Add optional parameters to the qrcode() function

README.md

@@ -197,12 +197,24 @@ The following symbologies can be used: 'upca', 'ean13', 'ean8', 'code39', 'itf',
 
 ### Qrcode
 
-Print a QR code. The first parameter is the value of the QR code.
+Print a QR code. The first parameter is the data of the QR code.
 
     let result = encoder
         .qrcode('https://nielsleenheer.com')
         .encode()
 
+The qrcode function accepts the following additional parameters:
+
+- *model* - a number that can be 1 for Model 1 and 2 for Model 2
+- *size* - a number that can be between 1 and 8 for determining the size of the QR code
+- *errorlevel* - a string that can be either 'l', 'm', 'q' or 'h'.
+
+For example:
+
+    let result = encoder
+        .qrcode('https://nielsleenheer.com', 1, 8, 'h')
+        .encode()
+
 
 ### Image
 

src/esc-pos-encoder.js

@@ -348,26 +348,89 @@ class EscPosEncoder {
      * QR code
      *
      * @param  {string}           value  the value of the qr code
+     * @param  {number}           model  model of the qrcode, either 1 or 2
+     * @param  {number}           size   size of the qrcode, a value between 1 and 8
+     * @param  {string}           errorlevel  the amount of error correction used, either 'l', 'm', 'q', 'h'
      * @return {object}                  Return the object, for easy chaining commands
      *
      */
-    qrcode(value) {
-        let bytes = iconv.encode(value, 'iso88591');
+    qrcode(value, model, size, errorlevel) {
+        /* Force printing the print buffer and moving to a new line */
+
+        this._queue([
+            0x0a,
+        ]);
+
+        /* Model */
+
+        const models = {
+            1: 0x31,
+            2: 0x32,
+        };
+
+        if (typeof model === 'undefined') {
+            model = 2;
+        }
+
+        if (model in models) {
+            this._queue([
+                0x1d, 0x28, 0x6b, 0x04, 0x00, 0x31, 0x41, models[model], 0x00,
+            ]);
+        } else {
+            throw new Error('Model must be 1 or 2');
+        }
+
+        /* Size */
 
-        // 0x1d, 0x21, [ 0x00, 0x11, 0x22, 0x33 ]
+        if (typeof size === 'undefined') {
+            size = 6;
+        }
 
-        // 0x1b, 0x4a, 0x28
+        if (typeof size !== 'number') {
+            throw new Error('Size must be a number');
+        }
 
+        if (size < 1 || size > 8) {
+            throw new Error('Size must be between 1 and 8');
+        }
+
+        this._queue([
+            0x1d, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x43, size,
+        ]);
+
+        /* Error level */
+
+        const errorlevels = {
+            'l': 0x30,
+            'm': 0x31,
+            'q': 0x32,
+            'h': 0x33,
+        };
+
+        if (typeof errorlevel === 'undefined') {
+            errorlevel = 'm';
+        }
+
+        if (errorlevel in errorlevels) {
+            this._queue([
+                0x1d, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x45, errorlevels[errorlevel],
+            ]);
+        } else {
+            throw new Error('Error level must be l, m, q or h');
+        }
+
+        /* Data */
+
+        let bytes = iconv.encode(value, 'iso88591');
         let length = bytes.length + 3;
 
         this._queue([
-            0x1d, 0x28, 0x6b, 0x04, 0x00, 0x31, 0x41, 0x32, 0x00,
-            0x1d, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x43, 0x06,
-            0x1d, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x45, 0x31,
-            0x1d, 0x28, 0x6b,
-                length % 0xff, length / 0xff,
-                0x31, 0x50, 0x30,
-                bytes,
+            0x1d, 0x28, 0x6b, length % 0xff, length / 0xff, 0x31, 0x50, 0x30, bytes,
+        ]);
+
+        /* Print QR code */
+
+        this._queue([
             0x1d, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x51, 0x30,
         ]);
 

test/esc-pos-encoder.js

@@ -149,8 +149,16 @@ describe('EscPosEncoder', function() {
     describe('qrcode(https://nielsleenheer.com)', function () {
         let result = encoder.qrcode('https://nielsleenheer.com').encode();
 
-        it('should be [ 29, 40, 107, 4, 0, 49, 65, 50, 0, 29, 40, 107, 3, 0, ... ]', function () {
-            assert.deepEqual(new Uint8Array([ 29, 40, 107, 4, 0, 49, 65, 50, 0, 29, 40, 107, 3, 0, 49, 67, 6, 29, 40, 107, 3, 0, 49, 69, 49, 29, 40, 107, 28, 0, 49, 80, 48, 104, 116, 116, 112, 115, 58, 47, 47, 110, 105, 101, 108, 115, 108, 101, 101, 110, 104, 101, 101, 114, 46, 99, 111, 109, 29, 40, 107, 3, 0, 49, 81, 48 ]), result);
+        it('should be [ 10, 29, 40, 107, 4, 0, 49, 65, 50, 0, 29, 40, 107, 3, 0, ... ]', function () {
+            assert.deepEqual(new Uint8Array([ 10, 29, 40, 107, 4, 0, 49, 65, 50, 0, 29, 40, 107, 3, 0, 49, 67, 6, 29, 40, 107, 3, 0, 49, 69, 49, 29, 40, 107, 28, 0, 49, 80, 48, 104, 116, 116, 112, 115, 58, 47, 47, 110, 105, 101, 108, 115, 108, 101, 101, 110, 104, 101, 101, 114, 46, 99, 111, 109, 29, 40, 107, 3, 0, 49, 81, 48 ]), result);
+        });
+    });
+
+    describe('qrcode(https://nielsleenheer.com, 1, 8, h)', function () {
+        let result = encoder.qrcode('https://nielsleenheer.com', 1, 8, 'h').encode();
+
+        it('should be [ 10, 29, 40, 107, 4, 0, 49, 65, 49, 0, 29, 40, 107, 3, 0, ... ]', function () {
+            assert.deepEqual(new Uint8Array([ 10, 29, 40, 107, 4, 0, 49, 65, 49, 0, 29, 40, 107, 3, 0, 49, 67, 8, 29, 40, 107, 3, 0, 49, 69, 51, 29, 40, 107, 28, 0, 49, 80, 48, 104, 116, 116, 112, 115, 58, 47, 47, 110, 105, 101, 108, 115, 108, 101, 101, 110, 104, 101, 101, 114, 46, 99, 111, 109, 29, 40, 107, 3, 0, 49, 81, 48 ]), result);
         });
     });