# flutter_pdf

**Repository Path**: niusm/flutter_pdf

## Basic Information

- **Project Name**: flutter_pdf
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-06-01
- **Last Updated**: 2022-08-29

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# Pdf creation library for dart/flutter

This library is divided into two parts:

* a low-level Pdf creation library that takes care of the pdf bits generation.
* a Widgets system similar to Flutter's, for easy high-level Pdf creation.

It can create a full multi-pages document with graphics,
images, and text using TrueType fonts. With the ease of use you already know.

See an interactive demo here: <https://davbfr.github.io/dart_pdf/>.

<a href="https://davbfr.github.io/dart_pdf/">
<img alt="Example document" src="https://raw.githubusercontent.com/DavBfr/dart_pdf/master/pdf/example.jpg">
</a>

Use the `printing` package <https://pub.dev/packages/printing>
for full flutter print and share operation.

The coordinate system is using the internal Pdf unit:

* 1.0 is defined as 1 / 72.0 inch
* you can use the constants for centimeters, millimeters, and inch defined in PdfPageFormat

[![Buy Me A Coffee](https://bmc-cdn.nyc3.digitaloceanspaces.com/BMC-button-images/custom_images/orange_img.png "Buy Me A Coffee")](https://www.buymeacoffee.com/JORBmbw9h "Buy Me A Coffee")

## Installing

If you want to print the Pdf document on an actual printer with Flutter,
follow the instructions at <https://pub.dev/packages/printing>

1. Add this package to your package's `pubspec.yaml` file as described
   on the installation tab

2. Import the libraries

   ```dart
   import 'package:pdf/pdf.dart';
   import 'package:pdf/widgets.dart' as pw;
   ```

## Examples

```dart
final pdf = pw.Document();

pdf.addPage(pw.Page(
      pageFormat: PdfPageFormat.a4,
      build: (pw.Context context) {
        return pw.Center(
          child: pw.Text("Hello World"),
        ); // Center
      })); // Page
```

To load an image from a file:

```dart
final image = pw.MemoryImage(
  File('test.webp').readAsBytesSync(),
);

pdf.addPage(pw.Page(build: (pw.Context context) {
  return pw.Center(
    child: pw.Image.provider(image),
  ); // Center
})); // Page
```

To use a TrueType font:

```dart
final Uint8List fontData = File('open-sans.ttf').readAsBytesSync();
final ttf = pw.Font.ttf(fontData.buffer.asByteData());

pdf.addPage(pw.Page(
    pageFormat: PdfPageFormat.a4,
    build: (pw.Context context) {
      return pw.Center(
        child: pw.Text('Hello World', style: pw.TextStyle(font: ttf, fontSize: 40)),
      ); // Center
    })); // Page
```

To save the pdf file:

```dart
// On Flutter, use the [path_provider](https://pub.dev/packages/path_provider) library:
//   final output = await getTemporaryDirectory();
//   final file = File("${output.path}/example.pdf");
final file = File("example.pdf");
await file.writeAsBytes(pdf.save());
```

## Encryption and Digital Signature

Encryption using RC4-40, RC4-128, AES-128, and AES-256 is fully supported using a separate library.
This library also provides SHA1 or SHA-256 Digital Signature using your x509 certificate. The graphic signature is represented by a clickable widget that shows Digital Signature information.

Drop me an email for availability and more information.