[英]Player movement stops when direction reverses in Pygame
我在和pygame玩弄,最后我正在努力開發pong克隆。 我使用箭頭鍵實現了玩家的移動,一旦我從上升切換到立即下降,我的播放器就會死機,直到再次按下該方向鍵后才會移動。 這是我的代碼:
import sys, pygame
pygame.init()
display_width = 640
display_height = 480
display = pygame.display.set_mode((display_width,display_height))
pygame.display.set_caption("Test Game")
black = (0,0,0)
white = (255,255,255)
clock = pygame.time.Clock()
running = True
class Player:
def __init__(self,x,y,hspd,vspd,color,screen):
self.x = x
self.y = y
self.hspd = hspd
self.vspd = vspd
self.color = color
self.screen = screen
def draw(self):
pygame.draw.rect(self.screen,self.color,(self.x,self.y,32,32))
def move(self):
self.x += self.hspd
self.y += self.vspd
player = Player(0,0,0,0,black,display)
while running:
clock.tick(60)
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
if event.type == pygame.KEYUP:
if event.key == pygame.K_RIGHT:
player.hspd = 0
if event.key == pygame.K_LEFT:
player.hspd = 0
if event.key == pygame.K_UP:
player.vspd = 0
if event.key == pygame.K_DOWN:
player.vspd = 0
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_RIGHT:
player.hspd = 4
if event.key == pygame.K_LEFT:
player.hspd = -4
if event.key == pygame.K_UP:
player.vspd = -4
if event.key == pygame.K_DOWN:
player.vspd = 4
#Clear the screen
display.fill(white)
#Move objects
player.move()
#Draw objects
player.draw()
#Update the screen
pygame.display.flip()
print "I made it!"
pygame.quit()
sys.exit()
我建議您使用key.get_pressed()
來檢查當前按下的鍵集。
在您的場景中-當您按下並釋放(按此順序)時-速度設置為0,因此您需要檢查的按鍵不僅限於當前事件。
這是相關部分的工作版本:
def current_speed():
# uses the fact that true = 1 and false = 0
currently_pressed = pygame.key.get_pressed()
hdir = currently_pressed[pygame.K_RIGHT] - currently_pressed[pygame.K_LEFT]
vdir = currently_pressed[pygame.K_DOWN] - currently_pressed[pygame.K_UP]
return hdir * 4, vdir * 4
while running:
clock.tick(60)
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
player.hspd, player.vspd = current_speed()
#Clear the screen
display.fill(white)
#Move objects
player.move()
#Draw objects
player.draw()
#Update the screen
pygame.display.flip()
您的問題在這里:
if event.type == pygame.KEYUP:
if event.key == pygame.K_RIGHT:
player.hspd = 0
if event.key == pygame.K_LEFT:
player.hspd = 0
if event.key == pygame.K_UP:
player.vspd = 0
if event.key == pygame.K_DOWN:
player.vspd = 0
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_RIGHT:
player.hspd = 4
if event.key == pygame.K_LEFT:
player.hspd = -4
if event.key == pygame.K_UP:
player.vspd = -4
if event.key == pygame.K_DOWN:
player.vspd = 4
我猜想您在立即切換鍵時仍會消耗掉按鍵事件,這意味着只要第一個事件尚未觸發其按鍵向上事件,就不會觸發其他按鍵按下事件。
編輯:也許最好檢查玩家是否在移動,如果只是在反向移動。 然后,您只需要檢查down事件。 否則,您的活動將被使用,並且無法正確檢查。 對於您的方法,您需要存儲自上一幀以來發生的鍵事件,並檢查該列表。
為了擴大LPK的答案,可能在處理您的向上鍵(來自event.key == pygame.K_UP)之前先處理您的向下鍵(對於event.key == pygame.K_DOWN)。 因此,當兩者都按下時(您可以確認這一點),您可能會感覺到運動,直到松開向上鍵。
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