getscrbox(3G)							 getscrbox(3G)

NAME    [Toc]    [Back]

     getscrbox - read back the current computed	screen bounding	box

C SPECIFICATION    [Toc]    [Back]

     void getscrbox(long *left,	long *right, long *bottom, long	*top)

PARAMETERS    [Toc]    [Back]

     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    [Toc]    [Back]

     getscrbox 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    [Toc]    [Back]

     scrbox

NOTE    [Toc]    [Back]

     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 getscrbox.  Use getgdesc to
     determine whether scrbox is supported.

     On	the IRIS-4D RealityEngine model	getscrbox returns the trivial
     rectangle defined by scrmask.


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