Readme: Added Print image examples. Updated `esc_pos_utils` package version to `0.3.2`.

CHANGELOG.md

+## [3.1.2]
+* Updated `esc_pos_utils` package version to `0.3.2`.
+
+
 ## [3.1.1]
 * Updated `esc_pos_utils` package version to `0.3.1` (Open Cash Drawer). 
 

README.md

@@ -88,16 +88,26 @@ ticket.row([
 
 ### Print an image:
 
+This package implements 3 ESC/POS functions:
+* `ESC *` - print in column format
+* `GS v 0` - print in bit raster format (obsolete)
+* `GS ( L` - print in bit raster format
+
+Note that your printer may support only some of the above functions.
+
 ```dart
 import 'dart:io';
 import 'package:image/image.dart';
 
-const String filename = './logo.png';
-final Image image = decodeImage(File(filename).readAsBytesSync());
-// Using (ESC *) command
+final ByteData data = await rootBundle.load('assets/logo.png');
+final Uint8List bytes = data.buffer.asUint8List();
+final Image image = decodeImage(bytes);
+// Using `ESC *`
 ticket.image(image);
-// Using an alternative obsolette (GS v 0) command
+// Using `GS v 0` (obsolete)
 ticket.imageRaster(image);
+// Using `GS ( L`
+ticket.imageRaster(image, imageFn: PosImageFn.graphics);
 ```
 
 ### Print a barcode:

example/discover_printers/lib/main.dart

@@ -136,8 +136,9 @@ class _MyHomePageState extends State<MyHomePage> {
     final Uint8List bytes = data.buffer.asUint8List();
     final Image image = decodeImage(bytes);
     ticket.image(image);
-    // Print image using an alternative (obsolette) command
+    // Print image using alternative commands
     // ticket.imageRaster(image);
+    // ticket.imageRaster(image, imageFn: PosImageFn.graphics);
 
     // Print barcode
     final List<int> barData = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 4];

example/discover_printers/pubspec.yaml

@@ -15,7 +15,9 @@ dependencies:
   image: ^2.1.4
   esc_pos_printer:
     path: ../../
-  esc_pos_utils: ^0.3.1
+  esc_pos_utils: ^0.3.2
+  # esc_pos_utils:
+    # path: ../../../esc_pos_utils
 
 dev_dependencies:
   flutter_test:

example/example.dart

@@ -65,8 +65,9 @@ Future<Ticket> testTicket() async {
   // final Uint8List bytes = data.buffer.asUint8List();
   // final Image image = decodeImage(bytes);
   // ticket.image(image);
-  // Print image using an alternative (obsolette) command
+  // Print image using alternative commands
   // ticket.imageRaster(image);
+  // ticket.imageRaster(image, imageFn: PosImageFn.graphics);
 
   // Print barcode
   final List<int> barData = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 4];

pubspec.yaml

 name: esc_pos_printer
 description: The library allows to print receipts using an ESC/POS thermal WiFi printer.
-version: 3.1.1
+version: 3.1.2
 homepage: https://github.com/andrey-ushakov/esc_pos_printer
 
 environment:
@@ -9,7 +9,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  esc_pos_utils: ^0.3.1
+  esc_pos_utils: ^0.3.2
   # esc_pos_utils:
   #   path: ../esc_pos_utils