From f8857384fdad82b0eb9093ae9048784f150e7f1c Mon Sep 17 00:00:00 2001
From: Roman Priesol <roman@priesol.net>
Date: Sun, 13 Sep 2026 12:12:28 +0200
Subject: [PATCH] Shorten default barcode height -- printer default (~162 dots)
 prints noticeably tall

---
 lib/receipt_builder.rb | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/receipt_builder.rb b/lib/receipt_builder.rb
index c5ac887..9e14db8 100644
--- a/lib/receipt_builder.rb
+++ b/lib/receipt_builder.rb
@@ -87,8 +87,10 @@ class ReceiptBuilder
     self
   end
 
-  # Native ESC/POS EAN-13
-  def ean13(code)
+  # Native ESC/POS EAN-13. height is in dots (GS h) -- the printer's default
+  # (~162 dots) prints noticeably tall; 50 is a shorter, still-scannable size.
+  def ean13(code, height: 50)
+    @buffer << "\x1D\x68" << height.chr # GS h n -- set barcode height
     @buffer << "\x1D\x6B\x02" << code.b << "\x00"
     self
   end