VintaSoft Imaging .NET SDK 12.4: Documentation for .NET developer
In This Topic
    PDF: Add a check box field to the PDF interactive form
    In This Topic
    Here is C#/VB.NET code that demonstrates how to create a check box field and add it to an interactive form of PDF document:

    class PdfInteractiveFormCheckBoxFieldExample
    {
        /// <summary>
        /// Creates a PDF document with the check box fields.
        /// </summary>
        /// <param name="filename">The filename.</param>
        public static void CreateDocumentWithCheckBoxField(string filename)
        {
            // create PDF document
            using (Vintasoft.Imaging.Pdf.PdfDocument document = new Vintasoft.Imaging.Pdf.PdfDocument())
            {
                // create interactive form in PDF document
                document.InteractiveForm = 
                    new Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfDocumentInteractiveForm(document);
    
                // specify that the viewer application must construct appearance streams and
                // appearance properties for all widget annotations
                document.InteractiveForm.NeedAppearances = true;
    
                // create an empty page
                Vintasoft.Imaging.Pdf.Tree.PdfPage page = new Vintasoft.Imaging.Pdf.Tree.PdfPage(
                    document, Vintasoft.Imaging.PaperSizeKind.A4);
                // add page to the document
                document.Pages.Add(page);
    
                float fontSize = 20;
                float width = fontSize * 3f / 2f;
                float height = width;
                // create a rectangle that defines check box position on PDF page
                System.Drawing.RectangleF rect = new System.Drawing.RectangleF(
                    (page.Size.Width - width) / 2,
                    ((page.Size.Height - height) / 3) * 2,
                    width, height);
    
                // create the first check box
                Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormCheckBoxField checkBox1 = 
                    new Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormCheckBoxField(document, "CheckBox1", rect);
                // create a rectangle that defines size of the check box content
                System.Drawing.RectangleF contentRect = new System.Drawing.RectangleF(0, 0, rect.Width, rect.Height);
                // get a reference to "ZapfDingbats" font
                Vintasoft.Imaging.Pdf.Tree.Fonts.PdfFont font = document.FontManager.GetStandardFont(
                    Vintasoft.Imaging.Pdf.Tree.Fonts.PdfStandardFontType.ZapfDingbats);
                // create "Yes" appearance of checkbox1
                using (Vintasoft.Imaging.Pdf.Drawing.PdfGraphics g = checkBox1.CreateYesAppearanceGraphics())
                {
                    g.DrawString("o", font, fontSize, new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Black), 
                        contentRect, Vintasoft.Imaging.Pdf.Drawing.PdfContentAlignment.Center, false);
                    g.DrawString("4", font, fontSize, new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Green), 
                        contentRect, Vintasoft.Imaging.Pdf.Drawing.PdfContentAlignment.Center, false);
                }
                // create "Off" appearance of checkbox1
                using (Vintasoft.Imaging.Pdf.Drawing.PdfGraphics g = checkBox1.CreateOffAppearanceGraphics())
                {
                    g.DrawString("o", font, fontSize, new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Black), 
                        contentRect, Vintasoft.Imaging.Pdf.Drawing.PdfContentAlignment.Center, false);
                }
                // set value of checkbox1
                checkBox1.Value = "Off";
    
                // change the vertical position of rectangle that defines check box position on PDF page
                rect.Y -= rect.Height;
    
                // create the second check box
                Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormCheckBoxField checkBox2 =
                    new Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormCheckBoxField(document, "CheckBox2", rect);
                // use checkbox1 appearance as checkbox2 appearance
                checkBox2.Annotation.Appearances = checkBox1.Annotation.Appearances;
                // set value of checkBox2
                checkBox2.Value = "Yes";
    
                // add the check box fields to the interactive form of document
                document.InteractiveForm.Fields.Add(checkBox1);
                document.InteractiveForm.Fields.Add(checkBox2);
    
