在pygame中计算重力的最佳方法是什么？我基本上只需要它，所以当玩家按下“向上”时，角色就会跳起来。这是我目前为止的代码(只有一个白色屏幕和一个移动的红色块)import pygame

import random

# Define colors

black = ( 0, 0, 0)

white = ( 255, 255, 255)

green = ( 0, 255, 0)

red = ( 255, 0, 0)

#Classes

class Player(pygame.sprite.Sprite):

def __init__(self, color, width, height):

pygame.sprite.Sprite.__init__(self)

self.image = pygame.Surface([width, height])

self.image.fill(color)

self.rect = self.image.get_rect()

def move(self, x_change, y_change):

self.rect.x += x_change

self.rect.y += y_change

#Lists

all_sprites_list = pygame.sprite.Group()

#Spawn player

player = Player(red,16,16)

all_sprites_list.add(player)

player.rect.x = 0

player.rect.y = 484

#Initalize

pygame.init()

#Set the width and height of the screen [width,height]

screen_height = 700

screen_width = 500

size=[screen_height,screen_width]

screen=pygame.display.set_mode(size)

#Name on top tab

pygame.display.set_caption("My Game")

#DONT CHANGE

done = False

clock=pygame.time.Clock()

#MAIN LOOP

while done == False:

for event in pygame.event.get(): # User did something

if event.type == pygame.QUIT: # If user clicked close

done = True # Quit

if event.type == pygame.KEYUP:

# If it is an arrow key, reset vector back to zero

if event.key == pygame.K_LEFT:

None

keyDown = pygame.key.get_pressed()

if keyDown[pygame.K_RIGHT]:

player.move(3, 0)

if keyDown[pygame.K_LEFT]:

player.move(-3, 0)

if keyDown[pygame.K_DOWN]:

player.move(0, 3)

if keyDown[pygame.K_UP]:

player.move(0,-3)

#If player hits side of screen, do this

if player.rect.x < 0:

player.rect.x = 0

if player.rect.x > 684:

player.rect.x = 684

if player.rect.y < 0:

player.rect.y = 0

if player.rect.y > 484:

player.rect.y = 484

#Clear screen

screen.fill(white)

#Drawing

all_sprites_list.draw(screen)

#FPS Lock

clock.tick(60)

#Update screen

pygame.display.flip()

# Close the window and quit.

pygame.quit()