Pygame-按退格鍵更改精靈顏色

Question

我正在嘗試制作游戲，並且希望使用戶能夠在按Backspace鍵時更改其精靈的顏色。 截至目前，我沒有畫任何東西在屏幕上，我也不知道為什么。 歡迎提供任何詳細的答案，說明如何以及為何更改精靈的顏色：這是我的代碼：

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()

Answer 1

首先，以適當的順序放置渲染函數，並將其放入while循環中：

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

然后，正確定義pygame.Rect對象

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

這可能是您嘗試查找的內容（有一些修復）：

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()