Re: animation using \startuseMPgraphic

Re: animation using \startuseMPgraphic

[Jeong Dal]

Dear Hans,

Of course, it runs so fast that it is meaningless to shorten the runtime.
It is my old habit to check the algorithmic efficiency.

It is just my interest.

Thank you for your concern.

Best regards,

Dalyoung




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Re: animation using \startuseMPgraphic

[Hans Hagen]

On 4/20/2020 4:40 PM, Jeong Dal wrote:

> Of course, it runs so fast that it is meaningless to shorten the runtime.
> It is my old habit to check the algorithmic efficiency.

We share the same habit ... unfortunately there is not much performance 
to gain after all these years. Of course users are invited to tell me 
where they see a (real) bottleneck that doesn't make sense to them.

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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Re: animation using \startuseMPgraphic

[Jeong Dal]

Dear Hans,

I have not experienced a bottleneck when running ConTeXt.
It is stable and fast. 

I am satisfied with ConTeXt except there are many features and commands which are not explained.
Frankly speaking, I don’t need that much commands for my job. 
Also it is not the problem because there are many experts who willingly give the solutions in the list mail

I appreciate you and your team.

Best regards,

Dalyoung

> 2020. 4. 21. 오전 2:19, Hans Hagen <j.hagen@xs4all.nl> 작성:
> 
> On 4/20/2020 4:40 PM, Jeong Dal wrote:
> 
>> Of course, it runs so fast that it is meaningless to shorten the runtime.
>> It is my old habit to check the algorithmic efficiency.
> 
> We share the same habit ... unfortunately there is not much performance to gain after all these years. Of course users are invited to tell me where they see a (real) bottleneck that doesn't make sense to them.
> 
> Hans
> 
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>       tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------

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Re: animation using \startuseMPgraphic

[Jeong Dal]

Dear Aditya,

Thank you for your link.
It is good to see your nice code.

I’ll see how to apply \startMPanimation … \stopMPanimation to my sample.

Thank you again.

Best regards,

Dalyoung

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Re: animation using \startuseMPgraphic

[Hans Hagen]

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.

Hans

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Re: animation using \startuseMPgraphic

[Jeong Dal]

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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.

Is there a way to draw the base figure once, and draw the points only at each frame?

Thank you.
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; 

% end of base figure
% draw points

    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;
\stopuseMPgraphic


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Re: animation using \startuseMPgraphic

[Aditya Mahajan]

On Sun, 19 Apr 2020, Jeong Dal wrote:

> 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

Also see my simple wrapper around this:

https://adityam.github.io/context-blog/post/metapost-animation/

Aditya
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Re: animation using \startuseMPgraphic

[Jeong Dal]

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 <wolfgang.schuster.lists@gmail.com> 작성:
> 
> Jeong Dal schrieb am 19.04.2020 um 07:08:
>> 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

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Re: animation using \startuseMPgraphic

[Wolfgang Schuster]

Jeong Dal schrieb am 19.04.2020 um 07:08:
> 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
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animation using \startuseMPgraphic

[Jeong Dal]

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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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