如何在pygame中为绘图设置动画（运动）

Question

我一直在尝试为绘图元素制作动画但没有成功。 我可以对导入的图像进行动画处理，但是当我尝试对 pygame 生成的图形进行动画处理时，它们仍然是静态的。

编辑：“动画”是指“移动”。 就像使圆在 x 和 y 方向上移动一样。

这是我的代码：

import pygame, sys
from pygame.locals import *

pygame.init()

FPS = 60
WIDTH = 600
HEIGHT = 500
fpsClock = pygame.time.Clock()
DISPLAYSURF = pygame.display.set_mode((WIDTH, HEIGHT), 0, 32)
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
ballx = WIDTH / 2
bally = HEIGHT / 2
ball_vel = [1, 1]
ball_pos =(ballx, bally)
RADIUS = 20

# Game Loop:
while True:
    # Check for quit event
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    # Erase the screen (I have tried with and without this step)
    DISPLAYSURF.fill(BLACK)

    # Update circle position
    ballx += ball_vel[0]
    bally += ball_vel[1]

    # Draw Circle (I have tried with and without locks/unlocks)
    DISPLAYSURF.lock()
    pygame.draw.circle(DISPLAYSURF, WHITE, ball_pos, RADIUS, 2)
    DISPLAYSURF.unlock()

    # Update the screen
    pygame.display.update()
    fpsClock.tick(FPS)

我尝试过锁定/解锁显示表面和不锁定/解锁显示表面（如文档所示）。 在更新屏幕之前，我尝试过擦除屏幕和不擦除屏幕（正如一些教程所建议的那样）。 我就是无法让它工作。

我究竟做错了什么？ 你如何为绘图元素制作动画？

谢谢你的时间。

Answer 1

您没有更新ball_pos元组：您将其设置为起始坐标：

ballx = WIDTH / 2
bally = HEIGHT / 2
ball_vel = [1, 1]
ball_pos =(ballx, bally)

你后来更新了ballx和bally，但是再也没有将ball_pos再次设置为ballx和bally。 在while循环中，在设置ballx和bally之后，执行以下操作：

ball_pos = (ballx,bally)

Answer 2

import pygame, sys
from pygame.locals import *

pygame.init()

FPS = 60
WIDTH = 600
HEIGHT = 500
fpsClock = pygame.time.Clock()
DISPLAYSURF = pygame.display.set_mode((WIDTH, HEIGHT), 0, 32)
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
ballx = WIDTH / 2
bally = HEIGHT / 2
ball_vel = [1, 1]
ball_pos =(ballx, bally)
RADIUS = 20

# Game Loop:
while True:
    # Check for quit event
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    # Erase the screen (I have tried with and without this step)
    DISPLAYSURF.fill(BLACK)

    # Update circle position
    ballx += ball_vel[0]
    bally += ball_vel[1]
    ball_pos =(ballx, bally)

    # Draw Circle (I have tried with and without locks/unlocks)
    pygame.draw.circle(DISPLAYSURF, WHITE, ball_pos, RADIUS, 2)

    # Update the screen
    pygame.display.flip()
    fpsClock.tick(FPS)

flip = update（）