python - 按下回车键后如何让字符串出现

Question

我正在为我的 child 制作抽认卡游戏。它是关于恐龙的。我无法让“恭喜，你做对了”出现在屏幕上。我已经把我的代码移到了各处，但没有运气。有人可以帮帮我吗？

明确地说，我想要发生的是当用户按下键盘上的数字 1、2、3 时，如果该键是与问题相关的正确答案，则消息“恭喜，你知道了正确的!”应该出现在屏幕上。

我知道现在的 keydown 事件是返回键，但我这样做只是为了测试目的。这对于 testtext 变量也是一样的。我正在使用该变量来查看是否可以将“Hello WOrld”打印到屏幕上。

我确实感觉它与正在运行的循环有关。我的猜测是它确实出现了几分之一秒，但在任何人看到之前就消失了。

import pygame, random

pygame.font.init()
pygame.init()

font = pygame.font.Font(None, 48)
#Created the window display
size = width, height = 800,800
screen = pygame.display.set_mode(size)
#Loads the images of the starting game Trex
#t_rex = pygame.image.load('trex1.png')
##Places the image on the screen
#screen.blit(t_rex,(150,50))



count = 0
score = 0
active = False

testtext = font.render("Hello WOrld", True, (250, 250, 250))







#The below code keeps the display window open until user decides to quie app


crashed = False
while not crashed:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            crashed = True
        if event.type==pygame.KEYDOWN:
            if event.key==pygame.K_RETURN:
                screen.blit(testtext, (200,699))

    while count < 2:
        screen.fill(0)

        dinoQuestions = ["Does a t-rex eat meat?\n","Does a trycerotopes have 3 horns?\n"]

        dinoAnswer = ["Yes\n", "No\n","Maybe\n"]

        wordnum = random.randint(0, len(dinoQuestions)-1)

        mainpic = pygame.image.load("trex1.png")

        screen.blit(mainpic, (150, 20))

        options = [random.randint(0, len(dinoAnswer)-1),random.randint(0, len(dinoAnswer)-1)]

        options[random.randint(0,1)] = wordnum

        question_display = font.render(dinoQuestions[wordnum].rstrip('\n'),True, (255, 255, 255))
        text1 = font.render('1 - ' + dinoAnswer[options[0]].rstrip('\n'),True, (255, 255, 255))
        text2 = font.render('2 - ' + dinoAnswer[options[1]].rstrip('\n'),True, (255, 255, 255))

        #the below code is for testing purposes only


        screen.blit(question_display,(200, 590))
        screen.blit(text1, (200, 640))
        screen.blit(text2, (200, 690))


        count = count + 1
        pygame.display.flip()

Answer 1

当您稍后调用 screen.fill(0) 时，您在处理 Return 键按下事件时对屏幕表面执行的 blit 将被覆盖。

我稍微重新安排了您的代码并添加了在适当的按键时显示结果。

import pygame
import random

pygame.init()
pygame.font.init()

font = pygame.font.Font(None, 48)
size = width, height = 800,800
screen = pygame.display.set_mode(size) #Created the window display
count = 0
score = 0
active = False

white = pygame.color.Color("white")
black = pygame.color.Color("black")
green = pygame.color.Color("green")

# load/create static resources once
mainpic = pygame.image.load("trex1.png")

testtext = font.render("Hello World", True, (250, 250, 250))
correct_text = font.render("Correct! Well Done!", True, green)

clock = pygame.time.Clock() # for limiting FPS

dinoQuestions = ["Does a t-rex eat meat?","Does a triceratops have 3 horns?"]
dinoAnswer = ["Yes", "No","Maybe"]

# initialise state
show_hello = False
show_correct = False
update_questions = True  # need to update questions on the first iteration
finished = False

while not finished:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            finished = True
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RETURN:
                show_hello = not show_hello # toggle flag for later display
            elif event.key == pygame.K_SPACE:
                update_questions = True
            elif event.key in [pygame.K_1, pygame.K_2]:
                # an answer has been selected
                # pygame.K_1 is 0, pygame.K_2 is 1
                if dinoAnswer[event.key - pygame.K_1] == "Yes":
                    show_correct = True
                    count += 1
                else:
                    show_correct = False

    screen.fill(black)
    screen.blit(mainpic, (150, 20))
    if show_hello:
        screen.blit(testtext, (200,199))

    if show_correct:
        screen.blit(correct_text, (200, 300))

    if update_questions:
        random.shuffle(dinoQuestions)
        random.shuffle(dinoAnswer)
        question_display = font.render(dinoQuestions[0],True, white)
        text1 = font.render('1 - ' + dinoAnswer[0],True, white)
        text2 = font.render('2 - ' + dinoAnswer[1],True, white)
        update_questions = False
        show_correct = False

    # Display the Question
    screen.blit(question_display,(200, 590))
    screen.blit(text1, (200, 640))
    screen.blit(text2, (200, 690))
    # count = count + 1
    pygame.display.flip()
    clock.tick(60)

希望这个框架足以供您扩展。

如果您对代码的任何部分有任何疑问，请告诉我。