PyGame Tutorial | PyGame Python Tutorial For Beginners | Python Certification Training | Edureka

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Agenda

Agenda
Introduction 01
Why
PyGame?
Getting Started 02
Concepts 03
Practical Approach 04
Installing and working
with PyGame
Use-Cases along the way
to understand PyGame
Coding concepts
with PyGame

Making Your Own Game
You decided to make your own game!
Deployment Platform?Language? What sort of game?
But how?

Making Your Own Game
Independency!
I’m a happy gamer!

What is PyGame?

What Is PyGame?
It is a cross-platform set of Python modules designed for writing video gamesWhat is PyGame?
It includes computer graphics and sound libraries designed to be used with Python!
PyGame can handle time, video (both still images and vids), music, fonts, different
image formats, cursors, mouse, keyboard, Joysticks and much much more.
And all of that is very simple.

Installing PyGame

Installing PyGame
Installation is very easy!

Prerequisites for learning PyGame

Prerequisites
Just the workflow in Python

Anatomy of PyGame

Anatomy
Simple Python code!
import pygame
pygame.init()
screen = pygame.display.set_mode((400, 300))
done = False
while not done:
for event in pygame.event.get():
if event.type == pygame.QUIT
:
done = True
pygame.display.flip()
Programming in Python is fun!
It's easier to understand and write PyGame code

Drawing An Object
Simple Python code!
# Add this somewhere after the event pumping and before the
display.flip()
pygame.draw.rect(screen, (0, 128, 255), pygame.Rect(30, 30, 60, 60))
Surface Instance to draw
Tuple for colours (RGB)
Instance – x, y , width, height

Interactivity
Simple Python code!
is_blue = TrueAdd before loop
Modify rectangle code to
pick a color conditionally
Add this to the for loop!
if is_blue: color = (0, 128, 255)
else: color = (255, 100, 0)
pygame.draw.rect(screen, color, pygame.Rect(30, 30, 60, 60))
if event.type == pygame.KEYDOWN and even
t.key == pygame.K_SPACE:
is_blue = not is_blue

Moving Objects
Simple Python code!
Let’s run the code and see where we stand at this point!
up_pressed = pygame.get_pressed()[pygame.K_UP]
Rectangle from previous
frames remain on screen
Moves EXTREMELY fast!

Moving Objects
Let’s fix the output!
Let’s run the code and see where we stand at this point!
screen.fill((0, 0, 0))
Reset screen to black before
drawing rectangle
Fixing frame rate!
clock = pygame.time.Clock()
...
while not done:
...
# will block execution until 1/60 seconds have passed
# since the previous time clock.tick was called.
clock.tick(60)

Working with Images!

Images
Very easy to add images!
surface = pygame.Surface((100, 100))
Instantiate a blank surface by
calling the Surface constructor
What did we just do?

Images
Varying bitrate of image?
surface = pygame.Surface((100, 100), pygame.SRCALPHA)32-bit RGBA image
What did we just do?
This will create a 100 x 100 image
that's initialized to transparent.

Images
Custom Image?
How do we do that?
Let’s load this PNG image
image = pygame.image.load('ball.png')We need the file to be loaded
BALL.PNG
same as
ball.png
Linux
NOT SAME

Working with Sounds!

Sounds
Let’s start with the basics
Playing a song once
pygame.mixer.music.load('foo.mp3')
pygame.mixer.music.play(0)
Playing a song
infinitely
pygame.mixer.music.load('foo.mp3')
pygame.mixer.music.play(-1)
What does this do? pygame.mixer.music.play()

Sounds
More things to do with sounds!
Queuing a song pygame.mixer.music.queue('next_song.mp3')
Stopping a song pygame.mixer.music.stop()

Sounds
Simple code for sounds!
USEREVENT + 1 ensures
number assigned to
SONG_END isn’t equal to
any other event
...
SONG_END = pygame.USEREVENT + 1
pygame.mixer.music.set_endevent(SONG_END)
pygame.mixer.music.load('song.mp3')
pygame.mixer.music.play()
...
while True:
...
...
if event.type == SONG_END:
print("the song ended!")
...

