Adding upstream version 1.0.2.upstream/1.0.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 102 insertions, 0 deletions

diff --git a/share/extensions/spirograph.py b/share/extensions/spirograph.py
new file mode 100755
index 0000000..5d7dcf4
--- /dev/null
+++ b/share/extensions/spirograph.py
@@ -0,0 +1,102 @@
+#! /usr/bin/env python
+# coding=utf-8
+#
+# Copyright (C) 2007 Joel Holdsworth joel@airwebreathe.org.uk
+#
+# 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.
+#
+
+import math
+import inkex
+
+class Spirograph(inkex.EffectExtension):
+    def add_arguments(self, pars):
+        pars.add_argument("--primaryr", type=float, default=60.0,
+                          help="The radius of the outer gear")
+        pars.add_argument("--secondaryr", type=float, default=100.0,
+                          help="The radius of the inner gear")
+        pars.add_argument("--penr", type=float, default=50.0,
+                          help="The distance of the pen from the inner gear")
+        pars.add_argument("--gearplacement", default="inside",
+                          help="Selects whether the gear is inside or outside the ring")
+        pars.add_argument("--rotation", type=float, default=0.0,
+                          help="The number of degrees to rotate the image by")
+        pars.add_argument("--quality", type=int, default=16,
+                          help="The quality of the calculated output")
+
+    def effect(self):
+        self.options.primaryr = self.svg.unittouu(str(self.options.primaryr) + 'px')
+        self.options.secondaryr = self.svg.unittouu(str(self.options.secondaryr) + 'px')
+        self.options.penr = self.svg.unittouu(str(self.options.penr) + 'px')
+
+        if self.options.secondaryr == 0:
+            return
+        if self.options.quality == 0:
+            return
+
+        if self.options.gearplacement.strip(' ').lower().startswith('outside'):
+            a = self.options.primaryr + self.options.secondaryr
+            flip = -1
+        else:
+            a = self.options.primaryr - self.options.secondaryr
+            flip = 1
+
+        ratio = a / self.options.secondaryr
+        if ratio == 0:
+            return
+        scale = 2 * math.pi / (ratio * self.options.quality)
+
+        rotation = - math.pi * self.options.rotation / 180
+
+        new = inkex.PathElement()
+        new.style = inkex.Style(stroke='#000000', fill='none', stroke_width='1.0')
+
+        path_string = ''
+        maxPointCount = 1000
+
+        for i in range(maxPointCount):
+
+            theta = i * scale
+
+            view_center = self.svg.namedview.center
+            x = a * math.cos(theta + rotation) + \
+                self.options.penr * math.cos(ratio * theta + rotation) * flip + \
+                view_center[0]
+            y = a * math.sin(theta + rotation) - \
+                self.options.penr * math.sin(ratio * theta + rotation) + \
+                view_center[1]
+
+            dx = (-a * math.sin(theta + rotation) - ratio * self.options.penr * math.sin(ratio * theta + rotation) * flip) * scale / 3
+            dy = (a * math.cos(theta + rotation) - ratio * self.options.penr * math.cos(ratio * theta + rotation)) * scale / 3
+
+            if i <= 0:
+                path_string += 'M {},{} C {},{} '.format(str(x), str(y), str(x + dx), str(y + dy))
+            else:
+                path_string += '{},{} {},{}'.format(str(x - dx), str(y - dy), str(x), str(y))
+
+                if math.fmod(i / ratio, self.options.quality) == 0 and i % self.options.quality == 0:
+                    path_string += 'Z'
+                    break
+                else:
+                    if i == maxPointCount - 1:
+                        pass  # we reached the allowed maximum of points, stop here
+                    else:
+                        path_string += ' C {},{} '.format(str(x + dx), str(y + dy))
+
+        new.path = path_string
+        self.svg.get_current_layer().append(new)
+
+if __name__ == '__main__':
+    Spirograph().run()