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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 math, inkex, simplestyle, simplepath, bezmisc
class Motion(inkex.Effect):
def __init__(self):
inkex.Effect.__init__(self)
self.OptionParser.add_option("-a", "--angle",
action="store", type="float",
dest="angle", default=45.0,
help="direction of the motion vector")
self.OptionParser.add_option("-m", "--magnitude",
action="store", type="float",
dest="magnitude", default=100.0,
help="magnitude of the motion vector")
def makeface(self,last,(cmd, params)):
a = []
a.append(['M',last[:]])
a.append([cmd, params[:]])
#translate path segment along vector
np = params[:]
defs = simplepath.pathdefs[cmd]
for i in range(defs[1]):
if defs[3][i] == 'x':
np[i] += self.vx
elif defs[3][i] == 'y':
np[i] += self.vy
a.append(['L',[np[-2],np[-1]]])
#reverse direction of path segment
np[-2:] = last[0]+self.vx,last[1]+self.vy
if cmd == 'C':
c1 = np[:2], np[2:4] = np[2:4], np[:2]
a.append([cmd,np[:]])
a.append(['Z',[]])
face = self.document.createElement('svg:path')
self.facegroup.appendChild(face)
face.setAttribute('d', simplepath.formatPath(a))
def effect(self):
self.vx = math.cos(math.radians(self.options.angle))*self.options.magnitude
self.vy = math.sin(math.radians(self.options.angle))*self.options.magnitude
for id, node in self.selected.iteritems():
if node.tagName == 'path':
group = self.document.createElement('svg:g')
self.facegroup = self.document.createElement('svg:g')
node.parentNode.appendChild(group)
group.appendChild(self.facegroup)
group.appendChild(node)
try:
t = node.attributes.getNamedItem('transform').value
group.setAttribute('transform', t)
node.attributes.getNamedItem('transform').value=""
except AttributeError:
pass
s = node.attributes.getNamedItem('style').value
self.facegroup.setAttribute('style', s)
p = simplepath.parsePath(node.attributes.getNamedItem('d').value)
for cmd,params in p:
tees = []
if cmd == 'C':
bez = (last,params[:2],params[2:4],params[-2:])
tees = [t for t in bezmisc.beziertatslope(bez,(self.vy,self.vx)) if 0<t<1]
tees.sort()
segments = []
if len(tees) == 0 and cmd in ['L','C']:
segments.append([cmd,params[:]])
elif len(tees) == 1:
one,two = bezmisc.beziersplitatt(bez,tees[0])
segments.append([cmd,list(one[1]+one[2]+one[3])])
segments.append([cmd,list(two[1]+two[2]+two[3])])
elif len(tees) == 2:
one,two = bezmisc.beziersplitatt(bez,tees[0])
two,three = bezmisc.beziersplitatt(two,tees[1])
segments.append([cmd,list(one[1]+one[2]+one[3])])
segments.append([cmd,list(two[1]+two[2]+two[3])])
segments.append([cmd,list(three[1]+three[2]+three[3])])
for seg in segments:
self.makeface(last,seg)
last = seg[1][-2:]
if cmd == 'M':
subPathStart = params[-2:]
if cmd == 'Z':
last = subPathStart
else:
last = params[-2:]
e = Motion()
e.affect()
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