11 Responses to Post without words #3

1. Mister Globules says:

   October 30, 2011 at 12:10 am

   
   import Control.Monad
   import Data.Bits
   import Numeric
   import Text.Printf
       
   toGC n = (n `shiftR` 1) `xor` n
       
   base2 n = showIntAtBase 2 ("01" !!) n ""
       
   printGC w n = do
     let n' = toGC n
     printf "%0*s %0*s\n" w (base2 n) w (base2 n')
       
   main = forM_ [0..31 :: Int] $ printGC (5 :: Int)
   
   • Brent says:

     October 30, 2011 at 1:17 am

     =D
     • Mister Globules says:

       October 30, 2011 at 6:15 pm

       I indented the code by four spaces, as I thought you were using Markdown, but it looked terrible. Did you fix it up? If so, thanks!

       Also, I like the seasonal colours in the diagram.
       • Brent says:

         October 30, 2011 at 9:26 pm

         Yep, I fixed it up, no worries. =) You can just surround code with <pre><code> … </code></pre>.
2. Lucas Brown says:

   October 30, 2011 at 5:16 am

   The one on the left is just counting in binary. Is the one on the right a Gray code?
   • Brent says:

     October 30, 2011 at 10:49 am

     Right you are!
3. Anton Sherwood says:

   December 18, 2011 at 11:03 pm

   I made something pretty using Gray code:
   http://bendwavy.org/doodle/n2c-9.png
   http://bendwavy.org/doodle/n3c-9.png
   • Brent says:

     December 19, 2011 at 9:10 am

     Cool! Can you explain how you made it?
     • Anton Sherwood says:

       December 19, 2011 at 2:53 pm

       Yes.
     • Anton Sherwood says:

       December 19, 2011 at 3:06 pm

       For each pixel, put its x,y coordinates in Gray code; deal out the bits to the color-channels, in one of a large number of possible ways; convert the result from Gray code. Gray code is not essential to the concept, but makes it prettier.

       Thus for example the (Gray) coordinates’ bits might be
       X = G7 B7 R6 G5 B5 R4 G3 B3 R2 G1 B1 R0
       Y = R7 G6 B6 R5 G4 B4 R3 G2 B2 R1 G0 B0
       or in other words the (Gray) color bits are
       R = Y11 X9 Y8 X6 Y5 X3 Y2 X0
       G = X11 Y10 X8 Y7 X5 Y4 X2 Y1
       B = X10 Y9 X7 Y6 X4 Y3 X1 Y0

       (I forgot that I had already posted bigger versions on G+.)
       • Brent says:

         December 19, 2011 at 3:29 pm

         Ah, I see. Neat!

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