276 lines
9.6 KiB
Python
276 lines
9.6 KiB
Python
|
#! /usr/bin/env python
|
||
|
|
"""
|
||
|
|
living_hinge.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
|
||
|
|
"""
|
||
|
|
|
||
|
|
"""
|
||
|
|
Change in version 0.2
|
||
|
|
|
||
|
|
Changed self.unittouu to self.unittouu
|
||
|
|
and self.uutounit to self.uutounit
|
||
|
|
to make it work with Inkscape 0.91
|
||
|
|
Thanks to Pete Prodoehl for pointing this out.
|
||
|
|
"""
|
||
|
|
|
||
|
|
"""
|
||
|
|
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
|
||
|
|
"""
|
||
|
|
|
||
|
|
|
||
|
|
__version__ = "0.3"
|
||
|
|
|
||
|
|
import sys,inkex,simplestyle,gettext
|
||
|
|
_ = gettext.gettext
|
||
|
|
|
||
|
|
def drawS(parent, XYstring): # Draw lines from a list
|
||
|
|
name='part'
|
||
|
|
style = { 'stroke': '#000000', 'fill': 'none', 'stroke-width': self.unittouu("0.1 mm") }
|
||
|
|
drw = {'style':simplestyle.formatStyle(style),inkex.addNS('label','inkscape'):name,'d':XYstring}
|
||
|
|
inkex.etree.SubElement(parent, inkex.addNS('path','svg'), drw )
|
||
|
|
return
|
||
|
|
|
||
|
|
|
||
|
|
class HingeCuts(inkex.Effect):
|
||
|
|
def __init__(self):
|
||
|
|
# Call the base class constructor.
|
||
|
|
inkex.Effect.__init__(self)
|
||
|
|
# Define options - Must match to the <param> elements in the .inx file
|
||
|
|
self.OptionParser.add_option('--direction',action='store',type='string', dest='direction',default='y',help='cuts direction')
|
||
|
|
self.OptionParser.add_option('--unit',action='store',type='string', dest='unit',default='mm',help='units of measurement')
|
||
|
|
self.OptionParser.add_option('--cut_length',action='store',type='float', dest='cut_length',default=0,help='length of the cuts for the hinge.')
|
||
|
|
self.OptionParser.add_option('--gap_length',action='store',type='float', dest='gap_length',default=0,help='separation distance between successive hinge cuts.')
|
||
|
|
self.OptionParser.add_option('--sep_distance',action='store',type='float', dest='sep_distance',default=0,help='distance between successive lines of hinge cuts.')
|
||
|
|
|
||
|
|
def effect(self):
|
||
|
|
|
||
|
|
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.unittouu(str(self.options.cut_length) + unit)
|
||
|
|
# cut separation in the y-direction
|
||
|
|
d = self.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.unittouu(str(self.options.sep_distance) + unit)
|
||
|
|
|
||
|
|
# get selected nodes
|
||
|
|
if self.selected:
|
||
|
|
# put lines on the current layer
|
||
|
|
parent = self.current_layer
|
||
|
|
for id, node in self.selected.iteritems():
|
||
|
|
# inkex.debug("id:" + id)
|
||
|
|
# for key in node.attrib.keys():
|
||
|
|
# inkex.debug(key + ": " + node.get(key))
|
||
|
|
x = float(node.get("x"))
|
||
|
|
dx = float(node.get("width"))
|
||
|
|
y = float(node.get("y"))
|
||
|
|
dy = float(node.get("height"))
|
||
|
|
|
||
|
|
# calculate the cut lines for the hinge
|
||
|
|
if (dir=="y"):
|
||
|
|
lines, l_actual, d_actual, dd_actual = self.calcYCutLines(x, y, dx, dy, l, d, dd)
|
||
|
|
else:
|
||
|
|
lines, l_actual, d_actual, dd_actual = self.calcXCutLines(x, y, dx, dy, l, d, dd)
|
||
|
|
|
||
|
|
|
||
|
|
# all the lines are one path. Prepare the string that describes the path.
|
||
|
|
s = ''
|
||
|
|
for line in lines:
|
||
|
|
s = s + "M %s, %s L %s, %s " % (line['x1'], line['y1'], line['x2'], line['y2'])
|
||
|
|
# add the path to the document
|
||
|
|
style = { 'stroke': '#000000', 'fill': 'none', 'stroke-width': self.unittouu("0.1 mm")}
|
||
|
|
drw = {'style':simplestyle.formatStyle(style), 'd': s}
|
||
|
|
hinge = inkex.etree.SubElement(parent, inkex.addNS('path', 'svg'), drw)
|
||
|
|
# add a description element to hold the parameters used to create the cut lines
|
||
|
|
desc = inkex.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" \
|
||
|
|
"separation distance: %.2f %s (%.2f %s)" % (self.uutounit(l_actual, unit), unit, self.uutounit(l, unit), unit,
|
||
|
|
self.uutounit(d_actual, unit), unit, self.uutounit(d, unit), unit,
|
||
|
|
self.uutounit(dd_actual, unit), unit, self.uutounit(dd, unit), unit)
|
||
|
|
else:
|
||
|
|
inkex.debug("No rectangle(s) have been selected.")
|
||
|
|
|
||
|
|
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}, ... ]
|
||
|
|
|
||
|
|
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
|
||
|
|
|
||
|
|
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 = []
|
||
|
|
|
||
|
|
# 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.
|
||
|
|
l = (dy-d)/p - d
|
||
|
|
|
||
|
|
# 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
|
||
|
|
|
||
|
|
#
|
||
|
|
# 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.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
|
||
|
|
|
||
|
|
return (ret, l, d, dd)
|
||
|
|
|
||
|
|
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}, ... ]
|
||
|
|
|
||
|
|
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
|
||
|
|
|
||
|
|
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)
|
||
|
|
|
||
|
|
|
||
|
|
# Create effect instance and apply it.
|
||
|
|
effect = HingeCuts()
|
||
|
|
effect.affect()
|