Question

好的，所以我的代码在下面，现在我是pygame的新手并试图弄清楚如何在屏幕上移动图像。从我所看到的pygame，下面的代码应该向上移动图像（现在唯一可能的移动）。但是，当我向上推动图像不动。 Python正在认识到我正在推高，因为它在系统托盘中打印，但是没有动作，有人可以帮忙吗？

import pygame, sys
from pygame.locals import *

FPS = 30


WIN_WIDTH = 800
WIN_HEIGHT = 600
HALF_WIDTH = int(WIN_WIDTH / 2)
HALF_HEIGHT = int(WIN_HEIGHT / 2)

COLOR = (255, 0, 255)
IMAGE = pygame.image.load('squirrel.png')
STARTSIZE = 25

LEFT = 'left'

def main():
    pygame.init()
    FPS_CLOCK = pygame.time.Clock()
    movement = 1

    moveUp = False

    DISPLAY_SURFACE = pygame.display.set_mode((WIN_WIDTH, WIN_HEIGHT))

    while True:
        DISPLAY_SURFACE.fill(COLOR)

        playerObj = {'surface': pygame.transform.scale(IMAGE, (STARTSIZE, STARTSIZE)),
                     'facing': LEFT,
                     'size': STARTSIZE,
                     'x': HALF_WIDTH,
                     'y': HALF_HEIGHT}

        playerObj['rect'] = pygame.Rect( (playerObj['x'], playerObj['y'], playerObj['size'], playerObj['size']) )
        DISPLAY_SURFACE.blit(playerObj['surface'], playerObj['rect'])


        for event in pygame.event.get():

            if event.type == KEYDOWN:
                if event.key == K_UP:
                    moveUp = True

            if event.type == KEYUP:
                if event.key == K_UP:
                    moveUp = False

            elif event.type == QUIT:
                pygame.quit()
                sys.exit()

        if moveUp:
            playerObj['y'] += movement
            print("moving up")

        else:
            print('stopped')

        pygame.display.update()
        FPS_CLOCK.tick(FPS)

if __name__ == '__main__':
    main()

Answer 1

每次迭代while循环时你都会创建一个新的playerObj，所以你不会看到它移动（因为它每次都将它的'y'值设置为HALF_HEIGHT）。将playerObj定义移出while循环。

Answer 2

您必须在进入while循环之前创建playerObj，然后每次只将其绘制到DISPLAY_SURFACE。此外，增加词典的键y无济于事，您必须修改rect。微创解决方案将是：

import pygame, sys
from pygame.locals import *

FPS = 30


WIN_WIDTH = 800
WIN_HEIGHT = 600
HALF_WIDTH = int(WIN_WIDTH / 2)
HALF_HEIGHT = int(WIN_HEIGHT / 2)

COLOR = (255, 0, 255)
IMAGE = pygame.image.load('squirrel.png')
STARTSIZE = 25

LEFT = 'left'

def main():
    pygame.init()
    FPS_CLOCK = pygame.time.Clock()
    movement = 1

    moveUp = False

    DISPLAY_SURFACE = pygame.display.set_mode((WIN_WIDTH, WIN_HEIGHT))

    playerObj = {'surface': pygame.transform.scale(IMAGE, (STARTSIZE, STARTSIZE)),
                     'facing': LEFT,
                     'size': STARTSIZE,
                     'x': HALF_WIDTH,
                     'y': HALF_HEIGHT}

    playerObj['rect'] = pygame.Rect( (playerObj['x'], playerObj['y'], playerObj['size'], playerObj['size']) )

    while True:
        DISPLAY_SURFACE.fill(COLOR)
        DISPLAY_SURFACE.blit(playerObj['surface'], playerObj['rect'])
        for event in pygame.event.get():

            if event.type == KEYDOWN:
                if event.key == K_UP:
                    moveUp = True

            if event.type == KEYUP:
                if event.key == K_UP:
                    moveUp = False

            elif event.type == QUIT:
                pygame.quit()
                sys.exit()

        if moveUp:
            playerObj['rect'].y -= movement
            print("moving up")

        else:
            print('stopped')

        pygame.display.update()
        FPS_CLOCK.tick(FPS)

if __name__ == '__main__':
    main()

它有效，我自己尝试过。但是你可以重构代码，不需要在字典中携带初始的x，y等值。

修改随着四个方向的移动，这将是：

import pygame, sys from pygame.locals import * FPS = 30 WIN_WIDTH = 800 WIN_HEIGHT = 600 HALF_WIDTH = int(WIN_WIDTH / 2) HALF_HEIGHT = int(WIN_HEIGHT / 2) COLOR = (255, 0, 255) IMAGE = pygame.image.load('squirrel.png') STARTSIZE = 25 LEFT = 'left' def move_rect(rect, key, distance): if key == K_UP: rect.y-=distance elif key == K_DOWN: rect.y+=distance elif key == K_LEFT: rect.x-=distance elif key == K_RIGHT: rect.x+=distance def main(): pygame.init() FPS_CLOCK = pygame.time.Clock() movement = 1 key2mvmt = {K_UP:False, K_DOWN:False, K_LEFT:False, K_RIGHT:False} DISPLAY_SURFACE = pygame.display.set_mode((WIN_WIDTH, WIN_HEIGHT)) playerObj = {'surface': pygame.transform.scale(IMAGE, (STARTSIZE, STARTSIZE)), 'facing': LEFT, 'size': STARTSIZE, 'x': HALF_WIDTH, 'y': HALF_HEIGHT} playerObj['rect'] = pygame.Rect( (playerObj['x'], playerObj['y'], playerObj['size'], playerObj['size']) ) while True: DISPLAY_SURFACE.fill(COLOR) DISPLAY_SURFACE.blit(playerObj['surface'], playerObj['rect']) for event in pygame.event.get(): if event.type == KEYDOWN: if key2mvmt.has_key(event.key): key2mvmt[event.key]= True if event.type == KEYUP: if key2mvmt.has_key(event.key): key2mvmt[event.key]= False elif event.type == QUIT: pygame.quit() sys.exit() for k in key2mvmt.keys(): if key2mvmt[k]: move_rect(playerObj['rect'], k, movement) else: print('stopped') pygame.display.update() FPS_CLOCK.tick(FPS) if __name__ == '__main__': main()

python和pygame图像运动

2 个答案: