ce73efc40e53170d5ebd6de7102c6d718083e456Krzysztof Kosiński#!/usr/bin/env python
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens'''
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin OwensCopyright (C) 2013 Brett Graham (hahahaha @ hahaha.org)
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin OwensThis program is free software; you can redistribute it and/or modify
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensit under the terms of the GNU General Public License as published by
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensthe Free Software Foundation; either version 2 of the License, or
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens(at your option) any later version.
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin OwensThis program is distributed in the hope that it will be useful,
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensbut WITHOUT ANY WARRANTY; without even the implied warranty of
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin OwensMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin OwensGNU General Public License for more details.
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin OwensYou should have received a copy of the GNU General Public License
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensalong with this program; if not, write to the Free Software
107e00c8104649437b9520d0ba298dba659e7cd7JazzyNicoFoundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens'''
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensimport inkex
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensimport simplestyle
34401423d53f5ca799a8bda956328167fadcc58b~suvfrom simpletransform import computePointInNode
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensfrom math import *
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensdef involute_intersect_angle(Rb, R):
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens Rb, R = float(Rb), float(R)
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens return (sqrt(R**2 - Rb**2) / (Rb)) - (acos(Rb / R))
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensdef point_on_circle(radius, angle):
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens x = radius * cos(angle)
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens y = radius * sin(angle)
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens return (x, y)
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensdef points_to_svgd(p):
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens """
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens p: list of 2 tuples (x, y coordinates)
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens """
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens f = p[0]
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens p = p[1:]
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens svgd = 'M%.3f,%.3f' % f
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens for x in p:
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens svgd += 'L%.3f,%.3f' % x
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens return svgd
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensclass RackGear(inkex.Effect):
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens def __init__(self):
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens inkex.Effect.__init__(self)
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens self.OptionParser.add_option(
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens "-l", "--length",
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens action="store", type="float",
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens dest="length", default=100.,
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens help="Rack Length")
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens self.OptionParser.add_option(
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens "-s", "--spacing",
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens action="store", type="float",
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens dest="spacing", default=10.,
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens help="Tooth Spacing")
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens self.OptionParser.add_option(
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens "-a", "--angle",
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens action="store", type="float",
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens dest="angle", default=20.,
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens help="Contact Angle")
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens def effect(self):
499a62b46139de464af5bf312ef9221f3d8889f1apenner length = self.unittouu(str(self.options.length) + 'px')
499a62b46139de464af5bf312ef9221f3d8889f1apenner spacing = self.unittouu(str(self.options.spacing) + 'px')
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens angle = radians(self.options.angle)
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens # generate points: list of (x, y) pairs
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens points = []
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens x = 0
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens tas = tan(angle) * spacing
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens while x < length:
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens # move along path, generating the next 'tooth'
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens points.append((x, 0))
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens points.append((x + tas, spacing))
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens points.append((x + spacing, spacing))
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens points.append((x + spacing + tas, 0))
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens x += spacing * 2.
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens path = points_to_svgd(points)
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens # Embed gear in group to make animation easier:
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens # Translate group, Rotate path.
34401423d53f5ca799a8bda956328167fadcc58b~suv view_center = computePointInNode(list(self.view_center), self.current_layer)
34401423d53f5ca799a8bda956328167fadcc58b~suv t = 'translate(' + str(view_center[0]) + ',' + \
34401423d53f5ca799a8bda956328167fadcc58b~suv str(view_center[1]) + ')'
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens g_attribs = {
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens inkex.addNS('label', 'inkscape'): 'RackGear' + str(length),
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens 'transform': t}
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens g = inkex.etree.SubElement(self.current_layer, 'g', g_attribs)
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens # Create SVG Path for gear
499a62b46139de464af5bf312ef9221f3d8889f1apenner style = {'stroke': '#000000', 'fill': 'none', 'stroke-width': str(self.unittouu('1px'))}
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens gear_attribs = {
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens 'style': simplestyle.formatStyle(style),
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens 'd': path}
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens gear = inkex.etree.SubElement(
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens g, inkex.addNS('path', 'svg'), gear_attribs)
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owensif __name__ == '__main__':
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens e = RackGear()
edee13f2ac1205fb2d9ccc42a40c8c3657154c3cMartin Owens e.affect()