                // add annotations, associated with check box fields, to the page
                page.Annotations = new Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotationList(document);
                page.Annotations.Add(checkBox1.Annotation);
                page.Annotations.Add(checkBox2.Annotation);
    
                // save the document
                document.Save(filename);
            }
        }
    }
    
    Class PdfInteractiveFormCheckBoxFieldExample
        ''' <summary>
        ''' Creates a PDF document with the check box fields.
        ''' </summary>
        ''' <param name="filename">The filename.</param>
        Public Shared Sub CreateDocumentWithCheckBoxField(filename As String)
            ' create PDF document
            Using document As New Vintasoft.Imaging.Pdf.PdfDocument()
                ' create interactive form in PDF document
                document.InteractiveForm = New Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfDocumentInteractiveForm(document)
    
                ' specify that the viewer application must construct appearance streams and
                ' appearance properties for all widget annotations
                document.InteractiveForm.NeedAppearances = True
    
                ' create an empty page
                Dim page As New Vintasoft.Imaging.Pdf.Tree.PdfPage(document, Vintasoft.Imaging.PaperSizeKind.A4)
                ' add page to the document
                document.Pages.Add(page)
    
                Dim fontSize As Single = 20
                Dim width As Single = fontSize * 3F / 2F
                Dim height As Single = width
                ' create a rectangle that defines check box position on PDF page
                Dim rect As New System.Drawing.RectangleF((page.Size.Width - width) / 2, ((page.Size.Height - height) / 3) * 2, width, height)
    
                ' create the first check box
                Dim checkBox1 As New Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormCheckBoxField(document, "CheckBox1", rect)
                ' create a rectangle that defines size of the check box content
                Dim contentRect As New System.Drawing.RectangleF(0, 0, rect.Width, rect.Height)
                ' get a reference to "ZapfDingbats" font
                Dim font As Vintasoft.Imaging.Pdf.Tree.Fonts.PdfFont = document.FontManager.GetStandardFont(Vintasoft.Imaging.Pdf.Tree.Fonts.PdfStandardFontType.ZapfDingbats)
                ' create "Yes" appearance of checkbox1
                Using g As Vintasoft.Imaging.Pdf.Drawing.PdfGraphics = checkBox1.CreateYesAppearanceGraphics()
                    g.DrawString("o", font, fontSize, New Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Black), contentRect, Vintasoft.Imaging.Pdf.Drawing.PdfContentAlignment.Center, _
                        False)
                    g.DrawString("4", font, fontSize, New Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Green), contentRect, Vintasoft.Imaging.Pdf.Drawing.PdfContentAlignment.Center, _
                        False)
                End Using
                ' create "Off" appearance of checkbox1
                Using g As Vintasoft.Imaging.Pdf.Drawing.PdfGraphics = checkBox1.CreateOffAppearanceGraphics()
                    g.DrawString("o", font, fontSize, New Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Black), contentRect, Vintasoft.Imaging.Pdf.Drawing.PdfContentAlignment.Center, _
                        False)
                End Using
                ' set value of checkbox1
                checkBox1.Value = "Off"
    
                ' change the vertical position of rectangle that defines check box position on PDF page
                rect.Y -= rect.Height
    
                ' create the second check box
                Dim checkBox2 As New Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormCheckBoxField(document, "CheckBox2", rect)
                ' use checkbox1 appearance as checkbox2 appearance
                checkBox2.Annotation.Appearances = checkBox1.Annotation.Appearances
                ' set value of checkBox2
                checkBox2.Value = "Yes"
    
                ' add the check box fields to the interactive form of document
                document.InteractiveForm.Fields.Add(checkBox1)
                document.InteractiveForm.Fields.Add(checkBox2)
    
                ' add annotations, associated with check box fields, to the page
                page.Annotations = New Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotationList(document)
                page.Annotations.Add(checkBox1.Annotation)
                page.Annotations.Add(checkBox2.Annotation)
    
                ' save the document
                document.Save(filename)
            End Using
        End Sub
    End Class