class Leader {
 
 int posX, posY;
 
  float vecX, vecY;
 
 Leader() {
   posX = int(random(width,height));
   posY = int(random(width,height));
  vecX = .5;
  vecY = .5;
 } 
 
 void updatePosition(int xpos,int ypos) {
   //add some noise to the direction vector
   vecX = constrain( vecX + random( -1,1), -6, 6);
   vecY = constrain( vecY + random( -1,1), -6, 6);

   //if we're going to go off the screen, adjust the motion vector.
   if ((posX + vecX >= xpos) || (posX + vecX <= xpos-100)) vecX = -vecX;
   if ((posY + vecY >= ypos) || (posY + vecY <= ypos-100)) vecY = -vecY;

  //update position
   posX += vecX;
   posY += vecY;
   
 }
 
 void draw() {
   fill(255, 0,0);
  ellipse(posX, posY, 2, 2); 
 }
 
 int getPositionX() {return posX;}
  int getPositionY() {return posY;}

}