hflip_glyph.ff

/*
 * Copyright (C) 2005, 2008 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 making second glyph from the first glyph by flipping

first_glyph = $1;
second_glyph = $2;
italic_angle = $3;
if ($argc > 4)
 y_origin = $4 # y coordinate of origin of rotation (usually [x|X] height / 2)
else
 y_origin = 0
endif
pi=4.0*ATan2(1.0,1.0)
tan_it = 1.0*Tan(italic_angle/100.0*pi/180.0)

#Print("Make copy from ",first_glyph," to ",second_glyph)

if (InFont(first_glyph))
 if ( WorthOutputting(first_glyph) )
  if (!InFont(second_glyph))
   new_glyph.ff(second_glyph)
  endif
   if ( WorthOutputting(second_glyph) )
    return
   endif

  Select(first_glyph)
  width = GlyphInfo("Width")
  Copy()
  Select(second_glyph)
  Paste()
  if ($argc > 4)
   x_origin = Round(width/2.0 - y_origin*tan_it)
   HFlip(x_origin)
  else
   HFlip()
  endif
  CorrectDirection()
  if (italic_angle != 0)
   if ($argc > 4)
    # Print(width, ", ", x_origin, ", ", y_origin)
    Skew(-2*italic_angle, 100, x_origin, y_origin)
   else
    Skew(-2*italic_angle,100)
   endif
  endif
  SetWidth(width)

  RoundToInt ()
  CanonicalStart()
  CanonicalContours()
  AutoHint ()

 endif
endif