public int left_x_value(int p_y){
  int result=Math.max(oct_lx,oct_ulx + p_y);
  return Math.max(result,oct_llx - p_y);
}

public int left_x_value ( int p_y ) { int result = Math . max ( oct_lx , oct_ulx + p_y ) ; return Math . max ( result , oct_llx - p_y ) ; }
computes the x value of the left boundary of this octagon at p_y
