From 35a96bde514a8897f6f0fcc41c5833bf63df2e2a Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 18:29:01 +0200
Subject: Adding upstream version 1.0.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 share/extensions/render_gear_rack.py | 81 ++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100755 share/extensions/render_gear_rack.py

(limited to 'share/extensions/render_gear_rack.py')

diff --git a/share/extensions/render_gear_rack.py b/share/extensions/render_gear_rack.py
new file mode 100755
index 0000000..201df6f
--- /dev/null
+++ b/share/extensions/render_gear_rack.py
@@ -0,0 +1,81 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2013 Brett Graham (hahahaha @ hahaha.org)
+#
+# This program 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 2 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+"""
+Generate a gear rack as SVG.
+"""
+
+from math import acos, cos, radians, sin, sqrt, tan
+
+import inkex
+
+def involute_intersect_angle(Rb, R):
+    Rb, R = float(Rb), float(R)
+    return (sqrt(R ** 2 - Rb ** 2) / Rb) - (acos(Rb / R))
+
+
+def point_on_circle(radius, angle):
+    x = radius * cos(angle)
+    y = radius * sin(angle)
+    return x, y
+
+
+def points_to_svgd(p):
+    """
+    p: list of 2 tuples (x, y coordinates)
+    """
+    f = p[0]
+    p = p[1:]
+    svgd = 'M{:.3f},{:.3f}'.format(f[0], f[1])
+    for x in p:
+        svgd += 'L{:.3f},{:.3f}'.format(x[0], x[1])
+    return svgd
+
+
+class RackGear(inkex.GenerateExtension):
+    container_label = 'Rendered Gear Rack'
+    def add_arguments(self, pars):
+        pars.add_argument("--length", type=float, default=100.0, help="Rack Length")
+        pars.add_argument("--spacing", type=float, default=10.0, help="Tooth Spacing")
+        pars.add_argument("--angle", type=float, default=20.0, help="Contact Angle")
+
+    def generate(self):
+        length = self.svg.unittouu(str(self.options.length) + 'px')
+        spacing = self.svg.unittouu(str(self.options.spacing) + 'px')
+        angle = radians(self.options.angle)
+
+        # generate points: list of (x, y) pairs
+        points = []
+        x = 0
+        tas = tan(angle) * spacing
+        while x < length:
+            # move along path, generating the next 'tooth'
+            points.append((x, 0))
+            points.append((x + tas, spacing))
+            points.append((x + spacing, spacing))
+            points.append((x + spacing + tas, 0))
+            x += spacing * 2.
+
+        path = points_to_svgd(points)
+
+        # Create SVG Path for gear
+        style = {'stroke': '#000000', 'fill': 'none', 'stroke-width': str(self.svg.unittouu('1px'))}
+        yield inkex.PathElement(style=str(inkex.Style(style)), d=str(path))
+
+if __name__ == '__main__':
+    RackGear().run()
-- 
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