def match( p1, p2, a1, a2 ):
	x = 0
	y = 1
	# distances
	dp = [ p2[x]-p1[x], p2[y]-p1[y] ]
	da = [ a2[x]-a1[x], a2[y]-a1[y] ]
	# angles
	angle_p = math.atan2( dp[x], dp[y] )
	angle_a = math.atan2( da[x], da[y] )
	# radians
	#rp = math.sqrt( dp[x]*dp[x] + dp[y]*dp[y] )
	#ra = math.sqrt( da[x]*da[x] + da[y]*da[y] )
	rp = math.hypot( dp[x], dp[y] )
	ra = math.hypot( da[x], da[y] )
	# scale
	scale = ra / rp
	# transforms in the order they are applied
	t1 = simpletransform.parseTransform( "translate(%f,%f)"%(-p1[x],-p1[y]) )
	#t2 = simpletransform.parseTransform( "rotate(%f)"%(-angle_p) )
	#t3 = simpletransform.parseTransform( "scale(%f,%f)"%(scale,scale) )
	#t4 = simpletransform.parseTransform( "rotate(%f)"%angle_a )
	t2 = rotateTransform(-angle_p)
	t3 = scaleTransform( scale, scale )
	t4 = rotateTransform( angle_a )
	t5 = simpletransform.parseTransform( "translate(%f,%f)"%(a1[x],a1[y]) )
	# transforms in the order they are multiplied
	t = t5
	t = simpletransform.composeTransform( t, t4 )
	t = simpletransform.composeTransform( t, t3 )
	t = simpletransform.composeTransform( t, t2 )
	t = simpletransform.composeTransform( t, t1 )
	# return the combined transform
	return t

 def getHpgl(self):
     # dryRun to find edges
     groupmat = [[self.mirrorX * self.scaleX * self.viewBoxTransformX, 0.0, 0.0], [0.0, self.mirrorY * self.scaleY * self.viewBoxTransformY, 0.0]]
     groupmat = simpletransform.composeTransform(groupmat, simpletransform.parseTransform('rotate(' + self.options.orientation + ')'))
     self.vData = [['', -1.0, -1.0], ['', -1.0, -1.0], ['', -1.0, -1.0], ['', -1.0, -1.0]]
     self.processGroups(self.doc, groupmat)
     if self.divergenceX == 'False' or self.divergenceY == 'False' or self.sizeX == 'False' or self.sizeY == 'False':
         raise Exception('NO_PATHS')
     # live run
     self.dryRun = False
     if self.options.center:
         self.divergenceX += (self.sizeX - self.divergenceX) / 2
         self.divergenceY += (self.sizeY - self.divergenceY) / 2
     elif self.options.useToolOffset:
         self.options.offsetX += self.options.toolOffset
         self.options.offsetY += self.options.toolOffset
     groupmat = [[self.mirrorX * self.scaleX * self.viewBoxTransformX, 0.0, - self.divergenceX + self.options.offsetX],
         [0.0, self.mirrorY * self.scaleY * self.viewBoxTransformY, - self.divergenceY + self.options.offsetY]]
     groupmat = simpletransform.composeTransform(groupmat, simpletransform.parseTransform('rotate(' + self.options.orientation + ')'))
     self.vData = [['', -1.0, -1.0], ['', -1.0, -1.0], ['', -1.0, -1.0], ['', -1.0, -1.0]]
     # store first hpgl commands
     self.hpgl = 'IN;SP%d' % self.options.pen
     # add precut
     if self.options.useToolOffset and self.options.precut:
         self.processOffset('PU', 0, 0)
         self.processOffset('PD', 0, self.options.toolOffset * 8)
     # start conversion
     self.processGroups(self.doc, groupmat)
     # shift an empty node in in order to process last node in cache
     self.processOffset('PU', 0, 0)
     # add return to zero point
     self.hpgl += ';PU0,0;'
     return self.hpgl

    def _merge_transform(self, node, transform):
        """Propagate style and transform to remove inheritance
        Originally from
        https://github.com/nikitakit/svg2sif/blob/master/synfig_prepare.py#L370
        """

