question: public void insert_trace ( Polyline p_polyline , int p_layer , int p_half_width , NetNosList p_net_no_arr , int p_clearance_class , ItemFixState p_fixed_state ) { BrdTracep new_trace = insert_trace_without_cleaning ( p_polyline , p_layer , p_half_width , p_net_no_arr , p_clearance_class , p_fixed_state ) ; if ( new_trace == null ) return ; new_trace . normalize ( changed_area . get_area ( p_layer ) ) ; }
target:  Inserts a trace into the board, whose geometry is described by a Polyline.  p_clearance_class is the index in the clearance_matix, which describes the required clearance restrictions to other items.