如何将背景图像添加到pygame？

Question

pygame的新手只想知道如何在游戏中添加背景图片？这是我的代码到目前为止,我一直使用bg作为导入我的图像的方法,但py文件本身拒绝加载.

import pygame
import sys
from pygame.locals import *

clock = pygame.time.Clock()
screen = pygame.display.set_mode((600,500))

bg = pygame.image.load("images\space.png")


pygame.mouse.set_visible(0)

ship = pygame.image.load("images\ship.png")
ship_top = screen.get_height() - ship.get_height()
ship_left = screen.get_width()/2 - ship.get_width()/2

screen.blit(ship, (ship_left,ship_top))

shot = pygame.image.load("images\shot.png")
shoot_y = 0


pygame.display.set_caption('galaxy invaders')

while True:
    clock.tick(60)
    screen.fill((r,0,0))
    screen.blit(bg.(0,0))
    x,y = pygame.mouse.get_pos()
    screen.blit(ship, (x-ship.get_width()/2, ship_top))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == MOUSEBUTTONDOWN:
            shoot_y = 500
            shoot_x = x

    if shoot_y > 0:
        screen.blit(shot, (shoot_x, shoot_y))
        shoot_y -= 10

    pygame.display.update()

Answer 1

这个问题很容易解决.您需要一个与屏幕大小相符的图像作为背景.请记住pygame.init()在游戏开始时添加,以便能够启动它和它的能力.这张图片的功能可以像这样使用:

class Background(pygame.sprite.Sprite):
    def __init__(self, image_file, location):
        pygame.sprite.Sprite.__init__(self)  #call Sprite initializer
        self.image = pygame.image.load(image_file)
        self.rect = self.image.get_rect()
        self.rect.left, self.rect.top = location

这将允许程序在您调用它时通过此函数加载图像:

BackGround = Background('background_image.png', [0,0])

你还需要while循环中的这两行:

screen.fill([255, 255, 255])
screen.blit(BackGround.image, BackGround.rect)

这将使您的屏幕填满白色并将背景图像放在它上面,但在其他精灵和物体下面.
建议: 你应该为你的另一个精灵创建另一个类(可能是图像没有出现的原因).一个例子可能是:

class Ship(pygame.sprite.Sprite):
    def __init__(self, image_file, speed, location):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.image.load(image_file)
        self.rect = self.image.get_rect()
        self.rect.left, self.rect.top = location

然后你可以像这样"激活"它:

ship = Ship("images\ship.png", [a, b])

选择的坐标a和b.然后你可以像这样将图像blit到屏幕上但是在你的后台blit声明之后:

screen.blit(ship.image, ship.rect)

我希望这可以帮助你!

Answer 2

对于背景我总是将图像设置为我的游戏窗口的大小或更小,然后在显示所有图像之前,我将该图像blit为0,0.

bg = pygame.image.load("bg.png")

#INSIDE OF THE GAME LOOP
gameDisplay.blit(bg, (0, 0))

#REST OF ITEMS ARE BLIT'D TO SCREEN.

希望这可以帮助.

Answer 3

首先，这一切都不起作用，因为你在导入 Pygame 后没有初始化它。此外，图片不会被加载，因为反斜杠表示转义序列。最后，你应该修复你的缩进。

import pygame
import sys
from pygame.locals import *

pygame.init() # initialize pygame
clock = pygame.time.Clock()
screen = pygame.display.set_mode((600,500))

# os.path.join properly forms a cross-platform relative path
# by joining directory names

bg = pygame.image.load(os.path.join("images", "space.png"))


pygame.mouse.set_visible(0)

ship = pygame.image.load(os.path.join("images", "ship.png"))
ship_top = screen.get_height() - ship.get_height()
ship_left = screen.get_width()/2 - ship.get_width()/2
screen.blit(ship, (ship_left,ship_top))

shot = pygame.image.load(os.path.join("images", "space.png"))
shoot_y = 0


pygame.display.set_caption('galaxy invaders')

# fix indentation

while True:
    clock.tick(60)
    screen.blit(bg, (0,0))
    x,y = pygame.mouse.get_pos()
    screen.blit(ship, (x-ship.get_width()/2, ship_top))

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == MOUSEBUTTONDOWN:
            shoot_y = 500
            shoot_x = x

    if shoot_y > 0:
        screen.blit(shot, (shoot_x, shoot_y))
        shoot_y -= 10

    pygame.display.update()