        # Compose the transformations
        if node.tag == addNS("svg", "svg") and node.get("viewBox"):
            vx, vy, vw, vh = [self._get_dimension(x)
                for x in node.get("viewBox").split()]
            dw = self._get_dimension(node.get("width", vw))
            dh = self._get_dimension(node.get("height", vh))
            t = ("translate(%f, %f) scale(%f, %f)" %
                (-vx, -vy, dw / vw, dh / vh))
            this_transform = simpletransform.parseTransform(
                t, transform)
            this_transform = simpletransform.parseTransform(
                node.get("transform"), this_transform)
            del node.attrib["viewBox"]
        else:
            this_transform = simpletransform.parseTransform(node.get(
                "transform"), transform)

        # Set the node's transform attrib
        node.set("transform",
                simpletransform.formatTransform(this_transform))

    def parse_gradient(self, node, d):
        if node.tag == addNS("linearGradient", "svg"):
            gradient_id = node.get("id", str(id(node)))
            x1 = float(node.get("x1", "0.0"))
            x2 = float(node.get("x2", "0.0"))
            y1 = float(node.get("y1", "0.0"))
            y2 = float(node.get("y2", "0.0"))

            mtx = simpletransform.parseTransform(node.get("gradientTransform"))

            link = node.get(addNS("href", "xlink"), "#")[1:]
            spread_method = node.get("spreadMethod", "pad")
            if link == "":
                stops = self.parse_stops(node, d)
                d.add_linear_gradient(gradient_id, [x1, y1], [x2, y2], mtx, stops=stops, spread_method=spread_method)
            else:
                d.add_linear_gradient(gradient_id, [x1, y1], [x2, y2], mtx, link=link, spread_method=spread_method)
        elif node.tag == addNS("radialGradient", "svg"):
            gradient_id = node.get("id", str(id(node)))
            cx = float(node.get("cx", "0.0"))
            cy = float(node.get("cy", "0.0"))
            r = float(node.get("r", "0.0"))
            fx = float(node.get("fx", "0.0"))
            fy = float(node.get("fy", "0.0"))

            mtx = simpletransform.parseTransform(node.get("gradientTransform"))

            link = node.get(addNS("href", "xlink"), "#")[1:]
            spread_method = node.get("spreadMethod", "pad")
            if link == "":
                stops = self.parse_stops(node, d)
                d.add_radial_gradient(gradient_id, [cx, cy], r, [fx, fy], mtx, stops=stops, spread_method=spread_method)
            else:
                d.add_radial_gradient(gradient_id, [cx, cy], r, [fx, fy], mtx, link=link, spread_method=spread_method)

    def effect(self):
        self.getselected()

        if self.selected:
            for id, shape in self.selected.items():
                self.recursiveFuseTransform(shape, parseTransform(None))
        else:
            self.recursiveFuseTransform(self.document.getroot(), parseTransform(None))

   def recursivelyTraverseSvg(self, nodeList=None, matCurrent=[[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]], parent_visibility='visible' ):
      """ Based on the Eggbot extension for Inkscape.
      Recursively traverse the svg file to plot out all the paths. Keeps track of the composite transformation that should be applied to each path.

