#!/usr/bin/env python # coding=utf-8 # # Copyright (C) 2015 ~suv # 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. # """ This extension module can measure arbitrary path and object length It adds text to the selected path containing the length in a given unit. Area and Center of Mass calculated using Green's Theorem: http://mathworld.wolfram.com/GreensTheorem.html """ import inkex from inkex import TextElement, TextPath, Tspan from inkex.bezier import csparea, cspcofm, csplength class MeasureLength(inkex.EffectExtension): """Measure the length of selected paths""" def add_arguments(self, pars): pars.add_argument("--type", dest="mtype", default="length",\ help="Type of measurement") pars.add_argument("--method", type=self.arg_method(), default=self.method_textonpath,\ help="Text Orientation method") pars.add_argument("--presetFormat", default="TaP_start", help="Preset text layout") pars.add_argument("--startOffset", default="custom", help="Text Offset along Path") pars.add_argument("--startOffsetCustom", type=int, default=50,\ help="Text Offset along Path") pars.add_argument("--anchor", default="start", help="Text Anchor") pars.add_argument("--position", default="start", help="Text Position") pars.add_argument("--angle", type=float, default=0, help="Angle") pars.add_argument("-f", "--fontsize", type=int, default=20,\ help="Size of length label text in px") pars.add_argument("-o", "--offset", type=float, default=-6,\ help="The distance above the curve") pars.add_argument("-u", "--unit", default="mm",\ help="The unit of the measurement") pars.add_argument("-p", "--precision", type=int, default=2,\ help="Number of significant digits after decimal point") pars.add_argument("-s", "--scale", type=float, default=1.1,\ help="Scale Factor (Drawing:Real Length)") def effect(self): # get number of digits prec = int(self.options.precision) scale = self.svg.unittouu('1px') # convert to document units self.options.offset *= scale factor = 1.0 if self.svg.get('viewBox'): factor = self.svg.scale / self.svg.unittouu('1px') self.options.fontsize /= factor factor *= scale / self.svg.unittouu('1' + self.options.unit) # loop over all selected paths for node in self.svg.selection.filter(inkex.PathElement).values(): csp = node.path.transform(node.composed_transform()).to_superpath() if self.options.mtype == "length": slengths, stotal = csplength(csp) self.group = node.getparent().add(TextElement()) elif self.options.mtype == "area": stotal = abs(csparea(csp) * factor * self.options.scale) self.group = node.getparent().add(TextElement()) else: try: xc, yc = cspcofm(csp) except ValueError as err: raise inkex.AbortExtension(str(err)) self.group = node.getparent().add(inkex.PathElement()) self.group.set('id', 'MassCenter_' + node.get('id')) self.add_cross(self.group, xc, yc, scale) continue # Format the length as string val = round(stotal * factor * self.options.scale, prec) self.options.method(node, str(val)) def method_textonpath(self, node, lenstr): startOffset = self.options.startOffset if startOffset == "custom": startOffset = str(self.options.startOffsetCustom) + '%' if self.options.mtype == "length": self.add_textonpath(self.group, 0, 0, lenstr + ' ' + self.options.unit, node, self.options.anchor, startOffset, self.options.offset) else: self.add_textonpath(self.group, 0, 0, lenstr + ' ' + self.options.unit + '^2', node, self.options.anchor, startOffset, self.options.offset) def method_fixedtext(self, node, lenstr): _id = node.get('id') csp = node.path.transform(node.composed_transform()).to_superpath() if self.options.position == "mass": tx, ty = cspcofm(csp) anchor = 'middle' elif self.options.position == "center": bbox = node.bounding_box() tx, ty = bbox.center anchor = 'middle' else: # default tx = csp[0][0][1][0] ty = csp[0][0][1][1] anchor = 'start' if self.options.mtype == "length": self.add_fixedtext(self.group, tx, ty, lenstr + ' ' + self.options.unit, anchor, -int(self.options.angle), self.options.offset + self.options.fontsize / 2) else: self.add_fixedtext(self.group, tx, ty, lenstr + ' ' + self.options.unit + '^2', anchor, -int(self.options.angle), -self.options.offset + self.options.fontsize / 2) def method_presets(self, node, lenstr): """A preset option for alignments""" preset_dict = { 'default_cofm': [None, None, None, None, None], 'default_length': [self.method_textonpath, "50%", "start", None, None], 'TaP_start': [self.method_textonpath, "0%", "start", None, None], 'TaP_middle': [self.method_textonpath, "50%", "middle", None, None], 'TaP_end': [self.method_textonpath, "100%", "end", None, None], 'default_area': [self.method_fixedtext, None, None, "start", 0.0], 'FT_start': [self.method_fixedtext, None, None, "start", 0.0], 'FT_bbox': [self.method_fixedtext, None, None, "center", 0.0], 'FT_mass': [self.method_fixedtext, None, None, "mass", 0.0], } if self.options.presetFormat == "default": current_preset = 'default_' + self.options.mtype else: current_preset = self.options.presetFormat self.options.startOffset = preset_dict[current_preset][1] self.options.anchor = preset_dict[current_preset][2] self.options.position = preset_dict[current_preset][3] self.options.angle = preset_dict[current_preset][4] method = preset_dict[current_preset][0] if method is not None: return method(node, lenstr) def add_cross(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 add_textonpath(self, node, x, y, text, _node, anchor, startOffset, dy=0): new = node.add(TextPath()) 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.style = s new.href = _node new.set('startOffset', startOffset) new.set('dy', str(dy)) # dubious merit # new.append(tp) if text[-2:] == "^2": new.append(Tspan.superscript("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 add_fixedtext(self, node, x, y, text, anchor, angle, dy=0): new = node.add(Tspan()) new.set('sodipodi:role', '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.style = s new.set('dy', str(dy)) if text[-2:] == "^2": new.append(Tspan.superscript("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__': MeasureLength().run()