here is the code that I have. I am trying to get the pulsating circle to be evenly placed all over the screen rather than just pulsating from the origin. I think my problem is with translate but it could also be my understanding of and use of the sin function. Any help or suggestions are great.

float r= 300;
float angle=0.0;
float speed =.05;

void setup(){
  size(400,400);
  smooth();
 
 
 
}


void draw(){
 background(0);


angle += speed ;
float sinval= sin(angle);
float yoff= sinval * r;
 
 // translate(width/2 , height/2);
  scale(yoff/900 +.5);
  fill(random(200), 50, random(90));
  ellipse(0,0, 80,80);
 

   fill(random(20), 150, random(200));
  scale(yoff/900 +.5);
    //translate(160, 0);
  ellipse(160,0, 80,80);
 
    fill(random(20), 150, random(200));
  scale(yoff/900 +.5);
   // translate(60, 0);
  ellipse(80,0, 80,80);
 
}