Am 31.12.2025 um 12:38 schrieb Keith McKay:
Hi all,
The following example creates a unitcircle scaled to the \recurselevel
value on each MPpage.
\starttext
\dostepwiserecurse{1}{80}{1}{
\startMPpage
path a;
a := unitsquare xyscaled(80,80) ;
draw a;
draw unitcircle xyscaled(\recurselevel , \recurselevel);
\stopMPpage
}
\dostepwiserecurse{79}{2}{-1}{
\startMPpage
path a;
a := unitsquare xyscaled(80,80) ;
draw a;
draw unitcircle xyscaled(\recurselevel , \recurselevel);
\stopMPpage
}
\stoptext
If you run this and scan through pages, the circle starts at 1 and
increases to 80 and then decreases from 79 to 2. I use the pdf to create
a mp4 movie showing the circle increasing and decreasing when I replay
it as a loop. You can download the file here:
https://1drv.ms/v/c/de5fffb8e01e255b/
IQCLuQ9bYQovSIaOc7S5vc8_AQnAfqudRCjr_PC_pT6Rgx8?e=fuq9AS
However if my graphic is complicated, compilation time will increase by
quite a bit. So I was thinking that when the circle is decreasing I have
already calculated those MPpages as the circle was increasing so could I
not reuse those MPpages to create the following sequence of MPpages?
1, 2, 3, ... 78, 79, 80, 79, 78, ...3, 2
i.e I have reused the MPpages 79 to 2 which would loop in a movie when
played back.
\startMPinitializations
picture Circle[];
\stopMPinitializations
\startbuffer
\startMPpage
if unknown Circle[\recurselevel] :
Circle[\recurselevel] := image (
draw unitsquare scaled 80 ;
draw unitcircle scaled \recurselevel ;
) ;
fi ;
draw Circle[\recurselevel] ;
\stopMPpage
\stopbuffer
\starttext
\dostepwiserecurse{1}{80}{1}{\getbuffer}
\dostepwiserecurse{79}{2}{-1}{\getbuffer}
\stoptext
Wolfgang
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