added method to reverse colors

lsongdev · Aug 20, 2019 · 5790d0c · 5790d0c
1 parent f5d296f
commit 5790d0c
Show file tree

Hide file tree

Showing 3 changed files with 14 additions and 2 deletions.
diff --git a/commands.js b/commands.js
@@ -282,7 +282,9 @@ _.BEEP = '\x1b\x42', // Printer Buzzer pre hex
  */
 _.COLOR = {
   0: '\x1b\x72\x00', // black
-  1: '\x1b\x72\x01' // red
+  1: '\x1b\x72\x01', // red
+  REVERSE: '\x1dB1', // Reverses the colors - white text on black background
+  UNREVERSE: '\x1dB0' // Default: undo the reverse - black text on white background
 };
 
 /**

diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "escpos",
-  "version": "2.5.1",
+  "version": "2.5.2",
   "description": "ESC/POS Printer driver for nodejs",
   "main": "index.js",
   "scripts": {

diff --git a/printer.js b/printer.js
@@ -756,6 +756,16 @@ Printer.prototype.color = function (color) {
   return this;
 };
 
+/**
+ * [reverse colors, if your printer supports it]
+ * @param {Boolean} bool - True for reverse, false otherwise
+ * @return {[Printer]} printer  [the escpos printer instance]
+ */
+Printer.prototype.setReverseColors = function (bool) {
+  this.buffer.write(bool ? _.COLOR.REVERSE : _.COLOR.UNREVERSE);
+  return this;
+};
+
 /**
  * [exports description]
  * @type {[type]}