Pretty Circular Patterns (In processing)

#implementation of my Scratch project [ https://scratch.mit.edu/projects/121049579/#player ] in Processing.

import timeit
import math
start_time = timeit.default_timer()
theta = 0
timer = 0

def setup():
  size(800, 800)
  background(255)
  frameRate(66)
  noStroke()
  fill(0)

def draw():
    if mousePressed == False: # Click to disable clearing
        background(255)
    display()


def display():

    global theta
    global timer
    theta = 0
    pattern_id = 249 #_;
    timer = (timeit.default_timer() - start_time)

    while theta <= 360:
        temp = math.radians(theta)
        ellipse(cos(temp)*(width/2.25*sin(((timer/300)+(temp/5))*pattern_id)) + width/2,sin(temp)*(height/2.25*sin(((timer/300)+(temp/5))*pattern_id)) + height/2,3,3)
        theta = theta + 3.6