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Add Image Watermark ​

To add an image watermark, follow these steps:

  1. Use CPDFReaderWidget to display the PDF document.
  2. Set the required properties for the image watermark using CPDFReaderWidgetController, including the page numbers, image file path, rotation angle, and scale.

Here’s an example of how to add an image watermark:

dart
late CPDFReaderWidgetController _controller;

@override
Widget build(BuildContext context) {
  return Scaffold(
    resizeToAvoidBottomInset: false,
    appBar: AppBar(),
    body: Column(children: [
      TextButton(onPressed: () async{
        // image file path
        // android platform support Uri format.
        // content://xxxx
        File imageFile = await extractAsset(context, 'images/logo.png');
        await controller.document.createWatermark(CPDFWatermark.image(
          imagePath: imageFile.path,
          opacity: 1,
          rotation: 45,
          pages: [0, 1, 2, 3],
          horizontalAlignment: CPDFWatermarkHorizontalAlignment.center,
          verticalAlignment: CPDFWatermarkVerticalAlignment.center,
        ));
      }, child: const Text('Add Image Watermark')),
      Expanded(child: CPDFReaderWidget(
        document: widget.documentPath,
        configuration: CPDFConfiguration(),
        onCreated: (controller) {
          setState(() {
            _controller = controller;
          });
        },
      ))
    ],));
}