mightyscape-1.2/extensions/fablabchemnitz/living_hinge/living_hinge.py

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#!/usr/bin/env python3
"""
hinge_cuts.py
A module for creating lines to laser cut living hinges
Copyright (C) 2013 Mark Endicott; drphonon@gmail.com
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.
For a copy of the GNU General Public License
write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
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"""
Change in version 0.2.
Changed self.unittouu to self.svg.unittouu
and self.uutounit to self.uutounit
to make it work with Inkscape 0.91
Thanks to Pete Prodoehl for pointing this out.
"""
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"""
Change in version 0.3
Add a direction option so the cuts can be done in the X or Y direction.
Modification by Sylvain GARNAVAULT; garnav@wanadoo.fr
"""
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"""
Change in version 0.4.
Python3 / inkscape 1.0 migration
"""
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__version__ = "0.4"
import inkex
import gettext
_ = gettext.gettext
from lxml import etree
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from inkex import Rectangle
class LivingHinge(inkex.EffectExtension):
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def add_arguments(self, pars):
pars.add_argument('--direction',default='y',help='cuts direction')
pars.add_argument('--unit',default='mm',help='units of measurement')
pars.add_argument('--cut_length',type=float, default=0,help='length of the cuts for the hinge.')
pars.add_argument('--gap_length',type=float, default=0,help='separation distance between successive hinge cuts.')
pars.add_argument('--sep_distance',type=float, default=0,help='distance between successive lines of hinge cuts.')
def effect(self):
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unit=self.options.unit
# which direction are we cutting
dir = self.options.direction
# starting cut length. Will be adjusted for get an integer number of cuts in the y-direction.
l = self.svg.unittouu(str(self.options.cut_length) + unit)
# cut separation in the y-direction
d = self.svg.unittouu(str(self.options.gap_length) + unit)
# starting separation between lines of cuts in the x-direction. Will be adjusted to get an integer
# number of cut lines in the x-direction.
dd = self.svg.unittouu(str(self.options.sep_distance) + unit)
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# get selected nodes
if self.svg.selected:
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# put lines on the current layer
parent = self.svg.get_current_layer()
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for id, node in self.svg.selection.filter(Rectangle).items():
# inkex.utils.debug("id:" + id)
# for key in node.attrib.keys():
# inkex.utils.debug(key + ": " + node.get(key))
bbox = node.bounding_box()
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# calculate the cut lines for the hinge
if (dir=="y"):
lines, l_actual, d_actual, dd_actual = self.calcYCutLines(bbox.left, bbox.top, bbox.width, bbox.height, l, d, dd)
else:
lines, l_actual, d_actual, dd_actual = self.calcXCutLines(bbox.left, bbox.top, bbox.width, bbox.height, l, d, dd)
s = ''
for line in lines:
s = s + "M %s, %s L %s, %s " % (line['x1'], line['y1'], line['x2'], line['y2'])
style = { 'stroke': '#000000', 'fill': 'none', 'stroke-width': self.svg.unittouu("0.1 mm")}
drw = {'style':str(inkex.Style(style)), 'd': s}
hinge = etree.SubElement(parent, inkex.addNS('path', 'svg'), drw)
desc = etree.SubElement(hinge, inkex.addNS('desc', 'svg'))
desc.text = "Hinge cut parameters: actual(requested)\n" \
"cut length: %.2f %s (%.2f %s)\n" \
"gap length: %.2f %s (%.2f %s)\n" \
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"separation distance: %.2f %s (%.2f %s)" % (self.svg.uutounit(l_actual, unit), unit, self.svg.uutounit(l, unit), unit,
self.svg.uutounit(d_actual, unit), unit, self.svg.uutounit(d, unit), unit,
self.svg.uutounit(dd_actual, unit), unit, self.svg.uutounit(dd, unit), unit)
else:
inkex.utils.debug("No rectangle(s) have been selected.")
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def calcYCutLines(self, x, y, dx, dy, l, d, dd):
"""
Return a list of cut lines as dicts. Each dict contains the end points for one cut line.
