The sample demonstrates how to work with font in PDF document.

Download Font.pdf

using System;
using System.Drawing;
using Spire.Pdf;
using Spire.Pdf.Graphics;

namespace Font
{
    class Program
    {
        static void Main(string[] args)
        {

            //Create a pdf document.
            PdfDocument doc = new PdfDocument();

            // Create one page
            PdfPageBase page = doc.Pages.Add();

            //Draw the text
            float l = page.Canvas.ClientSize.Width / 2;
            PointF center = new PointF(l, l);
            float r = (float)Math.Sqrt(2 * l * l);
            PdfRadialGradientBrush brush
                = new PdfRadialGradientBrush(center, 0f, center, r, Color.Blue, Color.Red);
            PdfFontFamily[] fontFamilies
                = (PdfFontFamily[])Enum.GetValues(typeof(PdfFontFamily));
            float y = 10;
            for (int i = 0; i < fontFamilies.Length; i++)
            {
                String text = String.Format("Font Family: {0}", fontFamilies[i]);
                float x1 = 0;
                y = 10 + i * 16;
                PdfFont font1 = new PdfFont(PdfFontFamily.Courier, 14f);
                PdfFont font2 = new PdfFont(fontFamilies[i], 14f);
                float x2 = x1 + 10 + font1.MeasureString(text).Width;
                page.Canvas.DrawString(text, font1, brush, x1, y);
                page.Canvas.DrawString(text, font2, brush, x2, y);
            }

            //true type font - embedded.
            System.Drawing.Font font = new System.Drawing.Font("Arial", 14f, FontStyle.Bold);
            PdfTrueTypeFont trueTypeFont = new PdfTrueTypeFont(font);
            page.Canvas.DrawString("Font Family: Arial - Embedded", trueTypeFont, brush, 0, (y = y + 16f));

            //right to left
            String arabicText
                = "\u0627\u0644\u0630\u0647\u0627\u0628\u0021\u0020"
                + "\u0628\u062F\u0648\u0631\u0647\u0020\u062D\u0648\u0644\u0647\u0627\u0021\u0020"
                + "\u0627\u0644\u0630\u0647\u0627\u0628\u0021\u0020"
                + "\u0627\u0644\u0630\u0647\u0627\u0628\u0021\u0020"
                + "\u0627\u0644\u0630\u0647\u0627\u0628\u0021";
            trueTypeFont = new PdfTrueTypeFont(font, true);
            RectangleF rctg = new RectangleF(new PointF(0, (y = y + 16f)), page.Canvas.ClientSize);
            PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Right);
            format.RightToLeft = true;
            page.Canvas.DrawString(arabicText, trueTypeFont, brush, rctg, format);

            //true type font - not embedded
            font = new System.Drawing.Font("Batang", 14f, FontStyle.Italic);
            trueTypeFont = new PdfTrueTypeFont(font);
            page.Canvas.DrawString("Font Family: Batang - Not Embedded", trueTypeFont, brush, 0, (y = y + 16f));

            //font file
            String fontFileName = "Hawaii_Killer.ttf";
            trueTypeFont = new PdfTrueTypeFont(fontFileName, 20f);
            page.Canvas.DrawString("Hawaii Killer Font", trueTypeFont, brush, 0, (y = y + 16f));
            page.Canvas.DrawString("Hawaii Killer Font, from http://www.1001freefonts.com",
                new PdfFont(PdfFontFamily.Helvetica, 8f), brush, 10, (y = y + 20f));

            //cjk font
            PdfCjkStandardFont cjkFont = new PdfCjkStandardFont(PdfCjkFontFamily.MonotypeHeiMedium, 14f);
            page.Canvas.DrawString("How to say 'Font' in Chinese? \u5B57\u4F53",
                cjkFont, brush, 0, (y = y + 16f));

            cjkFont = new PdfCjkStandardFont(PdfCjkFontFamily.HanyangSystemsGothicMedium, 14f);
            page.Canvas.DrawString("How to say 'Font' in Japanese? \u30D5\u30A9\u30F3\u30C8",
                cjkFont, brush, 0, (y = y + 16f));

            cjkFont = new PdfCjkStandardFont(PdfCjkFontFamily.HanyangSystemsShinMyeongJoMedium, 14f);
            page.Canvas.DrawString("How to say 'Font' in Korean? \uAE00\uAF34",
                cjkFont, brush, 0, (y = y + 16f));

