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GroupDocs.Signature provides with SignOptions property Extensions that expects list of different extensions classes. At this moment here are few of them
- SpreadsheetPosition that allows to specify for Spreadsheet documents signature position as Row and Column numbers
- TextShadow alternative extension for Text signature property
Here are the steps to add extensions to signature into document with GroupDocs.Signature:
- Create new instance of Signature class and pass source document path as a constructor parameter.
- Instantiate the SignOptions object with all required additional options.
- Create instance of required Extension and call SignOptions.Extensions.Add method with passed object
- Call Sign method of Signature class instance and pass SignOptions to it.
This example shows how to add Text signature to document.
using (Signature signature = new Signature("sample.pdf"))
{
TextSignOptions options = new TextSignOptions("John Smith")
{
// set signature position
Left = 100,
Top = 100,
// set signature rectangle
Width = 100,
Height = 30,
// set signature alignment
// when VerticalAlignment is set the Top coordinate will be ignored.
// Use Margin properties Top, Bottom to provide vertical offset
VerticalAlignment = Domain.VerticalAlignment.Top,
// when HorizontalAlignment is set the Left coordinate will be ignored.
// Use Margin properties Left, Right to provide horizontal offset
HorizontalAlignment = Domain.HorizontalAlignment.Right,
Margin = new Padding() { Top = 20, Right = 20 },
// adjust signature appearance
// setup signature border
Border = new Border()
{
Color = Color.DarkGreen,
DashStyle = DashStyle.DashLongDashDot,
Transparency = 0.5,
Visible = true,
Weight = 2
},
// set text color and Font
ForeColor = Color.Red,
Font = new SignatureFont { Size = 12, FamilyName = "Comic Sans MS" },
// setup background
Background = new Background()
{
Color = Color.LimeGreen,
Transparency = 0.5,
Brush = new LinearGradientBrush(Color.LimeGreen, Color.DarkGreen)
},
// set rotation
RotationAngle = 45,
// set alternative signature implementation on document page
SignatureImplementation = TextSignatureImplementation.Image
};
// set up shadow options for text
TextShadow shadow = new TextShadow();
shadow.Color = Color.OrangeRed;
shadow.Angle = 135;
shadow.Blur = 5;
shadow.Distance = 4;
shadow.Transparency = 0.2;
//add text shadow to signature extensions
options.Extensions.Add(shadow);
// specify Spreadsheet position over extension
options.Extensions.Add(new SpreadsheetPosition(10, 10));
// sign document to file
signature.Sign("signed.pdf", options);
}
You may easily run the code above and see the feature in action in our GitHub examples:
- GroupDocs.Signature for .NET examples, plugins, and showcase
- GroupDocs.Signature for Java examples, plugins, and showcase
- Document Signature for .NET MVC UI Example
- Document Signature for .NET App WebForms UI Example
- Document Signature for Java App Dropwizard UI Example
- Document Signature for Java Spring UI Example
Along with the full-featured .NET library, we provide simple but powerful free online apps.
To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.
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