ImageGear .NET v25.2 - Updated
Developer Guide / How to Work with... / PDF / How to... / Manage PDF Content / Edit PDF Content and Fonts
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    Edit PDF Content and Fonts
    In This Topic

    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.

    PDF support needs to be initialized first for this snippet to work. To get familiar with initializing IGNET, initializing PDF support, loading a PDF, saving a PDF, and terminating PDF support, try any one of the tutorials.
    C#
    Copy Code 
            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
    Copy Code 
    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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