Pygame：如何让我的图像下降？

我试图让物体像在地球上一样下落。我已经让它们到了我想要的地方，但我似乎无法为它们设置动画。

这就是我想要落下的物体

import pygame

class circle():

    def __init__(self, screen):
        planet_color = (255,0,0)
        planet_radius = 20
        self.screen = screen
        ev = pygame.event.get()

        self.image = pygame.image.load('../images/jupiter.bmp')
        self.image = pygame.transform.scale(self.image, (80, 80))


    def blitme(self):
        self.x = pygame.mouse.get_pos()
        self.rect = self.image.get_rect()
        self.rect.center = self.x
        self.screen.blit(self.image, self.rect)

这是运行它的代码。单击鼠标时，会在单击鼠标的位置生成木星的小图片。我怎样才能让这个图像下降？

import pygame
import gravfunc as gf
from gravfunc import circle
import sys


def run_game():
    screen_height = 670
    screen_width = 1270
    pygame.init()
    screen = pygame.display.set_mode((screen_width, screen_height))
    screen.fill((10,10,30))
    running = True

    circ = circle(screen)


    while running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_q:
                    sys.exit()
            elif event.type == pygame.MOUSEBUTTONDOWN:
                circ.blitme()


        pygame.display.flip()


run_game()

给你的班级一个self.speed_y属性并添加GRAVITY每帧都对其进行加速以加速对象。我还添加了一个self.pos_y属性因为pygame.Rects 不能使用浮点数作为坐标。所以，

1. 提高速度
2. 将速度添加到位置 (self.pos_y)
3. 分配self.pos_y to self.rect.y.

由于您已经在使用一个类，我建议将其设为 pygame sprite 子类（继承自pygame.sprite.Sprite）。然后您可以将所有圆圈添加到pygame.sprite.Group并通过调用更新和绘制它们sprite_group.update() and sprite_grop.draw(screen).

import pygame


GRAVITY = .2  # Pretty low gravity.

class Circle(pygame.sprite.Sprite):

    def __init__(self, pos, screen):
        super().__init__()
        self.screen = screen
        self.image = pygame.Surface((80, 80), pygame.SRCALPHA)
        pygame.draw.circle(self.image, (30, 90, 150), (40, 40), 40)
        self.rect = self.image.get_rect(center=pos)
        self.pos_y = pos[1]
        self.speed_y = 0

    def update(self):
        self.speed_y += GRAVITY
        self.pos_y += self.speed_y
        self.rect.y = self.pos_y

        if self.pos_y > self.screen.get_height():
            self.kill()  # Remove off-screen circles.


def run_game():
    pygame.init()
    screen = pygame.display.set_mode((1270, 670))
    clock = pygame.time.Clock()
    running = True
    circles = pygame.sprite.Group(Circle((600, 0), screen))

    while running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                return
            elif event.type == pygame.MOUSEBUTTONDOWN:
                circles.add(Circle(event.pos, screen))

        circles.update()

        screen.fill((10, 10, 30))
        circles.draw(screen)

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


run_game()
pygame.quit()