From 1e024a80ef18fd8f0aac56a94634d6a2319966b6 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Mon, 2 Jan 2017 14:40:31 +0000
Subject: [PATCH] sewing-table: Introduce InterlockEdge

---
 sewing-table.scad.m4 | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sewing-table.scad.m4 b/sewing-table.scad.m4
index dd3f0f1..38638ac 100644
--- a/sewing-table.scad.m4
+++ b/sewing-table.scad.m4
@@ -157,6 +157,16 @@ module InterlockLobe(this_cnr, right_cnr, negative=0) {
     InterlockLobeCore(negative);
 }
 
+module InterlockEdge(left_cnr, right_cnr, negative=0, nlobes=2) {
+  INREFFRAME(left_cnr, right_cnr) {
+    for (lobei = [ 0 : nlobes-1 ]) {
+      lobex = (length - thehd[0]*2) * lobei / (nlobes-1);
+      translate([lobex, 0, 0])
+	InterlockLobeCore(negative);
+    }
+  }
+}
+
 function TestPiece_holes2corners(holes) =
   [ holes[0] + thehd_bl,
     holes[1] + thehd_br,
@@ -221,6 +231,7 @@ module Tile02(){ ////toplevel
   RoundEdge(c[0], c[1]);
   RoundEdge(c[3], c[0]);
   RoundLeftCorner(c[0], c[1]);
+  InterlockEdge(c[2], c[3], 0, 2);
 }
 
 module Tile12(){ ////toplevel
-- 
2.30.2