Pygame - Pressing backspace to change sprite color

I'm trying to make a game, and I want to make the user be able to change color of their sprite when pressing backspace. As of now, nothing that I draw appears on screen, I have no idea why. Any detailed answer, explaining how and why you change the color of your sprite would be welcome:
This is my code:

import pygame

pygame.init()

white = (255, 255, 255)
black = (0, 0, 0)
red = (255, 0, 0)
width = 800
height = 600
FPS = 100
font = pygame.font.SysFont(None, 25)

gameDisplay = pygame.display.set_mode((width, height))
pygame.display.set_caption("Second snake game.")
clock = pygame.time.Clock()

def message_to_screen(msg, color):
screen_text = font.render(msg, True, color)
gameDisplay.blit(screen_text, [width/2, height/2])

def gameloop():
exitGame = False
lead_x = width/2
lead_y = height/2
lead_x_change = 0
lead_y_change = 0
block_size = 10
velocity = 0.1
rectangle = pygame.draw.rect(gameDisplay, black, [lead_x, lead_y, block_size, block_size])

while not exitGame:
for event in pygame.event.get():
if event.type == pygame.QUIT:
exitGame = True
pygame.quit()
quit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_w:
lead_y_change += -velocity
lead_x_change = 0
if event.key == pygame.K_s:
lead_y_change += velocity
lead_x_change = 0
if event.key == pygame.K_a:
lead_x_change += -velocity
lead_y_change = 0
if event.key == pygame.K_d:
lead_x_change += velocity
lead_y_change = 0
if event.key == pygame.K_BACKSPACE:
rectangle.rect(gameDisplay, black, [lead_x, lead_y, block_size, block_size])
if event.type == pygame.KEYUP:
if event.key == pygame.K_a or event.key == pygame.K_d:
lead_x_change = 0
if event.key == pygame.K_w or event.key == pygame.K_s:
lead_y_change = 0


lead_x += lead_x_change
lead_y += lead_y_change
gameDisplay.fill(white)
pygame.display.update()
clock.tick(FPS)
gameloop()


1 Answer
1

First, put the rendering functions in an appropriate order and put them in your while loop:

gameDisplay.fill(white) # Display fill comes first
pygame.draw.rect(gameDisplay, black, rectangle) # Then draw your objects
pygame.display.flip() # Update the screen


Then, define the pygame.Rect object properly

rectangle = pygame.Rect(lead_x, lead_y, block_size, block_size)


This is what you are probably trying to find (with my few fixes):

import pygame
pygame.init()

# Constants
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
RED = (255, 0, 0)
WIDTH = 800
HEIGHT = 600
FPS = 100
FONT = pygame.font.SysFont(None, 25)
BLOCK_SIZE = 10
VELOCITY = 10

gameDisplay = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Second snake game.")
clock = pygame.time.Clock()

def message_to_screen(msg, color):
screen_text = font.render(msg, True, color)
gameDisplay.blit(screen_text, [width/2, height/2])

def gameloop():
exitGame = False
x = WIDTH / 2
y = HEIGHT / 2
rectangle = pygame.Rect(x, y, BLOCK_SIZE, BLOCK_SIZE)
rectangle_color = BLACK

while not exitGame:
clock.tick(FPS)

# Pygame events
for event in pygame.event.get():
if event.type == pygame.QUIT:
exitGame = True
pygame.quit()
quit()

if event.type == pygame.KEYUP:
if event.key == pygame.K_w:
y -= VELOCITY
if event.key == pygame.K_s:
y += VELOCITY
if event.key == pygame.K_a:
x -= VELOCITY
if event.key == pygame.K_d:
x += VELOCITY
if event.key == pygame.K_BACKSPACE:
rectangle_color = RED if rectangle_color == BLACK else BLACK

# Update rect coords
rectangle = pygame.Rect(x, y, BLOCK_SIZE, BLOCK_SIZE)

# Render everything
gameDisplay.fill(WHITE)
pygame.draw.rect(gameDisplay, rectangle_color, rectangle)
pygame.display.flip()

gameloop()


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