在pygame中用鼠标移动移动表面

Question

我正在尝试在 pygame 中使用鼠标运动移动由磁盘上的图像表示的表面，这是我的代码：

import sys
import pygame
from pygame.locals import *

WINDOW_SIZE = (600, 400)
FPS = 60


class System:
    def __init__(self, screen, surface):
        self.screen = screen
        self.surface = pygame.transform.scale(surface, (WINDOW_SIZE[0] * 2, WINDOW_SIZE[1] * 2))
        self.clock = pygame.time.Clock()

    def run(self):
        running = True
        moving = False
        offset_x = 0
        offset_y = 0

        while running:
            for event in pygame.event.get():
                if event.type == QUIT:
                    pygame.quit()
                    sys.exit()
                elif event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_ESCAPE:
                        pygame.quit()
                        sys.exit()
                    if event.key == pygame.K_SPACE:
                        mouse_pos = pygame.mouse.get_pos()
                        if self.surface.get_rect().collidepoint(mouse_pos):
                            moving = True
                elif event.type == pygame.KEYUP:
                    moving = False
                elif event.type == MOUSEMOTION and moving:
                    offset_x = event.rel[0]
                    offset_y = event.rel[1]
                elif event.type == MOUSEWHEEL:
                    offset_y -= event.y * 50

            self.screen.fill((105, 212, 229))

            self.screen.blit(self.surface, (offset_x, offset_y))

            pygame.display.update()
            self.clock.tick(FPS)


def run_system(screen, surface):
    system = System(screen, surface)
    system.run()


pygame.init()
screen = pygame.display.set_mode(WINDOW_SIZE, 0, 32)
surface = pygame.image.load('image.png')

if __name__ == '__main__':
    run_system(screen, surface)

表面无法正常移动。当我移动鼠标时它会快速摇晃。我正在使用 event.rel 来获得相对运动。也许这不是正确的方法。你有别的方法吗？ 附言：我也按空格键激活运动（moving变量）但这不是问题，这工作正常。

Answer 1

我发现我的错误：

代替 ：

offset_x = event.rel[0]
offset_y = event.rel[1]

和 ：

offset_x += event.rel[0]
offset_y += event.rel[1]