02_Setup and Draw

[maxsol]

size(200,200)

speed(25)

def setup():
global frame, n
frame = 1
n = 0
def draw():
global frame, n
frame += 1
n += 1

background(0)

if n >= 240:
n = frame-frame

for i in range(0,20):
stroke(1-i/20.0)
strokewidth(2)
line(0, n-i*2, WIDTH, n-i*2)

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Тоже самое, но движение если mousedown:
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size(200,200)

speed(25)

def setup():
global frame, n
frame = 1
n = 0
def draw():
global frame, n
frame += 1

if mousedown:
n += 1

background(0)

if n >= 240:
n = frame-frame

for i in range(0,20):
stroke(1-i/20.0)
strokewidth(2)
line(0, n-i*2, WIDTH, n-i*2)