import inkex, simplestyle, simplepath,sys,cubicsuperpath, bezmisc

def numsegs(csp):

return sum([len(p)-1 for p in csp])

def interpcoord(v1,v2,p):

return v1+((v2-v1)*p)

def interppoints(p1,p2,p):

return [interpcoord(p1[0],p2[0],p),interpcoord(p1[1],p2[1],p)]

def pointdistance((x1,y1),(x2,y2)):

return math.sqrt(((x2 - x1) ** 2) + ((y2 - y1) ** 2))

def bezlenapprx(sp1, sp2):

return pointdistance(sp1[1], sp1[2]) + pointdistance(sp1[2], sp2[0]) + pointdistance(sp2[0], sp2[1])

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

class Length(inkex.Effect):

def __init__(self):

inkex.Effect.__init__(self)

self.OptionParser.add_option("-f", "--fontsize",

action="store", type="string",

dest="fontsize", default="20",

help="Size of node label numbers")

self.OptionParser.add_option("-o", "--offset",

action="store", type="string",

dest="offset", default="-4",

help="The distance above the curve")

def effect(self):

for id, node in self.selected.iteritems():

if node.tagName == 'path':

self.group = self.document.createElement('svg:g')

node.parentNode.appendChild(self.group)

try:

t = node.attributes.getNamedItem('transform').value

self.group.setAttribute('transform', t)

except AttributeError:

pass

a =[]

p = cubicsuperpath.parsePath(node.attributes.getNamedItem('d').value)

num = 1

slengths, stotal = csplength(p)

self.addTextOnPath(self.group,0, 0,str(stotal), id, self.options.offset)

def addTextOnPath(self,node,x,y,text, id,dy=0):

new = self.document.createElement('svg:text')

tp = self.document.createElement('svg:textPath')

s = {'font-size': self.options.fontsize, 'fill-opacity': '1.0', 'stroke': 'none',

'font-weight': 'normal', 'font-style': 'normal', 'fill': '#000000'}

new.setAttribute('style', simplestyle.formatStyle(s))

new.setAttribute('x', str(x))

new.setAttribute('y', str(y))

tp.setAttributeNS('http://www.w3.org/1999/xlink','xlink:href', '#'+id)

tp.setAttribute('startOffset', "50%")

#tp.setAttribute('dy', dy) # dubious merit

new.appendChild(tp)

tp.appendChild(self.document.createTextNode(str(text)))

node.appendChild(new)

e = Length()

e.affect()