[{x1, y1, x2, y2}, ... ]
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Parameters
x, y: the coordinates of the lower left corner of the bounding rect
dx, dy: width and height of the bounding rect
l: the nominal length of a cut line
d: the separation between cut lines in the y-direction
dd: the nominal separation between cut lines in the x-direction
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l will be adjusted so that there is an integral number of cuts in the y-direction.
dd will be adjusted so that there is an integral number of cuts in the x-direction.
"""
ret = []
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# use l as a starting guess. Adjust it so that we get an integer number of cuts in the y-direction
# First compute the number of cuts in the y-direction using l. This will not in general be an integer.
p = (dy-d)/(d+l)
#round p to the nearest integer
p = round(p)
#compute the new l that will result in p cuts in the y-direction.
if p == 0:
p = 1 #avoid divison by zero
l = (dy-d)/p - d
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# use dd as a starting guess. Adjust it so that we get an even integer number of cut lines in the x-direction.
p = dx/dd
p = round(p)
if p % 2 == 1:
p = p + 1
dd = dx/p
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#
# Column A cuts
#
currx = 0
donex = False
while not donex:
doney = False
starty = 0
endy = (l + d)/2.0
while not doney:
if endy >= dy:
endy = dy
# Add the end points of the line
ret.append({'x1' : x + currx, 'y1' : y + starty, 'x2': x + currx, 'y2': y + endy})
starty = endy + d
endy = starty + l
if starty >= dy:
doney = True
currx = currx + dd * 2.0
if currx - dx > dd:
donex = True
# inkex.utils.debug("lastx: " + str(lastx) + "; currx: " + str(currx))
#
#Column B cuts
#
currx = dd
donex = False
while not donex:
doney = False
starty = d
endy = starty + l
while not doney:
if endy >= dy:
endy = dy
# create a line
ret.append({'x1' : x + currx, 'y1' : y + starty, 'x2': x + currx, 'y2': y + endy})
starty = endy + d
endy = starty + l
if starty >= dy:
doney = True
currx = currx + dd*2.0
if currx > dx:
donex = True
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return (ret, l, d, dd)
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def calcXCutLines(self, x, y, dx, dy, l, d, dd):
"""
Return a list of cut lines as dicts. Each dict contains the end points for one cut line.
[{x1, y1, x2, y2}, ... ]
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Parameters
x, y: the coordinates of the lower left corner of the bounding rect
dx, dy: width and height of the bounding rect
l: the nominal length of a cut line
d: the separation between cut lines in the x-direction
dd: the nominal separation between cut lines in the y-direction
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l will be adjusted so that there is an integral number of cuts in the x-direction.
dd will be adjusted so that there is an integral number of cuts in the y-direction.
"""
ret = []
# use l as a starting guess. Adjust it so that we get an integer number of cuts in the y-direction
# First compute the number of cuts in the x-direction using l. This will not in general be an integer.
p = (dx-d)/(d+l)
#round p to the nearest integer
p = round(p)
#compute the new l that will result in p cuts in the x-direction.
l = (dx-d)/p - d
# use dd as a starting guess. Adjust it so that we get an even integer number of cut lines in the y-direction.
p = dy/dd
p = round(p)
if p % 2 == 1:
p = p + 1
dd = dy/p
#
# Rows A cuts
#
curry = 0
doney = False
while not doney:
donex = False
startx = 0
endx = (l + d)/2.0
while not donex:
if endx >= dx:
endx = dx
# Add the end points of the line
ret.append({'x1' : x + startx, 'y1' : y + curry, 'x2': x + endx, 'y2': y + curry})
startx = endx + d
endx = startx + l
if startx >= dx:
donex = True
curry = curry + dd * 2.0
if curry - dy > dd:
doney = True
#
# Rows B cuts
#
curry = dd
doney = False
while not doney:
donex = False
startx = d
endx = startx + l
while not donex:
if endx >= dx:
endx = dx
# create a line
ret.append({'x1' : x + startx, 'y1' : y + curry, 'x2': x + endx, 'y2': y + curry})
startx = endx + d
endx = startx + l
if startx >= dx:
donex = True
curry = curry + dd*2.0
if curry > dy:
doney = True
return (ret, l, d, dd)
if __name__ == '__main__':
LivingHinge().run()