
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. 
