"""
Show how to fire bullets.
Sample Python/Pygame Programs
Simpson College Computer Science
http://programarcadegames.com/
http://simpson.edu/computer-science/
Explanation video: http://youtu.be/PpdJjaiLX6A
"""
import pygame
import random
# Define some colors
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
BLUE = (0, 0, 255)
# --- Classes
class Block(pygame.sprite.Sprite):
""" This class represents the block. """
def __init__(self, color):
# Call the parent class (Sprite) constructor
super().__init__()
self.image = pygame.Surface([20, 15])
self.image.fill(color)
self.rect = self.image.get_rect()
class Player(pygame.sprite.Sprite):
""" This class represents the Player. """
def __init__(self):
""" Set up the player on creation. """
# Call the parent class (Sprite) constructor
super().__init__()
self.image = pygame.Surface([20, 20])
self.image.fill(RED)
self.rect = self.image.get_rect()
def update(self):
""" Update the player's position. """
# Get the current mouse position. This returns the position
# as a list of two numbers.
pos = pygame.mouse.get_pos()
# Set the player x position to the mouse x position
self.rect.x = pos[0]
class Bullet(pygame.sprite.Sprite):
""" This class represents the bullet . """
def __init__(self):
# Call the parent class (Sprite) constructor
super().__init__()
self.image = pygame.Surface([4, 10])
self.image.fill(BLACK)
self.rect = self.image.get_rect()
def update(self):
""" Move the bullet. """
self.rect.y -= 3
# --- Create the window
# Initialize Pygame
pygame.init()
# Set the height and width of the screen
screen_width = 700
screen_height = 400
screen = pygame.display.set_mode([screen_width, screen_height])
# --- Sprite lists
# This is a list of every sprite. All blocks and the player block as well.
all_sprites_list = pygame.sprite.Group()
# List of each block in the game
block_list = pygame.sprite.Group()
# List of each bullet
bullet_list = pygame.sprite.Group()
# --- Create the sprites
for i in range(50):
# This represents a block
block = Block(BLUE)
# Set a random location for the block
block.rect.x = random.randrange(screen_width)
block.rect.y = random.randrange(350)
# Add the block to the list of objects
block_list.add(block)
all_sprites_list.add(block)
# Create a red player block
player = Player()
all_sprites_list.add(player)
# Loop until the user clicks the close button.
done = False
# Used to manage how fast the screen updates
clock = pygame.time.Clock()
score = 0
player.rect.y = 370
# -------- Main Program Loop -----------
while not done:
# --- Event Processing
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
elif event.type == pygame.MOUSEBUTTONDOWN:
# Fire a bullet if the user clicks the mouse button
bullet = Bullet()
# Set the bullet so it is where the player is
bullet.rect.x = player.rect.x
bullet.rect.y = player.rect.y
# Add the bullet to the lists
all_sprites_list.add(bullet)
bullet_list.add(bullet)
# --- Game logic
# Call the update() method on all the sprites
all_sprites_list.update()
# Calculate mechanics for each bullet
for bullet in bullet_list:
# See if it hit a block
block_hit_list = pygame.sprite.spritecollide(bullet, block_list, True)
# For each block hit, remove the bullet and add to the score
for block in block_hit_list:
bullet_list.remove(bullet)
all_sprites_list.remove(bullet)
score += 1
print(score)
# Remove the bullet if it flies up off the screen
if bullet.rect.y < -10:
bullet_list.remove(bullet)
all_sprites_list.remove(bullet)
# --- Draw a frame
# Clear the screen
screen.fill(WHITE)
# Draw all the spites
all_sprites_list.draw(screen)
# Go ahead and update the screen with what we've drawn.
pygame.display.flip()
# --- Limit to 20 frames per second
clock.tick(60)
pygame.quit()