MetaPost Animations

MetaPost Animations

[Troy Henderson]

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I've created several animations using MetaPost/ConTeXt, and I have also
created a webpage with these animations.  The URL to the page is

http://www.tlhiv.org/animations/

Feedback is appreciated, and if there is a particular animation that you
would like to see included, let me know and I will attempt to code them up
in MetaPost, provide the source code, and include them on the webpage.

Troy Henderson

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Re: MetaPost Animations

[Otared Kavian]

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Dear Troy,

I just looked up your animations webpage: congratulations for the beautiful work you have done, and thanks for sharing.
I played a little bit with the hypocycloid source file you sent some time ago and found it useful for other situations as well.
Would it be possible to have the source files of the other examples you show on the webpage
	http://www.tlhiv.org/animations/

Also, if I may suggest something, an animation like the one for Riemann sums would be very intersting for illustrating the Lebesgue integrals in order to show to students what is going on.

Best wishes for the New Year, and best regards: OK

On 28 déc. 2012, at 20:41, Troy Henderson <thenders@gmail.com> wrote:

> I've created several animations using MetaPost/ConTeXt, and I have also created a webpage with these animations.  The URL to the page is
> 
> http://www.tlhiv.org/animations/
> 
> Feedback is appreciated, and if there is a particular animation that you would like to see included, let me know and I will attempt to code them up in MetaPost, provide the source code, and include them on the webpage.
> 
> Troy Henderson
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________


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Re: MetaPost Animations

[Hans Hagen]

On 12/28/2012 8:41 PM, Troy Henderson wrote:
> I've created several animations using MetaPost/ConTeXt, and I have also
> created a webpage with these animations.  The URL to the page is
>
> http://www.tlhiv.org/animations/
>
> Feedback is appreciated, and if there is a particular animation that you
> would like to see included, let me know and I will attempt to code them
> up in MetaPost, provide the source code, and include them on the webpage.

There are some animated gifs at:

http://en.wikipedia.org/wiki/B%C3%A9zier_curve

such curves are typical for mp so maybe they qualify.

Hans

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Re: MetaPost Animations

[Rogers, Michael K]

On 12/28/2012 8:41 PM, Troy Henderson wrote:
> I've created several animations using MetaPost/ConTeXt, and I have also
> created a webpage with these animations.  The URL to the page is
>
> http://www.tlhiv.org/animations/
>
> Feedback is appreciated, and if there is a particular animation that you
> would like to see included, let me know and I will attempt to code them
> up in MetaPost, provide the source code, and include them on the webpage.

Neat.  MP -> Flash seems to work well.

One thing, which you may know, gear teeth do not normally have rectangular profiles.  Nowadays, they are usually involutes of a circle and formerly were usually cycloids (so the gears don't slip against each other when they turn).  I don't have a reference, but google turned up http://www.cadquest.com/books/pdf/gears.pdf, which shows how to draw involute gears.

Are you using the animations, or some frames perhaps, in a ConTeXt document?  I usually use Mathematica for such animations, but it and its ilk are expensive, although there are other alternatives.  As I'm still learning MP/Lua/ConTeXt, I'm just interested in the ways others use the system.

Thanks for sharing.

Michael

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Re: MetaPost Animations

[Troy Henderson]

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>
>  One thing, which you may know, gear teeth do not normally have
> rectangular profiles.
>

This must be what Hans was talking about.


> Are you using the animations, or some frames perhaps, in a ConTeXt
> document?
>

Well, actually I'm using ConTeXt/MetaPost to generate each frame of the
animation "automagically".  The webpage will soon allow for downloading the
source for each ConTeXt document.  This generates a multi-page PDF where
each page of the PDF is a frame of the animation.  SWFtools (specifically,
pdf2swf) can then be used to convert the PDF to SWF.

Troy

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Re: MetaPost Animations

[Rogers, Michael K]

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On Dec 28, 2012, at 3:49 PM, Troy Henderson <thenders@gmail.com<mailto:thenders@gmail.com>> wrote:

One thing, which you may know, gear teeth do not normally have rectangular profiles.

This must be what Hans was talking about.

I thought Hans was talking about the animations of the construction of Bezier curves, which are pretty cool.

Thanks again for the response.

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Re: MetaPost Animations

[Troy Henderson]

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Are the gears more correct now?

