getsb man page on IRIX

getsb man page on IRIX

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getsb(3G)							     getsb(3G)

NAME
     getsb - read back the current computed screen bounding box

FORTRAN SPECIFICATION
     subroutine getsb(left, right, bottom, top)
     integer*4 left, right, bottom, top

PARAMETERS
     left     returns the window coordinate of the left-most pixel drawn while
	      scrbox has been tracking.

     right    returns the window coordinate of the right-most pixel drawn
	      while scrbox has been tracking.

     bottom   returns the window coordinate of the lowest pixel drawn while
	      scrbox has been tracking.

     top      returns the window coordinate of the highest pixel drawn while
	      scrbox has been tracking.

DESCRIPTION
     getsb returns the current screen bounding box. scrbox is the computed
     bounding box of all geometry (points, lines, polygons) in screen-space.
     The hardware updates the four values each time geometry is drawn (while
     scrbox is tracking).

     If left is greater than right, or bottom is greater than top, nothing has
     been drawn since scrbox was reset.

SEE ALSO
     scrbox

NOTE
     This routine is available only in immediate mode.

     IRIS-4D G, GT, and GTX models, and the Personal Iris, do not support
     scrbox, and therefore do not support getsb.  Use getgde to determine
     whether scrbox is supported.

     On the IRIS-4D RealityEngine model getsb returns the trivial rectangle
     defined by scrmas.

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