int nelements = 4;
MyElement [] e = new MyElement[nelements];

void setup(){
  for(int i=0; i<nelements; i++){
    e[i] = new MyElement(i, e);
    e[i].xspeed = random(1);
    e[i].yspeed = random(1);
  }  
}
void draw(){
  background(200);
  for(int i=0; i<nelements; i++){
    e[i].collide(); 
    e[i].move();   
  }
}

void mouseDragged(){
  for(int i=0; i<nelements; i++)
    if(dist(mouseX,mouseY,e[i].xpos,e[i].ypos)<20){
    e[i].xspeed = mouseX-pmouseX;
    e[i].yspeed = mouseY-pmouseY;
  }
}