如何在 Pygame 中创建自动化 object

Question

I want to create an automated object that moves to a random location on the screen. The image is being shown but it is not moving to any location.

After importing pygame, setting up the display and loading the desired image, I defined the following parameters:

object_start_x = 200
object_start_y = -600
object_width = 60
object_height = 160
object_speed = 1

In the main game_loop , using the object() function I had previously defined, I took random integers as the x and y coordinates:

gameExit = False

while not gameExit:
    object(object_start_x, object_start_y, object_width, object_height)
    object_start_y += object_speed
        if object_start_y >= 50:
            object_start_y = 50
            random_locationx = random.randint(50, display_width - object_width)
            random_locationy = random.randint(50, display_height - object_height)

Then, I tried to change the object's position until it was the same as the random integer generated.

            if random_locationx < object_start_x:
                object_start_x - object_speed
                if object_start_x == random_locationx:
                    object_start_x == random_locationx
            elif random_locationx > object_start_x:
                object_start_x + object_speed
                if object_start_x == random_locationx:
                    object_start_x == random_locationx
            elif random_locationx == object_start_x:
                object_start_x == random_locationx

I repeated the same for object_start_y and random_locationy for the y coordinate. Although the image does appear, the object is not moving. Any ideas on what I can do to fix this?

Edit: In response to @Sal 's comment, Pygame moving an object does not address my problem as I want to automate an object randomly, not be able to move it myself.

Answer 1

There's not much code here, but there's a few issues, so I'll document those:

The random location is only generated once the object passes 50 pixels in y . Maybe this is by design?

if object_start_y >= 50:
   object_start_y = 50
   random_locationx = random.randint(50, display_width - object_width)
   random_locationy = random.randint(50, display_height - object_height)

It's not clear to me what the purpose of this code-section is, but it looks like the comparison operator == is being used, where the assignment operator = is intended.

if random_locationx < object_start_x:
    object_start_x - object_speed
    if object_start_x == random_locationx:
        object_start_x == random_locationx    # <-- HERE

Furthermore, even if this was an assignment, it's saying the equivalent of if my_fruit == 'apple', then my_fruit = 'apple' . It doesn't achieve a change.

I would pack the "Object" data into a structure. A python Rect object would be best, as it already supports x, y, width, height and comes with a great set of utility functions (for collisions etc.)

object_start_x = 200
object_start_y = -600
object_width   = 60
object_height  = 160

my_object_rect  = pygame.Rect( object_start_x, object_start_y, object_width, object_height )
my_object_speed = 1   # in Y

...

while not gameExit:

    # Move the object
    my_object_rect.y += my_object_speed
    if ( my_object_rect.y > 50 ):
        rand_x = random.randint(50, display_width - object_width)
        rand_y = random.randint(50, display_height - object_height)
        my_object_rect.topleft = ( rand_x, rand_y )