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In this article, we're going to demonstrate how to draw superscript and subscript text in PDF using Spire.PDF.
Draw Superscript Text
using Spire.Pdf;
using Spire.Pdf.Graphics;
using System.Drawing;
namespace Superscript
{
class Program
{
static void Main(string[] args)
{
//Instantiate a PdfDocument instance
PdfDocument pdf = new PdfDocument();
//Add a page
PdfPageBase page = pdf.Pages.Add();
//Set initial (x, y) coordinate
float x = 0;
float y = 50;
//Set font
PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial Unicode MS", 11f), true);
//Draw string
string text = "Sample Text";
page.Canvas.DrawString(text, font, PdfBrushes.Black, new PointF(x, y));
//Measure the string
SizeF size = font.MeasureString(text);
//Set the x coordinate of the superscript text
x += size.Width;
//Instantiate a PdfStringFormat instance
PdfStringFormat format = new PdfStringFormat();
//Set format as superscript
format.SubSuperScript = PdfSubSuperScript.SuperScript;
//Draw superscript text with format
text = "Superscript";
page.Canvas.DrawString(text, font, PdfBrushes.Black, new PointF(x, y), format);
//Save the document
pdf.SaveToFile("SuperScript.pdf");
}
}
}
Draw Superscript Text
using Spire.Pdf;
using Spire.Pdf.Graphics;
using System.Drawing;
namespace Subscript
{
class Program
{
static void Main(string[] args)
{
//Instantiate a PdfDocument instance
PdfDocument pdf = new PdfDocument();
//Add a page
PdfPageBase page = pdf.Pages.Add();
//Set initial (x, y) coordinate
float x = 0;
float y = 50;
//Set font
PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial Unicode MS", 11f), true);
//Draw string
string text = "Sample Text";
page.Canvas.DrawString(text, font, PdfBrushes.Black, new PointF(x, y));
//Measure the string
SizeF size = font.MeasureString(text);
//Set the x coordinate of the subscript text
x += size.Width;
//Instantiate a PdfStringFormat instance
PdfStringFormat format = new PdfStringFormat();
//Set format as subscript
format.SubSuperScript = PdfSubSuperScript.SubScript;
//Draw subscript
text = "Subscript";
page.Canvas.DrawString(text, font, PdfBrushes.Black, new PointF(x, y), format);
//Save the document
pdf.SaveToFile("SubScript.pdf");
}
}
}
PDF is a file format developed by Adobe in 1992, and during the years, it has undergone a lot of changes. Sometimes you may find that some devices have strict requirements on the PDF version. In such a case, it's necessary to change the PDF file to a different version for compatibility purpose. This article will show how to programmatically change the PDF version using Spire.PDF for Java.
Install Spire.PDF for Java
First of all, you're required to add the Spire.Pdf.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.
<repositories>
<repository>
<id>com.e-iceblue</id>
<name>e-iceblue</name>
<url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>e-iceblue</groupId>
<artifactId>spire.pdf</artifactId>
<version>12.6.4</version>
</dependency>
</dependencies>
Change PDF Version
Spire.PDF for Java supports the PDF versions from 1.0 to 1.7. The following are the detailed steps to change the PDF version.
- Create a PdfDocument object.
- Load a sample PDF file using PdfDocument.loadFromFile() method.
- Change the PDF file to another version using PdfDocument.getFileInfo().setVersion() method.
- Save the document to another file using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.*;
public class ChangePdfVersion {
public static void main(String[] args) {
//Create a PdfDocument object
PdfDocument document = new PdfDocument();
//Load a sample PDF file
document.loadFromFile("sample.pdf");
//Change the PDF to version 1.5
document.getFileInfo().setVersion(PdfVersion.Version_1_5);
//Save to file
document.saveToFile("PdfVersion.pdf", FileFormat.PDF);
document.close();
}
}
Apply for a Temporary License
If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.
This article demonstrates how to use Spire. PDF for Java to add header and footer when creating new PDF document in Java applications.