      Handles path, group.
      Doesn't yet handle line, text, rect, polyline, polygon, circle, ellipse and use (clone) elements.
      Unhandled elements should be converted to paths in Inkscape.
      Probably want to avoid paths with holes inside.
      """

      if not nodeList:
         nodeList = self.svgRoot

         # get svg document width and height
         width, units_width = self.parseLengthAndUnits(nodeList.get("width"))
         height, units_height = self.parseLengthAndUnits(nodeList.get("height"))
         if units_width != units_height:
            print "Weird, units for SVG root document width and height differ..."
            print nodeList.get("width")
            print nodelist.get("height")
            sys.exit(1)

         # set initial viewbox from document root
         viewbox = nodeList.get("viewBox")
         print "Document size: %f x %f (%s)" % (width, height, units_width)
         if viewbox:
            vinfo = viewbox.strip().replace(',', ' ').split(' ')
            if (vinfo[2] != 0) and (vinfo[3] != 0):
               sx = width / float(vinfo[2])
               sy = height / float(vinfo[3])
               matCurrent = simpletransform.parseTransform("scale(%f, %f) translate(%f, %f)" % (sx, sy, -float(vinfo[0]), -float(vinfo[1])))

      print "Initial transformation matrix:", matCurrent


      for node in nodeList:

         # Ignore invisible nodes
         v = node.get('visibility', parent_visibility)
         if v == 'inherit':
            v = parent_visibility
         if v == 'hidden' or v == 'collapse':
            pass

         # first apply the current matrix transform to this node's transform
         matNew = simpletransform.composeTransform( matCurrent, simpletransform.parseTransform(node.get("transform")) )

         if node.tag in [self.svgQName("g"), "g"]:
            print "group tag - Might not be handled right!"
            self.recursivelyTraverseSvg( list(node), matNew, v )

         elif node.tag in [self.svgQName("path")]:
            self.plotPath( node, matNew )

         else:
            print "Other tag: '%s'" % node.tag

    def effect(self):
        object2path.ObjectToPath.effect(self)

        transformMatrix = [[1,0,0],[0,1,0]]
        dims = self.determine_dims(transformMatrix)

        [x,y,X,Y] = dims
        width = X - x
        height = Y - y

        # Longest side is vertical
        if width > height:
            scale = 480.0 / height
            if scale * width > 999.0:
                inkex.errormsg("Plot area is to large (%f > 999)." % scale*height)
                exit()
            transformMatrix = parseTransform('translate(%f,%f)' % (-x,-y))
            transformMatrix = composeTransform(parseTransform('rotate(-90)'), transformMatrix)
            transformMatrix = composeTransform(parseTransform('scale(%f,%f)' % (scale,scale)), transformMatrix)
        else:
            scale = 480.0 / width
            if scale * height > 999.0:
                inkex.errormsg("Plot area is to large (%f > 999)." % scale*height)
                exit()
            transformMatrix = parseTransform('translate(%f,%f)' % (-x,-y))
            transformMatrix = composeTransform(parseTransform('rotate(180)'), transformMatrix)
            transformMatrix = composeTransform(parseTransform('translate(%f,0)' % width), transformMatrix)
            transformMatrix = composeTransform(parseTransform('scale(%f,%f)' % (-scale,scale)), transformMatrix)
            transformMatrix = composeTransform(parseTransform('translate(480,0)'), transformMatrix)

        paths = []
        for [path, node] in self.processPaths(transformMatrix):
            color = (0, 0, 0)
            style = node.get('style')
            if style:
                style = simplestyle.parseStyle(style)
                if 'stroke' in style:
                    if style['stroke'] and style['stroke'] != 'none':
                        color = simplestyle.parseColor(style['stroke'])
            points = []
            for point in self.processPath(path):
                points.append(point)
            paths.append({'color':color, 'points':points})

        dims = self.determine_dims(transformMatrix)
        if self.options.debug:
            print >>sys.stderr, "VC1520 debug info"
            print >>sys.stderr, "-----------------"
            print >>sys.stderr, "plot area: minX:%d, minY:%d, maxX:%d, maxY:%d" % tuple(dims)
            print >>sys.stderr, "nr paths: %d" % len(paths)
            i = 0
            print >>sys.stderr, "path;color;points"
            for path in paths:
                print >>sys.stderr, "%d;%s;%d" % (i,self.find_color(path['color']),len(path['points']))
                i += 1
            for path in paths:
                print >>sys.stderr, path
        else:
            self.plot(paths, dims[1])

    def translateElement(self, node, x, y, relative=False):

