Pygame中的平滑键盘移动 [英] Smooth Keyboard Movement in Pygame

问题描述

我正在使用此代码在按下箭头键时让玩家精灵在屏幕上移动：

I'm using this code to have a player sprite move around a screen when the arrow keys are pressed:

import pygame, sys, time
from pygame.locals import *

pygame.init()

FPS=30
fpsClock=pygame.time.Clock()

width=400
height=300
DISPLAYSURF=pygame.display.set_mode((width,height),0,32)
pygame.display.set_caption('Animation')
background=pygame.image.load('bg.png')


UP='up'
LEFT='left'
RIGHT='right'
DOWN='down'

sprite=pygame.image.load('down.png')
spritex=200
spritey=130
direction=DOWN


pygame.mixer.music.load('bgm.mp3')
pygame.mixer.music.play(-1, 0.0)
while True:
    DISPLAYSURF.blit(background,(0,0))

    DISPLAYSURF.blit(sprite,(spritex,spritey))

    for event in pygame.event.get():
        if event.type==QUIT:
            pygame.quit()
            sys.exit()

        if event.type == KEYDOWN:
            if (event.key == K_LEFT):
                spritex-=5
                sprite=pygame.image.load('left.png')
            elif (event.key == K_RIGHT):
                spritex+=5
                sprite=pygame.image.load('right.png')
            elif (event.key == K_UP):
                spritey-=5
                sprite=pygame.image.load('up.png')
            elif (event.key == K_DOWN):
                spritey+=5
                sprite=pygame.image.load('down.png')

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

图像可以实际移动，但是按下键时只有5个像素。我希望图像在按住键的同时保持移动（并添加与窗口的基本碰撞检测，但这是另一个问题）。

The image is able to actually move, but only 5 pixels when the key is pressed. I want for the image to keep moving while the key is held down (and to add basic collision detection with the window, but that's a different issue). What would make the image keep moving while the key is pressed down?

推荐答案

我建议使用变量来跟踪哪个箭头键？被按下而没有被按下。您可以使用 KEYDOWN 和 KEYUP 事件来更新变量。然后，您可以根据按下的键来调整每帧精灵的位置。这也意味着您可以通过更改每帧移动精灵的距离来轻松设置精灵在不同方向上的速度。

I suggest using variables to keep track of which arrow keys are pressed and which are not. You can use the KEYDOWN and KEYUP events to update the variables. Then you can adjust the position of the sprite each frame based on which keys are pressed. This also means you can easily set the speed of the sprite in different directions by changing how far it moves each frame.

编辑：

或者按照@monkey的建议，您可以使用 key.get_pressed（）。

Or as @monkey suggested, you can use key.get_pressed() instead.

这是未经测试的示例：

while True:
    DISPLAYSURF.blit(background,(0,0))

    DISPLAYSURF.blit(sprite,(spritex,spritey))

    for event in pygame.event.get():
        if event.type==QUIT:
            pygame.quit()
            sys.exit()

        if event.type == KEYDOWN:
            if (event.key == pygame.K_LEFT):
                sprite=pygame.image.load('left.png')
            elif (event.key == pygame.K_RIGHT):
                sprite=pygame.image.load('right.png')
            elif (event.key == pygame.K_UP):
                sprite=pygame.image.load('up.png')
            elif (event.key == pygame.K_DOWN):
                sprite=pygame.image.load('down.png')

    keys_pressed = pygame.key.get_pressed()

    if keys_pressed[pygame.K_LEFT]:
        spritex -= 5

    if keys_pressed[pygame.K_RIGHT]:
        spritex += 5

    if keys_pressed[pygame.K_UP]:
        spritey -= 5

    if keys_pressed[pygame.K_DOWN]:
        spritey += 5

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

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