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Diffstat (limited to '')
| -rwxr-xr-x | share/extensions/measure.py | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/share/extensions/measure.py b/share/extensions/measure.py new file mode 100755 index 0000000..2f18f9c --- /dev/null +++ b/share/extensions/measure.py @@ -0,0 +1,195 @@ +#!/usr/bin/env python +# coding=utf-8 +# +# Copyright (C) 2015 ~suv <suv-sf@users.sf.net> +# 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() |