From 88aa2da2a7286797ebec9b83b8ce7e72a3279439 Mon Sep 17 00:00:00 2001
From: Jan Huwald <jh@sotun.de>
Date: Wed, 26 Feb 2014 10:48:12 +0100
Subject: improve strut layout


diff --git a/con_bar_v.scad b/con_bar_v.scad
index 1706fb9..6ef6ec2 100644
--- a/con_bar_v.scad
+++ b/con_bar_v.scad
@@ -1,4 +1,4 @@
-bar_width = 3;
+bar_width = 4;
 bar_height = 20;
 
 clamp_thick = 5;
@@ -6,12 +6,24 @@ clamp_l1 = 10;
 clamp_l2 = 50;
 
 strut_height = bar_height;
+strut_thick = 3;
 
 angle = 30; // fake value; TODO
 
 clamp_width = 2 * clamp_thick + bar_width;
 clamp_height = bar_height + clamp_thick;
 
+module strut(num, r1, r2, h) {
+ a = 360 / num;
+ b = a - 90;
+ d = clamp_width/2;
+
+ linear_extrude(h) polygon([
+   [r1, d], [r2, d],
+   [cos(a)*r2 + cos(b)*d, sin(a)*r2 + sin(b)*d],
+   [cos(a)*r1 + cos(b)*d, sin(a)*r1 + sin(b)*d]]);
+}
+
 module clamp() {
   l = clamp_l2 - clamp_l1;
 
@@ -26,25 +38,13 @@ module clamp() {
 }
 
 module con(num) {
-  difference() {
-    for (dist = [clamp_l1 + 2*clamp_thick, clamp_l2])
-      assign(l = 2 * dist * sin(180/num) + 2*clamp_thick)
-      for (i = [1:num])
-        rotate(i*360/num)
-        translate([dist, -clamp_thick, 0])
-	rotate(180/num)
-	translate([0, 0, 0])
-        cube([clamp_thick, l, strut_height]);
-    for (i = [1:num])
-      rotate(i*360/num)
-      translate([0, -clamp_width/2, 0])
-      cube([2*clamp_l2, clamp_width, clamp_height]);
-  }
-
-  for (i = [1:num])
-    rotate(i*360/num)
-    clamp();
+  for (i = [0:num-1])
+    rotate(i*360/num) {
+      clamp();
+      strut(num, clamp_l1, clamp_l1 + strut_thick, strut_height);
+      strut(num, clamp_l2, clamp_l2 - strut_height, strut_thick);
+      strut(num, clamp_l2, clamp_l2 - strut_thick, strut_height);
+    }
 }
 
-con(5);
-//clamp();
\ No newline at end of file
+con(3);
-- 
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