        # Grab transform attribute if it exists.
        transform = node.get("transform", "")

        # Compute the nodes bounding box
        box = list(simpletransform.computeBBox([node]))

        pos_x = box[0]
        pos_y = box[2]

        # rotation center is not a breeze to calculate from the matrix, so thanks inkscape ;)
        origin_x = float(node.get(inkex.addNS("transform-center-x", "inkscape"), 0))
        origin_y = float(node.get(inkex.addNS("transform-center-y", "inkscape"), 0))
        origin_x = origin_x + (box[1] / 2)
        origin_y = (origin_y * -1) + (box[3] / 2)

        if transform == "":
            # If there is no transform attribute on the node we add one
            node.attrib["transform"] = ""

        # simpletransform returns a multi dim array of matrix values
        transform = simpletransform.parseTransform(transform)

        transformObject = self.normalizeMatrix(transform)
        inkex.debug(transformObject)
        # offset_x = (transform[0][2]-pos_x)
        # offset_y = (transform[1][2]-pos_y)
        offset_x = pos_x * -1
        offset_y = pos_y * -1

        inkex.debug([offset_x, offset_y])

        transform = simpletransform.parseTransform(
            ("translate(" + str(offset_x) + " " + str(offset_y) + ")"), transform
        )

        transformObject = self.normalizeMatrix(transform)
        inkex.debug(transformObject)

        inkex.debug(transform)

        if relative == False:
            matrix = simpletransform.formatTransform(transform)
            node.set("transform", matrix)
            inkex.debug(matrix)
        else:
            simpletransform.applyTransformToNode(transform, node)

 def _merge_clippath(self, node, clippathurl):
     if (clippathurl):
         node_transform = simpletransform.parseTransform(
             node.get("transform"))
         if (node_transform):
             # Clip-paths on nodes with a transform have the transform
             # applied to the clipPath as well, which we don't want.  So, we
             # create new clipPath element with references to all existing
             # clippath subelements, but with the inverse transform applied
             inverse_node_transform = simpletransform.formatTransform(
                 self._invert_transform(node_transform))
             new_clippath = inkex.etree.SubElement(
                 self.xpathSingle('//svg:defs'), 'clipPath',
                 {'clipPathUnits': 'userSpaceOnUse',
                  'id': self.uniqueId("clipPath")})
             clippath = self.getElementById(clippathurl[5:-1])
             for c in (clippath.iterchildren()):
                 inkex.etree.SubElement(
                     new_clippath, 'use',
                     {inkex.addNS('href', 'xlink'): '#' + c.get("id"),
                      'transform': inverse_node_transform,
                      'id': self.uniqueId("use")})
             # Set the clippathurl to be the one with the inverse transform
             clippathurl = "url(#" + new_clippath.get("id") + ")"
         # Reference the parent clip-path to keep clipping intersection
         # Find end of clip-path chain and add reference there
         node_clippathurl = node.get("clip-path")
         while (node_clippathurl):
             node = self.getElementById(node_clippathurl[5:-1])
             node_clippathurl = node.get("clip-path")
         node.set("clip-path", clippathurl)

 def process_clone(self, node):
     trans = node.get('transform')
     x = node.get('x')
     y = node.get('y')
     mat = [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]]
     if trans:
         mat = simpletransform.composeTransform(mat, simpletransform.parseTransform(trans))
     if x:
         mat = simpletransform.composeTransform(mat, [[1.0, 0.0, float(x)], [0.0, 1.0, 0.0]])
     if y:
         mat = simpletransform.composeTransform(mat, [[1.0, 0.0, 0.0], [0.0, 1.0, float(y)]])
     # push transform
     if trans or x or y:
         self.groupmat.append(simpletransform.composeTransform(self.groupmat[-1], mat))
     # get referenced node
     refid = node.get(inkex.addNS('href','xlink'))
     refnode = self.getElementById(refid[1:])
     if refnode is not None:
         if refnode.tag == inkex.addNS('g','svg'):
             self.process_group(refnode)
         elif refnode.tag == inkex.addNS('use', 'svg'):
             self.process_clone(refnode)
         else:
             self.process_shape(refnode, self.groupmat[-1])
     # pop transform
     if trans or x or y:
         self.groupmat.pop()

