Why do my circles on pygame keep despawning and re-spawning?

user_12964308 0
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When I run this program I want the game to spawn one larger movable dot and hundreds of smaller non-movable dots at random locations. However, when I run the program the smaller dots keep despawning and respawning. I think it has something to do with the pygame.display.update() function but I am not entirely sure. How do I fix this problem?

from pygame import *
import random as rd

p_1_x = 200
p_1_y = 200
p_1_change_x = 0

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


def p_1(x, y):
    player_1 = draw.circle(screen, (0, 0, 0), (x, y), 15)


def drawwing():
    for i in range(0, 250):
        x = rd.randint(100, 700)
        y = rd.randint(100, 500)
        dot = draw.circle(screen, (55, 255, 155), (x, y), 5)


while True:
    for events in event.get():
        if events.type == QUIT:
            quit()
        if events.type == KEYDOWN:
            if events.key == K_RIGHT:
                p_1_change_x = 1
            if events.key == K_LEFT:
                p_1_change_x = -1

        if events.type == KEYUP:
            if events.key == K_RIGHT or K_LEFT:
                p_1_change_x = 0
                p_1_change_y = 0

    screen.fill((255, 255, 255))
    p_1_x += p_1_change_x

    p_1(p_1_x, p_1_y)
    display.update()
    drawwing()
    display.update()
display pygame python
2 Answers

If you want stationary dots, use something like this instead:

dots = list((rd.randint(100,700),rd.randint(100,500)) for i in range(0,250))

def drawwing():
    for x,y in dots:
        draw.circle(screen, (55, 255, 155), (x, y), 5)
user_9255920

I made a class for dots:

class Dot():
    SIZE = 5
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def draw(self):
        draw.circle(screen, self.color, (self.x, self.y), Dot.SIZE)

Then I made an array and generate NUMBER_OF_DOTS like this:

dots = []

for i in range(NUMBER_OF_DOTS):
    x = rd.randint(100, 700)
    y = rd.randint(100, 500)
    dots.append(Dot(x,y))

and in the while loop, after filling the whole scene by white color, redraw all dots like this:

while True:
    screen.fill((255, 255, 255))
    ...
    for dot in dots:
        dot.draw()

Happy Coding https://github.com/peymanmajidi/Ball-And-Dots-Game__Pygame

user_45410970
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