vampirepizza_chapter9.py

#Set-up Game

#import libraries
import pygame
from pygame import *
from random import randint

#initialize pygame
pygame.init()

#set up clock
clock = time.Clock() 

#-----------------------------
#Define constant variables

#Define the parameters of the game window
WINDOW_WIDTH = 1100
WINDOW_HEIGHT = 600
WINDOW_RES = (WINDOW_WIDTH, WINDOW_HEIGHT)

# Define the parameters of each tile
WIDTH = 100
HEIGHT = 100

# Define some colors
WHITE = (255, 255, 255)

#Set up rates
SPAWNRATE = 360
FRAMERATE = 60

#Define speeds
REG_SPEED = 2
SLOW_SPEED = 1

#--------------------------------------------------------------
#Load Assets 


#create window
GAME_WINDOW = display.set_mode(WINDOW_RES)
display.set_caption('Vampire Pizza')

#set up enemy imgage
pizza_img = image.load('vampire.png')
pizza_surf = Surface.convert(pizza_img)
VAMPIRE_PIZZA = transform.scale(pizza_surf, (100, 100))

#set up background image
background_img = image.load('restaurant.jpg')
background_surf = Surface.convert(background_img)
BACKGROUND = transform.scale(background_surf, (WINDOW_RES))


#---------------------------------------------
#Set up classes

#Create an enemy class
class VampireSprite(sprite.Sprite):

    #This function creates an instance of the enemy
    def __init__(self):
        super().__init__()
        self.speed = REG_SPEED
        self.lane = randint(0, 4)
        all_vampires.add(self)
        self.image = VAMPIRE_PIZZA.copy()
        y = 50 + self.lane * 100
        self.rect = self.image.get_rect(center=(1100, y))

    #This function moves the enemies from right to left and destroys them after they've left the screen
    def update(self, game_window):
        game_window.blit(BACKGROUND, (self.rect.x, self.rect.y), self.rect)
        self.rect.x -= self.speed
        game_window.blit(self.image, (self.rect.x, self.rect.y))



#Create a class of sprites. Each tile has an invisible interactive field attached to it which is a sprite in this class. 
class BackgroundTile(sprite.Sprite):

    def __init__(self):
        super().__init__()
        self.effect = False




#-------------------------------------------------------------
#Create class instances

#create a sprite group for all the VampireSprite instances
all_vampires = sprite.Group()


#--------------------------------------------------------------
# Initialize and draw Background Grid

# Create an empty list to hold the tile grid
tile_grid = []
# Populate the grid
tile_color = WHITE
for row in range(6):
    row_of_tiles = []
    tile_grid.append(row_of_tiles)
    for column in range(11):
        new_tile = BackgroundTile()
        new_tile.rect = pygame.Rect(WIDTH * column, HEIGHT * row, WIDTH, HEIGHT)
        row_of_tiles.append(new_tile) 
        draw.rect(BACKGROUND, tile_color, (WIDTH * column, HEIGHT * row, WIDTH, HEIGHT), 1)

GAME_WINDOW.blit(BACKGROUND, (0,0))




#--------------------------------------------------------------------------------------------------------------------------------------
#Start Main Game Loop

#Game Loop
running = True
while running: 

#------------------------------------------
#Check for events

    #checking for and handling events
    for event in pygame.event.get():

        #exit loop on quit
        if event.type == QUIT: 
            running = False

        #Set up the background tiles to respond to a mouse click
        elif event.type == pygame.MOUSEBUTTONDOWN:
            x, y = pygame.mouse.get_pos()
            tile_grid[y // 100][x //100].effect = True


#-------------------------------------------------
#Create VampireSprite instances

    if randint(1, SPAWNRATE) == 1:
        VampireSprite()

#------------------------------------------------
#Set up collision detection

    #draw the background grid
    for tile_row in tile_grid:
        for tile in tile_row:
            GAME_WINDOW.blit(BACKGROUND, (tile.rect.x, tile.rect.y), tile.rect)

    #set up collision detection
    for vampire in all_vampires:
        tile_row = tile_grid[vampire.rect.y // 100]
        vampire_left_side_x = vampire.rect.x // 100
        vampire_right_side_x = (vampire.rect.x + vampire.rect.width) // 100
        if -1 < vampire_left_side_x < 10:
            left_tile = tile_row[vampire_left_side_x]
        else:
            left_tile = None
        if -1 < vampire_right_side_x < 10:
            right_tile_wall = tile_row[vampire_right_side_x]
        else:
            right_tile = None
        if bool(left_tile) and left_tile.effect:
            vampire.speed = SLOW_SPEED
        if bool(right_tile) and right_tile.x != left_tile.x and right_tile.effect:
            vampire.speed = SLOW_SPEED
        if vampire.rect.x <= 0:
            vampire.kill()


#-------------------------------------------------
#Update displays
    for vampire in all_vampires:
        vampire.update(GAME_WINDOW)

    display.update()

    #set the framerate
    clock.tick(FRAMERATE)

#Close Main Game Loop
#------------------------------------------------------------------------------------------------------------------------
#End of game loop

#Clean-up Game
pygame.quit()