 def process_group(self, group):
     if group.get(inkex.addNS('groupmode', 'inkscape')) == 'layer':
         style = group.get('style')
         if style:
             style = simplestyle.parseStyle(style)
             if style.has_key('display'):
                 if style['display'] == 'none' and self.options.layer_option and self.options.layer_option=='visible':
                     return
         layer = group.get(inkex.addNS('label', 'inkscape'))
         if self.options.layer_name and self.options.layer_option and self.options.layer_option=='name' and not layer.lower() in self.options.layer_name:
             return
           
         layer = layer.replace(' ', '_')
         if layer in self.layers:
             self.layer = layer
     trans = group.get('transform')
     if trans:
         self.groupmat.append(simpletransform.composeTransform(self.groupmat[-1], simpletransform.parseTransform(trans)))
     for node in group:
         if node.tag == inkex.addNS('g','svg'):
             self.process_group(node)
         elif node.tag == inkex.addNS('use', 'svg'):
             self.process_clone(node)
         else:
             self.process_shape(node, self.groupmat[-1])
     if trans:
         self.groupmat.pop()

 def mergeTransform(self, doc, matrix):
     # get and merge two matrixes into one
     trans = doc.get('transform')
     if trans:
         return simpletransform.composeTransform(matrix, simpletransform.parseTransform(trans))
     else:
         return matrix

    def effect(self):
        pts = []
        for node in self.selected.itervalues():
            if node.tag == inkex.addNS('path','svg'):
                guide = node
                pts = get_n_points_from_path(node, 2)

        if len(pts) == 2:
    
            (x0, y0), (x1, y1) = pts
            theta = atan2(y1-y0, x1-x0)*180./pi
            length = ((x1-x0)**2 + (y1-y0)**2)**0.5
            
            label = inkex.etree.SubElement(self.current_layer, 'g')
            labeltag = inkex.etree.SubElement(label, 'g')
            
            
            if theta <= -90.0 or theta > 90.0:
                text, tw, th = self.make_text(anchor='end')
                applyTransformToNode(parseTransform('rotate(180.0)'), text)
            else:
                text, tw, th = self.make_text(anchor='start')
            
            fs = float(self.options.font_size)
            kh = 1.05
            h = kh*fs
            pad = (h - fs)*0.5 + 0.04*tw
            w = tw + pad*2
            x = -pad + 0.07*fs
            y = -0.5*h

            box = self.make_box(x, y, w, h, r=0.25*min(w, h))

            labeltag.append(box)
            labeltag.append(text)

            transform = 'translate(%f, 0.0)'% (length,)
            applyTransformToNode(parseTransform(transform), labeltag)
            
            leader = self.make_double_line(length+x)
            label.append(leader)

            transform = 'translate(%f, %f) rotate(%f)'%(x0, y0, theta)
            applyTransformToNode(parseTransform(transform), label)
        
            guide.getparent().remove(guide)

 def get_transform(self):
     data = self.node.get("transform")
     if not data:
         return
     matrix = parseTransform(data)
     m11, m21, dx = matrix[0]
     m12, m22, dy = matrix[1]
     return m11, m12, m21, m22, dx, dy

    def recursiveFuseTransform(self, node, transf=[[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]]):
        transf = composeTransform(transf, parseTransform(node.get("transform", None)))

        if 'transform' in node.attrib:
            del node.attrib['transform']

