Worley Noise - Python Pygame

import pygame
import math
from random import randint

DW = DH = 400 # DisplayWidth, DisplayHeight
HDW = int(DW / 2) # HalfDisplayWidth
HDH = int(DH / 2) # HalfDisplayHeight
#FPS = 60

# colors
RED = [255, 0, 0]

class point:
    def __init__(s, x, y):
        s.x = x
        s.y = y

    def pos(s):
        return [s.x, s.y]

pygame.init()
PD = pygame.display.set_mode((DW, DH)) # PD = Primary Display
pygame.display.set_caption("Worley Noise")

# generate points
NUMBER_OF_POINTS = 25
points = [point(randint(0, DW), randint(0, DH)) for count in range(NUMBER_OF_POINTS)]

# draw
PA = pygame.PixelArray(PD) # get a pixel array of the primary display
for x in range(DW):
    for y in range(DH): # go through the all the pixels starting at 0, 0 and ending at DW, DH
        distances = [] # this will store the distances between the points and x, y from the loops above
        for index in range(NUMBER_OF_POINTS): # index will reference the points in the points list
            p = points[index]
            distance = math.hypot(x - p.x, y - p.y) # get the distance
            distances.append(distance) # add the distance to the list
        n = 0 # this value selects which distance to use to render the noise value. Remember index 0 in the distances list is the closet point to x, y
        distances.sort() # sort the distances so the closest is at index 0
        noise = int((distances[n] / (HDW / 2)) * 255) # hard to explain this but it's trying to keep the value noise less than 255
        if noise > 255: noise = 255 # if the noise value is greater than 255 then limit it to 255
        PA[x][y] = PD.map_rgb(noise, noise, noise) # apply the noise value to the pixel at x, y
PA.close() # close the pixel array
del PA # and delete (something about memory bleed)

# display the points
for p in points:
    pygame.draw.circle(PD, RED, p.pos(), 2) # 2 is the radius

pygame.display.update()

# press escape to get out!
while True:
    e = pygame.event.get()
    if pygame.key.get_pressed()[pygame.K_ESCAPE]: break

pygame.quit()