Name:         PGSTBG

Purpose:      set text background color index

Category:     GRAPHICS

File:         pgplot.src

Author:       T.J. Pearson

Use:          see description below.

Description:

            SUBROUTINE PGSTBG (TBCI)
            INTEGER  TBCI
      
       Set the Text Background Color Index for subsequent text. By default
       text does not obscure underlying graphics. If the text background
       color index is positive, however, text is opaque: the bounding box
       of the text is filled with the color specified by PGSTBG before
       drawing the text characters in the current color index set by PGSCI.
       Use color index 0 to erase underlying graphics before drawing text.
      
       Argument:
        TBCI   (input)  : the color index to be used for the background
                          for subsequent text plotting:
                            TBCI < 0  => transparent (default)
                            TBCI >= 0 => text will be drawn on an opaque
                          background with color index TBCI.

Updates:      Oct 16, 1998: JPT automatically extracted from source.