如何使图像面对鼠标并在 Pygame 中使用键移动？

如何解决如何使图像面对鼠标并在 Pygame 中使用键移动？

这听起来可能令人困惑，所以我会尽力描述。

我写了一些简单的代码，在窗口中间有一个图像，当鼠标悬停在窗口上时，它将面向鼠标位置（旋转以面向它）。这很好，但我在尝试使用 WASD 移动图像时也遇到了大麻烦。

我想为图像添加基本的自上而下的 WASD 移动，但无论我尝试什么，它总是被旋转代码“覆盖”（我认为），使其无法移动并停留在屏幕的直接中间。>

我能做的最好的事情就是将它从中间向任何方向移动一定量（例如 1 个像素的移动），但是如果我按住键，它会从中间保持 1 个像素，并且只要我放开它再次居中。 这是我最深入的代码，但它仍然无法工作。您可以自己测试，您只需要更改“光标”图像即可。

import math,pygame

pygame.init()
window = pygame.display.set_mode((1280,800))
cursor = pygame.image.load("images/cursor.png").convert_alpha()

#   0 - image is looking to the right
#  90 - image is looking up
# 180 - image is looking to the left
# 270 - image is looking down
correction_angle = 90

run = True
while run:
    pygame.time.delay(2)
    
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    #cursor postion and rectangle
    cursor_pos  = window.get_rect().center
    cursor_rect = cursor.get_rect(center = (cursor_pos))

    #calculates mouse position,angle and rotation for image
    mx,my = pygame.mouse.get_pos()
    dx,dy = mx - cursor_rect.centerx,my - cursor_rect.centery
    angle = math.degrees(math.atan2(-dy,dx)) - correction_angle

    #rotated image surface
    rot_image      = pygame.transform.rotate(cursor,angle)
    rot_image_rect = rot_image.get_rect(center = cursor_rect.center)


    #simple movement / key presses
    keys = pygame.key.get_pressed()
    if keys[pygame.K_a]:
        rot_image_rect.x -= 1
    if keys[pygame.K_d]:
        rot_image_rect.x += 1
    if keys[pygame.K_w]:
        rot_image_rect.y -= 1
    if keys[pygame.K_s]:
        rot_image_rect.y += 1

    
    #bliting all images and surfaces to screen and update screen.
    window.fill((220,216,192))
    window.blit(rot_image,rot_image_rect.topleft)
    pygame.display.update()




pygame.quit()
exit()

解决方法

您必须更改 cursor_pos 而不是 rot_image_rect。注意 rot_image_rect 是根据 cursor_pos 计算的。因此，如果您想更改 rot_image_rect 的位置，您必须更改 cursor_pos:

cursor_pos = list(window.get_rect().center)

run = True
while run:
    # [...]

     #simple movement / key presses
    keys = pygame.key.get_pressed()
    if keys[pygame.K_a]:
        cursor_pos[0] -= 1
    # [...]

完整示例：

import math,pygame

pygame.init()
window = pygame.display.set_mode((1280,800))
cursor = pygame.image.load("images/cursor.png").convert_alpha()

#   0 - image is looking to the right
#  90 - image is looking up
# 180 - image is looking to the left
# 270 - image is looking down
correction_angle = 90

cursor_pos = list(window.get_rect().center)

run = True
while run:
    pygame.time.delay(2)
    
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    #simple movement / key presses
    keys = pygame.key.get_pressed()
    if keys[pygame.K_a]:
        cursor_pos[0] -= 1
    if keys[pygame.K_d]:
        cursor_pos[0] += 1
    if keys[pygame.K_w]:
        cursor_pos[1] -= 1
    if keys[pygame.K_s]:
        cursor_pos[1] += 1

    #cursor postion and rectangle
    cursor_rect = cursor.get_rect(center = (cursor_pos))

    #calculates mouse position,angle and rotation for image
    mx,my = pygame.mouse.get_pos()
    dx,dy = mx - cursor_rect.centerx,my - cursor_rect.centery
    angle = math.degrees(math.atan2(-dy,dx)) - correction_angle

    #rotated image surface
    rot_image      = pygame.transform.rotate(cursor,angle)
    rot_image_rect = rot_image.get_rect(center = cursor_rect.center)
    
    #bliting all images and surfaces to screen and update screen.
    window.fill((220,216,192))
    window.blit(rot_image,rot_image_rect.topleft)
    pygame.display.update()


pygame.quit()
exit()