[Maxima] Draw an animated gif with black background

Richard Hennessy rvh2007 at comcast.net
Wed Dec 31 11:16:28 CST 2008


How can you send animated gif output to a file, I might as well learn how gnuplot works.  I have been putting it off.  If gnuplot 
can do animated gifs then that would be more powerful probably.

Rich


----- Original Message ----- 
From: "Richard Hennessy" <rvh2007 at comcast.net>
To: <biomates at telefonica.net>
Cc: "Maxima List" <maxima at math.utexas.edu>
Sent: Wednesday, December 31, 2008 11:46 AM
Subject: Re: [Maxima] Draw an animated gif with black background


Thanks, that worked but now I can't see any of the titles or labels.  Is there a way to change the default foreground color to white
or some hex code?

Rich

----- Original Message ----- 
From: "Mario Rodriguez" <biomates at telefonica.net>
To: "Richard Hennessy" <rvh2007 at comcast.net>
Cc: "Maxima List" <maxima at math.utexas.edu>
Sent: Wednesday, December 31, 2008 4:39 AM
Subject: Re: [Maxima] Draw an animated gif with black background


El mar, 30-12-2008 a las 18:34 -0500, Richard Hennessy escribió:
> Is there a way to change the background color of an "animated gif" output file from draw()?  I would like for my website to have
> white moving curves on a black or dark colored background.  Can this be done?  I currently have black or blue on white which I
> don't
> like.
>
> Rich
>

Commited draw with new file_bgcolor option.

Option file_bgcolor must be given a color in hex format; 'file_bgcolor =
black' is not allowed at this moment.

This option affects terminals gif, animated_gif, jpg and png. (I
couldn'n test jpg, since my current installation of gnuplot sends a
segmentation fault error message with this format).

Sample code:



set_draw_defaults(
   color      = yellow,
   line_width = 2 )$
draw(
   delay     = 100,
   file_name = "zzz",
   terminal  = 'animated_gif,
   file_bgcolor = "#000000",
   gr2d(explicit(x^2,x,-1,1)),
   gr2d(explicit(x^3,x,-1,1)),
   gr2d(explicit(x^4,x,-1,1)));



Hope you'll find this useful.

Mario


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