Troy

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Re: MetaPost Animations

[Otared Kavian]

Dear Troy,

The gears are much better now. However, have a look at 
	http://fr.wikipedia.org/wiki/Fichier:Involute_wheel.gif
and
	http://fr.wikipedia.org/wiki/Engrenage

The animation for Gibbs is also very nice: thanks for sharing!
I tried the TeX file for your Gibbs phenomena animation: I could not get the same pictures as you show on your webpage. I get only one page out of 8, and the log file says several times:
unknown path q
! Improper `clip'.
<to be read again> 

Best regards: OK

On 29 déc. 2012, at 03:55, Troy Henderson <thenders@gmail.com> wrote:

> Are the gears more correct now?
> 
> Troy
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
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> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

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Re: MetaPost Animations

[Troy Henderson]

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>
> I tried the TeX file for your Gibbs phenomena animation: I could not get
> the same pictures as you show on your webpage.
>

I built the TeX file with ConTeXt.  I am using the ConTeXt that comes with
TeX Live 2012.

> context gibbs.tex

Troy

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Re: MetaPost Animations

[Hans Hagen]

On 12/29/2012 3:55 AM, Troy Henderson wrote:
> Are the gears more correct now?

Yes, it looks better this way. I don't know how deep the tooths need to 
be. Probably some complex formula is needed to determine that.

Hans

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Re: MetaPost Animations

[Mojca Miklavec]

On Sat, Dec 29, 2012 at 3:55 AM, Troy Henderson wrote:
> Are the gears more correct now?

Better that previously, but there is still room for improvement. The
teeth are too small among other things.

Bonus question: independent from the gears shape (assume that it stays
as it is), there is something fundamentally wrong with the animation.
What is that? ;)

Mojca
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Re: MetaPost Animations

[Peter Münster]

On Sat, Dec 29 2012, Mojca Miklavec wrote:

> there is something fundamentally wrong with the animation.

Not necessarily. Just imagine 2 motors: the 2 right gears are driving
the left one... ;)

-- 
           Peter
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Re: MetaPost Animations

[Tom Fossen]

Op 29-12-12 16:42, Mojca Miklavec schreef:
> On Sat, Dec 29, 2012 at 3:55 AM, Troy Henderson wrote:
>> Are the gears more correct now?
>
> [ ... ]
>
> Bonus question: independent from the gears shape (assume that it stays
> as it is), there is something fundamentally wrong with the animation.
> What is that? ;)
>


I think you draw our attention to the question: which one of the wheals 
is driving which one?

Tom


-- 
Tom Fossen
Amersfoort
Netherlands
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Re: MetaPost Animations

[Troy Henderson]

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>
> Bonus question: independent from the gears shape (assume that it stays
> as it is), there is something fundamentally wrong with the animation.
> What is that? ;)
>

When fixing the teeth, I broke the direction of one of the gears.  It's
repaired now.

Troy

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Re: MetaPost Animations

[Mojca Miklavec]

On Sun, Dec 30, 2012 at 3:57 AM, Troy Henderson wrote:
>> Bonus question: independent from the gears shape (assume that it stays
>> as it is), there is something fundamentally wrong with the animation.
>> What is that? ;)
>
>
> When fixing the teeth, I broke the direction of one of the gears.  It's
> repaired now.

Yes, it makes more sense now.

Very nice animations.

Mojca
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Re: MetaPost Animations

[Hans Hagen]

On 12/29/2012 2:02 AM, Rogers, Michael K wrote:

> I thought Hans was talking about the animations of the construction of
> Bezier curves, which are pretty cool.

the gears were mentioned in an off-list mail

Hans

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Re: [NTG-context] MetaPost Animations

[Jean-Michel Sarlat]

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Hello,

2012/12/28 Hans Hagen <pragma@wxs.nl>

> On 12/28/2012 8:41 PM, Troy Henderson wrote:
>
>> I've created several animations using MetaPost/ConTeXt, and I have also
>> created a webpage with these animations.  The URL to the page is
>>
>> http://www.tlhiv.org/**animations/ <http://www.tlhiv.org/animations/>
>>
>> Feedback is appreciated, and if there is a particular animation that you
>> would like to see included, let me know and I will attempt to code them
>> up in MetaPost, provide the source code, and include them on the webpage.
>>
>
> There are some animated gifs at:
>
> http://en.wikipedia.org/wiki/**B%C3%A9zier_curve<http://en.wikipedia.org/wiki/B%C3%A9zier_curve>
>
> such curves are typical for mp so maybe they qualify.
>
>
These images are very explicit, with metapost, it is a pleasure to get them
:)
Here is a first draft :
http://melusine.eu.org/syracuse/metapost/animations/bezier/
Enter in the directories and click the button "swf".

Jean-Michel Sarlat

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