Python Pygame-检测钥匙是否被按下?
所以我在做一件简单的事情,并且一直在关注youtube上的教程。我有能力使用WASD移动女妖(我在我的飞船上使用了Halo中的图像),但我必须反复点击按键,而我希望能够通过按住按键来移动女妖。这是代码Python Pygame-检测钥匙是否被按下?,python,pygame,Python,Pygame,所以我在做一件简单的事情,并且一直在关注youtube上的教程。我有能力使用WASD移动女妖(我在我的飞船上使用了Halo中的图像),但我必须反复点击按键,而我希望能够通过按住按键来移动女妖。这是代码 import pygame from pygame.locals import * pygame.init() screen = pygame.display.set_mode((1440,900)) pygame.display.update() black=(0,0,0) white=
import pygame
from pygame.locals import *
pygame.init()
screen = pygame.display.set_mode((1440,900))
pygame.display.update()
black=(0,0,0)
white=(255,255,255)
background = pygame.image.load("G:/starfield.jpg")##loads the background
banshee = pygame.image.load("G:/banshee.png")###loads sprite of a spaceship that will move.
x=1
y=1
while True:
gamexit = False
while not gamexit:
screen.blit(background,(0,0))
screen.blit(banshee,(x,y))
pygame.display.update()
if x==1440 or x==0 or y==900 or y==0:#if it touches the sides of the window, the window closes
pygame.quit()
quit()
else:
for event in pygame.event.get():
pressed= pygame.key.get_pressed()
if event.type == pygame.QUIT:
gamexit=True
pygame.quit()
quit()
elif event.type==KEYDOWN:
if event.key==K_w:#moves banshee up if w pressed, same for the other WASD keys below
y=y-5
x=x
screen.blit(banshee,(x,y))
pygame.display.update()
elif event.key==K_a:
x=x-5
y=y
screen.blit(banshee,(x,y))
pygame.display.update()
elif event.key==K_d:
x=x+5
y=y
screen.blit(banshee,(x,y))
pygame.display.update()
elif event.key==K_s:
y=y+5
x=x
screen.blit(banshee,(x,y))
pygame.display.update()
我尝试过很多不同的方法(在这里和其他地方),但都没有什么效果。在这里,我能做什么不需要重写大量代码的事情吗
谢谢。首先,尝试添加变量
dx
和dy
来存储键的状态
elif event.type==KEYDOWN:
if event.key==K_w:#moves banshee up if w pressed, same for the other WASD keys below
dy = -5
elif event.key==K_a:
dx = -5
elif event.key==K_d:
dx = 5
elif event.key==K_s:
dy = 5
elif event.type==KEYUP:
if event.key==K_w:#moves banshee up if w pressed, same for the other WASD keys below
dy = 0
elif event.key==K_a:
dx = 0
elif event.key==K_d:
dx = 0
elif event.key==K_s:
dy = 0
x += dx
y += dy
screen.blit(banshee,(x,y))
pygame.display.update()
使用
pygame.key.get_pressed()
检查键是否被按下更容易,因为您不需要自己通过事件跟踪键的状态
我通常创建一个字典,将关键点映射到它们应该移动对象的方向
这样,查询pygame.key.get_pressed()的结果就很容易了。
您可以使用一些简单的向量数学来规范化移动方向,这样您可以以与仅沿x或y轴相同的速度沿对角线移动
此外,使用Rect
来存储对象的位置也更容易,因为pygame提供了许多与Rect
类一起使用的有用函数
import pygame, math
from pygame.locals import *
# some simple functions for vetor math
# note that the next pygame release will ship with a vector math module included!
def magnitude(v):
return math.sqrt(sum(v[i]*v[i] for i in range(len(v))))
def add(u, v):
return [ u[i]+v[i] for i in range(len(u)) ]
def normalize(v):
vmag = magnitude(v)
return [ v[i]/vmag for i in range(len(v)) ]
pygame.init()
screen = pygame.display.set_mode((1440,900))
screen_r = screen.get_rect()
pygame.display.update()
black=(0,0,0)
white=(255,255,255)
background = pygame.image.load("G:/starfield.jpg")##loads the background
# here we define which button moves to which direction
move_map = {pygame.K_w: ( 0, -1),
pygame.K_s: ( 0, 1),
pygame.K_a: (-1, 0),
pygame.K_d: ( 1, 0)}
banshee = pygame.image.load("G:/banshee.png")
# create a Rect from the Surface to store the position of the object
# we can pass the initial starting position by providing the kwargs top and left
# another useful feature is that when we create the Rect directly from the
# Surface, we also have its size stored in the Rect
banshee_r = banshee.get_rect(top=50, left=50)
speed = 5
gameexit = False
while not gameexit:
# exit the game when the window closes
for event in pygame.event.get():
if event.type == pygame.QUIT:
gameexit = True
# if it touches the sides of the window, end the game
# note how easy this part becomes if you use the Rect class
if not screen_r.contains(banshee_r):
gameexit = True
# get all pressed keys
pressed = pygame.key.get_pressed()
# get all directions the ship should move
move = [move_map[key] for key in move_map if pressed[key]]
# add all directions together to get the final direction
reduced = reduce(add, move, (0, 0))
if reduced != (0, 0):
# normalize the target direction and apply a speed
# this ensures that the same speed is used when moving diagonally
# and along the x or y axis. Also, this makes it easy to
# change the speed later on.
move_vector = [c * speed for c in normalize(reduced)]
# move the banshee
# Another useful pygame functions for Rects
banshee_r.move_ip(*move_vector)
screen.blit(background,(0,0))
# we can use banshee_r directly for drawing
screen.blit(banshee, banshee_r)
pygame.display.update()