Hello,

This might interest a a few people: I wanted to have frameRate-independant frequencies and be able to express these frequencies in Hertz.

This simple code does it. Not really magnificent but handy.

1. /*
2. 
   
3.  FRAMERATE-INDEPENDANT FREQUENCY
4.  I PREFER TO USE HERTZ  ALSO
5.  
6. */
7. import processing.opengl.*;
8. int rate  = 120 ; //set framerate here
9. float angle = 0.0 ;
10. float frequency = 0.1; // frequency in Hertz
11. void setup() {
12.   size (500, 500, OPENGL);
13.   frameRate(rate);
14. }
15. void draw() {
16.   translate(width/2, height/2, 0);
17.   angle = (( frequency * frameCount/(float(rate))) * TWO_PI) % TWO_PI; // ( frequency * frameCount/(float(rate)) is the most important part
18.   rotateZ(angle);
19.   rect(0, 0, 100, 10);
20. }