        if 'style' in node.attrib:
            style = node.attrib.get('style')
            style = simplestyle.parseStyle(style)
            update = False

            if 'stroke-width' in style:
                try:
                    stroke_width = self.unittouu(style.get('stroke-width').strip())
                    # pixelsnap ext assumes scaling is similar in x and y
                    # and uses the x scale...
                    # let's try to be a bit smarter
                    stroke_width *= math.sqrt(transf[0][0]**2 + transf[1][1]**2)
                    style['stroke-width'] = str(stroke_width)
                    update = True
                except AttributeError:
                    pass

            if update:
                style = simplestyle.formatStyle(style)
                node.attrib['style'] = style

        node = ApplyTransform.objectToPath(node)

        if 'd' in node.attrib:
            d = node.get('d')
            p = cubicsuperpath.parsePath(d)
            applyTransformToPath(transf, p)
            node.set('d', cubicsuperpath.formatPath(p))

        elif node.tag in [inkex.addNS('polygon', 'svg'),
                          inkex.addNS('polyline', 'svg')]:
            points = node.get('points')
            points = points.strip().split(' ')
            for k,p in enumerate(points):
                if ',' in p:
                    p = p.split(',')
                    p = [float(p[0]),float(p[1])]
                    applyTransformToPoint(transf, p)
                    p = [str(p[0]),str(p[1])]
                    p = ','.join(p)
                    points[k] = p
            points = ' '.join(points)
            node.set('points', points)

        elif node.tag in [inkex.addNS('rect', 'svg'),
                          inkex.addNS('text', 'svg'),
                          inkex.addNS('image', 'svg'),
                          inkex.addNS('use', 'svg')]:
            node.set('transform', formatTransform(transf))

        for child in node.getchildren():
            self.recursiveFuseTransform(child, transf)

    def effect(self):
        """ This method is called first, and sets up the self.commands list for later output. """
        svg = self.document.getroot()
        # find document width and height, used to scale down
        self.doc_width = inkex.unittouu(svg.get('width'))
        self.doc_height = inkex.unittouu(svg.get('height'))

        # add header
        self.commands.append("^DF;")
        self.commands.append("! 1;")
        self.commands.append("H;")
        self.commands.append("@ %d %d;" % (self.options.z_down, self.options.z_up))
        self.commands.append("V {0};F {0};\n".format(self.options.feed_rate_moving))
        self.commands.append("Z 0 0 %d;" % self.options.z_up)

        # mostly borrowed from hgpl_output.py
        lastX = 0
        lastY = 0

        # find paths in layers
        i = 0
        layerPath = '//svg:g[@inkscape:groupmode="layer"]'
        for layer in svg.xpath(layerPath, namespaces=inkex.NSS):
            i += 1

            nodePath = ('//svg:g[@inkscape:groupmode="layer"][%d]/descendant::svg:path') % i
            for node in svg.xpath(nodePath, namespaces=inkex.NSS):
                # these next lines added from this patch to fix the transformation issues - http://launchpadlibrarian.net/36269154/hpgl_output.py.patch
                # possibly also want to try this code: https://bugs.launchpad.net/inkscape/+bug/600472/+attachment/1475310/+files/hpgl_output.py
                transforms = node.xpath("./ancestor-or-self::svg:*[@transform]",namespaces=inkex.NSS)
                matrix = [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]]
                for parenttransform in transforms:
                    newmatrix = simpletransform.parseTransform(parenttransform.get("transform"))
                    matrix = simpletransform.composeTransform(matrix, newmatrix)

