dotty-svg.py

# Dot a Glyph
# Copyright 2019 Simon Cozens

# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:

# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.

# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.

# 3. Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from this
# software without specific prior written permission.

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
from beziers.path import BezierPath
from beziers.path.representations.fontparts import FontParts
from fontParts.world import *
from beziers.point import Point
from beziers.path.geometricshapes import Circle
import sys

dotradius   = 5
dotspacing  = 8
drawarrows  = True
arrowvector = Point(15,15)
fontpath    = "StrokeTest-Regular.ufo"
glyphname   = "A"
height      = 800
vmargin     = 200

font = OpenFont(fontpath)
paths = FontParts.fromFontpartsGlyph(font[glyphname])

print("""<?xml version="1.0" standalone="no"?>
<svg width="1000px" height="%spx" xmlns="http://www.w3.org/2000/svg">
<defs>
    <marker id="arrowhead" viewBox="0 0 10 10" refX="3" refY="5"
        markerWidth="6" markerHeight="6" orient="auto">
      <path d="M 0 0 L 10 5 L 0 10 z" />
    </marker>
  </defs>""" % (height + vmargin))
def pt2svg(pt): return "%i %i " % (pt.x, height-pt.y)
def path2svg(segs):
  svgpath = "M " + pt2svg(segs[0].start)
  for j in range(0,len(segs)):
    if segs[j].order == 2:
      svgpath = svgpath + " L "
    elif  segs[j].order == 3:
      svgpath = svgpath + " Q "
    elif  segs[j].order == 4:
      svgpath = svgpath + " C "
    svgpath += ", ".join([ pt2svg(x) for x in segs[j][1:] ])
  # if paths[i].closed: # It isn't.
    # svgpath += "Z"
  return svgpath

if drawarrows:
  for i in range(0,len(paths)):
    arrowP = paths[i].clone()
    arrowP.translate(arrowvector)
    arrowSeg, _ = (arrowP.asSegments())[0].splitAtTime(0.25)
    s = arrowSeg.start

    print('<text x="%s" y="%s">%i</text>' % (s.x+5.0,height-(s.y+5.0),1+i))
    print('<path d="%s" stroke="black" stroke-width="2" fill="transparent" marker-end="url(#arrowhead)"/>\n' % path2svg([arrowSeg]))

splitlist = []
for i in range(0,len(paths)):
  for j in range(i+1,len(paths)):
    one = paths[i]
    two = paths[j]
    for s1 in one.asSegments():
      for s2 in two.asSegments():
        for inter in s1.intersections(s2):
          splitlist.append((inter.seg1,inter.t1))
          splitlist.append((inter.seg2,inter.t2))

for path in paths:
  path.splitAtPoints(splitlist)

for i in range(0,len(paths)):
  segs = paths[i].asSegments()
  for s in segs:
    print('<path d="%s" fill="red"/>' % path2svg(Circle(dotradius, origin=s.start).asSegments()))
    if s.length > dotspacing*dotradius:
      closeEnough = int(s.length/(dotspacing*dotradius))
      samples = s.regularSample(closeEnough)
      for p in samples[1:]:
        print('<path d="%s"/>' % path2svg(Circle(dotradius, origin=p).asSegments()))
  print('<path d="%s" fill="red"/>' % path2svg(Circle(dotradius, origin=segs[-1].end).asSegments()))


  segs = paths[i].asSegments()
  print('<path d="%s" stroke="grey" stroke-width="1" fill="transparent"/>\n' % path2svg(segs))

print("</svg>\n")