From e54fafdcfcfd2947fcd96a7d1e392be573ae2edb Mon Sep 17 00:00:00 2001
From: Elena ``of Valhalla'' Grandi <valhalla@trueelena.org>
Date: Wed, 16 Aug 2023 19:38:46 +0200
Subject: Script to generate a fan pattern

---
 source/misc/index.rst                              |  12 +++
 source/misc/unclassified/index.rst                 |  13 +++
 source/misc/unclassified/paper_covered_fan/fan.py  | 118 +++++++++++++++++++++
 .../misc/unclassified/paper_covered_fan/index.rst  |  26 +++++
 4 files changed, 169 insertions(+)
 create mode 100644 source/misc/index.rst
 create mode 100644 source/misc/unclassified/index.rst
 create mode 100755 source/misc/unclassified/paper_covered_fan/fan.py
 create mode 100644 source/misc/unclassified/paper_covered_fan/index.rst

diff --git a/source/misc/index.rst b/source/misc/index.rst
new file mode 100644
index 0000000..ada75e8
--- /dev/null
+++ b/source/misc/index.rst
@@ -0,0 +1,12 @@
+###############
+ Miscellaneous
+###############
+
+Various things that had no place elsewhere.
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+   unclassified/index
+
diff --git a/source/misc/unclassified/index.rst b/source/misc/unclassified/index.rst
new file mode 100644
index 0000000..8a3ccdd
--- /dev/null
+++ b/source/misc/unclassified/index.rst
@@ -0,0 +1,13 @@
+**************
+ Unclassified
+**************
+
+Things in this chapter may be moved elsewhere if a more suitable
+chapter is addded.
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+   paper_covered_fan/index
+
diff --git a/source/misc/unclassified/paper_covered_fan/fan.py b/source/misc/unclassified/paper_covered_fan/fan.py
new file mode 100755
index 0000000..e50ac75
--- /dev/null
+++ b/source/misc/unclassified/paper_covered_fan/fan.py
@@ -0,0 +1,118 @@
+#!/usr/bin/env python3
+
+import math
+
+import hazwaz
+import svgwrite
+
+
+# 1 cm in px
+cm = 37.795276
+
+LINE_STYLE = {
+    'stroke': svgwrite.utils.rgb(0, 0, 0),
+    'stroke_width': 0.5,
+    'fill': 'none'
+    }
+
+FOLD_LINE_STYLE = {
+    'stroke': svgwrite.utils.rgb(0, 0, 0),
+    'stroke_width': 0.5,
+    'fill': 'none',
+    'stroke-dasharray': "5,5",
+    }
+
+class Fan(hazwaz.MainCommand):
+    """
+    Draw a fan cover
+    """
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            "-o", "--outer_radius",
+            type=float,
+            default=25.0,
+            help="Outer radius of the fan sticks (cm)",
+        )
+        parser.add_argument(
+            "-i", "--inner_radius",
+            type=float,
+            default=10.0,
+            help="Outer radius of the fan sticks (cm)",
+        )
+        parser.add_argument(
+            "-w", "--folded_width",
+            type=float,
+            default=2.0,
+            help="Width of the outer sticks (and folded fan) at the top",
+        )
+        parser.add_argument(
+            "-s", "--sticks",
+            type=int,
+            default=12,
+            help="Number of sticks (excluding the outer ones)."
+        )
+
+    def main(self):
+        self.sections = self.args.sticks * 2 + 3
+        self.alpha = self.args.folded_width / self.args.outer_radius
+        self.angle = self.alpha * self.sections
+
+        size = str(self.args.outer_radius * 2 + 2) + "cm"
+        dest = dest = svgwrite.Drawing(
+            filename="fan.svg",
+            size=(size, size),
+            profile="full",
+        )
+        fan = self.draw_fan(dest)
+        dest.save()
+
+    def draw_fan(self, dest):
+        c = (self.args.outer_radius + 1 )* cm
+        a = self.alpha
+        r_o = self.args.outer_radius
+        r_i = self.args.inner_radius
+
+        grp = dest.g()
+        grp.add(dest.circle(
+            center=(c, c),
+            r=r_o * cm,
+            ** LINE_STYLE
+        ))
+        grp.add(dest.circle(
+            center=(c, c),
+            r=r_i * cm,
+            ** LINE_STYLE
+        ))
+        grp.add(dest.line(
+            start=(c + r_i * cm, c),
+            end=(c + r_o * cm, c),
+            ** LINE_STYLE
+        ))
+        for i in range(1, self.sections):
+            grp.add(dest.line(
+                start=(
+                    c + (math.cos(a * - i) * r_i) * cm,
+                    c + (math.sin(a * - i) * r_i) * cm
+                ),
+                end=(
+                    c + (math.cos(a * - i) * r_o) * cm,
+                    c + (math.sin(a * - i) * r_o) * cm
+                ),
+                ** FOLD_LINE_STYLE
+            ))
+        grp.add(dest.line(
+                start=(
+                    c + (math.cos(a * - self.sections) * r_i) * cm,
+                    c + (math.sin(a * - self.sections) * r_i) * cm
+                ),
+                end=(
+                    c + (math.cos(a * - self.sections) * r_o) * cm,
+                    c + (math.sin(a * - self.sections) * r_o) * cm
+                ),
+            ** LINE_STYLE
+        ))
+        dest.add(grp)
+
+if __name__ == "__main__":
+    Fan().run()
diff --git a/source/misc/unclassified/paper_covered_fan/index.rst b/source/misc/unclassified/paper_covered_fan/index.rst
new file mode 100644
index 0000000..83e7af1
--- /dev/null
+++ b/source/misc/unclassified/paper_covered_fan/index.rst
@@ -0,0 +1,26 @@
+Paper Covered Fan
+=================
+
+.. figure:: 
+   :align: center
+
+.. only:: html
+
+   .. contents::
+
+
+Materials
+---------
+
+You need:
+
+* A fan 
+
+
+Instructions
+------------
+
+
+See also
+--------
+
-- 
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