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Spire.Doc, specially designed for developers/programmers to manipulate word proceeding tasks, from Word version 97-2003 to 2010 and 2013 in .NET, Silverlight and WPF Platform, always welcomes any kind of evaluation or test from either organizations or individuals with no charges.
This professional word component enables users to perform a large range of tasks on Word, as document operation (create, open, edit and save), mail merge, security, format (font, paragraph and page settings), objects (text, image, hyperlink, comment, table, bookmark, header/footer, footnote/endnote etc.). The conversion feature stands out of the peers, which enables developers to realize conversion between most popular formats with high fidelity, including Word to PDF, HTML, RTF, XML, Image formats, TEXT and RTF, XML and HTML files also can be converted to Word back. The following sections have been well-organized to show you how these functions work in detail.
Document Operation |
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Image and Shape |
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Bookmark |
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Header and Footer |
Footnote |
Adding a stamp to a PDF document can enhance its visual appeal and convey important information, such as approval, confidentiality, or urgency. This simple process allows users to mark documents with customized images or text, making it easier to communicate key messages. Whether for professional use or personal projects, stamping PDFs ensures clarity and adds a professional touch.
In this article, you will learn how to add a stamp to a PDF document using C# with Spire.PDF for .NET.
Install Spire.PDF for .NET
To begin with, you need to add the DLL files included in the Spire.PDF for .NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.
PM> Install-Package Spire.PDF
Prerequisite Knowledge
In a PDF, a stamp is an annotation or graphical element that adds supplementary information to a document. Spire.PDF for .NET includes the PdfRubberStampAnnotation class, which represents a rubber stamp. To create the appearance for the rubber stamp, you can use the PdfTemplate class, which serves as a canvas for drawing text, images, shapes, and date/time elements.
Add a Dynamic Stamp to PDF in C#
A dynamic stamp is a customizable annotation added to a PDF document to convey specific statuses, approvals, or other information. Unlike static stamps, dynamic stamps include variables or fields that can be updated in real time, such as the current date, time, username, or other custom data.
Here are the steps to add a dynamic stamp to a PDF using Spire.PDF for .NET:
- Create a PdfDocument object.
- Load a PDF file using PdfDocument.LoadFromFile() method.
- Create a PdfTemplate object with the desired size.
- Draw strings, including dynamic information like date and time, on the template using PdfTemplate.Graphics.DrawString().
- Create a PdfRubberStampAnnotation object and set the template as its appearance.
- Add the stamp to a specific PDF page using PdfPageBase.Annotations.Add() method.
- Save the document to a different PDF file.
- C#
using System.Drawing;
using Spire.Pdf;
using Spire.Pdf.Graphics;
using Spire.Pdf.Annotations;
using Spire.Pdf.Annotations.Appearance;
namespace AddDynamicStamp
{
class Program
{
static void Main(string[] args)
{
// Create a PdfDocument object
PdfDocument doc = new PdfDocument();
// Load a PDF document
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\input.pdf");
// Get a specific page
PdfPageBase page = doc.Pages[1];
// Create a PdfTemplate object
PdfTemplate template = new PdfTemplate(220, 50);
// Create two fonts
PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font("Elephant", 16f, FontStyle.Bold),true);
PdfTrueTypeFont font2 = new PdfTrueTypeFont(new Font("Times New Roman", 10f, FontStyle.Bold),true);
// Create a solid brush and a gradient brush
PdfSolidBrush solidBrush = new PdfSolidBrush(Color.Blue);
RectangleF rectangle1 = new RectangleF(new PointF(0, 0), template.Size);
PdfLinearGradientBrush linearGradientBrush = new PdfLinearGradientBrush(rectangle1, new PdfRGBColor(Color.White), new PdfRGBColor(Color.Blue), PdfLinearGradientMode.Horizontal);
// Create a pen
PdfPen pen = new PdfPen(solidBrush);
// Create a rounded rectangle path
int CornerRadius = 10;
PdfPath path = new PdfPath();
path.AddArc(template.GetBounds().X, template.GetBounds().Y, CornerRadius, CornerRadius, 180, 90);
path.AddArc(template.GetBounds().X + template.Width - CornerRadius, template.GetBounds().Y, CornerRadius, CornerRadius, 270, 90);
path.AddArc(template.GetBounds().X + template.Width - CornerRadius, template.GetBounds().Y + template.Height - CornerRadius, CornerRadius, CornerRadius, 0, 90);
path.AddArc(template.GetBounds().X, template.GetBounds().Y + template.Height - CornerRadius, CornerRadius, CornerRadius, 90, 90);
path.AddLine(template.GetBounds().X, template.GetBounds().Y + template.Height - CornerRadius, template.GetBounds().X, template.GetBounds().Y + CornerRadius / 2);
// Draw path on the template
template.Graphics.DrawPath(pen, path);
template.Graphics.DrawPath(linearGradientBrush, path);
// Draw text on the template
String string1 = "APPROVED\n";
String string2 = "By Marketing Manager at " + DateTime.Now.ToString("HH:mm, MMM dd, yyyy");
template.Graphics.DrawString(string1, font1, solidBrush, new PointF(5, 5));
template.Graphics.DrawString(string2, font2, solidBrush, new PointF(2, 28));
// Create a rubber stamp, specifying its size and location
RectangleF rectangle2 = new RectangleF(55, page.ActualSize.Height - 55 - 70, 240, 55);
PdfRubberStampAnnotation stamp = new PdfRubberStampAnnotation(rectangle2);
// Create a PdfAppearance object and apply the template as its normal state
PdfAppearance apprearance = new PdfAppearance(stamp);
apprearance.Normal = template;
// Apply the appearance to stamp
stamp.Appearance = apprearance;
// Add the stamp annotation to annotation collection
page.Annotations.Add(stamp);
// Save the file
doc.SaveToFile("DynamicStamp.pdf", FileFormat.PDF);
// Dispose resources
doc.Dispose();
}
}
}
Add an Image Stamp to PDF in C#
An image stamp in a PDF is a graphical element that is added to a document as an annotation or overlay. This stamp typically consists of an image that can be positioned at a specific location on a PDF page.