            //Save pdf file.
            doc.SaveToFile("Font.pdf");
            doc.Close();

            //Launching the Pdf file.
            System.Diagnostics.Process.Start("Font.pdf");
        }
    }
}

Imports System.Drawing
Imports Spire.Pdf
Imports Spire.Pdf.Graphics

Namespace FontFormat
    Friend Class Program
        Shared Sub Main(ByVal args() As String)
            'Create a pdf document.
            Dim doc As New PdfDocument()

            ' Create one page
            Dim page As PdfPageBase = doc.Pages.Add()

            'Draw the text
            Dim l As Single = page.Canvas.ClientSize.Width / 2
            Dim center As New PointF(l, l)
            Dim r As Single = CSng(Math.Sqrt(2 * l * l))
            Dim brush As New PdfRadialGradientBrush(center, 0.0F, center, r, Color.Blue, Color.Red)
            Dim fontFamilies() As PdfFontFamily _
                = CType(System.Enum.GetValues(GetType(PdfFontFamily)), PdfFontFamily())
            Dim y As Single = 10
            For i As Integer = 0 To fontFamilies.Length - 1
                Dim text As String = String.Format("Font Family: {0}", fontFamilies(i))
                Dim x1 As Single = 0
                y = 10 + i * 16
                Dim font1 As New PdfFont(PdfFontFamily.Courier, 14.0F)
                Dim font2 As New PdfFont(fontFamilies(i), 14.0F)
                Dim x2 As Single = x1 + 10 + font1.MeasureString(text).Width
                page.Canvas.DrawString(text, font1, brush, x1, y)
                page.Canvas.DrawString(text, font2, brush, x2, y)
            Next i

            'true type font - embedded.
            Dim font As New System.Drawing.Font("Arial", 14.0F, FontStyle.Bold)
            Dim trueTypeFont As New PdfTrueTypeFont(font)
            y = y + 16.0F
            page.Canvas.DrawString("Font Family: Arial - Embedded", trueTypeFont, brush, 0, y)


            'right to left
            Dim arabicText As String _
                = ChrW(&H627).ToString() & ChrW(&H644).ToString() & ChrW(&H630).ToString() _
                & ChrW(&H647).ToString() & ChrW(&H627).ToString() & ChrW(&H628).ToString() _
                & ChrW(&H21).ToString() & ChrW(&H20).ToString() & ChrW(&H628).ToString() _
                & ChrW(&H62F).ToString() & ChrW(&H648).ToString() & ChrW(&H631).ToString() _
                & ChrW(&H647).ToString() & ChrW(&H20).ToString() & ChrW(&H62D).ToString() _
                & ChrW(&H648).ToString() & ChrW(&H644).ToString() & ChrW(&H647).ToString() _
                & ChrW(&H627).ToString() & ChrW(&H21).ToString() & ChrW(&H20).ToString() _
                & ChrW(&H627).ToString() & ChrW(&H644).ToString() & ChrW(&H630).ToString() _
                & ChrW(&H647).ToString() & ChrW(&H627).ToString() & ChrW(&H628).ToString() _
                & ChrW(&H21).ToString() & ChrW(&H20).ToString() & ChrW(&H627).ToString() _
                & ChrW(&H644).ToString() & ChrW(&H630).ToString() & ChrW(&H647).ToString() _
                & ChrW(&H627).ToString() & ChrW(&H628).ToString() & ChrW(&H21).ToString() _
                & ChrW(&H20).ToString() & ChrW(&H627).ToString() & ChrW(&H644).ToString() _
                & ChrW(&H630).ToString() & ChrW(&H647).ToString() & ChrW(&H627).ToString() _
                & ChrW(&H628).ToString() & ChrW(&H21).ToString()
            trueTypeFont = New PdfTrueTypeFont(font, True)
            y = y + 16.0F
            Dim rctg As New RectangleF(New PointF(0, y), page.Canvas.ClientSize)
            Dim format As New PdfStringFormat(PdfTextAlignment.Right)
            format.RightToLeft = True
            page.Canvas.DrawString(arabicText, trueTypeFont, brush, rctg, format)

