import locale

import inkex

import simplestyle

import simpletransform

import cubicsuperpath

import bezmisc

inkex.localize()

locale.setlocale(locale.LC_ALL, '')

try:

import numpy

except:

inkex.errormsg(_("Failed to import the numpy modules. These modules are required by this extension. Please install them and try again. On a Debian-like system this can be done with the command, sudo apt-get install python-numpy."))

exit()

mat_area = numpy.matrix([[ 0, 2, 1, -3],[ -2, 0, 1, 1],[ -1, -1, 0, 2],[ 3, -1, -2, 0]])

mat_cofm_0 = numpy.matrix([[ 0, 35, 10,-45],[-35, 0, 12, 23],[-10,-12, 0, 22],[ 45,-23,-22, 0]])

mat_cofm_1 = numpy.matrix([[ 0, 15, 3,-18],[-15, 0, 9, 6],[ -3, -9, 0, 12],[ 18, -6,-12, 0]])

mat_cofm_2 = numpy.matrix([[ 0, 12, 6,-18],[-12, 0, 9, 3],[ -6, -9, 0, 15],[ 18, -3,-15, 0]])

mat_cofm_3 = numpy.matrix([[ 0, 22, 23,-45],[-22, 0, 12, 10],[-23,-12, 0, 35],[ 45,-10,-35, 0]])

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:

if len(sp) < 2: continue

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

vec_x = numpy.matrix([sp[i-1][1][0], sp[i-1][2][0], sp[i][0][0], sp[i][1][0]])

vec_y = numpy.matrix([sp[i-1][1][1], sp[i-1][2][1], sp[i][0][1], sp[i][1][1]])

area += 0.15*(vec_x*mat_area*vec_y.T)[0,0]

return -area # require positive area for CCW

def cspcofm(csp):

area = csparea(csp)

xc = 0.0

yc = 0.0

if abs(area) < 1.e-8:

inkex.errormsg(_("Area is zero, cannot calculate Center of Mass"))

return 0, 0

for sp in csp:

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

xc += sp[i-1][1][1]*(sp[i-2][1][0] - sp[i][1][0])*(sp[i-2][1][0] + sp[i-1][1][0] + sp[i][1][0])/6

yc += sp[i-1][1][0]*(sp[i][1][1] - sp[i-2][1][1])*(sp[i-2][1][1] + sp[i-1][1][1] + sp[i][1][1])/6

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

vec_x = numpy.matrix([sp[i-1][1][0], sp[i-1][2][0], sp[i][0][0], sp[i][1][0]])

vec_y = numpy.matrix([sp[i-1][1][1], sp[i-1][2][1], sp[i][0][1], sp[i][1][1]])

vec_t = numpy.matrix([(vec_x*mat_cofm_0*vec_y.T)[0,0], (vec_x*mat_cofm_1*vec_y.T)[0,0], (vec_x*mat_cofm_2*vec_y.T)[0,0], (vec_x*mat_cofm_3*vec_y.T)[0,0]])

xc += (vec_x*vec_t.T)[0,0]/280

yc += (vec_y*vec_t.T)[0,0]/280

return -xc/area, -yc/area

def appendSuperScript(node, text):

super = inkex.etree.SubElement(node, inkex.addNS('tspan', 'svg'), {'style': 'font-size:65%;baseline-shift:super'})

super.text = text

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("--format",

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

dest="format", default="textonpath",

help="Text Orientation")

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

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

dest="angle", default=0,

help="Angle")

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="Scale Factor (Drawing:Real Length)")

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)

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

self.options.offset *= scale

factor = 1.0

doc = self.document.getroot()

if doc.get('viewBox'):

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

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

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

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

factor /= self.unittouu('1px')

self.options.fontsize /= factor

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

# loop over all selected paths

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

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

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)

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

slengths, stotal = csplength(p)

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

elif self.options.type == "area":

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

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

else:

xc, yc = cspcofm(p)

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

self.group.set('id', 'MassCenter_' + node.get('id'))

self.addCross(self.group, xc, yc, scale)

continue

# 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.format == 'textonpath':

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)

else:

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

self.addTextWithTspan(self.group, p[0][0][1][0], p[0][0][1][1], lenstr+' '+self.options.unit, id, 'start', -int(self.options.angle), self.options.offset + self.options.fontsize/2)

else:

self.addTextWithTspan(self.group, p[0][0][1][0], p[0][0][1][1], lenstr+' '+self.options.unit+'^2', id, 'start', -int(self.options.angle), -self.options.offset + self.options.fontsize/2)

def addCross(self, node, x, y, scale):

l = 3*scale # 3 pixels in document units

node.set('d', 'm %s,%s %s,0 %s,0 m %s,%s 0,%s 0,%s' % (str(x-l), str(y), str(l), str(l), str(-l), str(-l), str(l), str(l)))

node.set('style', 'stroke:#000000;fill:none;stroke-width:%s' % str(0.5*scale))

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)

if text[-2:] == "^2":

appendSuperScript(new, "2")

new.text = str(text)[:-2]

else:

new.text = str(text)

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

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

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

def addTextWithTspan(self, node, x, y, text, id, anchor, angle, dy = 0):

new = inkex.etree.SubElement(node,inkex.addNS('tspan','svg'), {inkex.addNS('role','sodipodi'): 'line'})

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('dy', str(dy))

if text[-2:] == "^2":

appendSuperScript(new, "2")

new.text = str(text)[:-2]

else:

new.text = str(text)

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

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

node.set('transform', 'rotate(%s, %s, %s)' % (angle, x, y))

if __name__ == '__main__':

e = Length()

e.affect()