measure.py revision 7609b45118d1b87b7f333baf47f7f3797173935b
#!/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) 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
class Length(inkex.Effect):
def __init__(self):
inkex.Effect.__init__(self)
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 pathes
for id, node in self.selected.iteritems():
if node.tagName == 'path':
# self.group = self.document.createElement('svg:g')
self.group = self.document.createElement('svg:text')
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)
''' Wio: Umrechnung in unit '''
if self.options.unit=="mm":
factor=0.2822219 # px->mm
elif self.options.unit=="pt":
factor=0.80 # px->pt
elif self.options.unit=="cm":
factor=0.02822219 # px->cm
elif self.options.unit=="m":
factor=0.0002822219 # px->m
elif self.options.unit=="km":
factor=0.0000002822219 # px->km
elif self.options.unit=="in":
factor=0.2822219/25.4 # px->in
else :
''' Default unit is px'''
factor=1
self.options.unit="px"
# Format the length as string
lenstr = locale.format("%(len)25."+str(prec)+"f",{'len':round(stotal*factor*self.options.scale,prec)}).strip()
self.addTextOnPath(self.group,0, 0,lenstr+' '+self.options.unit, id, self.options.offset)
def addTextOnPath(self,node,x,y,text, id,dy=0):
#new = self.document.createElement('svg:text')
new = self.document.createElement('svg:textPath')
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.setAttribute('style', simplestyle.formatStyle(s))
node.setAttribute('x', str(x))
node.setAttribute('y', str(y))
#node.setAttribute('transform','rotate(180,'+str(-x)+','+str(-y)+')')
new.setAttributeNS('http://www.w3.org/1999/xlink','xlink:href', '#'+id)
new.setAttribute('startOffset', "50%")
new.setAttribute('dy', str(dy)) # dubious merit
#new.appendChild(tp)
new.appendChild(self.document.createTextNode(str(text)))
node.appendChild(new)
e = Length()
e.affect()