bbox2(3g) — 4D1 2.0



     bbox2(3G)                                               bbox2(3G)



     NAME

          bbox2 - specifies bounding box and minimum pixel radius


     SPECIFICATION

          C         bbox2(xmin, ymin, x1, y1, x2, y2)

                    Screencoord xmin, ymin;

                    Coord x1, y1, x2, y2;


                    bbox2i(xmin, ymin, x1, y1, x2, y2)

                    Screencoord xmin, ymin;

                    Icoord x1, y1, x2, y2;


                    bbox2s(xmin, ymin, x1, y1, x2, y2)

                    Screencoord xmin, ymin;

                    Scoord x1, y1, x2, y2;




          FORTRAN   subroutine bbox2(xmin, ymin, x1, y1, x2, y2)

                    integer*4 xmin, ymin

                    real x1, y1, x2, y2


                    subroutine bbox2i(xmin, ymin, x1, y1, x2, y2)

                    integer*4 xmin, ymin, x1, y1, x2, y2


                    subroutine bbox2s(xmin, ymin, x1, y1, x2, y2)

                    integer*4 xmin, ymin

                    integer*2 x1, y1, x2, y2


     DESCRIPTION

          bbox2 controls the execution of routines in a Graphics

          Library object.  Its arguments are the coordinates of a

          bounding box in object space and minimum horizontal and

          vertical feature sizes in pixels.  bbox2 transforms the

          bounding box to screen coordinates and compares it with the

          viewport.  If the bounding box is completely outside the

          viewport, the system ignores routines between bbox2 and the

          end of the object.  Otherwise, the system compares the

          transformed bounding box with the minimum feature size.  If

          the bounding box is too small in both the x and y

          dimensions, the rest of the routines in the object are

          ignored.  Otherwise, interpretation of the object continues.


     SEE ALSO

          Programming Guide, Section 8.2, Using Objects











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