added polygon side extension
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extensions/fablabchemnitz/polygon_side/polygon_side.inx
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extensions/fablabchemnitz/polygon_side/polygon_side.inx
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<?xml version="1.0" encoding="UTF-8"?>
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<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
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<name>Polygon Side</name>
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<id>fablabchemnitz.de.polygon_side</id>
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<param name="number_of_sides" type="int" min="1" max="100" gui-text="Number of Sides">3</param>
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<param name="length_of_sides" type="float" min="0.01" max="9999" gui-text="Length of Sides">25</param>
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<param name="unit_choice" type="optiongroup" appearance="radio" gui-text="Units">
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<option value="1">User</option>
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<option value="2">Pixels</option>
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</param>
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<effect>
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<object-type>path</object-type>
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<effects-menu>
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<submenu name="FabLab Chemnitz">
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<submenu name="Shape/Pattern from Generator"/>
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</submenu>
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</effects-menu>
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</effect>
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<script>
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<command location="inx" interpreter="python">polygon_side.py</command>
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</script>
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</inkscape-extension>
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extensions/fablabchemnitz/polygon_side/polygon_side.py
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extensions/fablabchemnitz/polygon_side/polygon_side.py
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#!/usr/bin/env python3
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#
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# Copyright (C) [2021] [Matt Cottam], [mpcottam@raincloud.co.uk]
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#
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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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#
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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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#
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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, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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#
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# Create a Polygon given a number of sides and side length.
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#
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import math
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import inkex
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from inkex import PathElement
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from inkex import units
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import re
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# Formula to find the circumradius ( centre to apex ) required to create
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# for a given number of sectors to return desired side length
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def radius_from_side_and_sectors(side_length, sectors, found_units, unit_choice):
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conversions = {
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'in': 96.0,
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'pt': 1.3333333333333333,
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'px': 1.0,
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'mm': 3.779527559055118,
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'cm': 37.79527559055118,
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'm': 3779.527559055118,
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'km': 3779527.559055118,
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'Q': 0.94488188976378,
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'pc': 16.0,
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'yd': 3456.0,
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'ft': 1152.0,
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'': 1.0, # Default px
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}
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# Try to convert from detected units into pixels
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if unit_choice == 2:
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try:
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pixel_conversion_factor = conversions[found_units]
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except:
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pixel_conversion_factor = 1
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else:
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pixel_conversion_factor = 1
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radius = (side_length / (2 * (math.sin(math.pi / sectors)))) / pixel_conversion_factor
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path = svg_poly(0, 0, radius, sectors)
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return path
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# All points of a regular polygon lie on a circle
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# Calculate points on circle for given number of sides
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def svg_poly(cx, cy, radius, sectors):
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x_start = cx
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y_start = cy - radius
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angle = 0
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y_start = cy / 2 + (radius * (math.sin(angle)))
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x_start = cx / 2 + (radius * (math.cos(angle)))
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path = f'M {x_start} {y_start}'
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for sector in range(1, sectors + 1):
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angle = (sector * math.pi) / (sectors / 2)
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y = cy / 2 + (radius * (math.sin(angle)))
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x = cx / 2 + (radius * (math.cos(angle)))
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path = path + f' L {x} {y} '
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x_start = x
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y_start = y
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return path + ' z'
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class makepoly(inkex.GenerateExtension):
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def add_arguments(self, pars):
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pars.add_argument("--number_of_sides", type=int, dest="sectors", default=6)
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pars.add_argument("--length_of_sides", type=float, dest="side_length", default=25)
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pars.add_argument("--unit_choice", type=int, dest="unit_choice", default=25)
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container_label = 'Side Poly'
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def generate(self):
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found_units = self.svg.unit
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path = radius_from_side_and_sectors(self.options.side_length, self.options.sectors, found_units,
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self.options.unit_choice)
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style = {'stroke': '#000000', 'fill': 'none', 'stroke-width': str(self.svg.unittouu('1px'))}
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poly_path = PathElement()
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poly_path.style = style
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poly_path.path = path
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yield poly_path
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if __name__ == '__main__':
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makepoly().run()
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