Pygame 仅显示一个图像/精灵

Question

# Import the library PyGame
import pygame; pygame.init()

# Create the window/GUI
global window
window = pygame.display.set_mode((800, 800))
pygame.display.set_caption('Space Invaders')


class sprite:
    """A class that you assign to the a sprite, it has the functions     draw() and resize()"""

    def __init__(self, fileto):
        self.x = 330
        self.y = 700
        self.width = 100
        self.height = 100
        self.image = pygame.image.load(fileto).convert()

    # Blit the sprite onto the screen, ex: plane.draw()
    def draw(self):
        window.fill(255)
        window.blit(self.image, (self.x, self.y))
        self.image = pygame.transform.scale(self.image, (self.width, self.height))
        pygame.display.flip()


bakgrunn = pygame.image.load("stars.png").convert()

# Assign the variable plane to the class "sprite"
plane = sprite("plane.gif")
projectile = sprite("projectile.png")

while True:
    # Draw the plane and set the size
    plane.draw()
    plane.width = 100
    plane.height = 100

    projectile.draw()

我正在 PyGame 中制作 Space Invaders 游戏，但是当我尝试绘制射弹时，它会覆盖/更改主精灵（平面）。我该如何解决这个问题，以便我可以在屏幕上显示多个精灵？

Answer 1

你的精灵的绘图功能给你带来了问题。每次绘制精灵时，它都会填充并刷新显示。这意味着如果您有两个或更多对象，则只会显示最后一个。仅对每个对象使用 blit 函数，并在每个游戏循环中仅填充/刷新屏幕一次。

# Import the library PyGame
import pygame; pygame.init()

# Create the window/GUI
window = pygame.display.set_mode((800, 800))
pygame.display.set_caption('Space Invaders')


class Sprite:
    """A class that you assign to the a sprite, it has the functions     draw() and resize()"""

    def __init__(self, fileto):
        self.x = 330
        self.y = 700
        self.width = 100
        self.height = 100
        self.image = pygame.image.load(fileto).convert()

    # Blit the sprite onto the screen, ex: plane.draw()
    def draw(self):
        window.blit(self.image, (self.x, self.y))    

# Assign the variable plane to the class "sprite"
plane = Sprite("plane.gif")
projectile = Sprite("projectile.png")

while True:
    # Clear the screen.
    window.fill((255, 255, 255))

    # Draw all objects to the screen.
    plane.draw()
    projectile.draw()

    # Make all everything you've drawn appear on your display.
    pygame.display.update()  # pygame.display.flip() works too

这将正确绘制所有精灵。但是，它会在几秒钟后崩溃，因为您没有处理事件。您需要先查阅相关教程，然后才能进一步前进。