From 8922bed52492ef6f1251d8fc38e694e5ef35334a Mon Sep 17 00:00:00 2001
From: Michael Billington <michael.billington@gmail.com>
Date: Thu, 25 Oct 2018 21:04:43 +1100
Subject: [PATCH] implement upside-down print command, closes #615

---
 src/Mike42/Escpos/Printer.php | 13 ++++++++++++-
 test/unit/EscposTest.php      |  7 +++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/Mike42/Escpos/Printer.php b/src/Mike42/Escpos/Printer.php
index 5e732b1a..c1441a91 100644
--- a/src/Mike42/Escpos/Printer.php
+++ b/src/Mike42/Escpos/Printer.php
@@ -972,7 +972,18 @@ public function setUnderline($underline = Printer::UNDERLINE_SINGLE)
         self::validateInteger($underline, 0, 2, __FUNCTION__);
         $this -> connector -> write(self::ESC . "-" . chr($underline));
     }
-    
+
+    /**
+     * Print each line upside-down (180 degrees rotated).
+     *
+     * @param boolean $on True to enable, false to disable.
+     */
+    public function setUpsideDown($on = true)
+    {
+        self::validateBoolean($on, __FUNCTION__);
+        $this -> connector -> write(self::ESC . "{" . ($on ? chr(1) : chr(0)));
+    }
+
     /**
      * Add text to the buffer.
      *
diff --git a/test/unit/EscposTest.php b/test/unit/EscposTest.php
index 5ac5f263..0b70e96b 100644
--- a/test/unit/EscposTest.php
+++ b/test/unit/EscposTest.php
@@ -1100,6 +1100,13 @@ public function testPrintLeftMarginInvalid()
         $this -> printer -> setPrintLeftMargin(70000);
         $this -> checkOutput();
     }
+
+    /* Upside-down print */
+    public function testSetUpsideDown()
+    {
+        $this -> printer -> setUpsideDown(true);
+        $this -> checkOutput("\x1b@\x1b{\x01");
+    }
 }
 
 /*