Spot [] sp= new Spot [50]; //create an array of Spots called sp with 50 instances

void setup(){
  size(100,100);
  smooth();//anti alias
  noStroke();

  //construct a bunch of new Spots with random variables
  for(int i=0; i<50; i++){
    // constructs the object with 4 inputs: x, y, diameter, color
    sp[i]= new Spot( random(width) , random(height) , random(5,10), 
    color( int( random(255) ), int( random(255) ), int( random(255) ), int(random(255)) ) );
  }

}

void draw(){
  background(0);
  //for each spot
  for(int i=0; i<50; i++){
    sp[i].display();
    sp[i].update();
    //for each spot against all other spots
    for(int j=0; j<50; j++){
      sp[i].drawLines( sp[i].x, sp[i].y, sp[j].x, sp[j].y);
    }  
  }

}

class Spot {
  //global variables for the class
  float x, y;
  float diameter;
  color fColor;
  boolean goingRight=true; //start with all spots moving to the right

  //constructor
  Spot(float xpos, float ypos, float dia, color fillColor){
    x=xpos;
    y=ypos;
    diameter=dia;
    fColor=fillColor;
  }

  //functions
  void drawLines(float x1, float y1, float x2, float y2){
    float distance=dist(x1,y1,x2,y2); 
    if(distance<20){
      strokeWeight(.10);
      stroke(150);
      line(x1,y1,x2,y2);
    }  
  }

  void update(){
    if(x<0)  goingRight=true;
    if(goingRight==true) x=x+.2;

    if(x>width) goingRight=false; 
    if(goingRight==false) x=x-.2;  
  }

  void display(){
    fill(fColor);
    ellipse(x,y,diameter,diameter);
  }
  
}