                d = node.get('d')
                if len(simplepath.parsePath(d)):
                    p = cubicsuperpath.parsePath(d)
                    simpletransform.applyTransformToPath(matrix, p) # this line is also from the transform-fixing patch mentioned above
                    cspsubdiv.cspsubdiv(p, self.options.flat)
                    for sp in p:
                        first = True
                        for csp in sp:
                            if first:
                                x, y = self.conv_coords(csp[1][0], self.doc_height - csp[1][1])
                                self.commands.append("Z %d %d %d;" % (x, y, self.options.z_up))
                                self.commands.append("V {0};F {0};".format(self.options.feed_rate_cutting))
                            first = False
                            x, y = self.conv_coords(csp[1][0], self.doc_height - csp[1][1])
                            self.commands.append("Z %d %d %d;" % (x, y, self.options.z_down))
                            lastX = x
                            lastY = y
                        self.commands.append("V {0};F {0};".format(self.options.feed_rate_moving))
                        self.commands.append("Z %d %d %d;" % (lastX, lastY, self.options.z_up))

        self.commands.append("Z 0 0 %d;" % self.options.z_up)
        self.commands.append("H;")

    def parseGroup(self,node,parent):
        #inkex.debug(self.debug_tab + 'Parsing group' + node.get('id'))
        self.debug_tab += '    '
        matrix_list = []
        self.parsing_context = 'g'
        transform = node.get('transform','')
        id = node.get('id')

        if(transform!=''):
            transform = simpletransform.parseTransform(node.get('transform',''))
            transform = self.matrixToList(transform)
            transform = self.normalizeMatrix(transform)

        label = str(node.get(inkex.addNS('label', 'inkscape'),''))

        elements = node.xpath('./*',namespaces=inkex.NSS)

        #box = simpletransform.computeBBox(elements)
        #box = list(box) if box != None else []

        box =list(simpletransform.computeBBox([node]))

        box[1] = (box[1]-box[0])
        box[3] = (box[3]-box[2])

        origin_x = float(node.get(inkex.addNS('transform-center-x', 'inkscape'),0))
        origin_y = float(node.get(inkex.addNS('transform-center-y', 'inkscape'),0))
        origin_x = origin_x + ( box[1] / 2)
        origin_y = (origin_y * -1) + ( box[3] / 2)

        group = {
            'id':id,
            'name':label,
            'label':label,
            'svg':'g',
            'transform':transform,
            'origin':{
                'x':origin_x,
                'y':origin_y,
            },
            'box':box,
            'elements':[]
        }

        parent.append(group)

        self.parse_stack.append(group)

        #inkex.debug('Loop through all grouped elements')

        for child in elements:
            self.parseElement(child,group["elements"])

        self.debug_tab = self.debug_tab[:-4]

        self.parsing_context = ''
        self.parse_stack.pop()

	def get_transforms(self,g):
		root = self.document.getroot()
		trans = []
		while (g!=root):
			if 'transform' in g.keys():
				t = g.get('transform')
				t = simpletransform.parseTransform(t)
				trans = simpletransform.composeTransform(t,trans) if trans != [] else t
			g=g.getparent()
		return trans 

	def effect(self):
		for id, node in self.selected.iteritems():
			if node.tag == '{http://www.w3.org/2000/svg}path':
				path=node
				break
		else:
			sys.stderr.write('Need one path selected\n')
			return

		pts = cubicsuperpath.parsePath(path.get('d'))

		if 'transform' in path.keys():
			trans = path.get('transform')
			trans = simpletransform.parseTransform(trans)
			simpletransform.applyTransformToPath(trans, pts[i])

		gtext = inkex.etree.SubElement(path.xpath('..')[0], inkex.addNS('g','svg'), {} )
		gdots = inkex.etree.SubElement(path.xpath('..')[0], inkex.addNS('g','svg'), {} )

		size = 10
		if 'style' in path.attrib:
			style=path.get('style')
			if style!='':
				styles=style.split(';')
            			for i in range(len(styles)):
					if styles[i].startswith('stroke-width'):
						if ( styles[i].endswith('px') or styles[i].endswith('cm') ) :
							size=float(styles[i][len('stroke-width:'):-2])*2
						else:
							size=float(styles[i][len('stroke-width:'):])*2
#		if len(pts[0])>2:
#			size = math.sqrt(math.pow(pts[0][0][0][0]-pts[0][1][0][0],2)+math.pow(pts[0][0][0][1]-pts[0][1][0][1],2))/10

