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#!/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
from inkex.localization import inkex_gettext as _
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="default", 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=12,
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="px", 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=1.0,
help="Scale Factor (Drawing:Real Length)",
)
def effect(self):
# get number of digits
prec = int(self.options.precision)
scale = self.svg.viewport_to_unit(
"1" + self.svg.document_unit
) # convert to document units
self.options.offset *= scale
factor = self.svg.unit_to_viewport(1, self.options.unit)
# loop over all selected paths
filtered = self.svg.selection.filter(inkex.PathElement)
if not filtered:
raise inkex.AbortExtension(_("Please select at least one path object."))
for node in filtered:
csp = node.path.transform(node.composed_transform()).to_superpath()
inverse_parent_transform = -node.getparent().composed_transform()
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)
self.group.transform = inverse_parent_transform
continue
# Format the length as string
val = round(stotal * factor * self.options.scale, prec)
# Transform the result back
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(True)
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": self.svg.viewport_to_unit(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))
node.transform = -node.getparent().composed_transform() @ node.transform
if __name__ == "__main__":
MeasureLength().run()
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