procedure sbfint

Initialises the software buffer for crystal-plotting. It should be called just once per plot (buffer), after PGWINDOW but before any crystal-related routines.

Syntax
sbfint RGB,IC,IBMODE,IBUF,MAXBUF

Arguments
ARGUMENT    TYPE I/O DIMENSION DESCRIPTION
RGB:   R*4 I 3 The RGB values for the background.
IC:   I*4 I - The index for the background colour.
IBMODE:   I*4 I - Buffering mode for initialisation:
   1 = Ordinary, default.
   2 = Will want to save later.
   3 = Initialise from saved buffers.
IBUF:   I*4 I - Software buffer to be used (>=1).
MAXBUF:   I*4 O - Maximum number of buffers available.