663   position cent;  member in rectangle_object
669   position origin() { return cent; }  in origin()
670   position center() { return cent; }  in center()
671   position north() { return position(cent.x, cent.y + dim.y/2.0); }  in north()
672   position south() { return position(cent.x, cent.y - dim.y/2.0); }  in south()
673   position east() { return position(cent.x + dim.x/2.0, cent.y); }  in east()
674   position west() { return position(cent.x - dim.x/2.0, cent.y); }  in west()
675   position north_east() { return position(cent.x + dim.x/2.0, cent.y + dim.y/2.0); }  in north_east()
676   position north_west() { return position(cent.x - dim.x/2.0, cent.y + dim.y/2.0); }  in north_west()
677   position south_east() { return position(cent.x + dim.x/2.0, cent.y - dim.y/2.0); }  in south_east()
678   position south_west() { return position(cent.x - dim.x/2.0, cent.y - dim.y/2.0); }  in south_west()
691   p->encompass(cent - dim/2.0);  in update_bounding_box()
692   p->encompass(cent + dim/2.0);  in update_bounding_box()
697   cent += a;  in move_by()
749   return position(cent.x + dim.x/2.0 - CHOP_FACTOR*xrad,  in north_east()
750 		  cent.y + dim.y/2.0 - CHOP_FACTOR*yrad);  in north_east()
755   return position(cent.x - dim.x/2.0 + CHOP_FACTOR*xrad,  in north_west()
756 		  cent.y + dim.y/2.0 - CHOP_FACTOR*yrad);  in north_west()
761   return position(cent.x + dim.x/2.0 - CHOP_FACTOR*xrad,  in south_east()
762 		  cent.y - dim.y/2.0 + CHOP_FACTOR*yrad);  in south_east()
767   return position(cent.x - dim.x/2.0 + CHOP_FACTOR*xrad,  in south_west()
768 		  cent.y - dim.y/2.0 + CHOP_FACTOR*yrad);  in south_west()
779     vec[0] = cent + position(dim2.x, -dim2.y);  in print()
780     vec[1] = cent + position(dim2.x, dim2.y);  in print()
781     vec[2] = cent + position(-dim2.x, dim2.y);  in print()
782     vec[3] = cent + position(-dim2.x, -dim2.y);  in print()
787     out->rounded_box(cent, abs_dim, fabs(xrad), lt, fill);  in print()
929   cent += a;  in move_by()
1007   position north_east() { return position(cent.x + dim.x/(M_SQRT2*2.0),  in north_east()
1008 					  cent.y + dim.y/(M_SQRT2*2.0)); }  in north_east()
1009   position north_west() { return position(cent.x - dim.x/(M_SQRT2*2.0),  in north_west()
1010 					  cent.y + dim.y/(M_SQRT2*2.0)); }  in north_west()
1011   position south_east() { return position(cent.x + dim.x/(M_SQRT2*2.0),  in south_east()
1012 					  cent.y - dim.y/(M_SQRT2*2.0)); }  in south_east()
1013   position south_west() { return position(cent.x - dim.x/(M_SQRT2*2.0),  in south_west()
1014 					  cent.y - dim.y/(M_SQRT2*2.0)); }  in south_west()
1030   out->ellipse(cent, dim, lt, fill);  in print()
1079   out->circle(cent, dim.x/2.0, lt, fill);  in print()
1516   position cent;  member in arc_object
1520   position origin() { return cent; }  in origin()
1521   position center() { return cent; }  in center()
1539 : linear_object(s, e), clockwise(cw), cent(c)  in arc_object()
1547   cent += pos;  in move_by()
1554   position result(cent);  in north()
1561   position result(cent);  in south()
1568   position result(cent);  in east()
1575   position result(cent);  in west()
1582   position result(cent);  in north_east()
1590   position result(cent);  in north_west()
1598   position result(cent);  in south_east()
1606   position result(cent);  in south_west()
1631     b = strt - cent;  in print()
1633 		 b.x*sin(theta) + b.y*cos(theta)) + cent;  in print()
1646       b = strt - cent;  in print()
1648 		   b.x*sin(theta) + b.y*cos(theta)) + cent;  in print()
1658     b = en - cent;  in print()
1660                  b.x*sin(theta) + b.y*cos(theta)) + cent;  in print()
1673       b = en - cent;  in print()
1675                    b.x*sin(theta) + b.y*cos(theta)) + cent;  in print()
1681   out->arc(sp, cent, ep, lt);  in print()
1694   position start_offset = strt - cent;  in update_bounding_box()
1697   position end_offset = en  - cent;  in update_bounding_box()
1728     p->encompass(cent + offset);  in update_bounding_box()