1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
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()
|
