ImageGear .NET v24.12 - Updated
Edit PDF Content and Fonts
User Guide > How to Work with... > PDF > How to... > Manage PDF Content > Edit PDF Content and Fonts

The ImageGear API provides content editing functionality for creating, accessing, and editing PDF page content objects. With this API you can work with a page's content as a list of objects, such as images, text, forms. You can retain, modify, and save their data and properties.  

Document font support includes:

The code snippet below adds a text element to the content of a PDF. This example demonstrates creating a font, using the content in a PDF, and creating a text element.

To add Unicode text to a PDF, see the example at ImGearPDEText.Add.

C#
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        using System;
        using System.IO;
        using System.Windows.Forms;
 
        using ImageGear.Core;
        using ImageGear.Formats;
        using ImageGear.Formats.PDF;
 
        // This function will add a text element into the content of the PDF document.
        public void AddTextToPDFContent(ImGearPDFDocument pdfDocument)
        {
            // Select the first page of the current document.
            ImGearPDFPage page = (ImGearPDFPage)pdfDocument.Pages[0];
 
            // Get the content of the first page of the PDF document.
            using (ImGearPDEContent content = (page).GetContent())
            {
                // Get the count of the elements on the page.
                int elementCount = content.ElementCount;
 
                // Make a new text element to add to the page content.
                ImGearPDEText textElement = CreateTextElement();
 
                // Insert a Text Element into the content.
                content.AddElement((int)ImGearPDEInsertElement.AFTER_LAST, textElement);
                // Set the page's PDE content back into the page object.
                page.SetContent();
            }
        }
 
        // This function returns a new font to use for the text element.
        public ImGearPDEFont CreateFont()
        {
            // Create a ImGearPDEFontAttrs to get the attributes for ImGearPDEFont and ImGearPDFSysFont.
            ImGearPDEFontAttrs findAttrs = new ImGearPDEFontAttrs();
 
            // Set the font name.
            findAttrs.Name = new ImGearPDFAtom("Times-Roman");
            // Set the font type.
            findAttrs.Type = new ImGearPDFAtom("Type1");
 
            // Create the font.
            ImGearPDEFont font = new ImGearPDEFont(findAttrs, 0, 255, null, null, null, null, 0, 0, 0);
 
            return font;
        }
 
        // This function returns a new text element that will be added to the PDF content.
        public ImGearPDEText CreateTextElement()
        {
            ImGearPDEText textElement = null;
 
            // Set the color space to DeviceRGB.
            ImGearPDEColorSpace colorSpace = new ImGearPDEColorSpace(new ImGearPDFAtom("DeviceRGB"));
           
            // Set the attributes for the graphic state.
            ImGearPDEGraphicState gState = new ImGearPDEGraphicState();
 
            // Set the color values.
            // R.
            gState.FillColorSpec.Value.Color[0] = 0;
            // G.
            gState.FillColorSpec.Value.Color[1] = 128 * 255;
            // B.
            gState.FillColorSpec.Value.Color[2] = 255 * 255;
 
            gState.MiterLimit = (int)ImGearPDFFixedValues.TEN;
            gState.Flatness = (int)ImGearPDFFixedValues.ONE;
            gState.LineWidth = (int)ImGearPDFFixedValues.ONE;
 
            // Create a transformation matrix of fixed numbers.
            ImGearPDFFixedMatrix textMatrix = new ImGearPDFFixedMatrix();
            textMatrix.A = ImGearPDF.IntToFixed(20);
            textMatrix.D = ImGearPDF.IntToFixed(20);
            textMatrix.H = ImGearPDF.IntToFixed(100);
            textMatrix.V = ImGearPDF.IntToFixed(700);
 
            // Create a string of text.
            string textToAdd = "This is the string of text that will be added";
 
            // Create a font to use with the text element.
            ImGearPDEFont font = CreateFont();
 
            // Create a new text element.
            textElement = new ImGearPDEText();
            // Add the textToAdd into the element using the settings from above.
            textElement.Add(ImGearPDETextFlags.RUN, 0, textToAdd, font, gState, null, textMatrix, null);
 
            return textElement;
        }
VB.NET
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Imports System.IO
Imports System.Windows.Forms
 
Imports ImageGear.Core
Imports ImageGear.Formats
Imports ImageGear.Formats.PDF
 
 
' This function will add a text element into the content of the PDF document.
Public Sub AddTextToPDFContent(pdfDocument As ImGearPDFDocument)
 ' Select the first page of the current document.
 Dim page As ImGearPDFPage = DirectCast(pdfDocument.Pages(0), ImGearPDFPage)
 
 ' Get the content of the first page of the PDF document.
 Using content As ImGearPDEContent = (page).GetContent()
  ' Get the count of the elements on the page.
  Dim elementCount As Integer = content.ElementCount
 
  ' Make a new text element to add to the page content.
  Dim textElement As ImGearPDEText = CreateTextElement()
 
  ' Insert a Text Element into the content.
  content.AddElement(CInt(ImGearPDEInsertElement.AFTER_LAST), textElement)
  ' Set the page's PDE content back into the page object.
  page.SetContent()
 End Using
End Sub
 
 
' This function returns a new font to use for the text element.
Public Function CreateFont() As ImGearPDEFont
 ' Create a ImGearPDEFontAttrs to get the attributes for ImGearPDEFont and ImGearPDFSysFont.
 Dim findAttrs As New ImGearPDEFontAttrs()
 
 ' Set the font name.
 findAttrs.Name = New ImGearPDFAtom("Times-Roman")
 ' Set the font type.
 findAttrs.Type = New ImGearPDFAtom("Type1")
 
 ' Create the font.
 Dim font As New ImGearPDEFont(findAttrs, 0, 255, Nothing, Nothing, Nothing, _
  Nothing, 0, 0, 0)
 
 Return font
End Function
 
 
' This function returns a new text element that will be added to the PDF content.
Public Function CreateTextElement() As ImGearPDEText
 Dim textElement As ImGearPDEText = Nothing
 
 ' Set the color space to DeviceRGB.
 Dim colorSpace As New ImGearPDEColorSpace(New ImGearPDFAtom("DeviceRGB"))
 ' Set the attributes for the graphic state.
 Dim gState As New ImGearPDEGraphicState()
 
 ' Set the color values.
 ' R.
 gState.FillColorSpec.Value.Color(0) = 0
 ' G.
 gState.FillColorSpec.Value.Color(1) = 128 * 255
 ' B.
 gState.FillColorSpec.Value.Color(2) = 255 * 255
 
 gState.MiterLimit = CInt(ImGearPDFFixedValues.TEN)
 gState.Flatness = CInt(ImGearPDFFixedValues.ONE)
 gState.LineWidth = CInt(ImGearPDFFixedValues.ONE)
 
 ' Create a transformation matrix of fixed numbers.
 Dim textMatrix As New ImGearPDFFixedMatrix()
 textMatrix.A = ImGearPDF.IntToFixed(20)
 textMatrix.D = ImGearPDF.IntToFixed(20)
 textMatrix.H = ImGearPDF.IntToFixed(100)
 textMatrix.V = ImGearPDF.IntToFixed(700)
 
 ' Create a string of text.
 Dim textToAdd As String = "This is the string of text that will be added"
 
 ' Create a font to use with the text element.
 Dim font As ImGearPDEFont = CreateFont()
 
 ' Create a new text element.
 textElement = New ImGearPDEText()
 ' Add the textToAdd into the element using the settings from above.
 textElement.Add(ImGearPDETextFlags.RUN, 0, textToAdd, font, gState, Nothing, _
  textMatrix, Nothing)
 
 Return textElement
End Function

 

 

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