Re: [Matplotlib-users] XKCD style graphs?

[Pierre H. <pie...@cr...>]

Hi Fernando,

Le 04/10/2012 09:16, Fernando Perez a écrit :
> This would make for an awesome couple of examples for the gallery, the
> mathematica solutions look really pretty cool:
>
> http://mathematica.stackexchange.com/questions/11350/xkcd-style-graphs
I've never used Mathematica so that it's pretty difficult for me to
understand the following lines of code which I guess do the main job of
distorting the image

xkcdDistort[p_] := Module[{r, ix, iy},
   r = ImagePad[Rasterize@p, 10, Padding -> White];
   {ix, iy} =
    Table[RandomImage[{-1, 1}, ImageDimensions@r]~ImageConvolve~
      GaussianMatrix[10], {2}];
   ImagePad[ImageTransformation[r,
     # + 15 {ImageValue[ix, #], ImageValue[iy, #]} &, DataRange ->
Full], -5]];


Is there somebody there that can describe this algorithm with words
(English or Python ;-)) ?

I feel like the key point is about adressing the rasterized plot image
"r" with some slightly randomized indices "ix" and "iy". However, I
really don't get the step that generates these indices.

Best,
Pierre