first commit

lib/thermal priting invoices/label_print_test.dart

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+import 'dart:typed_data';
+
+import 'package:bluetooth_print_plus/bluetooth_print_plus.dart';
+
+Future<void> printLabelTest({
+  required String productName,
+  required String price,
+  required String date,
+  required String barcodeData,
+  required Uint8List pngBytes,
+  required bool isTwoInch,
+}) async {
+  TscCommand tscCommand = TscCommand();
+  await tscCommand.cleanCommand();
+  await tscCommand.size(width: isTwoInch ? 45 : 38, height: 25); // mm
+  await tscCommand.gap(2);
+  await tscCommand.cls();
+  await tscCommand.image(image: pngBytes, x: 0, y: 0);
+  await tscCommand.print(1);
+  final cmd = await tscCommand.getCommand();
+  BluetoothPrintPlus.write(cmd);
+}
+
+String centerText(String text, {int lineWidth = 24}) {
+  if (text.length >= lineWidth) return text;
+  int totalPadding = lineWidth - text.length;
+  int leftPadding = totalPadding ~/ 2; // only add left padding
+  return ' ' * leftPadding + text;
+}