2020-07-30 01:16:18 +02:00
|
|
|
#!/usr/bin/env python3
|
|
|
|
|
#
|
|
|
|
|
# Copyright (C) 2016 Kie Brooks
|
|
|
|
|
# Distributed under GPLv3 or later.
|
|
|
|
|
# draw_ratchet
|
|
|
|
|
# version 0.1
|
|
|
|
|
#
|
|
|
|
|
# This file is part of draw_ratchet
|
|
|
|
|
#
|
|
|
|
|
# draw_ratchet 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 3 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.
|
|
|
|
|
#
|
|
|
|
|
# You should have received a copy of the GNU General Public License
|
|
|
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
|
#
|
|
|
|
|
#
|
|
|
|
|
# description :
|
|
|
|
|
# draw ratchet gears to arbitrary sizes and precision
|
|
|
|
|
#
|
|
|
|
|
# I am not an engineer, I am sure this little program could be improved or made much more complex,
|
|
|
|
|
# it may contain horrible flaws but it fills my current need and should be easy to improve on.
|
|
|
|
|
# Alternatively pay me some money and I might do it for you ;P
|
|
|
|
|
#
|
|
|
|
|
# This program is used by inkscape.
|
|
|
|
|
# It can be found in the menu : extensions -> render -> ratchet
|
|
|
|
|
# see file draw_ratch.inx
|
|
|
|
|
# (directory ~/.config/inkscape/extensions/)
|
|
|
|
|
|
|
|
|
|
import inkex
|
|
|
|
|
import math
|
|
|
|
|
from lxml import etree
|
|
|
|
|
|
|
|
|
|
def draw_SVG_circle(parent, r, cx, cy, name, style):
|
|
|
|
|
" structure an SVG circle entity under parent "
|
|
|
|
|
circ_attribs = {'style': str(inkex.Style(style)),
|
|
|
|
|
'cx': str(cx), 'cy': str(cy),
|
|
|
|
|
'r': str(r),
|
|
|
|
|
inkex.addNS('label','inkscape'): name}
|
|
|
|
|
circle = etree.SubElement(parent, inkex.addNS('circle','svg'), circ_attribs )
|
|
|
|
|
|
|
|
|
|
class Ratchet(inkex.Effect):
|
|
|
|
|
|
|
|
|
|
def __init__(self):
|
|
|
|
|
inkex.Effect.__init__(self)
|
|
|
|
|
self.arg_parser.add_argument("--centre_hole", type=inkex.Boolean, default=True, help="Show or not")
|
|
|
|
|
self.arg_parser.add_argument("--teeth", type=int, default=12, help="Number of teeth around outside")
|
|
|
|
|
self.arg_parser.add_argument("--centre_hole_diam", type=float, default=1, help="Dia of central hole")
|
|
|
|
|
self.arg_parser.add_argument("--diam_in", type=float, default=28, help="Inner diamter of the Ratchet")
|
|
|
|
|
self.arg_parser.add_argument("--diam_out", type=float, default=30, help="Outer diamter of the Ratchet")
|
|
|
|
|
self.arg_parser.add_argument('--vtooth_shape', default='straight', help="Shape of tooth")
|
|
|
|
|
self.arg_parser.add_argument('--htooth_shape', default='curve', help="Shape of tooth")
|
|
|
|
|
|
|
|
|
|
def effect(self):
|
2020-07-30 02:35:26 +02:00
|
|
|
Line_style = {'stroke':'#000000','stroke-width':self.svg.unittouu(str(0.1) + "mm"),'fill':'none'}
|
2020-07-30 01:16:18 +02:00
|
|
|
# sort out the options
|
|
|
|
|
teeth = self.options.teeth
|
|
|
|
|
diam_in = self.options.diam_in
|
|
|
|
|
diam_out = self.options.diam_out
|
|
|
|
|
vtooth_shape = self.options.vtooth_shape
|
|
|
|
|
htooth_shape = self.options.htooth_shape
|
|
|
|
|
# Create group center of view
|
|
|
|
|
t = 'translate(%s,%s)' % (self.svg.namedview.center[0], self.svg.namedview.center[1])
|
|
|
|
|
grp_attribs = {inkex.addNS('label','inkscape'):'Ratchet', 'transform':t}
|
|
|
|
|
grp = etree.SubElement(self.svg.get_current_layer(), 'g', grp_attribs)
|
|
|
|
|
#
|
|
|
|
|
# Central hole (at origin)
|
|
|
|
|
if self.options.centre_hole:
|
|
|
|
|
draw_SVG_circle(grp, self.options.centre_hole_diam, 0,0, 'Central_hole', Line_style)
|
|
|
|
|
#Polygon drawing
|
|
|
|
|
# <path d="M50,50 A30,50 0 0,1 100,100"
|
|
|
|
|
# style="stroke:#660000; fill:none;"/>
|
|
|
|
|
# L - line : x posn, y posn
|
|
|
|
|
# A - arc : radius x, radius y, x-axis rotation, large arc flag, sweep flag
|
|
|
|
|
# Points on the ratchet
|
|
|
|
|
# b
|
|
|
|
|
# |\
|
|
|
|
|
# | \ |\
|
|
|
|
|
# \ | \ | \
|
|
|
|
|
# \ | \| \
|
|
|
|
|
# a c \
|
|
|
|
|
path = "M%s %s " %(diam_in,0)
|
|
|
|
|
for i in range(teeth):
|
|
|
|
|
angle = math.radians(i * 360/ teeth)
|
|
|
|
|
x_a = diam_in * math.cos(angle)
|
|
|
|
|
y_a = diam_in * math.sin(angle)
|
|
|
|
|
x_b = diam_out * math.cos(angle)
|
|
|
|
|
y_b = diam_out * math.sin(angle)
|
|
|
|
|
if vtooth_shape == "straight":
|
|
|
|
|
path += ' L %s %s ' %(x_b, y_b)
|
|
|
|
|
else:
|
|
|
|
|
path += " A %s,%s 0 0 0 %s %s" % (diam_in, diam_in, x_b, y_b)
|
|
|
|
|
#
|
|
|
|
|
angle_next = math.radians((i+1) * 360 / teeth)
|
|
|
|
|
x_c = diam_in * math.cos(angle_next)
|
|
|
|
|
y_c = diam_in * math.sin(angle_next)
|
|
|
|
|
if htooth_shape == "straight":
|
|
|
|
|
path += ' L %s %s ' %(x_c, y_c)
|
|
|
|
|
else: # Arc
|
|
|
|
|
path += " A %s,%s 0 0 1 %s %s" % (diam_in, diam_in, x_c, y_c)
|
|
|
|
|
# close path
|
|
|
|
|
path += 'z'
|
|
|
|
|
# draw it
|
|
|
|
|
line_attribs = {'style' : str(inkex.Style(Line_style)), inkex.addNS('label','inkscape') : 'Cone' }
|
|
|
|
|
line_attribs['d'] = path
|
|
|
|
|
etree.SubElement(grp, inkex.addNS('path','svg'), line_attribs )
|
|
|
|
|
|
|
|
|
|
if __name__ == "__main__":
|
|
|
|
|
Ratchet().run()
|
