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- #!/usr/bin/env python
- '''
- This extension module can measure arbitrary path and object length
- It adds a text to the selected path containing the length in a
- given unit.
-
- Copyright (C) 2010 Alvin Penner
- Copyright (C) 2006 Georg Wiora
- Copyright (C) 2006 Nathan Hurst
- Copyright (C) 2005 Aaron Spike, aaron@ekips.org
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-
- TODO:
- * should use the standard attributes for text
- * Implement option to keep text orientation upright
- 1. Find text direction i.e. path tangent,
- 2. check direction >90 or <-90 Degrees
- 3. rotate by 180 degrees around text center
- '''
- import inkex, simplestyle, simplepath, sys, cubicsuperpath, bezmisc, locale
- # Set current system 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
- n0 = 0.0
- x0 = 0.0
- y0 = 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])
- if abs(sp[i-1][1][0]-sp[i][1][0]) > 0.001 or abs(sp[i-1][1][1]-sp[i][1][1]) > 0.001:
- n0 += 1.0
- x0 += sp[i][1][0]
- y0 += sp[i][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), x0/n0, y0/n0
-
- 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)
- # 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 =[]
- p = cubicsuperpath.parsePath(node.get('d'))
- num = 1
- factor = 1.0/inkex.unittouu('1'+self.options.unit)
- if self.options.type == "length":
- slengths, stotal = csplength(p)
- else:
- stotal,x0,y0 = csparea(p)
- stotal *= 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, self.options.offset)
- else:
- self.addTextWithTspan(self.group,x0,y0,lenstr+' '+self.options.unit+'^2', id, self.options.offset)
-
-
- def addTextOnPath(self,node,x,y,text, id,dy=0):
- new = inkex.etree.SubElement(node,inkex.addNS('textPath','svg'))
- s = {'text-align': 'center', 'vertical-align': 'bottom',
- 'text-anchor': 'middle', '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', "50%")
- 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))
-
- def addTextWithTspan(self,node,x,y,text,id,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': 'middle', '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', "50%")
- new.set('dy', str(dy))
- new.text = str(text)
- node.set('x', str(x))
- node.set('y', str(y))
-
- if __name__ == '__main__':
- e = Length()
- e.affect()
-
-
- # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99
-