# Primes II

Inspired by my Cixel filter, I designed another prime visualisation program.

``````# Python 2.7.7 Code
# Pygame 1.9.1 (for Python 2.7.7)
# Jonathan Frech 22nd of August   , 2015
#         edited 11th of September, 2015``````

``````# importing needed modules
import pygame, sys, time, math, os, random

""" CLASSES """
# dummy class for global variables
class dummy():
pass

""" FUNCTIONS """
# prime check
def prime(n):
if n <= 1:
return False
for _ in range(2, n):
if n % _ == 0:
return False
return True

# quits the program
def quit():
sys.exit()

""" TICK; RENDER """
# tick function
def tick():
# handle events
for event in pygame.event.get():
# quit
if event.type == pygame.QUIT:
quit()

# render function
def render():
# circle width
n = 10

# loop
for _ in range(0, 10):
if main.N < main.WIDTH * main.HEIGHT / n / n:
# render circle
x, y = main.N % (main.WIDTH/n) * n + (n/2), main.N / (main.WIDTH/n) * n + (n/2)
if prime(main.N):
pygame.draw.circle(main.SURF, [255, 255, 255], [x, y], n/2)
else:
pygame.draw.circle(main.SURF, [50, 50, 50], [x, y], n/2)

# increase n
main.N += 1

# blit and flip
main.SCREEN.blit(main.SURF, [0, 0])
pygame.display.flip()

""" INIT """
# initialize program
def init():
main.WIDTH, main.HEIGHT = 1000, 500
main.SIZE = [main.WIDTH, main.HEIGHT]
main.SCREEN = pygame.display.set_mode(main.SIZE)
main.SURF = pygame.Surface(main.SIZE)

main.CAPTION = "Primes II"
main.TICKS = 0

main.N = 0

# functions
pygame.display.set_caption(main.CAPTION)

""" RUN """
# run function (uses tick() and render())
def run():
ticksPerSecond = 60
lastTime = time.time() * 1000000000
nsPerTick =  1000000000.0 / float(ticksPerSecond)

ticks = 0
frames = 0

lastTimer = time.time() * 1000
delta = 0.0

while True:
now = time.time() * 1000000000
delta += float(now - lastTime) / float(nsPerTick)
lastTime = now
shouldRender = False

while delta >= 1:
ticks += 1
main.TICKS += 1
tick()
delta -= 1
shouldRender = True

if shouldRender:
frames += 1
render()

if time.time() * 1000 - lastTimer >= 1000:
lastTimer += 1000

# debug
# print("Frames: " + str(frames) + ", ticks: " + str(ticks))

frames = 0
ticks = 0

# main variable
main = dummy()
init()

# start program
run()``````