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