Here are the steps to add an image stamp to a PDF using Spire.PDF for .NET:
- Create a PdfDocument object.
- Load a PDF file using PdfDocument.LoadFromFile() method.
- Create a PdfTemplate object with the desired size.
- Draw strings, including dynamic information like date and time, on the template using PdfTemplate.Graphics.DrawString().
- Create a PdfRubberStampAnnotation object and set the template as its appearance.
- Add the stamp to a specific PDF page using PdfPageBase.Annotations.Add() method.
- Save the document to a different PDF file.
- C#
using Spire.Pdf;
using Spire.Pdf.Annotations;
using Spire.Pdf.Annotations.Appearance;
using Spire.Pdf.Graphics;
using System.Drawing;
namespace AddImageStamp
{
class Program
{
static void Main(string[] args)
{
// Create a PdfDocument object
PdfDocument doc = new PdfDocument();
// Load a PDF document
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\input.pdf");
// Get a specific page
PdfPageBase page = doc.Pages[1];
// Load an image file
PdfImage image = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\confidential.png");
// Get the width and height of the image
int width = image.Width;
int height = image.Height;
// Create a PdfTemplate object based on the size of the image
PdfTemplate template = new PdfTemplate(width, height, true);
// Draw image on the template
template.Graphics.DrawImage(image, 0, 0, width, height);
// Create a rubber stamp annotation, specifying its location and position
RectangleF rect = new RectangleF(page.ActualSize.Width - width - 50, page.ActualSize.Height - height - 50, width, height);
PdfRubberStampAnnotation stamp = new PdfRubberStampAnnotation(rect);
// Create a PdfAppearance object
PdfAppearance pdfAppearance = new PdfAppearance(stamp);
// Set the template as the normal state of the appearance
pdfAppearance.Normal = template;
// Apply the appearance to the stamp
stamp.Appearance = pdfAppearance;
// Add the stamp annotation to PDF
page.Annotations.Add(stamp);
// Save the file
doc.SaveToFile("ImageStamp.pdf");
// Dispose resources
doc.Dispose();
}
}
}
Apply for a Temporary License
If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.
When we work with Excel pie chart, we may need to separate each part of pie chart to make them stand out. Spire.XLS offers a property of Series.DataFormat.Percent to enable developers to pull the whole pie apart. It also offers a property of Series.DataPoints.DataFormat.Percent to pull apart a single slice from the whole pie chart.
This article is going to introduce the method of how to set the separation width between slices in pie chart in C# by using Spire.XLS.
On MS Excel, We can adjust the percentage of "Pie Explosion" on the Series Options at the "format data series" area to control the width between each section in the chart.
Code Snippet of how to set the separation width between slices in pie chart.
using Spire.Xls;
namespace ExplodePieChart
{
class Program
{
static void Main(string[] args)
{
Workbook workbook = new Workbook();
workbook.LoadFromFile("Sample.xlsx");
Worksheet ws = workbook.Worksheets[0];
Chart chart = ws.Charts[0];
// Set the separation width between slices in pie chart.
for (int i = 0; i < chart.Series.Count; i++)
{
chart.Series[i].DataFormat.Percent = 20;
}
workbook.SaveToFile("result.xlsx", ExcelVersion.Version2010);
}
}
}
Effective screenshot after pull the whole pie apart.
Code Snippet of how to split a single slice from the whole pie chart.
using Spire.Xls;
namespace ExplodePieChart
{
class Program
{
static void Main(string[] args)
{
{
Workbook workbook = new Workbook();
workbook.LoadFromFile("Sample.xlsx");
Worksheet ws = workbook.Worksheets[0];
Chart chart = ws.Charts[0];
chart.Series[0].DataPoints[0].DataFormat.Percent = 20;
workbook.SaveToFile("ExplodePieChart.xlsx", ExcelVersion.Version2013);
}
}
}
}
Effective screenshot after pull a single part from the pie chart apart.
