Pygame Help Trying to add apples in Snakegame

Question

import pygame
import random
import time

pygame.init()

display_width = 800
display_height = 600

gameDisplay = pygame.display.set_mode((display_width, display_height))
pygame.display.set_caption('slither')

white = (255, 255, 255)
black = (0,0,0)
red = (252,25,25)
blue = (20,20,250)
purple = (90,33,146)



movement_size = 10
block_size = 20

clock = pygame.time.Clock()

font = pygame.font.SysFont(None, 25)
def message_to_screen(msg,colour):
screen_text = font.render(msg, True, colour)
gameDisplay.blit(screen_text, [display_width/2, display_height/2])

def gameLoop():
    gameExit = False
    gameOver = False

lead_x = display_width/2.0
lead_y = display_height/2.0

lead_x_change = 0
lead_y_change = 0

randAppleX = random.randrange(0, display_width-block_size)
randAppleY = random.randrange(display_height-block_size, 0)

while not gameExit:

    while gameOver == True:
        gameDisplay.fill(purple)
        message_to_screen("Game Over, Press 'C' to play again or 'Q' to Quit", red)
        pygame.display.update()

        for event in pygame.event.get():
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_q:
                    gameExit = True
                    gameOver = False
                if event.key == pygame.K_c:
                    gameLoop()

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            gameExit = True
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                lead_x_change -= movement_size
                lead_y_change = 0
            elif event.key == pygame.K_RIGHT:
                lead_x_change += movement_size
                lead_y_change= 0

            elif event.key == pygame.K_UP:
                lead_y_change -= movement_size
                lead_x_change= 0
            elif event.key == pygame.K_DOWN:
                lead_y_change += movement_size
                lead_x_change= 0

            if lead_x >= 782 or lead_x < 0 or lead_y >= 582 or lead_y < 0:
                gameOver = True

    lead_x += lead_x_change
    lead_y += lead_y_change
    gameDisplay.fill(white)
    pygame.draw.rect(gameDisplay, red, [randAppleX, randAppleY, block_size, block_size])
    pygame.draw.rect(gameDisplay, black, [lead_x, lead_y, block_size, block_size])
    pygame.display.update()

    clock.tick(11)


pygame.quit()
quit()


gameLoop()

I was trying to add 'apples' in my snake game. However I was troubled in doing so. Any help debugging code would be very much appreciated! I'm getting some error on lines; 94,42 and 218 something has gone horribly wrong with the randrange stuff.

http://i63.tinypic.com/1h4ggj.png <----- To See

shanmuga · Accepted Answer

the error happens in

randAppleY = random.randrange(display_height-block_size, 0)

As the error stack trace indicates that randrange function got parameters start=580, stop=0. From inspecting the source file for this function shows that the default value for step is 1.
This is causing the problem as 0 is less than 580 and connot be reached by adding 1 (step parameter) any number of times.

What you can do to fix this is either pass step parameter as -1

randAppleY = random.randrange(display_height-block_size, 0, -1)

Or pass the smaller value as start and larger value as stop parameter

randAppleY = random.randrange(0, display_height-block_size)

Pygame Help Trying to add apples in Snakegame

Answers (2)

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