            'true type font - not embedded
            font = New System.Drawing.Font("Batang", 14.0F, FontStyle.Italic)
            trueTypeFont = New PdfTrueTypeFont(font)
            y = y + 16.0F
            page.Canvas.DrawString("Font Family: Batang - Not Embedded", trueTypeFont, brush, 0, y)
            'font file
            Dim fontFileName As String = "Hawaii_Killer.ttf"
            trueTypeFont = New PdfTrueTypeFont(fontFileName, 20.0F)
            y = y + 16.0F
            page.Canvas.DrawString("Hawaii Killer Font", trueTypeFont, brush, 0, y)
            y = y + 20.0F
            page.Canvas.DrawString("Hawaii Killer Font, from http://www.1001freefonts.com", _
                                   New PdfFont(PdfFontFamily.Helvetica, 8.0F), brush, 10, y)

            'cjk font
            Dim cjkFont As New PdfCjkStandardFont(PdfCjkFontFamily.MonotypeHeiMedium, 14.0F)
            y = y + 16.0F
            page.Canvas.DrawString("How to say 'Font' in Chinese? " _
                                   & ChrW(&H5B57).ToString() & ChrW(&H4F53).ToString(), cjkFont, brush, 0, y)

            cjkFont = New PdfCjkStandardFont(PdfCjkFontFamily.HanyangSystemsGothicMedium, 14.0F)
            y = y + 16.0F
            page.Canvas.DrawString("How to say 'Font' in Japanese? " _
                                   & ChrW(&H30D5).ToString() & ChrW(&H30A9).ToString() _
                                   & ChrW(&H30F3).ToString() & ChrW(&H30C8).ToString(), cjkFont, brush, 0, y)

            cjkFont = New PdfCjkStandardFont(PdfCjkFontFamily.HanyangSystemsShinMyeongJoMedium, 14.0F)
            y = y + 16.0F
            page.Canvas.DrawString("How to say 'Font' in Korean? " _
                                   & ChrW(&HAE00).ToString() & ChrW(&HAF34).ToString(), cjkFont, brush, 0, y)

            'Save pdf file.
            doc.SaveToFile("Font.pdf")
            doc.Close()

            'Launching the Pdf file.
            Process.Start("Font.pdf")
        End Sub
    End Class
End Namespace

The sample demonstrates how to overlay one page on another and set transparency mode.

Download Overlay.pdf

using System.Drawing;
using Spire.Pdf;
using Spire.Pdf.Graphics;

namespace Overlay
{
    class Program
    {
        static void Main(string[] args)
        {
            //load two document
            PdfDocument doc1 = new PdfDocument();
            doc1.LoadFromFile("Sample1.pdf");

            PdfDocument doc2 = new PdfDocument();
            doc2.LoadFromFile("Sample3.pdf");

            //Create page template
            PdfTemplate template = doc1.Pages[0].CreateTemplate();

            foreach (PdfPageBase page in doc2.Pages)
            {
                page.Canvas.SetTransparency(0.25f, 0.25f, PdfBlendMode.Overlay);
                page.Canvas.DrawTemplate(template, PointF.Empty);
            }

            //Save pdf file.
            doc2.SaveToFile("Overlay.pdf");
            doc1.Close();
            doc2.Close();

            //Launching the Pdf file.
            System.Diagnostics.Process.Start("Overlay.pdf");
        }
    }
}

Imports System.Drawing
Imports Spire.Pdf
Imports Spire.Pdf.Graphics

Namespace Overlay
    Friend Class Program
        Shared Sub Main(ByVal args() As String)
            'load two document
            Dim doc1 As New PdfDocument()
            doc1.LoadFromFile("Sample1.pdf")

            Dim doc2 As New PdfDocument()
            doc2.LoadFromFile("Sample3.pdf")

            'Create page template
            Dim template As PdfTemplate = doc1.Pages(0).CreateTemplate()

            For Each page As PdfPageBase In doc2.Pages
                page.Canvas.SetTransparency(0.25F, 0.25F, PdfBlendMode.Overlay)
                page.Canvas.DrawTemplate(template, PointF.Empty)
            Next page

            'Save pdf file.
            doc2.SaveToFile("Overlay.pdf")
            doc1.Close()
            doc2.Close()

            'Launching the Pdf file.
            Process.Start("Overlay.pdf")
        End Sub
    End Class
End Namespace

The sample shows the different modes of transparency.

