import sdl

SW = 320

SH = 240

pal = [ vec3(min(255,v), min(255,v*3/2), min(255,v*2)) for v in range(256)]

def julia(s,ca,cb):

print('julia....')

for y in range(SH):

for x in range(SW):

i = 0

a = x / SW

a *= 4.0 - 2.0

b=((float(y)/SH) * 4.0 - 2.0)

while i < 15 and (a*a)+(b*b)<4.0:

na=(a*a)-(b*b)+ca

nb=(2.0*a*b)+cb

a=na

b=nb

i = i +1

color = pal[ i*16 ]

sdl.draw( vec2(x,y), color )

sdl.flip()

for e in sdl.poll():

if e.type == "KEYUP":

return True

elif e.type == "MOUSE":

print('mouse x:', e.x)

print('mouse y:', e.y)

return False

I = [1]

def iterate():

print(I)

I[0] += 1

sdl.clear( vec3(0,0,0) )

x = I[0]

y = I[0]+1

ca=((float(x)/SW) * 2.0 - 1.0)

cb=((float(y)/SH) * 2.0 - 1.0)

julia(s,ca,cb)

sdl.flip()

sdl.delay(100)

def main():

print('enter main')

sdl.initialize()

sdl.window( vec2(SW,SH) )

while True: iterate()

main()