import os

import cubicsuperpath

import inkex

import simplepath

import simpletransform

from ffgeom import *

inkex.localize()

try:

from subprocess import Popen, PIPE

bsubprocess = True

except:

bsubprocess = False

class Project(inkex.Effect):

def __init__(self):

inkex.Effect.__init__(self)

def effect(self):

if len(self.options.ids) < 2:

inkex.errormsg(_("This extension requires two selected paths. \nThe second path must be exactly four nodes long."))

exit()

#obj is selected second

scale = self.unittouu('1px') # convert to document units

obj = self.selected[self.options.ids[0]]

trafo = self.selected[self.options.ids[1]]

if obj.get(inkex.addNS('type','sodipodi')):

inkex.errormsg(_("The first selected object is of type '%s'.\nTry using the procedure Path->Object to Path." % obj.get(inkex.addNS('type','sodipodi'))))

exit()

if obj.tag == inkex.addNS('path','svg') or obj.tag == inkex.addNS('g','svg'):

if trafo.tag == inkex.addNS('path','svg'):

#distil trafo into four node points

mat = simpletransform.composeParents(trafo, [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]])

trafo = cubicsuperpath.parsePath(trafo.get('d'))

if len(trafo[0]) < 4:

inkex.errormsg(_("This extension requires that the second selected path be four nodes long."))

exit()

simpletransform.applyTransformToPath(mat, trafo)

trafo = [[Point(csp[1][0],csp[1][1]) for csp in subs] for subs in trafo][0][:4]

#vectors pointing away from the trafo origin

self.t1 = Segment(trafo[0],trafo[1])

self.t2 = Segment(trafo[1],trafo[2])

self.t3 = Segment(trafo[3],trafo[2])

self.t4 = Segment(trafo[0],trafo[3])

#query inkscape about the bounding box of obj

self.q = {'x':0,'y':0,'width':0,'height':0}

file = self.args[-1]

id = self.options.ids[0]

for query in self.q.keys():

if bsubprocess:

p = Popen('inkscape --query-%s --query-id=%s "%s"' % (query,id,file), shell=True, stdout=PIPE, stderr=PIPE)

rc = p.wait()

self.q[query] = scale*float(p.stdout.read())

err = p.stderr.read()

else:

f,err = os.popen3('inkscape --query-%s --query-id=%s "%s"' % (query,id,file))[1:]

self.q[query] = scale*float(f.read())

f.close()

err.close()

if obj.tag == inkex.addNS("path",'svg'):

self.process_path(obj)

if obj.tag == inkex.addNS("g",'svg'):

self.process_group(obj)

else:

if trafo.tag == inkex.addNS('g','svg'):

inkex.errormsg(_("The second selected object is a group, not a path.\nTry using the procedure Object->Ungroup."))

else:

inkex.errormsg(_("The second selected object is not a path.\nTry using the procedure Path->Object to Path."))

exit()

else:

inkex.errormsg(_("The first selected object is not a path.\nTry using the procedure Path->Object to Path."))

exit()

def process_group(self,group):

for node in group:

if node.tag == inkex.addNS('path','svg'):

self.process_path(node)

if node.tag == inkex.addNS('g','svg'):

self.process_group(node)

def process_path(self,path):

mat = simpletransform.composeParents(path, [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]])

d = path.get('d')

p = cubicsuperpath.parsePath(d)

simpletransform.applyTransformToPath(mat, p)

for subs in p:

for csp in subs:

csp[0] = self.trafopoint(csp[0])

csp[1] = self.trafopoint(csp[1])

csp[2] = self.trafopoint(csp[2])

mat = simpletransform.invertTransform(mat)

simpletransform.applyTransformToPath(mat, p)

path.set('d',cubicsuperpath.formatPath(p))

def trafopoint(self,(x,y)):

#Transform algorithm thanks to Jose Hevia (freon)

vector = Segment(Point(self.q['x'],self.q['y']),Point(x,y))

xratio = abs(vector.delta_x())/self.q['width']

yratio = abs(vector.delta_y())/self.q['height']

horz = Segment(self.t1.pointAtRatio(xratio),self.t3.pointAtRatio(xratio))

vert = Segment(self.t4.pointAtRatio(yratio),self.t2.pointAtRatio(yratio))

p = intersectSegments(vert,horz)

return [p['x'],p['y']]

if __name__ == '__main__':

e = Project()

e.affect()