ColumnText and the font ascender

JAVA

/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 Apryse Group NV
    Authors: Apryse Software.

    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
package com.itextpdf.samples.sandbox.objects;

import com.itextpdf.kernel.colors.ColorConstants;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.ColumnDocumentRenderer;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Paragraph;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class ColumnTextAscender {
    public static final String DEST = "./target/sandbox/objects/column_text_ascender.pdf";

    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new ColumnTextAscender().manipulatePdf(DEST);
    }

    protected void manipulatePdf(String dest) throws IOException {
        PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
        Document doc = new Document(pdfDoc);

        Rectangle[] areas = new Rectangle[]{
                new Rectangle(50, 750, 200, 50),
                new Rectangle(300, 750, 200, 50)
        };

        // For canvas usage one should create a page
        pdfDoc.addNewPage();
        for (Rectangle rect : areas) {
            new PdfCanvas(pdfDoc.getFirstPage()).setLineWidth(0.5f).setStrokeColor(ColorConstants.RED).rectangle(rect).stroke();
        }

        doc.setRenderer(new ColumnDocumentRenderer(doc, areas));
        addColumn(doc, false);
        addColumn(doc, true);
        doc.close();
    }

    private static void addColumn(Document doc, boolean useAscender) {
        Paragraph p = new Paragraph("This text is added at the top of the column.");

        // setUseAscender (boolean) - this is the approach used in iText5.
        // We can change leading instead, the result will be the same
        if (useAscender) {
            p.setMargin(0);

            // The Leading is a spacing between lines of text
            p.setMultipliedLeading(1);
        }

        doc.add(p);
    }
}

C#

using System.IO;
using iText.Kernel.Colors;
using iText.Kernel.Geom;
using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Canvas;
using iText.Layout;
using iText.Layout.Element;

namespace iText.Samples.Sandbox.Objects
{
    public class ColumnTextAscender
    {
        public static readonly string DEST = "results/sandbox/objects/column_text_ascender.pdf";

        public static void Main(string[] args)
        {
            FileInfo file = new FileInfo(DEST);
            file.Directory.Create();
            new ColumnTextAscender().ManipulatePdf(DEST);
        }

        protected void ManipulatePdf(string dest)
        {
            PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
            Document doc = new Document(pdfDoc);

            Rectangle[] areas = new Rectangle[]
            {
                new Rectangle(50, 750, 200, 50),
                new Rectangle(300, 750, 200, 50)
            };

            // For canvas usage one should create a page
            pdfDoc.AddNewPage();
            foreach (Rectangle rect in areas)
            {
                new PdfCanvas(pdfDoc.GetFirstPage()).SetLineWidth(0.5f).SetStrokeColor(ColorConstants.RED)
                    .Rectangle(rect).Stroke();
            }

            doc.SetRenderer(new ColumnDocumentRenderer(doc, areas));
            AddColumn(doc, false);
            AddColumn(doc, true);
            doc.Close();
        }

        private static void AddColumn(Document doc, bool useAscender)
        {
            Paragraph p = new Paragraph("This text is added at the top of the column.");
            
            // SetUseAscender (boolean) - this is the approach used in iText5.
            // We can change leading instead, the result will be the same
            if (useAscender)
            {
                p.SetMargin(0);
                
                // The Leading is a spacing between lines of text
                p.SetMultipliedLeading(1);
            }

            doc.Add(p);
        }
    }
}