Hi,

I have four dots oscillating horizontally. I am trying to get them to each oscillate a quarter wave out of phase with the next one.

Here's the basic sketch:

1. float x, angle;
   
   void setup() {
     size (600, 400);
   }
   void draw() {
     background (127);
     noStroke();
     fill(0);
   
     for (int i=1; i<5; i++) {
       x = sin(radians(angle))*50;
       ellipse (x + i*100, 100, 5, 5);
       angle -= PI/4;
     }
   }
   

Here's my attempt to get the dots to oscillate out of phase.

1. float x, angle, phi;
   
   void setup() {
     size (600, 400);
   }
   void draw() {
     background (127);
     noStroke();
     fill(0);
   
     for (int i=1; i<5; i++) {
       x = sin(radians(angle))*50;
       ellipse (x + i*100 + phi, 100, 5, 5);
       angle -= PI/4;
       phi += PI/8;
     }
   }
   

This gives weird behaviour.

Any help would be greatly appreciated.

Thanks,

Shane