Sounds
More operations with sound!
Consider 5 songs _songs = ['song_1.mp3', 'song_2.mp3', 'song_3.mp3', 'song_4.mp3', 'song_5.mp3']
Stopping a song
import random
def play_a_different_song():
global _currently_playing_song, _songs
next_song = random.choice(_songs)
while next_song == _currently_playing_
song:
next_song = random.choice(_songs)
_currently_playing_song = next_song
pygame.mixer.music.load(next_song)
pygame.mixer.music.play()
Add a flag _currently_playing_song = None

Sounds
More operations with sound!
Consider 5 songs _songs = ['song_1.mp3', 'song_2.mp3', 'song_3.mp3', 'song_4.mp3', 'song_5.mp3']
Play in same sequence
each time
def play_next_song():
global _songs
_songs = _songs[1:] + [_songs[0]] #
move current song to the back of list
pygame.mixer.music.load(_songs[0])
pygame.mixer.music.play(

Sounds
The music API is very centralized
.play() method effect = pygame.mixer.Sound('beep.wav')
effect.play()
_sound_library = {}
def play_sound(path):
global _sound_library
sound = _sound_library.get(path)
if sound == None:
canonicalized_path = path.replace('/', os.sep).replace('', os.sep)
sound = pygame.mixer.Sound(canonicalized_path)
_sound_library[path] = sound
sound.play()
Sound library

Geometric Drawing

Geometric Drawing
Drawing API is straightforward!
Rectangle pygame.draw.rect(surface, color, pygame.Rect(left, top, width, height))
Circle pygame.draw.circle(surface, color, (x, y), radius)

Geometric Drawing
Built-in Outlines
Fix those gaps?
# draw a rectangle
pygame.draw.rect(surface, color, pygame.Rect(10, 10, 100, 100), 10)
# draw a circle
pygame.draw.circle(surface, color, (300, 60), 50, 10)

Geometric Drawing
Acceptable Outlines Polygons Lines
pygame.draw.polygon(surface, color, point_list)

Geometric Drawing
Acceptable Outlines Polygons Lines
pygame.draw.line(surface, color, (startX, startY), (endX, endY), width)

Fonts & Text

Fonts & Texts
Quick answer to – How to render text?
import pygame
pygame.init()
screen = pygame.display.set_mode((640, 480))
clock = pygame.time.Clock()
done = False
font = pygame.font.SysFont("comicsansms", 72)
text = font.render("Hello, World", True, (0, 128, 0))
while not done:
if event.type == pygame.QUIT:
done = True
if event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE:
done = True
screen.fill((255, 255, 255))
screen.blit(text,
(320 - text.get_width() // 2, 240 - text.get_height() // 2))
pygame.display.flip()
clock.tick(60)

Fonts & Texts
Here are certain useful tips!
Enumerate fonts available on the system
all_fonts = pygame.font.get_fonts()
Enumerate default font of the system
font = pygame.font.Font(None, size)
Pass name of font file directly
font = pygame.font.Font("myresources/fonts/Papyrus.ttf", 26)

Fonts & Texts
Let’s optimize the creation process!
def make_font(fonts, size):
available = pygame.font.get_fonts()
# get_fonts() returns a list of lowercase spaceless font names
choices = map(lambda x:x.lower().replace(' ', ''), fonts)
for choice in choices:
if choice in available:
return pygame.font.SysFont(choice, size)
return pygame.font.Font(None, size)
_cached_text = {}
def create_text(text, fonts, size, color):
global _cached_text
key = '|'.join(map(str, (fonts, size, color, text)))
image = _cached_text.get(key, None)
if image == None:
font = get_font(fonts, size)
image = font.render(text, True, color)
_cached_text[key] = image
return image
_cached_fonts = {}
def get_font(font_preferences, size):
global _cached_fonts
key = str(font_preferences) + '|' + str(size)
font = _cached_fonts.get(key, None)
if font == None:
font = make_font(font_preferences, size)
_cached_fonts[key] = font
return font

PyGame Tutorial | PyGame Python Tutorial For Beginners | Python Certification Training | Edureka

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