add_anchor_ext.ff

/*
 * Copyright (C) 2006 Andrey V. Panov 
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

# This fontforge script proposed for addition of anchor to glyph
#

class = $1
type = $2
position = $3  # same as for bounding box, i.e. 3 is y max, integer (1 or 3)
o_height = $4  # height of anchor mark, integer
tan_it = $5    # tangent of italic angle, real
if ($argc > 6) 
 delta_x = $6 
else
 delta_x = 0 
endif
if ($argc > 7) 
 ext_point = $7 # number of x coordinate from GlyphInfo("Xextrema",...)
else
 ext_point = 2 
endif

 if ( WorthOutputting() )
  bbox = GlyphInfo("BBox")
  if (position == 3)
   x_max = GlyphInfo("Xextrema", Floor(bbox[position]))
  else
   x_max = GlyphInfo("Xextrema", Ceil(bbox[position]))
  endif
#  Print(GlyphInfo("Name")," ",bbox,x_max," ",class," ",type," ",position," ",o_height)
  if(x_max[1] >= x_max[0])
   if (ext_point == 0 || ext_point == 1 )
    x_ext = x_max[ext_point]
   else
    x_ext = (x_max[1] - x_max[0])*0.5 + x_max[0]
   endif
   AddAnchorPoint(class, type, Round(x_ext + (bbox[position] - o_height)*tan_it + delta_x), o_height)
  endif
 endif