class Cell{
  boolean status;
  PVector loc;
  int  density;
  
  Cell(PVector _loc){
    loc=_loc.get();
  }
  
  void show(){
    noStroke();
    if (density==2){fill(255,255,0);}
    if (density==1){fill(0,0,255);}
    rect(loc.x,loc.y,size,size);
    
  }
}

void mouseDragged(){
    int x=(int)(mouseX*col/width);
    int y=(int)(mouseY*row/height);
    _density=0;
    if (x>1 && x<width/size && y>0 && y<height/size){
     if (mouseButton == LEFT){_density=2;}
     if (mouseButton == RIGHT){_density=1;}
             
        xygrid[x][y].status=true;
        xygrid[x][y].density=_density;
    
   }
}