Pdf creation library for dart / flutter

This library is divided in 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.

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

Example:

final pdf = Document();

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

To load an image it is possible to use the dart library image:

final img = decodeImage(File('test.webp').readAsBytesSync());
final image = PdfImage(
  pdf.document,
  image: img.data.buffer.asUint8List(),
  width: img.width,
  height: img.height,
);

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

To use a TrueType font:

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

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

To save the pdf file:

// 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());