[metapost] Animated graphics with Metapost?
akk64 at quick.cz
Sat Jun 11 11:37:00 CEST 2011
luigi scarso napsal(a):
> On Sat, Jun 11, 2011 at 8:18 AM, Dirk Laurie <dpl at sun.ac.za> wrote:
>> I'd like to make an incremental version of a drawing, i.e.
>> when displayed it starts of with just a line and gradually
>> adds more lines, points, color fill-ins etc, which one can
>> then display as an animation.
>> I've thought of this approach:
>> 1. Make a Metapost drawing of each stage, with the visible parts
>> in black and the not-yet visible parts white. This is the
>> same drawing each time with only the colors varying so that
>> there is no problem about superimposing frames of different size.
In that stage it is not necessary to draw whole image in white,
you can keep only its bounding box and then use it with every next
picture (see mpman.pdf, bbox macro, then use setbounds for every
Now you can define a sequence of pictures:
p2:=image(some add. drawing);
p<number>:=image(last part of drawing);
Finally you can produce a sequence of final PS pictures:
beginfig(0); %% the whole picture for the common bbox
for k=1 upto <number>: draw p[k]; endfor
for $=1 upto <number>:
beginfig($); for k=1 upto $: draw p[k]; endfor
setbounds currentpicture to bb;
>> 2. Import the Postscript files into GIMP and get it to make them
>> into an animated GIF.
There are many ways how to convert resulting PS files into one
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