		it = 0
		for sub in pts:
			for p in sub:
				if it == 0:
					style = { 'stroke': 'none', 'fill': 'black' }
					x0 = p[0][0]
					y0 = p[0][1]
					circ_attribs = {'id':'pt0','style':simplestyle.formatStyle(style),'cx':str(x0), 'cy':str(y0),'r':str(size)}
					circle = inkex.etree.SubElement(gdots, inkex.addNS('circle','svg'), circ_attribs )
				else:
					clone_attribs = { 'x':'0', 'y':'0', 'transform':'translate(%f,%f)' % (p[0][0]-x0,p[0][1]-y0) }
					clone = inkex.etree.SubElement(gdots, inkex.addNS('use','svg'), clone_attribs )
					xlink = inkex.addNS('href','xlink')
					clone.set(xlink, '#pt0')

				text_style = { 'font-size':'%dpx' % (size*2.4), 'fill':'black', 'font-family':'DejaVu Sans', 'text-anchor':'middle' }
				text_attribs = { 'x':str(p[0][0]), 'y':str(p[0][1]-size*1.8), 'style':simplestyle.formatStyle(text_style) }
				text = inkex.etree.SubElement(gtext, inkex.addNS('text','svg'), text_attribs)
				tspan = inkex.etree.SubElement(text , 'tspan', {inkex.addNS('role','sodipodi'): 'line'})
            			tspan.text = '%d' % ( it+1 )

				it+=1

    def effect(self):
        paths = []
        for id, node in self.selected.iteritems():
            if node.tag == '{http://www.w3.org/2000/svg}path':
                paths.append(node)
                if len(paths) == 2:
                    break
        else:
            sys.stderr.write('Need 2 paths selected\n')
            return


        pts = [cubicsuperpath.parsePath(paths[i].get('d'))
               for i in (0,1)]

        for i in (0,1):
            if 'transform' in paths[i].keys():
                trans = paths[i].get('transform')
                trans = simpletransform.parseTransform(trans)
                simpletransform.applyTransformToPath(trans, pts[i])

        verts = []
        for i in range(0, min(map(len, pts))):
            comp = []
            for j in range(0, min(len(pts[0][i]), len(pts[1][i]))):
                comp.append([pts[0][i][j][1][-2:], pts[1][i][j][1][-2:]])
            verts.append(comp)

        if self.options.mode.lower() == 'lines':
            line = []
            for comp in verts:
                for n,v in enumerate(comp):
                  line += [('M', v[0])]
                  line += [('L', v[1])]
            ele = inkex.etree.Element('{http://www.w3.org/2000/svg}path')
            paths[0].xpath('..')[0].append(ele)
            ele.set('d', simplepath.formatPath(line))
            ele.set('style', 'fill:none;stroke:#000000;stroke-opacity:1;stroke-width:1;')
        elif self.options.mode.lower() == 'polygons':
            g = inkex.etree.Element('{http://www.w3.org/2000/svg}g')
            g.set('style', 'fill:#000000;stroke:#000000;fill-opacity:0.3;stroke-width:2;stroke-opacity:0.6;')   
            paths[0].xpath('..')[0].append(g)
            for comp in verts:
                for n,v in enumerate(comp):
                    nn = n+1
                    if nn == len(comp): nn = 0
                    line = []
                    line += [('M', comp[n][0])]
                    line += [('L', comp[n][1])]
                    line += [('L', comp[nn][1])]
                    line += [('L', comp[nn][0])]
                    line += [('L', comp[n][0])]
                    ele = inkex.etree.Element('{http://www.w3.org/2000/svg}path')
                    g.append(ele)
                    ele.set('d', simplepath.formatPath(line))