Dear Hans, Thank you for the clear explanation. I thought “????” is appeared because of the font problem in my system. I did something wrong when I run the sample code, which didn’t work. Yes, it is working well in my code now. It makes the procedure of creating animation simpler. Thank you and thanks Wolfgang! Best regards, Dalyoung

2019. 5. 13. 오후 10:04, Hans Hagen 작성:

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Dear Wolfgang, I found the following code with a comment “code by Wolfgang” at https://adityam.github.io/context-blog/post/metapost-animation/ |\unprotect| |\installnamespace{MPanimationvariables}\unexpanded\def\startMPanimation{\dodoublegroupempty\meta_start_animation} \def\meta_start_animation#1%{\normalexpanded{\meta_start_animation_indeed{#1}}} \unexpanded\def\meta_start_animation_indeed#1#2#3\stopMPanimation{\doifsomething{#2}{\getparameters[\????MPanimationvariables#1:][#2]}%\setgvalue{\??mpgraphic animation:#1}{\meta_handle_use_graphic{#1}{n,t}{#3}}}\let\stopMPanimation\relax\unexpanded\def\useMPanimation%{\dosingleargument\use_meta_animation}\def\use_meta_animation[#1]#2%{\edef\c_MP_animation_frames{\getvalue{\????MPanimationvariables#2:n}}%\startanimation[#1]\dorecurse{\c_MP_animation_frames}{\expanded{\frame{\useMPgraphic{animation:#2}{n=\c_MP_animation_frames,t=\recurselevel}}}}\stopanimation}\protect| In the code, there are many “????”.(\????MPanimationvariables#1, {\??mpgraphic animation:#1}) I wonder it is correct or not. Would you please check it?

On 5/13/2019 2:14 PM, Jeong Dal wrote: these ?? ???? etc indicate (protected) namespaces so it's correct

Hans

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