Issue
This Content is from Stack Overflow. Question asked by Wizler
I am coding a basic snake game using python and wish to increase the snake’s speed every time a piece of food is eaten.
I attempted to add snake_speed + 5 whenever the food is eaten by adding it to the if statement affecting the length of the snake.
import pygame
import time
import random
pygame.init()
#colors
white = (255, 255, 255)
yellow = (255, 255, 102)
black = (0, 0, 0)
red = (213, 50, 80)
green = (0, 255, 0)
blue = (50, 153, 213)
orange = (218,103,60)
pink = (255, 105, 180)
#window geometry
dis_width = 700
dis_height = 600
#window
dis = pygame.display.set_mode((dis_width, dis_height))
#title
pygame.display.set_caption('Wizzys Pill Bottle')
#clock variable
clock = pygame.time.Clock()
This is where snake_speed is defined.
#snake_stuff
snake_block = 10
snake_speed = 15
font_style = pygame.font.SysFont("bahnschrift", 25)
score_font = pygame.font.SysFont("comicsansms", 35)
def Your_score(score):
value = score_font.render("Adderall eaten: " + str(score), True, yellow)
dis.blit(value, [0, 0])
def our_snake(snake_block, snake_list):
for x in snake_list:
pygame.draw.rect(dis, black, [x[0], x[1], snake_block, snake_block])
def message(msg, color):
mesg = font_style.render(msg, True, color)
dis.blit(mesg, [dis_width / 6, dis_height / 3])
def gameLoop():
game_over = False
game_close = False
x1 = dis_width / 2
y1 = dis_height / 2
x1_change = 0
y1_change = 0
snake_List = []
Length_of_snake = 1
foodx = round(random.randrange(0, dis_width - snake_block) / 10.0) * 10.0
foody = round(random.randrange(0, dis_height - snake_block) / 10.0) * 10.0
while not game_over:
while game_close == True:
dis.fill(blue)
message("OVERDOSED. For stomach pump press C", red)
Your_score(Length_of_snake - 1)
pygame.display.update()
for event in pygame.event.get():
if event. Type == pygame.KEYDOWN:
if event. Key == pygame.K_q:
game_over = True
game_close = False
if event. Key == pygame.K_c:
gameLoop()
for event in pygame.event.get():
if event. Type == pygame.QUIT:
game_over = True
if event. Type == pygame.KEYDOWN:
if event. Key == pygame.K_LEFT:
x1_change = -snake_block
y1_change = 0
elif event. Key == pygame.K_RIGHT:
x1_change = snake_block
y1_change = 0
elif event. Key == pygame.K_UP:
y1_change = -snake_block
x1_change = 0
elif event. Key == pygame.K_DOWN:
y1_change = snake_block
x1_change = 0
if x1 >= dis_width or x1 < 0 or y1 >= dis_height or y1 < 0:
game_close = True
x1 += x1_change
y1 += y1_change
dis.fill(orange)
pygame.draw.rect(dis, pink, [foodx, foody, snake_block, snake_block])
snake_Head = []
snake_Head.append(x1)
snake_Head.append(y1)
snake_List.append(snake_Head)
if len(snake_List) > Length_of_snake:
del snake_List[0]
for x in snake_List[:-1]:
if x == snake_Head:
game_close = True
our_snake(snake_block, snake_List)
Your_score(Length_of_snake - 1)
pygame.display.update()
if x1 == foodx and y1 == foody:
foodx = round(random.randrange(0, dis_width - snake_block) / 10.0) * 10.0
foody = round(random.randrange(0, dis_height - snake_block) / 10.0) * 10.0
Length_of_snake += 1
snake_speed + 5
clock. Tick(snake_speed)
pygame.quit()
quit()
gameLoop()
After running the code, I am unable to see any change.
Solution
After fixed few typo and indentation errors as shown below, it runs!
Then to increase speed: snake_speed = snake_speed + 5
Also need to move the snake_speed variable inside the gameLoop() to avoid the "UnboundLocalError: local variable 'snake_speed' referenced before assignment" error
import pygame
import time
import random
pygame.init()
#colors
white = (255, 255, 255)
yellow = (255, 255, 102)
black = (0, 0, 0)
red = (213, 50, 80)
green = (0, 255, 0)
blue = (50, 153, 213)
orange = (218,103,60)
pink = (255, 105, 180)
#window geometry
dis_width = 700
dis_height = 600
#window
dis_width = 700
dis_height = 600
#window
dis = pygame.display.set_mode((dis_width, dis_height))
#title
pygame.display.set_caption('Wizzys Pill Bottle')
#clock variable
clock = pygame.time.Clock()
#snake_stuff
snake_block = 10
font_style = pygame.font.SysFont("bahnschrift", 25)
score_font = pygame.font.SysFont("comicsansms", 35)
def Your_score(score):
value = score_font.render("Adderall eaten: " + str(score), True, yellow)
dis.blit(value, [0, 0])
def our_snake(snake_block, snake_list):
for x in snake_list:
pygame.draw.rect(dis, black, [x[0], x[1], snake_block, snake_block])
def message(msg, color):
mesg = font_style.render(msg, True, color)
dis.blit(mesg, [dis_width / 6, dis_height / 3])
def gameLoop():
game_over = False
game_close = False
x1 = dis_width / 2
y1 = dis_height / 2
x1_change = 0
y1_change = 0
snake_List = []
Length_of_snake = 1
foodx = round(random.randrange(0, dis_width - snake_block) / 10.0) * 10.0
foody = round(random.randrange(0, dis_height - snake_block) / 10.0) * 10.0
snake_speed = 15 #move the variable inside the gameLoop
while not game_over:
while game_close == True:
dis.fill(blue)
message("OVERDOSED. For stomach pump press C", red)
Your_score(Length_of_snake - 1)
pygame.display.update()
for event in pygame.event.get():
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_q:
game_over = True
game_close = False
if event.key == pygame.K_c:
gameLoop()
for event in pygame.event.get():
if event.type == pygame.QUIT:
game_over = True
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
x1_change = -snake_block
y1_change = 0
elif event.key == pygame.K_RIGHT:
x1_change = snake_block
y1_change = 0
elif event.key == pygame.K_UP:
y1_change = -snake_block
x1_change = 0
elif event.key == pygame.K_DOWN:
y1_change = snake_block
x1_change = 0
if x1 >= dis_width or x1 < 0 or y1 >= dis_height or y1 < 0:
game_close = True
x1 += x1_change
y1 += y1_change
dis.fill(orange)
pygame.draw.rect(dis, pink, [foodx, foody, snake_block, snake_block])
snake_Head = []
snake_Head.append(x1)
snake_Head.append(y1)
snake_List.append(snake_Head)
if len(snake_List) > Length_of_snake:
del snake_List[0]
for x in snake_List[:-1]:
if x == snake_Head:
game_close = True
our_snake(snake_block, snake_List)
Your_score(Length_of_snake - 1)
pygame.display.update()
if x1 == foodx and y1 == foody:
foodx = round(random.randrange(0, dis_width - snake_block) / 10.0) * 10.0
foody = round(random.randrange(0, dis_height - snake_block) / 10.0) * 10.0
Length_of_snake += 1
snake_speed = snake_speed + 5 #fixed the assignment
clock.tick(snake_speed)
pygame.quit()
quit()
gameLoop()
This Question was asked in StackOverflow by Wizler and Answered by Paul Wang It is licensed under the terms of CC BY-SA 2.5. - CC BY-SA 3.0. - CC BY-SA 4.0.