animation using \startuseMPgraphic

[Jeong Dal <haksan@me.com>]

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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?
Or, is there a better way to do this?

Thank you for reading.

Best regards,

Dalyoung


\startuseMPgraphic{inversionPoint}{n}
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;
numeric radius, now, move;
pair A,B,C,P,Q;
path p,q;

radius := 2cm;
C := origin;
p := fullcircle scaled (2*radius);
z[1] = point 6 of p;
z[2] = point .8 of p;

q := (1.5*z1 - .5*z2) -- (-.5z1 + 1.5*z2);
%q := fullcircle scaled radius shifted (2cm, 1cm);
draw p;
draw q; 
%for i := 0 step 0.1 until 1:
    move := 0.1;
    now := move*\MPvar{n};
    P := point now along q;
    Q := findPointD(C, P, radius);
    drawdot P;
    drawdot Q withcolor .625red;
    dotlabel.lft(textext("P"),P);
    dotlabel.rt(textext("Q"),Q) withcolor .625red;
%endfor;
\stopuseMPgraphic

\usemodule[animation]
\setupinteraction[state=start]

\starttext
%\startplacefigure[]
    \startanimation[menu=yes]
    \dorecurse{10}{
    \useMPgraphic{inversionPoint}{n=\recurselevel}
    }
    \stopanimation
%\stopplacefigure
\stoptext



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