How to Draw Text in PDF by Using VB.NET
Advertisers often add text with wonderful style for appealing customers, for example, comic style is frequently used in children’s product advertises. And nowadays, we can find various electronic books on the internet. Some texts in e-books also are designed with cute or beautiful style.
If we want to draw text in an electronic document, how should we do? Microsoft Office provides many art fonts with users. Choose one style you like and insert. It is easy. But we need to use some professional tool to draw text in PDFdocuments, for example, Adobe Acrobat.
For general users, these tools are convenient and useful. They just follow the guide and then can get the wanted text style. However, in order to meet customers’ requirements, tool developers need to draw text programmatically. In this post, I want to introduce a method to draw PDF text with C#/VB.NET.
This method is based on a development component: Spire.PDF.
Code:
using System;
using System.Drawing;
using Spire.Pdf;
using Spire.Pdf.Graphics;
namespace DrawText
{
class Program
{
static void Main(string[] args)
{
//Create a pdf document.
PdfDocument doc = new PdfDocument();
// Create one page
PdfPageBase page = doc.Pages.Add();
DrawText(page);
AlignText(page);
AlignTextInRectangle(page);
TransformText(page);
RotateText(page);
//Save doc file.
doc.SaveToFile("DrawText.pdf");
doc.Close();
//Launching the Pdf file.
System.Diagnostics.Process.Start("DrawText.pdf");
}
private static void RotateText(PdfPageBase page)
{
//save graphics state
PdfGraphicsState state = page.Canvas.Save();
//Draw the text - transform
PdfFont font = new PdfFont(PdfFontFamily.Helvetica, 10f);
PdfSolidBrush brush = new PdfSolidBrush(Color.Blue);
PdfStringFormat centerAlignment
= new PdfStringFormat(PdfTextAlignment.Left, PdfVerticalAlignment.Middle);
float x = page.Canvas.ClientSize.Width / 2;
float y = 380;
page.Canvas.TranslateTransform(x, y);
for (int i = 0; i < 12; i++)
{
page.Canvas.RotateTransform(30);
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush, 20, 0, centerAlignment);
}
//restor graphics
page.Canvas.Restore(state);
}
private static void TransformText(PdfPageBase page)
{
//save graphics state
PdfGraphicsState state = page.Canvas.Save();
//Draw the text - transform
PdfFont font = new PdfFont(PdfFontFamily.Helvetica, 18f);
PdfSolidBrush brush1 = new PdfSolidBrush(Color.DeepSkyBlue);
PdfSolidBrush brush2 = new PdfSolidBrush(Color.CadetBlue);
page.Canvas.TranslateTransform(20, 200);
page.Canvas.ScaleTransform(1f, 0.6f);
page.Canvas.SkewTransform(-10, 0);
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush1, 0, 0);
page.Canvas.SkewTransform(10, 0);
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush2, 0, 0);
page.Canvas.ScaleTransform(1f, -1f);
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush2, 0, -2 * 18);
//restor graphics
page.Canvas.Restore(state);
}
private static void AlignTextInRectangle(PdfPageBase page)
{
//Draw the text - align in rectangle
PdfFont font = new PdfFont(PdfFontFamily.Helvetica, 10f);
PdfSolidBrush brush = new PdfSolidBrush(Color.Blue);
RectangleF rctg1 = new RectangleF(0, 70, page.Canvas.ClientSize.Width / 2, 100);
RectangleF rctg2
= new RectangleF(page.Canvas.ClientSize.Width / 2, 70, page.Canvas.ClientSize.Width / 2, 100);
page.Canvas.DrawRectangle(new PdfSolidBrush(Color.LightBlue), rctg1);
page.Canvas.DrawRectangle(new PdfSolidBrush(Color.LightSkyBlue), rctg2);
PdfStringFormat leftAlignment
= new PdfStringFormat(PdfTextAlignment.Left, PdfVerticalAlignment.Top);
page.Canvas.DrawString("Left! Left!", font, brush, rctg1, leftAlignment);
page.Canvas.DrawString("Left! Left!", font, brush, rctg2, leftAlignment);
PdfStringFormat rightAlignment
= new PdfStringFormat(PdfTextAlignment.Right, PdfVerticalAlignment.Middle);
page.Canvas.DrawString("Right! Right!", font, brush, rctg1, rightAlignment);
page.Canvas.DrawString("Right! Right!", font, brush, rctg2, rightAlignment);
PdfStringFormat centerAlignment
= new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Bottom);
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush, rctg1, centerAlignment);
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush, rctg2, centerAlignment);
}
private static void AlignText(PdfPageBase page)
{
//Draw the text - alignment
PdfFont font = new PdfFont(PdfFontFamily.Helvetica, 20f);
PdfSolidBrush brush = new PdfSolidBrush(Color.Blue);
PdfStringFormat leftAlignment = new PdfStringFormat(PdfTextAlignment.Left, PdfVerticalAlignment.Middle);
page.Canvas.DrawString("Left!", font, brush, 0, 20, leftAlignment);
page.Canvas.DrawString("Left!", font, brush, 0, 50, leftAlignment);
PdfStringFormat rightAlignment = new PdfStringFormat(PdfTextAlignment.Right, PdfVerticalAlignment.Middle);
page.Canvas.DrawString("Right!", font, brush, page.Canvas.ClientSize.Width, 30, rightAlignment);
page.Canvas.DrawString("Right!", font, brush, page.Canvas.ClientSize.Width, 60, rightAlignment);
PdfStringFormat centerAlignment
= new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle);
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!",
font, brush, page.Canvas.ClientSize.Width / 2, 40, centerAlignment);
}
private static void DrawText(PdfPageBase page)
{
//save graphics state
PdfGraphicsState state = page.Canvas.Save();
//Draw text - brush
String text = "Go! Turn Around! Go! Go! Go!";
PdfPen pen = PdfPens.DeepSkyBlue;
PdfSolidBrush brush = new PdfSolidBrush(Color.White);
PdfStringFormat format = new PdfStringFormat();
PdfFont font = new PdfFont(PdfFontFamily.Helvetica, 18f, PdfFontStyle.Italic);
SizeF size = font.MeasureString(text, format);
RectangleF rctg
= new RectangleF(page.Canvas.ClientSize.Width / 2 + 10, 180,
size.Width / 3 * 2, size.Height * 2);
page.Canvas.DrawString(text, font, pen, brush, rctg, format);
//restor graphics
page.Canvas.Restore(state);
}
}
}
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