From 9cceb044d036c37c8c8703926c9c84d1d88cc2e0 Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Thu, 21 Jul 2016 16:10:58 +0000
Subject: ductshape generator

---
diff --git a/fanduct.scad b/fanduct.scad
index a17b261..ba63717 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -50,35 +50,37 @@ dual_spots = [ [+space_behind_nozzle, -(to_midduct+nozzles_apart/2)],
 
 module fanduct(type=type,ductshape=ductshape,dual=dual) {
  //	***	duct is all around!
+
  module duct(what) {
+  module ductshape(what,sh,sv,r) {
+   smax = max(sh,sv);
+   translate([what=="in"?0:fanduct_shell,what=="in"?0:fanduct_shell])
+   if(ductshape=="round") {
+    translate([sh/2+r,sv/2])
+    scale([sh/smax,sv/smax])
+    circle(d=smax,$fn=4*smax);
+   }else if(ductshape=="square") {
+    translate([r,0])
+    if(what=="in")
+     square([sh,sv]);
+    else if(what=="out") union() {
+     square([sh,sv/2]);
+     translate([sh/2,sv/2])
+     scale([sh/smax,sv/smax])
+     circle(d=smax,$fn=4*smax);
+    }
+   }
+  }
   module single() {
    if(what=="in") {
     sh = fanduct_w+2*fanduct_shell; sv = fanduct_h+2*fanduct_shell;
-    smax = max(sh,sv);
     rotate_extrude($fn=smooth_f)
-     if(ductshape=="round")
-      translate([sh/2+fanduct_ir,sv/2])
-      scale([sh/smax,sv/smax])
-      circle(d=smax,$fn=4*smax);
-     else if(ductshape=="square")
-      translate([fanduct_ir,0])
-      square([sh,sv]);
+    ductshape(what=what,sh=sh,sv=sv,r=fanduct_ir);
    }else if(what=="out") {
     sh = fanduct_w; sv = fanduct_h;
     smax = max(sh,sv);
     rotate_extrude($fn=smooth_f)
-     if(ductshape=="round")
-      translate([sh/2+fanduct_shell+fanduct_ir,sv/2+fanduct_shell])
-      scale([sh/smax,sv/smax])
-      circle(d=smax,$fn=4*smax);
-     else if(ductshape=="square")
-      translate([fanduct_ir+fanduct_shell,fanduct_shell])
-      union() {
-       square([sh,sv/2]);
-       translate([sh/2,sv/2])
-       scale([sh/smax,sv/smax])
-       circle(d=smax,$fn=36);
-      }
+    ductshape(what=what,sh=sh,sv=sv,r=fanduct_ir);
    }
   }
   module dual() {
--
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