THE VERY FIRST TRIAL

I used the example from the lecture to start off my project 2. The "Random bugs", I tried to understand the codes though.

Comment : simple but really effective. Furthermore, the random source comes from the center.
CODE
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import math
import random

def rnd11():
    return 2.*random.random()-1.
   
SIZE = 600
xpos = SIZE/2.
ypos = SIZE/2.

def setup():
    global xpos,ypos
    size(SIZE, SIZE)
    smooth()
    fill(0,0,0,1)
    background(255)
   
def draw():
    global xpos, ypos
    rect(xpos,ypos,1,1)
    xpos = xpos + rnd11()
    ypos = ypos + rnd11()
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