Vertical text

/*
    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.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.AreaBreak;
import com.itextpdf.layout.element.Cell;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Table;
import com.itextpdf.layout.layout.LayoutArea;
import com.itextpdf.layout.layout.LayoutContext;
import com.itextpdf.layout.layout.LayoutResult;
import com.itextpdf.layout.properties.UnitValue;
import com.itextpdf.layout.renderer.IRenderer;
import com.itextpdf.layout.renderer.TableRenderer;

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

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

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

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

        Cell cell = new Cell();
        for (int i = 1; i <= 5; i++) {
            cell.add(new Paragraph("Line " + i));
        }

        Table table = new Table(UnitValue.createPercentArray(1)).useAllAvailableWidth();
        table.addCell(cell);
        table.addCell(cell.clone(true));
        table.addCell(cell.clone(true));
        table.setNextRenderer(new CustomTableRenderer(table, resolveTableRect(doc, table)));
        doc.add(table);
        doc.add(new AreaBreak());

        table = new Table(UnitValue.createPercentArray(1)).useAllAvailableWidth();
        table.addCell(cell.clone(true));
        table.addCell(cell.clone(true));
        table.addCell(cell.clone(true));
        table.addCell(cell.clone(true));
        table.addCell(cell.clone(true));
        table.addCell(cell.clone(true));
        table.addCell(cell.clone(true));
        table.addCell(cell.clone(true));
        table.addCell(cell.clone(true));
        table.addCell(cell.clone(true));
        table.setNextRenderer(new CustomTableRenderer(table, resolveTableRect(doc, table)));
        doc.add(table);

        doc.close();
    }

    private static Rectangle resolveTableRect(Document doc, Table table) {
        Rectangle pageDimension = new Rectangle(36, 36, 523, 770);
        IRenderer tableRenderer = table.createRendererSubTree().setParent(doc.getRenderer());
        LayoutResult tableLayoutResult = tableRenderer.layout(new LayoutContext(new LayoutArea(0, pageDimension)));

        Rectangle resultRect;
        if (LayoutResult.PARTIAL == tableLayoutResult.getStatus()) {
            resultRect = pageDimension;
        } else {
            Rectangle tableBBox = tableLayoutResult.getOccupiedArea().getBBox();
            resultRect = new Rectangle(pageDimension.getX(), ((tableBBox.getBottom() + pageDimension.getX()) / 2),
                    pageDimension.getWidth(), tableBBox.getHeight());
        }
        return resultRect;
    }

    protected class CustomTableRenderer extends TableRenderer {
        protected Rectangle rect;

        public CustomTableRenderer(Table modelElement, Rectangle rect) {
            super(modelElement);
            this.rect = new Rectangle(rect);
        }

        // If a renderer overflows on the next area, iText uses #getNextRenderer() method to create a new renderer for the overflow part.
        // If #getNextRenderer() isn't overridden, the default method will be used and thus the default rather than the custom
        // renderer will be created
        @Override
        public IRenderer getNextRenderer() {
            return new CustomTableRenderer((Table) modelElement, rect);
        }

        @Override
        public LayoutResult layout(LayoutContext layoutContext) {
            return super.layout(new LayoutContext(new LayoutArea(layoutContext.getArea().getPageNumber(), rect)));
        }
    }
}

CenterVertically C#

using System.IO;
using iText.Kernel.Geom;
using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Layout;
using iText.Layout.Properties;
using iText.Layout.Renderer;

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

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

        protected void ManipulatePdf(string dest)
        {
            PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
            Document doc = new Document(pdfDoc);
            
            Cell cell = new Cell();
            for (int i = 1; i <= 5; i++)
            {
                cell.Add(new Paragraph("Line " + i));
            }

            Table table = new Table(UnitValue.CreatePercentArray(1)).UseAllAvailableWidth();
            table.AddCell(cell);
            table.AddCell(cell.Clone(true));
            table.AddCell(cell.Clone(true));
            table.SetNextRenderer(new CustomTableRenderer(table, ResolveTableRect(doc, table)));
            doc.Add(table);
            doc.Add(new AreaBreak());

            table = new Table(UnitValue.CreatePercentArray(1)).UseAllAvailableWidth();
            table.AddCell(cell.Clone(true));
            table.AddCell(cell.Clone(true));
            table.AddCell(cell.Clone(true));
            table.AddCell(cell.Clone(true));
            table.AddCell(cell.Clone(true));
            table.AddCell(cell.Clone(true));
            table.AddCell(cell.Clone(true));
            table.AddCell(cell.Clone(true));
            table.AddCell(cell.Clone(true));
            table.AddCell(cell.Clone(true));
            table.SetNextRenderer(new CustomTableRenderer(table, ResolveTableRect(doc, table)));
            doc.Add(table);

            doc.Close();
        }

        private static Rectangle ResolveTableRect(Document doc, Table table)
        {
            Rectangle pageDimension = new Rectangle(36, 36, 523, 770);
            IRenderer tableRenderer = table.CreateRendererSubTree().SetParent(doc.GetRenderer());
            LayoutResult tableLayoutResult = tableRenderer.Layout(new LayoutContext(new LayoutArea(0, pageDimension)));

            Rectangle resultRect;
            if (LayoutResult.PARTIAL == tableLayoutResult.GetStatus())
            {
                resultRect = pageDimension;
            }
            else
            {
                Rectangle tableBBox = tableLayoutResult.GetOccupiedArea().GetBBox();
                resultRect = new Rectangle(pageDimension.GetX(), ((tableBBox.GetBottom() + pageDimension.GetX()) / 2),
                    pageDimension.GetWidth(), tableBBox.GetHeight());
            }

            return resultRect;
        }

        protected class CustomTableRenderer : TableRenderer
        {
            protected Rectangle rect;

            public CustomTableRenderer(Table modelElement, Rectangle rect) : base(modelElement)
            {
                this.rect = new Rectangle(rect);
            }

            // If renderer overflows on the next area, iText uses getNextRender() method to create a renderer for the overflow part.
            // If getNextRenderer isn't overridden, the default method will be used and thus a default rather than custom
            // renderer will be created
            public override IRenderer GetNextRenderer()
            {
                return new CustomTableRenderer((Table) modelElement, rect);
            }

            public override LayoutResult Layout(LayoutContext layoutContext)
            {
                return base.Layout(new LayoutContext(new LayoutArea(layoutContext.GetArea().GetPageNumber(), rect)));
            }
        }
    }
}