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

locale.setlocale(locale.LC_ALL, '')

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

def csparea(csp):

area = 0.0

for sp in csp:

for i in range(len(sp)): # calculate polygon area

area += 0.5*sp[i-1][1][0]*(sp[i][1][1] - sp[i-2][1][1])

for i in range(1, len(sp)): # add contribution from cubic Bezier

bezarea = ( 0.0*sp[i-1][1][1] + 2.0*sp[i-1][2][1] + 1.0*sp[i][0][1] - 3.0*sp[i][1][1])*sp[i-1][1][0]

bezarea += (-2.0*sp[i-1][1][1] + 0.0*sp[i-1][2][1] + 1.0*sp[i][0][1] + 1.0*sp[i][1][1])*sp[i-1][2][0]

bezarea += (-1.0*sp[i-1][1][1] - 1.0*sp[i-1][2][1] + 0.0*sp[i][0][1] + 2.0*sp[i][1][1])*sp[i][0][0]

bezarea += ( 3.0*sp[i-1][1][1] - 1.0*sp[i-1][2][1] - 2.0*sp[i][0][1] + 0.0*sp[i][1][1])*sp[i][1][0]

area += 0.15*bezarea

return abs(area)

class Length(inkex.Effect):

def __init__(self):

inkex.Effect.__init__(self)

self.OptionParser.add_option("--type",

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

dest="type", default="length",

help="Type of measurement")

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

action="store", type="int",

dest="fontsize", default=20,

help="Size of length lable text in px")

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

action="store", type="float",

dest="offset", default=-6,

help="The distance above the curve")

self.OptionParser.add_option("-u", "--unit",

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

dest="unit", default="mm",

help="The unit of the measurement")

self.OptionParser.add_option("-p", "--precision",

action="store", type="int",

dest="precision", default=2,

help="Number of significant digits after decimal point")

self.OptionParser.add_option("-s", "--scale",

action="store", type="float",

dest="scale", default=1,

help="The distance above the curve")

self.OptionParser.add_option("-r", "--orient",

action="store", type="inkbool",

dest="orient", default=True,

help="Keep orientation of text upright")

self.OptionParser.add_option("--tab",

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

dest="tab", default="sampling",

help="The selected UI-tab when OK was pressed")

self.OptionParser.add_option("--measurehelp",

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

dest="measurehelp", default="",

help="dummy")

def effect(self):

# get number of digits

prec = int(self.options.precision)

factor = 1.0

doc = self.document.getroot()

if doc.get('viewBox'):

[viewx, viewy, vieww, viewh] = doc.get('viewBox').split(' ')

factor = float(doc.get('width'))/float(vieww)

if float(doc.get('height'))/float(viewh) < factor:

factor = float(doc.get('height'))/float(viewh)

self.options.fontsize /= factor

# loop over all selected paths

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

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

self.group = inkex.etree.SubElement(node.getparent(),inkex.addNS('text','svg'))

# t = node.get('transform')

# Removed to fix LP #308183

# (Measure Path text shifted when used with a copied object)

#if t:

# self.group.set('transform', t)

a =[]

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

p = cubicsuperpath.parsePath(node.get('d'))

simpletransform.applyTransformToPath(mat, p)

factor = factor/inkex.unittouu('1'+self.options.unit)

if self.options.type == "length":

slengths, stotal = csplength(p)

else:

stotal = csparea(p)*factor*self.options.scale

# Format the length as string

lenstr = locale.format("%(len)25."+str(prec)+"f",{'len':round(stotal*factor*self.options.scale,prec)}).strip()

if self.options.type == "length":

self.addTextOnPath(self.group, 0, 0, lenstr+' '+self.options.unit, id, 'start', '50%', self.options.offset)

else:

self.addTextOnPath(self.group, 0, 0, lenstr+' '+self.options.unit+'^2', id, 'start', '0%', self.options.offset)

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

new = inkex.etree.SubElement(node,inkex.addNS('textPath','svg'))

s = {'text-align': 'center', 'vertical-align': 'bottom',

'text-anchor': anchor, 'font-size': str(self.options.fontsize),

'fill-opacity': '1.0', 'stroke': 'none',

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

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

new.set(inkex.addNS('href','xlink'), '#'+id)

new.set('startOffset', startOffset)

new.set('dy', str(dy)) # dubious merit

#new.append(tp)

new.text = str(text)

#node.set('transform','rotate(180,'+str(-x)+','+str(-y)+')')

node.set('x', str(x))

node.set('y', str(y))

if __name__ == '__main__':

e = Length()

e.affect()