Spire.PDF has a class named PdfPageTemplateElement, which represents a page template element that can be used as header, footer, watermark or stamp. The template can contain text, image as well as dynamic fields like PdfPageCountField, PdfPageNumberField, etc. We use text string for the header and dynamic fields for the footer in the following example.
import java.awt.*;
import java.awt.geom.Dimension2D;
import com.spire.pdf.*;
import com.spire.pdf.automaticfields.PdfAutomaticField;
import com.spire.pdf.automaticfields.PdfCompositeField;
import com.spire.pdf.automaticfields.PdfPageCountField;
import com.spire.pdf.automaticfields.PdfPageNumberField;
import com.spire.pdf.graphics.*;
public class PDFHeaderFooter {
public static void main(String[] args) throws Exception {
//create a PdfDocument object
PdfDocument doc = new PdfDocument();
//Set margins
PdfMargins margin = new PdfMargins(60,60,40,40);
//Call the method addHeaderAndFooter() to add header and footer
addHeaderAndFooter(doc, PdfPageSize.A4, margin);
//Add two pages to the PDF document and draw string to it.
PdfPageBase page1 = doc.getPages().add();
PdfPageBase page2 = doc.getPages().add();
PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial", Font.PLAIN, 14));
String text1 = "Demo of Spire.PDF";
String text2 = "How to add header and footer to PDF in JAVA";
page1.getCanvas().drawString(text1, font, PdfBrushes.getBlack(),0,0);
page2.getCanvas().drawString(text2, font, PdfBrushes.getBlack(),0,0);
//Save the document
doc.saveToFile("output/headerFooter.pdf");
doc.close();
}
static void addHeaderAndFooter(PdfDocument doc, Dimension2D pageSize, PdfMargins margin) {
PdfPageTemplateElement header = new PdfPageTemplateElement(margin.getLeft(), pageSize.getHeight());
doc.getTemplate().setLeft(header);
PdfPageTemplateElement topSpace = new PdfPageTemplateElement(pageSize.getWidth(), margin.getTop());
topSpace.setForeground(true);
doc.getTemplate().setTop(topSpace);
//Draw header label
PdfTrueTypeFont font= new PdfTrueTypeFont(new Font("Arial",Font.PLAIN,12));
PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Left);
String label = "E-iceblue Co.,Ltd";
Dimension2D dimension2D = new Dimension();
dimension2D.setSize(font.measureString(label, format));
float y = topSpace.getHeight() - font.getHeight() - 1;
PdfPen pen = new PdfPen(new PdfRGBColor(Color.black), 0.75f);
topSpace.getGraphics().setTransparency(0.5f);
topSpace.getGraphics().drawLine(pen, margin.getLeft(), y, pageSize.getWidth() - margin.getRight(), y);
y = y - 1 - (float) dimension2D.getHeight();
topSpace.getGraphics().drawString(label, font, PdfBrushes.getBlack(), margin.getLeft(), y, format);
PdfPageTemplateElement rightSpace = new PdfPageTemplateElement(margin.getRight(), pageSize.getHeight());
doc.getTemplate().setRight(rightSpace);
//Draw dynamic fields as footer
PdfPageTemplateElement footer = new PdfPageTemplateElement(pageSize.getWidth(), margin.getBottom());
footer.setForeground(true);
doc.getTemplate().setBottom(footer);
y = font.getHeight() + 1;
footer.getGraphics().setTransparency(0.5f);
footer.getGraphics().drawLine(pen, margin.getLeft(), y, pageSize.getWidth() - margin.getRight(), y);
y = y + 1;
PdfPageNumberField pageNumber = new PdfPageNumberField();
PdfPageCountField pageCount = new PdfPageCountField();
PdfCompositeField pageNumberLabel = new PdfCompositeField();
pageNumberLabel.setAutomaticFields(new PdfAutomaticField[]{pageNumber, pageCount});
pageNumberLabel.setBrush(PdfBrushes.getBlack());
pageNumberLabel.setFont(font);
format = new PdfStringFormat(PdfTextAlignment.Right);
pageNumberLabel.setStringFormat(format);
pageNumberLabel.setText("page {0} of {1}");
pageNumberLabel.setBounds(footer.getBounds());
pageNumberLabel.draw(footer.getGraphics(), - margin.getLeft(), y);
}
}
Effective screenshot after adding header and footer to the new PDF document in JAVA application:
