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                               fg_lineclip
   Type
   int far fg_lineclip(fg_const_pbox_t clip, fg_const_pline_t line_in,
   fg_pline_t line_out);

   Description

   Input
   clip      The clipping box for the line line_in.
   line_in   The line that is to be tested against the clipping box.
   line_out  The output line that is a clipped version of line_in.

   Clipping is an area prone to problems with roundoff and  disconcerting
   behaviour. If the programmer is not satisfied with the performance  of
   the functions that call this routine (fg_drawlineclip, fg_drawbox, and
   fg_drawthickline)   the   programmer   may   supply   an   alternative
   implementation.

   Return Value
   Returns non-zero if one or more pixels of the line line_out lie inside
   the clipping box clip. Returns zero otherwise.