On 18/05/2018 18:27, bartc wrote:
(BTW here's a port of that benchmark based on the Lua code:
https://pastebin.com/raw/ivDaKudX
And here's the payoff: I was able to use this version to port it to
Python. One which works better the the originals, as they wrote output
to the screen (/binary/ output) which I found difficult to capture into
an actual ppm file in order to test it worked.
The translation was straightforward, EXCEPT that I wasted an hour trying
to figure out to write /a single byte/ to a file. The following
eventually worked, using a binary file as a text one had Unicode
problems, but it's still hacky.
Note this version doesn't use any imports at all.
----------------------------------------------------------------
# For Python 3 (it'll work on Python 2 but give the wrong results)
n = 200 # adjust this for output size: n * n pixels
outfile = "test.ppm" # adjust for output file name
end = 0 # lines containing 'end' can be removed
def start():
m = 2/n
ba = 1<<(n%8+1)
bb = 1<<(8-n%8)
f = open(outfile,"wb")
f.write(b"P4\n")
f.write((str(n)+" "+str(n)+"\n").encode())
for y in range(n):
ci = y*m-1
b = 1
for x in range(n):
cr = x*m-1.5
zr = cr
zi = ci
zrq = cr*cr
ziq = ci*ci
b <<= 1
for i in range(1,50):
zi = zr*zi*2+ci
zr = zrq-ziq+cr
ziq = zi*zi
zrq = zr*zr
if zrq+ziq>4:
b +=1
break
end
end
if b>=256:
f.write(bytes([511-b]))
b = 1
end
end
if b != 1:
f.write(bytes([(ba-b)*bb]))
end
end
f.close()
end
start()
--
https://mail.python.org/mailman/listinfo/python-list
