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addnodes.py
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2006-09-06
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#!/usr/bin/env python
'''
Copyright (C) 2005 Aaron Spike, aaron@ekips.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
'''
import inkex, cubicsuperpath, simplestyle, copy, math, re, bezmisc
def numsegs(csp):
return sum([len(p)-1 for p in csp])
def tpoint((x1,y1), (x2,y2), t = 0.5):
return [x1+t*(x2-x1),y1+t*(y2-y1)]
def cspbezsplit(sp1, sp2, t = 0.5):
m1=tpoint(sp1[1],sp1[2],t)
m2=tpoint(sp1[2],sp2[0],t)
m3=tpoint(sp2[0],sp2[1],t)
m4=tpoint(m1,m2,t)
m5=tpoint(m2,m3,t)
m=tpoint(m4,m5,t)
return [[sp1[0][:],sp1[1][:],m1], [m4,m,m5], [m3,sp2[1][:],sp2[2][:]]]
def cspbezsplitatlength(sp1, sp2, l = 0.5, tolerance = 0.001):
bez = (sp1[1][:],sp1[2][:],sp2[0][:],sp2[1][:])
t = bezmisc.beziertatlength(bez, l, tolerance)
return cspbezsplit(sp1, sp2, t)
def cspseglength(sp1,sp2, tolerance = 0.001):
bez = (sp1[1][:],sp1[2][:],sp2[0][:],sp2[1][:])
return bezmisc.bezierlength(bez, tolerance)
def csplength(csp):
total = 0
lengths = []
for sp in csp:
lengths.append([])
for i in xrange(1,len(sp)):
l = cspseglength(sp[i-1],sp[i])
lengths[-1].append(l)
total += l
return lengths, total
def numlengths(csplen):
retval = 0
for sp in csplen:
for l in sp:
if l > 0:
retval += 1
return retval
class SplitIt(inkex.Effect):
def __init__(self):
inkex.Effect.__init__(self)
self.OptionParser.add_option("-m", "--max",
action="store", type="float",
dest="max", default=0.0,
help="maximum segment length")
def effect(self):
for id, node in self.selected.iteritems():
if node.tagName == 'path':
d = node.attributes.getNamedItem('d')
p = cubicsuperpath.parsePath(d.value)
#lens, total = csplength(p)
#avg = total/numlengths(lens)
#inkex.debug("average segment length: %s" % avg)
new = []
for sub in p:
new.append([sub[0][:]])
i = 1
while i <= len(sub)-1:
length = cspseglength(new[-1][-1], sub[i])
if length > self.options.max:
splits = math.ceil(length/self.options.max)
for s in xrange(int(splits),1,-1):
new[-1][-1], next, sub[i] = cspbezsplitatlength(new[-1][-1], sub[i], 1.0/s)
new[-1].append(next[:])
new[-1].append(sub[i])
i+=1
d.value = cubicsuperpath.formatPath(new)
e = SplitIt()
e.affect()