#!/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()