322 lines
13 KiB
Python
322 lines
13 KiB
Python
#! /usr/bin/env python3
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'''
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Generates Inkscape SVG file containing box components needed to
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laser cut a tabbed construction box taking kerf and clearance into account
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Copyright (C) 2011 elliot white elliot@twot.eu
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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 3 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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'''
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__version__ = "0.8" ### please report bugs, suggestions etc to bugs@twot.eu ###
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from ink_helper import *
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from lxml import etree
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def drill(center, diameter, n_pt):
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from math import sin, cos, pi
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center = Vec2(center)
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radius = diameter / 2.
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out = Vec2([1, 0])
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up = Vec2([0, 1])
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path = Path([center + out * radius])
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dtheta = (2 * pi) / n_pt
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for i in range(n_pt + 1):
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path.append(center + out * radius * cos(i * dtheta) + up * radius * sin(i * dtheta))
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return path
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def t_slot(center, orient, screw_diameter, nut_diameter):
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'''
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make one t-slot starting
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__
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-----------+ +-----+ ------
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| ^
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x center | screw_diameter x----------------------> orient
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-----------+ +-----+ ------
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--
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'''
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orient = Vec2(orient)
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out = orient / orient.norm()
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up = Vec2([out[1], -out[0]])
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center = Vec2(center)
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screw_r = screw_diameter / 2.
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nut_r = nut_diameter / 2.
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nut_w = screw_diameter
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path = Path([center + up * screw_r])
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path.append_from_last(orient)
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path.append_from_last(up * (nut_r - screw_r))
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path.append_from_last(out * (nut_w))
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path.append_from_last(-up * (nut_r - screw_r))
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path.append_from_last(out * (screw_length - thickness - orient.norm() - nut_w))
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path.append_from_last(-up * screw_r)
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path.extend(path.reflect(center, up).reverse())
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return path
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def t_slots(rx, ry, sox, soy, eox, eoy, tabVec, length, dirx, diry, isTab, do_holes):
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# root startOffset endOffset tabVec length direction isTab
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divs=int(length/nomTab) # divisions
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if not divs%2: divs-=1 # make divs odd
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divs=float(divs)
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tabs=(divs-1)/2 # tabs for side
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if equalTabs:
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gapWidth=tabWidth=length/divs
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else:
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tabWidth=nomTab
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gapWidth=(length-tabs*nomTab)/(divs-tabs)
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if isTab: # kerf correction
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gapWidth-=correction
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tabWidth+=correction
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first=correction/2
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else:
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gapWidth+=correction
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tabWidth-=correction
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first=-correction/2
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s=[]
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firstVec=0; secondVec=tabVec
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dirxN=0 if dirx else 1 # used to select operation on x or y
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diryN=0 if diry else 1
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(Vx,Vy)=(rx+sox*thickness,ry+soy*thickness)
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nut_diameter = 2 * screw_diameter
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step = Vec2([dirx * (tabWidth + gapWidth + firstVec * 2), diry * (tabWidth + gapWidth + firstVec * 2)])
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orient = Vec2([-diry * (screw_length - thickness - screw_diameter), dirx * (screw_length - thickness - screw_diameter)])
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center = Vec2(Vx + dirx * (gapWidth + tabWidth/2.), Vy + diry * (gapWidth + tabWidth/2.)) + (orient / orient.norm()) * thickness
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slot = t_slot(center, orient, screw_diameter, nut_diameter)
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hole = drill(center - (orient / orient.norm()) * (thickness * 1.5 + spacing), screw_diameter, 360)
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slots = []
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holes = []
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for i in range(0, int(divs / 2), 1):
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slots.append(slot.translate(step * i))
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if do_holes:
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holes.append(hole.translate(step * i))
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holes.append(hole.translate(step * i - orient / orient.norm() * (Z - thickness) ))
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out = [s.drawXY() for s in slots]
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out.extend([h.drawXY() for h in holes])
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return out
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def side(rx, ry, sox, soy, eox, eoy, tabVec, length, dirx, diry, isTab):
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# root startOffset endOffset tabVec length direction isTab
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divs=int(length/nomTab) # divisions
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if not divs%2: divs-=1 # make divs odd
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divs=float(divs)
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tabs=(divs-1)/2 # tabs for side
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if equalTabs:
