如何使事件仅在按下电子游戏中的键盘时才能工作

Question

我只想让恐龙在我按空格键的时候才能躲开。

换句话说，如果我拿掉空格键，我想让恐龙回到跑步的位置。

但是现在，当我按空格键的时候，恐龙就会掉下来，不会再爬了。

我真的不知道如何修复它来实现这个功能。

import pygame
import os

pygame.init()

SCREEN_HEIGHT = 600
SCREEN_WIDTH = 1100
SCREEN = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))

RUNNING = [pygame.image.load(os.path.join("Assets/Dino", "DinoRun1.png")),
           pygame.image.load(os.path.join("Assets/Dino", "DinoRun2.png"))]
JUMPING = pygame.image.load(os.path.join("Assets/Dino", "DinoJump.png"))
DUCKING = [pygame.image.load(os.path.join("Assets/Dino", "DinoDuck1.png")),
           pygame.image.load(os.path.join("Assets/Dino", "DinoDuck2.png"))]

class Dino:
    X_POS = 80
    Y_POS = 400
    Y_POS_DUCK = 430

    def __init__(self):
        self.run_img = RUNNING
        self.duck_img = DUCKING
        self.dino_run = True
        self.dino_duck = False

        self.step_index = 0
        self.image = self.run_img[0]
        self.dino_rect = self.image.get_rect()
        self.dino_rect.x = self.X_POS
        self.dino_rect.y = self.Y_POS

    def update(self, userInput):
        if self.dino_run:
            self.run()
        if self.dino_duck:
            self.duck()

        if self.step_index >= 10:
            self.step_index = 0

        if userInput[pygame.K_UP]:
            self.dino_run = True
            self.dino_duck = False
            self.Y_POS = 100
            self.Y_POS_DUCK = 130
        elif userInput[pygame.K_DOWN]:
            self.dino_run = True
            self.dino_duck = False
            self.Y_POS = 400
            self.Y_POS_DUCK = 430
        ***elif userInput[pygame.K_SPACE]:
            self.dino_run = False
            self.dino_duck = True***

    def run(self):
        self.image = self.run_img[self.step_index // 5]
        self.dino_rect = self.image.get_rect()
        self.dino_rect.x = self.X_POS
        self.dino_rect.y = self.Y_POS
        self.step_index += 1

    def duck(self):
        self.image = self.duck_img[self.step_index // 5]
        self.dino_rect = self.image.get_rect()
        self.dino_rect.x = self.X_POS
        self.dino_rect.y = self.Y_POS_DUCK
        self.step_index += 1

    def draw(self, SCREEN):
        SCREEN.blit(self.image, (self.dino_rect.x, self.dino_rect.y))


def main():
    run = True
    clock = pygame.time.Clock()
    player = Dino()

    while run:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False

        SCREEN.fill((255, 255, 255))
        userInput = pygame.key.get_pressed()

        player.draw(SCREEN)
        player.update(userInput)

        clock.tick(30)
        pygame.display.update()

Answer 1

在update方法中，添加另一个if语句以检查空间条何时释放：

...

elif userInput[pygame.K_SPACE]:
    self.dino_run = False
    self.dino_duck = True
if not userInput[pygame.K_SPACE]:
    self.dino_run = True
    self.dino_duck = False