encounter
C:/Python34/Scripts/pip install pygame
Use Full path

Installing Pygame
For Mac OS X
Mac OS has historically had a lot of trouble with
Python GUI-related modules in all forms.This is an ongoing
campaign, so your best bet is to see the latest installation
instructions from
http://pygame.org/wiki/macintosh.
pip install C:/Users/H/Downloads/pygame-1.9.2a0-cp34-none-
win32.whl

GUI vs. CLI
Command-Line Interface (CLI)
Your Python program can display text on the screen and let the user type
in text from the keyboard. These programs are somewhat limited
because they can’t display graphics, have colors, or use the mouse.
Graphical User Interface (GUI)
Pygame provides functions for creating programs with a GUI. Instead of
a text-based CLI, programs with a graphics-basedGUI can show a
window with images and colors.

Pygame Packages
Just like how Python comes with several modules like
random, math, or time that provide additional
functions for your programs, the Pygame framework
includes several modules with functions for drawing
graphics, playing sounds, handling mouse
input, and other things.

Pygame Packages

Pygame Packages
*For complete documentation on the Pygame modules, see
http://pygame.org/docs/.

Understanding Game Loop
PROCESS
INPUT
UPDATE
GAME
RENDER
FPS

Setting up a Pygame Program
(Skeleton)

Line 1 is a simple import statement that imports the PyGame and sys modules so
that our program can use the functions in them. All of the Pygame functions
dealing with graphics, sound, and other features that Pygame provides are in the
PyGame module.
<Module name> import *, you can skip the <module name>. portion and simply
use function name().

Line 4 is the command which always needs to be called after importing
the PyGame module and before calling any other Pygame function.
Line 5 is a call to the pygame.display.set_mode() function, which returns
the pygame. Surface object for the window.
Notice that we pass a tuple value of two integers to the function: (400,
300).This tuple tells the set_mode() function how wide and how high to
make the window in pixels. (400, 300) will make a window with a width of
400 pixels and height of 300 pixels.

Line 6 sets the caption text that will appear at the top of the window by
calling the pygame.display.set_caption() function.The string value 'Hello
World!' is passed in this function call to make that text appear as the
caption:
Line 7 is a while loop that has a condition of simply the valueTrue.The
only way the program execution will ever exit the loop is if a break
statement is executed.

Line 12 calls the pygame.display.update() function, which draws the
Surface object returned by pygame.display.set_mode() to the screen.
Since the Surface object hasn’t changed, the same black image is
redrawn to the screen each time pygame.display.update() is called.

SURFACE
Most of the game elements you see are represented as
Surfaces.
display.set_mode((x, y))
creates your canvas – it returns a Surface object.
Useful surface methods:
fill("color") fills the surface object it's called on.
blit(surface, area) paints surface onto the object blit is called on in
the rectangle bounded by the area tuple.
screen.blit(ball, (50,50))

RECT
Objects that store rectangular coordinates.
.get_rect()
on a surface to get its bounding box.
Rectangle methods/variables:
.center
holds the object's center as a tuple
.colliderect(target)
returnsTrue if the parameter overlaps with the object
.collidepoint(target)
returnsTrue if the target point overlaps with the object.

MEDIA
• Loading an image:
img = image.load("file.gif").convert()
• Getting a bounding rectangle:
img_rect = img.get_rect()
• Loading and playing a sound file:
mixer.Sound("file.wav").play()

SPRITE
Class visible game objects inherit from.

SPRITE
They're just objects: initialize them
ball = Ball()
Create a group of sprites in main
sprites = RenderPlain(sprite1, sprite2)
Groups know how to draw and update
sprites.update()
sprites.draw(surface)

EVENTS
User input such as clicking, moving mouse or key presses.
Add more branches to test the result of event.poll().
SAMPLE EVENTTRIGGER:
– QUIT
– MOUSEBUTTONDOWN
– JOYBUTTONDOWN
•Testing for the letter ‘d’ being pressed using KEYDOWN
if e.type == KEYDOWN:
if e.key == K_d:

TEXT
• f = font.Font(font, size) goes before your game loop
f = font.Font(None, 25)
• text = Font.render(text, antialias, color)
text = f.render("Hello!", True,Color("green"))
Returns a surface
• Must be blit, just like any other surface
screen.blit(t, (320, 0))

Ask me about
Pygame

Good Reads
Beginning Python Games Development With
PyGame
- Harrison Kinsley andWill McGugan
InventYour Own Computer Games with Python, 2nd
and 3rd Edition
- Al Sweigart
Making Gameswith Python& Pygame
- Al Sweigart
Pygame 1.5.5 Reference Manual
- Pygame Documentation

PYGAME CHALLENGE
You can make your own game using pygame library.
Your game good to have:
• At least two sprites.
• Interaction between sprites.
• User input from keyboard or mouse.
• Some kind of score displayed.

Game Development With Python and Pygame

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