Dear Wolfgang, Thank you for your help. It works fine. As you said, I need to use boundingbox for stable animation. Thank you again. Best regards, Dalyoung

2020. 4. 19. 오후 4:19, Wolfgang Schuster 작성:

Jeong Dal schrieb am 19.04.2020 um 07:08:

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Dear all, I am trying to make an animation using the animation module. But it draws 10 figures instead of creating animation. Is there anything I have to do more?

You have to put each animation step in a frame environment. I recommend also to set the boundingbox to the same size for each frame, otherwise your graphic jumps around.

When you use \recurselevel you have to use this:

\startanimation[menu=yes] \dorecurse{10} {\startexpanded \startframe \useMPgraphic{inversionPoint}{n=\recurselevel}% \stopframe \stopexpanded} \stopanimation

or use #1 to access the counter level and get rid of \startexpanded:

\startanimation[menu=yes] \dorecurse{10} {\startframe \useMPgraphic{inversionPoint}{n=#1}% \stopframe} \stopanimation

Wolfgang

On 4/19/2020 9:02 PM, Jeong Dal wrote:

Dear Wolfgang,

I’d like to ask you one more.

To make an animation, almost same graphics are drawn repeatedly. In my code, for example, The base figure(two circles, line, boundingbox) is fixed and only points are moved. But it draws the base figure every time and it is not inefficient.

In what sense? Runtime? Even moving the definitions doesn't really save cpu cycles. MP runtime is normally not the bottleneck in a run. \startMPextensions vardef findPointD(expr C, Q, r) = numeric dist, ang; pair X, Y; dist := r**2/sqrt((xpart Q - xpart C)**2 + (ypart Q - ypart C)**2); ang := angle(Q - C); Y := C + dir(ang)*dist; Y enddef; \stopMPextensions

Is there a way to draw the base figure once, and draw the points only at each frame? I guess you could stack them on top of a base background image but I wonder if it's worth the trouble.

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