
plgspa: Get current subpage parameters 

DESCRIPTION:

	Gets the size of the current subpage in millimeters measured from the
	bottom left hand corner of the output device page or screen.  Can be
	used in conjunction with plsvpa for setting the size of a viewport in
	absolute coordinates (millimeters). 

SYNOPSIS:

plgspa(xmin, xmax, ymin, ymax)

ARGUMENTS:

    xmin (PLFLT *, output) :    Pointer to variable with position of left
        hand edge of subpage in millimeters. 

    xmax (PLFLT *, output) :    Pointer to variable with position of right
        hand edge of subpage in millimeters. 

    ymin (PLFLT *, output) :    Pointer to variable with position of
        bottom edge of subpage in millimeters. 

    ymax (PLFLT *, output) :    Pointer to variable with position of top
        edge of subpage in millimeters. 
