public MainWindow()
{
this.InitializeComponent();
this.document = new DocumentViewModel();
this.DataContext = this.document;
this.document.PropertyChanged += this.DocumentOnPropertyChanged;
Apitron.PDF.Kit.FixedLayout.Resources.XObjects.Image star =
new Apitron.PDF.Kit.FixedLayout.Resources.XObjects.Image("star", "Resources//star.png", true);
Apitron.PDF.Kit.FixedLayout.Resources.XObjects.Image smile =
new Apitron.PDF.Kit.FixedLayout.Resources.XObjects.Image("smile", "Resources//smile.png", true);
this.resourceManager = new ResourceManager();
resourceManager.RegisterResource(star);
resourceManager.RegisterResource(smile);
}
/// <summary>
/// Adds a watermark on all pages of the specified document.
/// </summary>
/// <param name="doc">Document to process.</param>
/// <param name="imageDataStream">Stream containing image data to be used as watermark. Caller is reposible for closing it.</param>
/// <param name="outputStream">Output stream, optional. If not set, incremental save will be performed. Caller is responsible for closing it.</param>
public static void Watermark(this FixedDocument doc, Stream imageDataStream, Stream outputStream = null)
{
if (doc == null)
{
throw new ArgumentNullException(nameof(doc));
}
if (imageDataStream == null)
{
throw new ArgumentNullException(nameof(imageDataStream));
}
// create and register image resource
string imageResourceId = Guid.NewGuid().ToString("N");
Image imageResource = new Image(imageResourceId, imageDataStream);
doc.ResourceManager.RegisterResource(imageResource);
// register watermark XObject it will be referenced in all watermark annotations
FixedContent watermarkContent = new FixedContent(Guid.NewGuid().ToString("N"),
new Boundary(imageResource.Width, imageResource.Height));
watermarkContent.Content.AppendImage(imageResourceId, 0, 0, imageResource.Width, imageResource.Height);
doc.ResourceManager.RegisterResource(watermarkContent);
// add annotations to every page
foreach (Page page in doc.Pages)
{
WatermarkAnnotation watermarkAnnotation = CreateWatermarkAnnotation(page.Boundary.MediaBox, watermarkContent);
doc.ResourceManager.RegisterResource(watermarkAnnotation.Watermark);
page.Annotations.Add(watermarkAnnotation);
}
// save to specified file or do an incremental update
if (outputStream != null)
{
doc.Save(outputStream);
}
else
{
doc.Save();
}
}