Download Transparency.pdf

using System;
using System.Drawing;
using Spire.Pdf;
using Spire.Pdf.Graphics;

namespace Transparency
{
    class Program
    {
        static void Main(string[] args)
        {

            //Create a pdf document.
            PdfDocument doc = new PdfDocument();

            // Create one section
            PdfSection section = doc.Sections.Add();

            //Load image
            PdfImage image = PdfImage.FromFile("SalesReportChart.png");
            float imageWidth = image.PhysicalDimension.Width / 2;
            float imageHeight = image.PhysicalDimension.Height / 2;
            foreach (PdfBlendMode mode in Enum.GetValues(typeof(PdfBlendMode)))
            {
                PdfPageBase page = section.Pages.Add();
                float pageWidth = page.Canvas.ClientSize.Width;
                float y = 0;

                //title
                y = y + 5;
                PdfBrush brush = new PdfSolidBrush(Color.OrangeRed);
                PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial", 12f, FontStyle.Bold));
                PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Center);
                String text = String.Format("Transparency Blend Mode: {0}", mode);
                page.Canvas.DrawString(text, font, brush, pageWidth / 2, y, format);
                SizeF size = font.MeasureString(text, format);
                y = y + size.Height + 6;

                page.Canvas.DrawImage(image, 0, y, imageWidth, imageHeight);
                page.Canvas.Save();
                float d = (page.Canvas.ClientSize.Width - imageWidth) / 5;
                float x = d;
                y = y + d / 2;
                for (int i = 0; i < 5; i++)
                {
                    float alpha = 1.0f / 6 * (5 - i);
                    page.Canvas.SetTransparency(alpha, alpha, mode);
                    page.Canvas.DrawImage(image, x, y, imageWidth, imageHeight);
                    x = x + d;
                    y = y + d / 2;
                }
                page.Canvas.Restore();
            }

            //Save pdf file.
            doc.SaveToFile("Transparency.pdf");
            doc.Close();

            //Launching the Pdf file.
            System.Diagnostics.Process.Start("Transparency.pdf");
        }
    }
}

Imports System.Drawing
Imports Spire.Pdf
Imports Spire.Pdf.Graphics

Namespace Transparency
    Friend Class Program
        Shared Sub Main(ByVal args() As String)

            'Create a pdf document.
            Dim doc As New PdfDocument()

            ' Create one section
            Dim section As PdfSection = doc.Sections.Add()

            'Load image
            Dim image As PdfImage = PdfImage.FromFile("SalesReportChart.png")
            Dim imageWidth As Single = image.PhysicalDimension.Width \ 2
            Dim imageHeight As Single = image.PhysicalDimension.Height \ 2
            For Each mode As PdfBlendMode In System.Enum.GetValues(GetType(PdfBlendMode))
                Dim page As PdfPageBase = section.Pages.Add()
                Dim pageWidth As Single = page.Canvas.ClientSize.Width
                Dim y As Single = 0

                'title
                y = y + 5
                Dim brush As PdfBrush = New PdfSolidBrush(Color.OrangeRed)
                Dim font As New PdfTrueTypeFont(New Font("Arial", 12.0F, FontStyle.Bold))
                Dim format As New PdfStringFormat(PdfTextAlignment.Center)
                Dim text As String = String.Format("Transparency Blend Mode: {0}", mode)
                page.Canvas.DrawString(text, font, brush, pageWidth / 2, y, format)
                Dim size As SizeF = font.MeasureString(text, format)
                y = y + size.Height + 6

                page.Canvas.DrawImage(image, 0, y, imageWidth, imageHeight)
                page.Canvas.Save()
                Dim d As Single = (page.Canvas.ClientSize.Width - imageWidth) / 5
                Dim x As Single = d
                y = y + d / 2
                For i As Integer = 0 To 4
                    Dim alpha As Single = 1.0F / 6 * (5 - i)
                    page.Canvas.SetTransparency(alpha, alpha, mode)
                    page.Canvas.DrawImage(image, x, y, imageWidth, imageHeight)
                    x = x + d
                    y = y + d / 2
                Next i
                page.Canvas.Restore()
            Next mode

            'Save pdf file.
            doc.SaveToFile("Transparency.pdf")
            doc.Close()

            'Launching the Pdf file.
            Process.Start("Transparency.pdf")
        End Sub
    End Class
End Namespace