From d54c8edf3430f88517c17213e2accfc6d856bcf0 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Fri, 12 Feb 2016 00:11:26 +0000
Subject: [PATCH] wardrobe-hook: Break out FArcSegment and FArcSegment_mask
 into utils (nfc)

---
 utils.scad         | 26 ++++++++++++++++++++++++++
 wardrobe-hook.scad | 24 +-----------------------
 2 files changed, 27 insertions(+), 23 deletions(-)
 create mode 100644 utils.scad

diff --git a/utils.scad b/utils.scad
new file mode 100644
index 0000000..5234d51
--- /dev/null
+++ b/utils.scad
@@ -0,0 +1,26 @@
+// -*- C -*-
+
+// suitable for masking things within radius sqrt(2) only
+module FArcSegment_mask(beta) {
+  for (i=[0 : 0.75 : 3]) {
+    rotate(i*beta/4)
+      polygon([[0, 0],
+	       [1, 0],
+	       [cos(beta/4), sin(beta/4)]]);
+  }
+}
+
+module FArcSegment(xc,yc,inrad,outrad,alpha,delta) {
+  translate([xc,yc]) {
+    intersection() {
+      difference() {
+	circle(r=outrad, $fn=70);
+	circle(r=inrad, $fn=70);
+      }
+      rotate(alpha) scale(outrad*2) {
+	FArcSegment_mask(delta);
+      }
+    }
+  }
+}
+
diff --git a/wardrobe-hook.scad b/wardrobe-hook.scad
index d7c070c..959e967 100644
--- a/wardrobe-hook.scad
+++ b/wardrobe-hook.scad
@@ -1,29 +1,7 @@
 // -*- C -*-
 
 include <funcs.scad>
-
-module FArcSegment_mask(beta) {
-  for (i=[0 : 0.75 : 3]) {
-    rotate(i*beta/4)
-      polygon([[0, 0],
-	       [1, 0],
-	       [cos(beta/4), sin(beta/4)]]);
-  }
-}
-
-module FArcSegment(xc,yc,inrad,outrad,alpha,delta) {
-  translate([xc,yc]) {
-    intersection() {
-      difference() {
-	circle(r=outrad, $fn=70);
-	circle(r=inrad, $fn=70);
-      }
-      rotate(alpha) scale(outrad*2) {
-	FArcSegment_mask(delta);
-      }
-    }
-  }
-}
+include <utils.scad>
 
 tubeslop = 0.5;
 tubeheight = 30 + tubeslop;
-- 
2.30.2