How to simulate Jumping in Pygame for this particular code

问题

I have been trying to simulate the jump in the Pygame code but haven't been able to successfully implement it. There is a rectangle of dimension 10 by 10 and I want that rectangle to jump when SPACE is press. I am keeping this code independent of gravity for now.

import pygame
pygame.init()
ScreenLenX = 1000
ScreenLenY = 500
win = pygame.display.set_mode((ScreenLenX, ScreenLenY))
pygame.display.set_caption("aman")
run = True
Xcord = 100
Ycord = 100
length = 10
height = 10
vel = 2
xmove = 1
ymove = 1
while run:
  #pygame.time.delay(1)
    for event in pygame.event.get():
        print(event)
        if event.type ==pygame.QUIT:

            run = False

    if keys[pygame.K_RIGHT] and Xcord <= ScreenLenX-length:
        Xcord += vel
    if keys[pygame.K_LEFT] and Xcord >= 0:
        Xcord -= vel

     if keys[pygame.K_UP] and Ycord >= 0:
            Ycord -= vel
     if keys[pygame.K_DOWN] and Ycord <= ScreenLenY - height:
            Ycord += vel
     win.fill((0, 0, 0))
    pygame.draw.rect(win, (255, 0, 0), (Xcord, Ycord, length, height))
    keys = pygame.key.get_pressed()


    pygame.display.update()
pygame.quit()

回答1:

Add a variable jump and initialize it by 0, before the main loop:

jump = 0  
while run:
    # [...]

Only react on pygame.K_SPACE, if player is allowed to jump and stays on the ground. If this is fulfilled then set jump to the desired "jump" height:

if keys[pygame.K_SPACE] and Ycord == ScreenLenY - height:
    jump = 300

As long as jump is greater than 0, move the player upwards and decease jump by the same amount, in the main loop.
If the player is not jumping that let him fall dawn, till he reaches the ground:

 if jump > 0:
    Ycord -= vel
    jump -= vel
elif Ycord < ScreenLenY - height:
    Ycord += 1

See the demo, where I applied the suggestions to your code:

import pygame
pygame.init()

ScreenLenX, ScreenLenY = (1000, 500)
win = pygame.display.set_mode((ScreenLenX, ScreenLenY))
pygame.display.set_caption("aman")
Xcord, Ycord = (100, 100)
length, height = (10, 10)
xmove, ymove = (1, 1)
vel = 2
jump = 0

run = True
clock = pygame.time.Clock()
while run:
    #clock.tick(60)
    for event in pygame.event.get():
        print(event)
        if event.type ==pygame.QUIT:
            run = False

    keys = pygame.key.get_pressed()
    if keys[pygame.K_RIGHT] and Xcord <= ScreenLenX-length:
        Xcord += vel
    if keys[pygame.K_LEFT] and Xcord >= 0:
        Xcord -= vel

    if keys[pygame.K_SPACE] and Ycord == ScreenLenY - height:
        jump = 300

    if jump > 0:
        Ycord -= vel
        jump -= vel
    elif Ycord < ScreenLenY - height:
        Ycord += 1

    win.fill((0, 0, 0))
    pygame.draw.rect(win, (255, 0, 0), (Xcord, Ycord, length, height))

    pygame.display.update()

来源：https://stackoverflow.com/questions/54595777/how-to-simulate-jumping-in-pygame-for-this-particular-code