question: public ShapeTileBox bounding_box ( int p_from_corner_no , int p_to_corner_no ) { int from_corner_no = Math . max ( p_from_corner_no , 0 ) ; int to_corner_no = Math . min ( p_to_corner_no , plaline_len ( - 2 ) ) ; double llx = Integer . MAX_VALUE ; double lly = llx ; double urx = Integer . MIN_VALUE ; double ury = urx ; for ( int i = from_corner_no ; i <= to_corner_no ; ++ i ) { PlaPointFloat curr_corner = corner_approx ( i ) ; llx = Math . min ( llx , curr_corner . v_x ) ; lly = Math . min ( lly , curr_corner . v_y ) ; urx = Math . max ( urx , curr_corner . v_x ) ; ury = Math . max ( ury , curr_corner . v_y ) ; } PlaPointInt lower_left = new PlaPointInt ( Math . floor ( llx ) , Math . floor ( lly ) ) ; PlaPointInt upper_right = new PlaPointInt ( Math . ceil ( urx ) , Math . ceil ( ury ) ) ; return new ShapeTileBox ( lower_left , upper_right ) ; }
target:  Returns the smallest box containing the intersection points from index p_from_corner_no to index p_to_corner_no of the lines of this polyline