R_EDGE
#define EDGES (L_EDGE | R_EDGE | T_EDGE | B_EDGE)
#define CENTERED(t) (((t)->flags & (L_EDGE | R_EDGE | T_EDGE)) == 0)
flags |= R_EDGE;
v_edge = (tp->features & WSTPAD_SWAPSIDES) ? L_EDGE : R_EDGE;