1. GroupDocs Documentation
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    3. GroupDocs.Watermark Product Family
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    5. GroupDocs.Watermark for .NET
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    7. Developer guide
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    9. Advanced usage
    10. /
    11. Adding watermarks
    12. /
    13. To diagrams

    Add watermarks to diagram documents

    Adding watermark to all pages of a particular type

    Using GroupDocs.Watermark, you can add watermark to all pages of a particular type in a document. It consists of following steps.

    1. Load the document
    2. Create and initialize watermark object
    3. Set watermark properties
    4. Add watermark by specifying page type using PlacementType of DiagramShapeWatermarkOptions
    5. Save the document

    Following code shows how to add watermark to a particular type of the pages.

    AdvancedUsage.AddingWatermarks.AdWatermarksToDiagrams.DiagramAddWatermarkToAllPagesOfParticularType

    DiagramLoadOptions loadOptions = new DiagramLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\diagram.vsdx"
using (Watermarker watermarker = new Watermarker("diagram.vsdx", loadOptions))
{
    // Initialize text watermark
    TextWatermark textWatermark = new TextWatermark("Test watermark 1", new Font("Calibri", 19));
    DiagramShapeWatermarkOptions textWatermarkOptions = new DiagramShapeWatermarkOptions();
    textWatermarkOptions.PlacementType = DiagramWatermarkPlacementType.BackgroundPages;

    // Add text watermark to all background pages
    watermarker.Add(textWatermark, textWatermarkOptions);

    // Initialize image watermark
    using (ImageWatermark imageWatermark = new ImageWatermark("logo.jpg"))
    {
        DiagramShapeWatermarkOptions imageWatermarkOptions = new DiagramShapeWatermarkOptions();
        imageWatermarkOptions.PlacementType = DiagramWatermarkPlacementType.ForegroundPages;

        // Add image watermark to all foreground pages
        watermarker.Add(imageWatermark, imageWatermarkOptions);
    }

    watermarker.Save("diagram.vsdx");
}

    Adding watermark on separate background page

    In some cases, you may want to place the watermark on separate newly created background pages. In this case, use below code.

    AdvancedUsage.AddingWatermarks.AddWatermarksToDiagrams.DiagramAddWatermarkToSeparateBackgroundPage

    DiagramLoadOptions loadOptions = new DiagramLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\diagram.vsdx"
using (Watermarker watermarker = new Watermarker("diagram.vsdx", loadOptions))
{
    // Initialize watermark of any supported type
    TextWatermark textWatermark = new TextWatermark("Test watermark 1", new Font("Calibri", 19));

    DiagramShapeWatermarkOptions options = new DiagramShapeWatermarkOptions();
    options.PlacementType = DiagramWatermarkPlacementType.SeparateBackgrounds;

    // Create separate background for each page where it is not set. Add watermark to it.
    watermarker.Add(textWatermark, options);
    watermarker.Save("diagram.vsdx");
}

    Add watermark to a particular page

    GroupDocs.Watermark allows you to add watermark to a particular page of the document using PageIndex of DiagramPageWatermarkOptions as shown in below example.

    AdvancedUsage.AddingWatermarks.AddWatermarksToDiagrams.DiagramAddWatermarkToParticularPage

    DiagramLoadOptions loadOptions = new DiagramLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\diagram.vsdx"
using (Watermarker watermarker = new Watermarker("diagram.vsdx", loadOptions))
{
    TextWatermark textWatermark = new TextWatermark("Test watermark", new Font("Calibri", 19));
    DiagramPageWatermarkOptions textWatermarkOptions = new DiagramPageWatermarkOptions();
    textWatermarkOptions.PageIndex = 0;

    // Add text watermark to the first page
    watermarker.Add(textWatermark, textWatermarkOptions);
    using (ImageWatermark imageWatermark = new ImageWatermark("logo.jpg"))
    {
        DiagramPageWatermarkOptions imageWatermarkOptions = new DiagramPageWatermarkOptions();
        imageWatermarkOptions.PageIndex = 1;
        // Add image watermark to the second page
        watermarker.Add(imageWatermark, imageWatermarkOptions);
    }

    watermarker.Save("diagram.vsdx");
}

    Lock watermark

    When you’re calling Add method of Watermaker object created for the Diagram document, simple shape is added to the document. There is no difference between added watermark and Visio shapes that are used to create diagrams.

    GroupDocs.Watermark allows you to protect watermark from editing in MS Visio by setting IsLocked property of DiagramShapeWatermarkOptions (as shown in the following example).

    AdvancedUsage.AddingWatermarks.AddWatermarksToDiagrams.DiagramLockWatermarkShape

    DiagramLoadOptions loadOptions = new DiagramLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\diagram.vsdx"
using (Watermarker watermarker = new Watermarker("diagram.vsdx", loadOptions))
{
    TextWatermark watermark = new TextWatermark("Test watermark", new Font("Arial", 19));

    DiagramShapeWatermarkOptions options = new DiagramShapeWatermarkOptions();
    options.IsLocked = true;

    // Editing of the shape in Visio is forbidden
    watermarker.Add(watermark, options);

    watermarker.Save("diagram.vsdx");
}

    Advanced use cases

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