In this tutorial we will be creating a classes for the player and mob cars
In the cars images I downloaded, I took and edited the images with gimp as the has space around them that was causing the mob cars to hit
the player car at a distance. I just used crop to shrink/remove the spaces.
I've hard coded the placements and boundries for the cars and mobs for the tutorial. There are other ways to
get placement and boundries.
I used pygame.sprite.Sprite functionality for detecting collisions
First the player class
Now the mob class
Our screen should look like this and the player car should be able to move to the left and right
using either the a and d keys or the left and right arrow keys.
In the cars images I downloaded, I took and edited the images with gimp as the has space around them that was causing the mob cars to hit
the player car at a distance. I just used crop to shrink/remove the spaces.
I've hard coded the placements and boundries for the cars and mobs for the tutorial. There are other ways to
get placement and boundries.
I used pygame.sprite.Sprite functionality for detecting collisions
First the player class
Python:
# Create a class for playe car
class Player(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
# Load image
self.image = pygame.image.load(f'{path}/media/images/cars/pixel_racecar_blue.png')
self.image = pygame.transform.scale(self.image, (30,40))
self.rect = self.image.get_rect()
self.rect.centerx = 645
self.rect.bottom = 700
self.speedx = 0
def update(self):
'''
Method for updating sprite movement
'''
# Set the speed
self.speedx = 0
# Get keys pressed
keystate = pygame.key.get_pressed()
# If the left arrow or a key is pressed, player moves left
if keystate[pygame.K_LEFT] or keystate[pygame.K_a]:
self.speedx = -5
# If the right arrow or d key is pressed, go right
if keystate[pygame.K_RIGHT] or keystate[pygame.K_d]:
self.speedx = 5
# sprite speed
self.rect.x += self.speedx
# Set boundries for movement. We don't want to go off road
if self.rect.left < 495:
self.rect.left = 495
if self.rect.right > 785:
self.rect.right = 785Now the mob class
Python:
class Mob(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
# Get a list of cars from the image directory
cars = os.listdir(f'{path}/media/images/cars')
# This can be commented out to use all cars.
# Using it to not have a mob with the same as a player car
mobcars = [car for car in cars if car != 'pixel_racecar_blue.png']
# Load a random image using choice from pyhton random module
self.image = pygame.image.load(f'{path}/media/images/cars/{choice(mobcars)}')
# Scale the image and rotate so the car is facing player
self.image = pygame.transform.scale(self.image, (30,40))
self.image = pygame.transform.rotate(self.image, 180)
# Get the rect for the image
self.rect = self.image.get_rect()
# Creating a random center for the mob so as to have them
# start at a random place instead of all at the same place
self.rect.centerx = randint(510, 770)
# They will start off the screen view
self.rect.bottom = -50
# Set a random speed
self.speedy = randint(6,9)
def update(self):
# Method updates mob movement
# Give and update the speed
self.rect.y += self.speedy
Now the car.py should be looking something like this.
[B]Note:[/B] I have created and added a player, player sprite group, and added the player to the sprite group
[CODE=python]
# Do the imports
import pygame
import os
from random import randint, randrange, choice
'''
Get the path of the working directory
Should get the correct path in console or editor
We will use this to access directories containing
images and sound
'''
path = os.path.realpath(os.path.dirname(__file__))
'''
Initiate pygame to acces all classes and functions
'''
pygame.init()
'''
Setup the pygame time clock.
We will use this to set the framerate
'''
clock = pygame.time.Clock()
# Set the framerate
fps = 60
'''
Setup our screen window. A tuple is needed for setting width and height
I'm going to use a 1280 width and 720 height
'''
screen_size = (1280, 720)
screen = pygame.display.set_mode(screen_size)
# Set the caption for the window
pygame.display.set_caption('Dodge Car')
# define a function to draw the yellow lines
def line(surf, x):
line = pygame.Surface((2, 720))
line.fill('yellow')
surf.blit(line, (x, 0))
# Define a function to draw the dotted white line
def line2(surf, x):
line = pygame.Surface((2, 20))
line.fill('white')
for i in range(720):
if i % 10 == 0:
surf.blit(line,(x, i*10))
# Define a function to draw the road
def road(screen):
surf = pygame.Surface((300, 720))
surf.fill('black')
screen.blit(surf, (490,0))
# Create a class for playe car
class Player(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
# Load image
self.image = pygame.image.load(f'{path}/media/images/cars/pixel_racecar_blue.png')
self.image = pygame.transform.scale(self.image, (30,40))
self.rect = self.image.get_rect()
self.rect.centerx = 645
self.rect.bottom = 700
self.speedx = 0
def update(self):
'''
Method for updating sprite movement
'''
# Set the speed
self.speedx = 0
# Get keys pressed
keystate = pygame.key.get_pressed()
# If the left arrow or a key is pressed, player moves left
if keystate[pygame.K_LEFT] or keystate[pygame.K_a]:
self.speedx = -5
# If the right arrow or d key is pressed, go right
if keystate[pygame.K_RIGHT] or keystate[pygame.K_d]:
self.speedx = 5
# sprite speed
self.rect.x += self.speedx
# Set boundries for movement. We don't want to go off road
if self.rect.left < 495:
self.rect.left = 495
if self.rect.right > 785:
self.rect.right = 785
class Mob(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
# Get a list of cars from the image directory
cars = os.listdir(f'{path}/media/images/cars')
# This can be commented out to use all cars.
# Using it to not have a mob with the same as a player car
mobcars = [car for car in cars if car != 'pixel_racecar_blue.png']
# Load a random image using choice from pyhton random module
self.image = pygame.image.load(f'{path}/media/images/cars/{choice(mobcars)}')
# Scale the image and rotate so the car is facing player
self.image = pygame.transform.scale(self.image, (30,40))
self.image = pygame.transform.rotate(self.image, 180)
# Get the rect for the image
self.rect = self.image.get_rect()
# Creating a random center for the mob so as to have them
# start at a random place instead of all at the same place
self.rect.centerx = randint(510, 770)
# They will start off the screen view
self.rect.bottom = -50
# Set a random speed
self.speedy = randint(7,10)
def update(self):
# Method updates mob movement
# Give and update the speed
self.rect.y += self.speedy
# Create the player, player sprite group and add player to sprite group
player = Player()
player_sprite = pygame.sprite.Group()
player_sprite.add(player)
# Create a mob, mob sprite group, and add mob to sprite_group
mob_sprite = pygame.sprite.Group()
for i in range(randrange(3, 4)):
mob = Mob()
mob.rect.centerx = randint(510, 770)
mob_sprite.add(mob)
# Set a loop variable
running = True
# Start the game loop
while running:
# Set background color
screen.fill('seagreen')
'''
Get pygame events. There is 2 ways to do this.
We can use pygame.event.poll() - return one event or
we can use a loop and get all events. We will use the latter -
pygame.event.get()
'''
# Get keys that are pressed
key = pygame.key.get_pressed()
for event in pygame.event.get():
# A way to exit pygame
if event.type == pygame.QUIT:
running = False
# Can press the esc key and exit the game
if key[pygame.K_ESCAPE]:
running = False
# Blit the road
road(screen)
line(screen, 493)
line(screen, 785)
line2(screen, 640)
# Update and draw sprites
player_sprite.update()
player_sprite.draw(screen)
mob_sprite.update()
mob_sprite.draw(screen)
# Update the screen
pygame.display.update()
# Set our framerate
clock.tick(fps)
pygame.quit()Our screen should look like this and the player car should be able to move to the left and right
using either the a and d keys or the left and right arrow keys.
