Here's the animated (video) version.
http://www.youtube.com/watch?v=2_OZ-yKMd7g
How did you produce a video out of the PDF?
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How did you produce a video out of the PDF?
I wrote a BASH script to automate this process, but essentially it involves
converting each frame/page of the PDF to JPG and then combining the JPG
sequence into a MP4 movie.
The hypocycloid example has 191 frames, and so I did something like:
let
On 12/19/2012 07:09 PM, Troy Henderson wrote:
Is there a way to for ConTeXt to do basic arithmetic operations? For
example,
\calc{1+2} and have it return 3 or
\calc{1/3.8} and have it return 0.263157894736842 (or rounded)
Troy
http://wiki.contextgarden.net/Programming_in_LuaTeX#Examples
On 12/19/2012 7:09 PM, Troy Henderson wrote:
Is there a way to for ConTeXt to do basic arithmetic operations? For
example,
\calc{1+2} and have it return 3 or
\calc{1/3.8} and have it return 0.263157894736842 (or rounded)
\luaexpr{1+2}
On 12/19/2012 7:09 PM, Troy Henderson wrote:
\calc{1/3.8} and have it return 0.263157894736842 (or rounded)
\ctxcommand{format(@0.3f,1/3.8)}
@ as well as % ... just lua format but @ is more tex friendly
-
Do \luaexpr{1/3.8} and \ctxcommand{format(@0.3f,1/3.8)} return numbers or
strings? That is, I would like to use these results in a \if or \ifnum
command to exit a \doloop.
Troy
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Le 20 déc. 12 à 05:43, Troy Henderson a écrit :
Do \luaexpr{1/3.8} and \ctxcommand{format(@0.3f,1/3.8)} return
numbers or strings? That is, I would like to use these results in a
\if or \ifnum command to exit a \doloop.
Troy
Bonjour,
\ctxlua{context(type(\luaexpr{1/3.8}))} gives :
On 12/19/2012 7:43 PM, Troy Henderson wrote:
Do \luaexpr{1/3.8} and \ctxcommand{format(@0.3f,1/3.8)} return numbers
or strings? That is, I would like to use these results in a \if or
\ifnum command to exit a \doloop.
they return tokens i.e.
\ifnum\luaexpr{math.round(1/3.8)}1\relax
should
On 12/19/2012 8:19 PM, Roland Thiers wrote:
Le 20 déc. 12 à 05:43, Troy Henderson a écrit :
Do \luaexpr{1/3.8} and \ctxcommand{format(@0.3f,1/3.8)} return
numbers or strings? That is, I would like to use these results in a
\if or \ifnum command to exit a \doloop.
Troy
Bonjour,
···date: 2012-12-19, Wednesday···from: Troy Henderson···
Do \luaexpr{1/3.8} and \ctxcommand{format(@0.3f,1/3.8)} return numbers or
strings? That is, I would like to use these results in a \if or \ifnum
command to exit a \doloop.
Fwiw there are Lua-side conditionals available as well:
On 12/19/2012 9:13 PM, Troy Henderson wrote:
I got this to work. There's probably a better method though ;)
\edef\r{\luaexpr{1/3.8}}
\edef\q{1}\doloop{\ctxlua{commands.doifelse(math.abs(\q*\r -
math.floor(\q*\r+0.5))0.01)}{\exitloop}{\edef\q{\luaexpr{\q+1
Yes, you need to think more
In case anyone cares, here is the finished product which is a
frame-by-frame animation of a hypocycloid. The following code will produce
a 190 page PDF where each page is an individual frame of the animation.
Troy
\edef\r{\luaexpr{1/3.8}} % Radius of smaller circle (larger circle has
radius 1)
On 2012–12–19 Troy Henderson wrote:
In case anyone cares, here is the finished product which is a
frame-by-frame animation of a hypocycloid. The following code will produce
a 190 page PDF where each page is an individual frame of the animation.
[…]
Very nice work, indeed. It reminds me of
Very nice work, indeed. It reminds me of a drawing toy I had when I
was a kid. Thanks a lot for sharing.
Spirograph?
http://en.wikipedia.org/wiki/Spirograph
Troy
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Here's the animated (video) version.
http://www.youtube.com/watch?v=2_OZ-yKMd7g
Troy
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Wiki!
maillist : ntg-context@ntg.nl /
On 2012–12–19 Troy Henderson wrote:
Very nice work, indeed. It reminds me of a drawing toy I had when I
was a kid. Thanks a lot for sharing.
Spirograph?
http://en.wikipedia.org/wiki/Spirograph
Exactly, that's it.
Plenty of beautiful patterns with just small change in parameters.
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