From dbf510bd4e1b6ac313c38895b97179656cb38e6b Mon Sep 17 00:00:00 2001
From: Justin Lin <justin.sdk@gmail.com>
Date: Mon, 25 Jan 2021 15:47:39 +0800
Subject: [PATCH] add comment

---
 src/experimental/2_edge_wang_tiles.scad | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/experimental/2_edge_wang_tiles.scad b/src/experimental/2_edge_wang_tiles.scad
index 3bc12fb4..8340527f 100644
--- a/src/experimental/2_edge_wang_tiles.scad
+++ b/src/experimental/2_edge_wang_tiles.scad
@@ -23,6 +23,14 @@ module 2_edge_wang_tiles(rows, columns, tile_width, mask, seed) {
 		    [for(x = [0:columns - 1]) mask[y][x]]
 	];
 
+	/*
+		  1
+		. － .
+	  8 |    | 2
+		. － .
+		   4
+	*/
+
     half_w = tile_width / 2;
     translate([half_w, half_w])
 	for(y = [0:rows - 1]) {