我该如何在游戏中加入跳跃

Question

import pygame
import time
pygame.init()

display_width = (1000)
display_height = (480)


black = (255,50,0)
white  = (0,60,7)
blue = (0,205,205)

kled1_width = 30
kled1_height = 45

ground1_height = 300

screen = pygame.display.set_mode((display_width,display_height))
pygame.display.set_caption(" kled ")
clock = pygame.time.Clock()

gameDisplay = screen

kled1IMG = pygame.image.load("IMG.png")

def kled1(x,y):
    gameDisplay.blit(kled1IMG,(x,y))


def game_loop():

    x = (1)
    y = (340)


    x_change = 0

    y_change = 0


    gameExit = False

    while not gameExit:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                gameExit = True

            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    x_change = -5

                elif event.key == pygame.K_RIGHT:
                    x_change =  5

                elif event.key == pygame.K_UP:
                    y_change = -15

                elif event.key == pygame.K_DOWN:
                    y_change = 5

            if event.type == pygame.KEYUP:
                if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT or event.key == pygame.K_LEFT and pygame.K_r or event.key == pygame.K_RIGHT and pygame.K_2:
                    x_change = 0
            if event.type == pygame.KEYUP:
                if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
                    y_change = 0


        x += x_change
        y += y_change

        gameDisplay.fill(blue)

        pygame.draw.rect(gameDisplay, white, [1, 400, 1000,ground1_height])

        kled1(x,y)

#prevents from going into ground
        if y > ground1_height:
            y_change = 0

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

game_loop()
pygame.quit()
quit()

如果我按一下▲一次，图像会从图像的当前位置向上移动15个空格，然后在0.5秒后下降15个空格？基本上，这是一个像马里奥这样的跳跃游戏，我会添加平台和其他东西。另外，我想知道如何确保你在空中不能双跳！抱歉，我不是一个好的程序员，我只是需要这个游戏的帮助。在

我使用的是python2.7

Answer 1

添加一个GRAVITY常量，将其添加到y_change的每个帧中，以使播放器向下加速。当玩家接触地面时，将on_ground变量设置为True，当用户跳转时，检查他/他是否是on_ground，然后设置为False，以防出现双跳。在

import pygame

pygame.init()
screen = pygame.display.set_mode((1000, 480))
clock = pygame.time.Clock()

GREEN = (110, 190, 27)
BLUE = (0, 185, 225)

PLAYER_IMG = pygame.Surface((30, 45))
PLAYER_IMG.fill((250, 120, 0))

GRAVITY = 1


def game_loop():
    x = 1
    y = 340
    x_change = 0
    y_change = 0
    on_ground = True
    ground_height = 400

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                return
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    x_change = -5
                elif event.key == pygame.K_RIGHT:
                    x_change =  5
                elif event.key == pygame.K_UP:
                    if on_ground:
                        # Set the y-velocity to a negative
                        # value to jump.
                        y_change = -20
                        on_ground = False
                elif event.key == pygame.K_DOWN:
                    y_change = 5
            elif event.type == pygame.KEYUP:
                if event.key == pygame.K_LEFT and x_change < 0:
                    x_change = 0
                elif event.key == pygame.K_RIGHT and x_change > 0:
                    x_change = 0

        # Adjust the y-velocity by adding the gravity each frame.
        y_change += GRAVITY
        # Move the player.
        x += x_change
        y += y_change
        # Stop the player on the ground.
        if y > ground_height:
            # Stop the movement along the y-axis.
            y_change = 0
            y = ground_height
            on_ground = True

        screen.fill(BLUE)
        pygame.draw.rect(screen, GREEN, [0, 445, 1000, 35])
        screen.blit(PLAYER_IMG, (x, y))

        pygame.display.update()
        clock.tick(60)

game_loop()
pygame.quit()

{如果你想看一个完整的平台。在