Example_05

Text kerning, rotated text, and drawing circles, arcs and ellipses.
Example_05.pdf — the PDF this example creates.
/*
 * Example_05.cs
 *
 * Copyright (c) 2026 PDFjet Software
 * Licensed under the MIT License. See LICENSE file in the project root.
 */
using System;
using System.IO;
using System.Diagnostics;
using PDFjet.NET;

/**
 * Example_05.cs
 *
 * Draws text at every angle around a point, and the words "WAVE AWAY" with and
 * without kerning, in the core font Helvetica-Bold, which is not embedded.
 *
 * A core font is one of the fourteen fonts every PDF viewer has, so the
 * document carries no font program: it is small, it is written fast, and the
 * kerning pairs and the widths of the font are built into the library, which
 * is what SetKernPairs shows. The disadvantages: the viewer draws the text with
 * its own version of the font, so the look differs a little between viewers;
 * only the WinAnsi characters can be drawn, so no Cyrillic, Greek or CJK text;
 * and a document with a font that is not embedded cannot claim PDF/A or PDF/UA
 * compliance. For those, use an embedded font like IBM Plex Sans, as the
 * other examples do.
 */
public class Example_05 {
    public Example_05() {
        PDF pdf = new PDF(new BufferedStream(
                new FileStream("Example_05.pdf", FileMode.Create)));

        Font f1 = new Font(pdf, CoreFont.HELVETICA_BOLD);
        f1.SetItalic(true);

        Page page = new Page(pdf, Letter.PORTRAIT);

        TextLine text = new TextLine(f1);
        text.SetLocation(300f, 300f);
        for (int i = 0; i < 360; i += 15) {
            text.SetTextRotation(-i);
            text.SetUnderline(true);
            // text.SetStrikeout(true);
            text.SetText("             Hello, World -- " + i + " degrees.");
            text.DrawOn(page);
        }

        text = new TextLine(f1, "WAVE AWAY");
        text.SetLocation(70f, 50f);
        text.DrawOn(page);

        f1.SetKernPairs(true);
        text = new TextLine(f1, "WAVE AWAY");
        text.SetLocation(70f, 70f);
        text.DrawOn(page);

        f1.SetKernPairs(false);
        text = new TextLine(f1, "WAVE AWAY");
        text.SetLocation(70f, 90f);
        text.DrawOn(page);

        f1.SetSize(8f);
        text = new TextLine(f1, "-- font.setKernPairs(false);");
        text.SetLocation(150f, 50f);
        text.DrawOn(page);
        text.SetLocation(150f, 90f);
        text.DrawOn(page);
        text = new TextLine(f1, "-- font.setKernPairs(true);");
        text.SetLocation(150f, 70f);
        text.DrawOn(page);

        Point point = new Point(300f, 300f);
        point.SetShape(Shape.CIRCLE);
        point.SetFillColor(Color.blue);
        point.SetRadius(37f);
        point.DrawOn(page);
        point.SetRadius(25f);
        point.SetFillColor(Color.white);
        point.DrawOn(page);

        float[] arcPoints = (new Arc())
            .SetLocation(300f, 600f)
            .SetRadiusX(75f)
            .SetRadiusY(75f)
            .SetStartAngle(0f)
            .SetSweep(270f)
            // .SetSweep(-270f)
            // .ScaleBy(2f)
            .SetStrokeWidth(5f)
            .SetStrokeColor(Color.blue)
            .DrawOn(page);

        (new Ellipse())
            .SetLocation(300f, 720f)
            .SetRadiusX(100f)
            .SetRadiusY(50f)
            .SetFillColor(Color.azure)
            .SetStrokeWidth(1.5f)
            .SetStrokeColor(Color.blue)
            .ScaleBy(0.5f)
            .SetRotation(45f)
            .DrawOn(page);

        pdf.Complete();
    }

    public static void Main(String[] args) {
        Stopwatch sw = Stopwatch.StartNew();
        long time0 = sw.ElapsedMilliseconds;
        new Example_05();
        long time1 = sw.ElapsedMilliseconds;
        Console.WriteLine($"Example_05 => {time1 - time0,4} ms");
    }
}   // End of Example_05.cs