float inc = 0.0;//incremento de angulo 
float dim = 50; 
void setup() { 
  size(700, 700); 
  background(0,0,255); 
  smooth(); 
} 
void draw() { 
  background(0);
 
 //speed 
  inc += 0.004;
  
 //amount of rotation before reversal 
  float angle = sin(inc) /5.0 ; 
  
  translate(width/2,height/2); 
  for (int i = 0; i < 8; i++) {
    
 //size of tail 
   tail(10,-dim/2, 100, angle); 
   rotate(PI/4); 
  }
  
 //second circle 
  resetMatrix();
  translate(400,400); 
  for (int i = 0; i < 8; i++) {
    
 //size of tail 
   tail2(10,-dim/2, 40, angle); 
   rotate(PI/4); 
  } 
 
} 

//first circle
void tail(float x,float y, int units, float angle) { 
   
  translate(x/100, y/100); 
  for (int i = units; i > 8; i--) { 
   
  //line color
    stroke(150,0,56,100);
    
  //line size  
    line(width/5, height/250, 100, -4);
   
    
    translate(0, -3); 
    rotate(angle); 
     
 } 
 
}
//second circle
void tail2(float x,float y, int units, float angle) { 
   
  translate(x/100, y/100); 
 for (int i = units; i > 8; i--) { 
   
  //line color
    stroke(0,0,165,150);
    
  //line size  
    line(width/5, height/250, 100, -4);
   
    
    translate(0, -3); 
    rotate(angle); 
     
 } 
 
}