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gapWidth=tabWidth=length/divs
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else:
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tabWidth=nomTab
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gapWidth=(length-tabs*nomTab)/(divs-tabs)
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if isTab: # kerf correction
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gapWidth-=correction
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tabWidth+=correction
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first=correction/2
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else:
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gapWidth+=correction
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tabWidth-=correction
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first=-correction/2
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firstVec=0; secondVec=tabVec
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dirxN=0 if dirx else 1 # used to select operation on x or y
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diryN=0 if diry else 1
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(Vx,Vy)=(rx+sox*thickness,ry+soy*thickness)
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s='M '+str(Vx)+','+str(Vy)+' '
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if dirxN: Vy=ry # set correct line start
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if diryN: Vx=rx
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# generate line as tab or hole using:
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# last co-ord:Vx,Vy ; tab dir:tabVec ; direction:dirx,diry ; thickness:thickness
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# divisions:divs ; gap width:gapWidth ; tab width:tabWidth
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for n in range(1,int(divs)):
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if n%2:
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Vx=Vx+dirx*gapWidth+dirxN*firstVec+first*dirx
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Vy=Vy+diry*gapWidth+diryN*firstVec+first*diry
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s+='L '+str(Vx)+','+str(Vy)+' '
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Vx=Vx+dirxN*secondVec
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Vy=Vy+diryN*secondVec
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s+='L '+str(Vx)+','+str(Vy)+' '
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else:
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Vx=Vx+dirx*tabWidth+dirxN*firstVec
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Vy=Vy+diry*tabWidth+diryN*firstVec
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s+='L '+str(Vx)+','+str(Vy)+' '
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Vx=Vx+dirxN*secondVec
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Vy=Vy+diryN*secondVec
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s+='L '+str(Vx)+','+str(Vy)+' '
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(secondVec,firstVec)=(-secondVec,-firstVec) # swap tab direction
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first=0
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s+='L '+str(rx+eox*thickness+dirx*length)+','+str(ry+eoy*thickness+diry*length)+' '
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return s
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class TSlotBoxMaker(inkex.Effect):
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def add_arguments(self, pars):
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pars.add_argument('--unit', default='mm',help='Measure Units')
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pars.add_argument('--inside',type=int, default=0, help='Int/Ext Dimension')
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pars.add_argument('--length',type=float, default=100, help='Length of Box')
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pars.add_argument('--width',type=float, default=100, help='Width of Box')
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pars.add_argument('--depth',type=float, default=100, help='Height of Box')
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pars.add_argument('--tab',type=float, default=25, help='Nominal Tab Width')
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pars.add_argument('--equal',type=int, default=0, help='Equal/Prop Tabs')
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pars.add_argument('--thickness',type=float, default=10, help='Thickness of Material')
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pars.add_argument('--kerf',type=float, default=0.5, help='Kerf (width) of cut')
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pars.add_argument('--clearance',type=float, default=0.01, help='Clearance of joints')
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pars.add_argument('--style',type=int, default=25, help='Layout/Style')
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pars.add_argument('--spacing',type=float, default=25, help='Part Spacing')
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pars.add_argument('--screw_length',type=float, default=25, help='Screw Length')
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pars.add_argument('--screw_diameter',type=float, default=25, help='Screw Diameter')
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def effect(self):
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global parent,nomTab,equalTabs,thickness,correction, screw_length, screw_diameter, spacing, Z
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# Get access to main SVG document element and get its dimensions.
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svg = self.document.getroot()
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# Get the attibutes:
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widthDoc = self.svg.unittouu(svg.get('width'))
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heightDoc = self.svg.unittouu(svg.get('height'))
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# Create a new layer.
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layer = etree.SubElement(svg, 'g')
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layer.set(inkex.addNS('label', 'inkscape'), 'T-Slot Box')
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layer.set(inkex.addNS('groupmode', 'inkscape'), 'layer')
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parent=self.svg.get_current_layer()
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# Get script's option values.
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unit=self.options.unit
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inside=self.options.inside
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X = self.svg.unittouu( str(self.options.length) + unit )
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Y = self.svg.unittouu( str(self.options.width) + unit )
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Z = self.svg.unittouu( str(self.options.depth) + unit )
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thickness = self.svg.unittouu( str(self.options.thickness) + unit )
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nomTab = self.svg.unittouu( str(self.options.tab) + unit )
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equalTabs=self.options.equal
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kerf = self.svg.unittouu( str(self.options.kerf) + unit )
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clearance = self.svg.unittouu( str(self.options.clearance) + unit )
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layout=self.options.style
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spacing = self.svg.unittouu( str(self.options.spacing) + unit )
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screw_length = self.svg.unittouu( str(self.options.screw_length) + unit )
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screw_diameter = self.svg.unittouu( str(self.options.screw_diameter) + unit )
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if inside: # if inside dimension selected correct values to outside dimension
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X+=thickness*2
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Y+=thickness*2
