使多个对象自动移动以在pygame中指定了多少个对象

Question

I am creating a tiled game that has NPC's in it. I can create one NPC successfully but when I draw more than one they share the same position after a few seconds of the code running. I created this sample to demonstrate what I mean.

import pygame, random, math

screen = pygame.display.set_mode((800,600)) 

NPCP = {'Bob' : (2,6), 'John' : (4,4)} # 25, 19 max width and height
pygame.time.set_timer(pygame.USEREVENT, (100))
sMove = True

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()
        if event.type == pygame.USEREVENT:
            sMove = True
    screen.fill((0,0,255))
    for name in NPCP:
        x,y = NPCP.get(name)
        pygame.draw.rect(screen, (255,0,0), (x*32,y*32,50,50))
        if sMove == True:
            move = random.randint(1,4)
            sMove = False
        if move == 1:
            if math.floor(y) > 2:
                y -= 2
        if move == 2:
            if math.floor(y) < 17:
                y += 2
        if move == 3:
            if math.floor(x) < 23:
                x += 2
        if move == 4:
            if math.floor(x) > 2:
                x -= 2
        print(x,y)
        NPCP[name] = (x,y)

    pygame.display.flip()

I use a dictionary to create these NPC's or rectangles in this case. I move them around with a timer and a random number ranging from 1 to 4 to select which movement to do. I use a for loop to run for each NPC. I would like to know how to allow these rectangles to not move around the same way and for the position not to eventually change to the same position and move differently from each other. I also want to have it that it uses the dictionary to do so.

Answer 1

If you want to move then objects individually, then you've to generate a random direction for each object.

In your code only on direction is generated for all objects, because sMove is set False immediately after the direction for the first object was generated. This direction is used for all the objects.
Further the move direction ( move ) is never reset to 0. This causes that the last random direction is applied in all following frames, till the direction is changed again.

 if sMove == True: move = random.randint(1,4) sMove = False 

Reset sMove reset move after the loop and, to solve the issue:

for name in NPCP:
    x,y = NPCP.get(name)
    pygame.draw.rect(screen, (255,0,0), (x*32,y*32,50,50))
    if sMove == True:
        move = random.randint(1,4)
    if move == 1:
        if math.floor(y) > 2:
            y -= 2
    if move == 2:
        if math.floor(y) < 16:
            y += 2
    if move == 3:
        if math.floor(x) < 22:
            x += 2
    if move == 4:
        if math.floor(x) > 2:
            x -= 2
    print(x,y)
    NPCP[name] = (x,y)

sMove = False # wait for next timer
move = 0      # stop moving