[PD] GEM trigonometry clock

[Mathieu Bouchard]

On Wed, 12 Oct 2005, Alexandre Quessy wrote:

> > Why do you need [sin] and [cos] instead of [rotate] ?
> Well, depends if I can change the center of rotation of a geo.

conjugate it by a translation.

conjugating means you do one operation just before and the opposite one 
just after.

e.g.:

 |
[translateXYZ -4 6 -2]    forward translation
 |
[rotateXYZ 0 0 0.523598]  rotation
 |
[translateXYZ 4 -6 2]     backward translation
 |

warning: Pd sees +2 as a symbol and not a float, so if you write a 
positive number you must not type its sign.

Also note that in this particular case, the Z component of the translation 
has no effect (and could be anything as long as the two values are 
opposed), because the rotation has fixed points which are exactly the Z 
axis.

____________________________________________________________________
Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju
Freelance Digital Arts Engineer, Montréal QC Canada