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Z+=thickness*2
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correction=kerf-clearance
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# check input values mainly to avoid python errors
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# TODO restrict values to *correct* solutions
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error=0
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if min(X,Y,Z)==0:
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inkex.errormsg(_('Error: Dimensions must be non zero'))
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error=1
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if max(X,Y,Z)>max(widthDoc,heightDoc)*10: # crude test
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inkex.errormsg(_('Error: Dimensions Too Large'))
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error=1
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if min(X,Y,Z)<3*nomTab:
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inkex.errormsg(_('Error: Tab size too large'))
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error=1
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if nomTab<thickness:
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inkex.errormsg(_('Error: Tab size too small'))
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error=1
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if thickness==0:
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inkex.errormsg(_('Error: Thickness is zero'))
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error=1
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if thickness>min(X,Y,Z)/3: # crude test
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inkex.errormsg(_('Error: Material too thick'))
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error=1
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if correction>min(X,Y,Z)/3: # crude test
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inkex.errormsg(_('Error: Kerf/Clearence too large'))
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error=1
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if spacing>max(X,Y,Z)*10: # crude test
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inkex.errormsg(_('Error: Spacing too large'))
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error=1
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if spacing<kerf:
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inkex.errormsg(_('Error: Spacing too small'))
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error=1
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if error: exit()
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# layout format:(rootx),(rooty),Xlength,Ylength,tabInfo
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# root= (spacing,X,Y,Z) * values in tuple
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# tabInfo= <abcd> 0=holes 1=tabs
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if layout==1: # Diagramatic Layout
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pieces=[[(2,0,0,1),(3,0,1,1),X,Z,0b1010, False, False],
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[(1,0,0,0),(2,0,0,1),Z,Y,0b1111, False, False],
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[(2,0,0,1),(2,0,0,1),X,Y,0b0000, True, True],
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[(3,1,0,1),(2,0,0,1),Z,Y,0b1111, False, False],
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[(4,1,0,2),(2,0,0,1),X,Y,0b0000, True, False],
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[(2,0,0,1),(1,0,0,0),X,Z,0b1010, False, False]]
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elif layout==2: # 3 Piece Layout
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pieces=[[(2,0,0,1),(2,0,1,0),X,Z,0b1010, False, False],
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[(1,0,0,0),(1,0,0,0),Z,Y,0b1111, False, False],
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[(2,0,0,1),(1,0,0,0),X,Y,0b0000, True, False]]
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elif layout==3: # Inline(compact) Layout
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pieces=[[(1,0,0,0),(1,0,0,0),X,Y,0b0000, False, False],
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[(2,1,0,0),(1,0,0,0),X,Y,0b0000, False, False],
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[(3,2,0,0),(1,0,0,0),Z,Y,0b0101, True, True],
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[(4,2,0,1),(1,0,0,0),Z,Y,0b0101, False, False],
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[(5,2,0,2),(1,0,0,0),X,Z,0b1111, True, False],
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[(6,3,0,2),(1,0,0,0),X,Z,0b1111, False, False]]
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elif layout==4: # Diagramatic Layout with Alternate Tab Arrangement
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pieces=[[(2,0,0,1),(3,0,1,1),X,Z,0b1001, False, False],
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[(1,0,0,0),(2,0,0,1),Z,Y,0b1100, False, False],
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[(2,0,0,1),(2,0,0,1),X,Y,0b1100, True, False],
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[(3,1,0,1),(2,0,0,1),Z,Y,0b0110, False, True],
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[(4,1,0,2),(2,0,0,1),X,Y,0b0110, True, False],
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[(2,0,0,1),(1,0,0,0),X,Z,0b1100, False, False]]
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for piece in pieces: # generate and draw each piece of the box
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(xs,xx,xy,xz)=piece[0]
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(ys,yx,yy,yz)=piece[1]
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x=xs*spacing+xx*X+xy*Y+xz*Z # root x co-ord for piece
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y=ys*spacing+yx*X+yy*Y+yz*Z # root y co-ord for piece
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dx=piece[2]
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dy=piece[3]
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tabs=piece[4]
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slots = piece[5]
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holes = piece[6]
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a=tabs>>3&1; b=tabs>>2&1; c=tabs>>1&1; d=tabs&1 # extract tab status for each side
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# generate and draw the sides of each piece
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drawS(side(x , y , d, a, -b, a, -thickness if a else thickness, dx, 1, 0, a), layer) # side a
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drawS(side(x+dx, y , -b, a, -b, -c, thickness if b else -thickness, dy, 0, 1, b), layer) # side b
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drawS(side(x+dx, y+dy, -b, -c, d, -c, thickness if c else -thickness, dx, -1, 0, c), layer) # side c
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drawS(side(x , y+dy, d, -c, d, a, -thickness if d else thickness, dy, 0, -1, d), layer) # side d
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# side((rx,ry),(sox,soy),(eox,eoy),tabVec,length,(dirx,diry),isTab):
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# root startOffset endOffset tabVec length direction isTab
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if slots:
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[drawS(slot, layer) for slot in t_slots(x , y , d, a, -b, a, -thickness if a else thickness, dx, 1, 0, a, holes)] # slot a
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[drawS(slot, layer) for slot in t_slots(x+dx, y , -b, a, -b, -c, thickness if b else -thickness, dy, 0, 1, b, holes)] # slot b
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[drawS(slot, layer) for slot in t_slots(x+dx, y+dy , -b, -c, d, -c, thickness if c else -thickness, dx, -1, 0, c, holes)] # slot c
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[drawS(slot, layer) for slot in t_slots(x , y+dy , d, -c, d, a, -thickness if d else thickness, dy, 0, -1, d, holes)] # slot d
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# Create effect instance and apply it.
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TSlotBoxMaker().run()
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