NAME
	  fglPixelZoom - specify the pixel zoom	factors


     FORTRAN SPECIFICATION
	  SUBROUTINE fglPixelZoom( REAL*4 xfactor,
				   REAL*4 yfactor )


     PARAMETERS
	  xfactor, yfactor Specify the x and y zoom factors for	pixel
			   write operations.

     DESCRIPTION
	  fglPixelZoom specifies values	for the	x and y	zoom factors.
	  During the execution of fglDrawPixels	or fglCopyPixels, if
	  (xr, yr) is the current raster position, and a given element
	  is in	the mth	row and	nth column of the pixel	rectangle,
	  then pixels whose centers are	in the rectangle with corners
	  at

		       (xr + n.xfactor,	yr + m.yfactor)

		    (xr	+ (n+1).xfactor, yr + (m+1).yfactor)

	  are candidates for replacement.  Any pixel whose center lies
	  on the bottom	or left	edge of	this rectangular region	is
	  also modified.

	  Pixel	zoom factors are not limited to	positive values.
	  Negative zoom	factors	reflect	the resulting image about the
	  current raster position.

     ERRORS
	  GL_INVALID_OPERATION is generated if fglPixelZoom is
	  executed between the execution of fglBegin and the
	  corresponding	execution of fglEnd.

     ASSOCIATED	GETS
	  fglGet with argument GL_ZOOM_X
	  fglGet with argument GL_ZOOM_Y

     SEE ALSO
	  fglCopyPixels, fglDrawPixels