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#!/usr/bin/env python
# coding=utf-8
#
# Copyright (C) 2011 Felipe Correa da Silva Sanches <juca@members.fsf.org>
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
"""Convert known layer structures to svg font glyphs"""
import inkex
from inkex import SVGfont, FontFace, Glyph
class LayersToSvgFont(inkex.EffectExtension):
"""Convert layers to an svg font"""
def guideline_value(self, label, index):
for guide in self.svg.namedview.get_guides():
if guide.label == label:
return guide.point[index]
return 0
def flip_cordinate_system(self, path, emsize, baseline):
path = path.copy()
path.transform.add_scale(1, -1)
path.transform.add_translate(0, int(emsize) - int(baseline))
path.apply_transform()
return str(path.path)
def effect(self):
emsize = int(float(self.svg.get("width")))
baseline = self.guideline_value("baseline", 1)
ascender = self.guideline_value("ascender", 1) - baseline
caps = self.guideline_value("caps", 1) - baseline
xheight = self.guideline_value("xheight", 1) - baseline
descender = baseline - self.guideline_value("descender", 1)
font = self.svg.defs.get_or_create('svg:font', SVGfont)
font.set("horiz-adv-x", str(emsize))
font.set("horiz-origin-y", str(baseline))
fontface = font.get_or_create('font-face', FontFace)
fontface.set("font-family", "SVGFont")
fontface.set("units-per-em", str(emsize))
fontface.set("cap-height", str(caps))
fontface.set("x-height", str(xheight))
fontface.set("ascent", str(ascender))
fontface.set("descent", str(descender))
for group in self.svg.findall('svg:g'):
label = group.label
if "GlyphLayer-" in label:
unicode_char = label.split("GlyphLayer-")[1]
glyph = font.get_or_create("svg:glyph[@unicode='{}']".format(unicode_char), Glyph)
glyph.set("unicode", unicode_char)
############################
# Option 1:
# Using clone (svg:use) as childnode of svg:glyph
# use = glyph.get_or_create('svg:use', UseElement)
# use.set('xlink:href', "#"+group.get("id"))
# TODO: This code creates <use> nodes but they do not render on svg fonts dialog. why?
############################
# Option 2:
# Using svg:paths as childnodes of svg:glyph
# for p in group.findall('svg:path'):
# d = p.get("d")
# d = self.flip_cordinate_system(d, emsize, baseline)
# path = glyph.add(PathElement())
# path.set("d", d)
############################
# Option 3:
# Using curve description in d attribute of svg:glyph
path_d = ""
for path in group.findall('svg:path'):
path_d += " " + self.flip_cordinate_system(path, emsize, baseline)
glyph.set("d", path_d)
if __name__ == '__main__':
LayersToSvgFont().run()
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