# Copyright (c) P.J.Gawthrop, 1996.

###############################################################
## Version control history
###############################################################
## $Id$
## $Log$
## Revision 1.14  1996/12/21 19:47:53  peterg
## Changed \* to \\*
##
## Revision 1.13  1996/12/21 19:47:23  peterg
## Put back under VC
##
# Revision 1.12  1996/08/24  16:30:12  peter
# Fixed error in nonport_regexp.
#
## Revision 1.11  1996/08/19 10:48:57  peter

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# This (g)awk script reads a fig file in fig 3.1 format.
# It interprets the picture as: bonds, arrows and components
# as follows:
#
# Bonds are firm (not dashed etc) polylines with n line segments - 
#  fig represents this by  a firstline record where
#    field 1 = 2 (always 2)
#    field 2 = 1 (polyline)
#    field 3 = 0 (style is a firm line)
#    field 14 = 0 (no forward arrow)
#    field 15 = 0 (backward arrow) 
#    field 16 = Number of point in line (points=segments+1)
#  a data field starting with a tab followed by  points (x,y) cordinates
#
#
# Strokes are polylines with 1 line segment and and no arrow 
#  fig represents this by  a firstline record where
#    field 1 = 2 (always 2)
#    field 2 = 1 (polyline)
#    field 3 = 0 (style is a firm line)
#    field 14 = 0 (no forward arrow)
#    field 15 = 0 (backward arrow) 
#    field 16 = Number of point in line =2
#  a data field starting with a tab followed by 2 (x,y) cordinates
#
# Arrows are polylines with 1 line segment and an arrow 
#  fig represents this by  a firstline record where
#    field 1 = 2 (always 2)
#    field 2 = 1 (polyline)
#    field 3 = 0 (style is a firm line)
#    field 14 = 1 for a forward arrow  
#    field 15 = 1 for a backward arrow 
#  an additional data files










#  a data field starting with a tab followed by 2(x,y) cordinates
#
# Components appear in two files -- the fig file and the lbl file
# these two files are concatenated with the lbl file first
#  	The lbl file represents components by 3 fields
#		field  1 is the name
#		field  2 is the CR name

    x[name] = x_coord;
    y[name] = y_coord;
    info[name] =  fig_info();
    reps[name] = repetitions;
  }

}

#Euclidean length of a line between (first_x,first_y) and (second_x,second_y)
function line_length(first_x,first_y,second_x,second_y) {
  x_length = second_x-first_x;
  y_length = second_y-first_y;
  return sqrt( x_length*x_length +  y_length*y_length );
}

# Returns 1 if (bond) arrow at beginning of field or 2 if arrow at end of field
function arrow_end(first_x,first_y,second_x,second_y,penultimate_x,penultimate_y,last_x,last_y) {
  if ( line_length(first_x,first_y,second_x,second_y) < line_length(first_x,first_y,second_x,second_y) ) {
  return 1
  }
  else {
  return 2
  }
}

function process_bond() {

  arg_count++;
  if ( (arg_count-arrow)==1 ) 
    {

#Save up bond coords - no arrow and more segments than a stroke has.
# Allows for bent bonds - but just write out the relevant coordinates
      if ( (!arrow)&& (NF>2*stroke_coords+1) ) {
	i_bond++;
        a_end = arrow_end($2,$3,$4,$5,$(NF-3),$(NF-2),$(NF-1),$NF);
        if (a_end==1) {
	bonds[i_bond] = sprintf("%s %s %s %s %s %s", \
				$2, $3, $4, $5, $(NF-1), $(NF));
}
else {
	bonds[i_bond] = sprintf("%s %s %s %s %s %s", \
				$2, $3, $(NF-3),$(NF-2),$(NF-1),$NF);
}

      }
      
#Save up arrow coords 
      if ( (arrow)&&(NF==(2*arrow_coords+1)) ) {
	i_arrow++;
	arrows[i_arrow] = sprintf("%s %s %s %s",  $2, $3, $4, $5);
      }
      
#Save up stroke coords
      if ( (!arrow)&&(NF==(2*stroke_coords+1)) ) {