Creating a complex PDF

The Hello, World example showed simple steps to create a PDF document using Java and Aspose.PDF. In this article, we will take a look at creating a more complex document with Java and Aspose.PDF for Java. As an example, we’ll take a document from a fictitious company that operates passenger ferry services. Our document will contain a image, two text fragments (header and paragraph), and a table. To build such a document, we will use DOM-base approach. You can read more in section Basics of DOM API.

If we create a document from scratch we need to follow certain steps:

1. Instantiate a Document object. In this step we will create an empty PDF document with some metadata but without pages.
2. Add a Page to the document object. So, now our document will have one page.
3. Add a Image. It’s a complex operation based on low level actions with PDF operators.
   • Load image from stream
   • Add image to Images collection of Page Resources
   • Using GSave operator: this operator saves current graphics state.
   • Create a Matrix object.
   • Using ConcatenateMatrix operator: defines how image must be placed.
   • Using Do operator: this operator draws image.
   • Using GRestore operator: this operator restores graphics state.
4. Create a TextFragment for header. For the header we will use Arial font with font size 24pt and center alignment.
5. Add header to the page Paragraphs.
6. Create a TextFragment for description. For the description we will use Arial font with font size 24pt and center alignment.
7. Add (description) to the page Paragraphs.
8. Create a table, add table properties.
9. Add (table) to the page Paragraphs.
10. Save a document “Complex.pdf”.

package com.aspose.pdf.examples;

/**
 * Complex Example
 */

import java.io.FileNotFoundException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.Duration;
import java.time.LocalTime;

import com.aspose.pdf.*;
import com.aspose.pdf.operators.ConcatenateMatrix;
import com.aspose.pdf.operators.Do;
import com.aspose.pdf.operators.GRestore;
import com.aspose.pdf.operators.GSave;

public final class ComplexExample {

    private ComplexExample() {
    }

    private static Path _dataDir = Paths.get("/home/admin1/pdf-examples/");

    public static void main(String[] args) throws FileNotFoundException {
        // Initialize document object
        Document document = new Document();
        // Add page
        Page page = document.getPages().add();

        // -------------------------------------------------------------
        // Add image
        Path imageFileName = Paths.get(_dataDir.toString(),"logo.png");
        java.io.FileInputStream imageStream = new java.io.FileInputStream(new java.io.File(imageFileName.toString()));
        // Add image to Images collection of Page Resources
        page.getResources().getImages().add(imageStream);

        // Using GSave operator: this operator saves current graphics state
        page.getContents().add(new GSave());
        Rectangle _logoPlaceHolder = new Rectangle(20, 730, 120, 830);

        // Create Matrix object
        Matrix matrix = new Matrix(new double[] {
            _logoPlaceHolder.getURX() - _logoPlaceHolder.getLLX(), 0, 0,
            _logoPlaceHolder.getURY() - _logoPlaceHolder.getLLY(),
            _logoPlaceHolder.getLLX(), _logoPlaceHolder.getLLY() });

        // Using ConcatenateMatrix (concatenate matrix) operator: defines how image must be placed
        page.getContents().add(new ConcatenateMatrix(matrix));
        XImage ximage = page.getResources().getImages().get_Item(page.getResources().getImages().size());
        // Using Do operator: this operator draws image
        page.getContents().add(new Do(ximage.getName()));
        // Using GRestore operator: this operator restores graphics state
        page.getContents().add(new GRestore());

        // -------------------------------------------------------------
        // Add Header
        TextFragment header = new TextFragment("New ferry routes in Fall 2020");
        header.getTextState().setFont(FontRepository.findFont("Arial"));
        header.getTextState().setFontSize(24);
        header.setHorizontalAlignment (HorizontalAlignment.Center);
        header.setPosition(new Position(130, 720));
        page.getParagraphs().add(header);

        // Add description
        String descriptionText = "Visitors must buy tickets online and tickets are limited to 5,000 per day. Ferry service is operating at half capacity and on a reduced schedule. Expect lineups.";
        TextFragment description = new TextFragment(descriptionText);
        description.getTextState().setFont(FontRepository.findFont("Times New Roman"));
        description.getTextState().setFontSize(14);
        description.setHorizontalAlignment(HorizontalAlignment.Left);
        page.getParagraphs().add(description);


        // Add table
        Table table = new Table();
        table.setColumnWidths("200");
        table.setBorder(new BorderInfo(BorderSide.Box, 1f, Color.getDarkSlateGray()));
        table.setDefaultCellBorder(new BorderInfo(BorderSide.Box, 0.5f, Color.getBlack()));
        table.getMargin().setBottom(10);
        table.getDefaultCellTextState().setFont(FontRepository.findFont("Helvetica"));

        Row headerRow = table.getRows().add();
        headerRow.getCells().add("Departs City");
        headerRow.getCells().add("Departs Island");

        for (Cell headerRowCell : headerRow.getCells())
        {
            headerRowCell.setBackgroundColor(Color.getGray());
            headerRowCell.getDefaultCellTextState().setForegroundColor(Color.getWhiteSmoke());
        }

        LocalTime time = LocalTime.of(6,0);
        Duration incTime = Duration.ofMinutes(30);

        for (int i = 0; i < 10; i++)
        {
            Row dataRow = table.getRows().add();
            dataRow.getCells().add(time.toString());
            time=time.plus(incTime);
            dataRow.getCells().add(time.toString());
        }

        page.getParagraphs().add(table);

        document.save(Paths.get(_dataDir.toString(), "Complex.pdf").toString());
    }

}