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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
package net.sourceforge.plantuml;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import net.atmp.PixelImage;
import net.sourceforge.plantuml.core.Diagram;
import net.sourceforge.plantuml.klimt.AffineTransformType;
import net.sourceforge.plantuml.klimt.UShape;
import net.sourceforge.plantuml.klimt.creole.Neutron;
import net.sourceforge.plantuml.klimt.creole.atom.Atom;
import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.font.StringBounder;
import net.sourceforge.plantuml.klimt.geom.HorizontalAlignment;
import net.sourceforge.plantuml.klimt.geom.XDimension2D;
import net.sourceforge.plantuml.klimt.shape.AbstractTextBlock;
import net.sourceforge.plantuml.klimt.shape.Line;
import net.sourceforge.plantuml.klimt.shape.UImage;
import net.sourceforge.plantuml.klimt.shape.UImageSvg;
import net.sourceforge.plantuml.log.Logme;
import net.sourceforge.plantuml.preproc.Defines;
import net.sourceforge.plantuml.security.SImageIO;
import net.sourceforge.plantuml.style.ISkinSimple;
import net.sourceforge.plantuml.text.StringLocated;

public class EmbeddedDiagram extends AbstractTextBlock implements Line, Atom {
	// ::remove file when __HAXE__

	public static final String EMBEDDED_START = "{{";
	public static final String EMBEDDED_END = "}}";

	public static String getEmbeddedType(CharSequence cs) {
		if (cs == null)
			return null;

		final String s = StringUtils.trin(cs.toString());
		if (s.startsWith(EMBEDDED_START) == false)
			return null;

		if (s.equals(EMBEDDED_START))
			return "uml";

		if (s.equals(EMBEDDED_START + "ditaa"))
			return "ditaa";

		if (s.equals(EMBEDDED_START + "uml"))
			return "uml";

		if (s.equals(EMBEDDED_START + "wbs"))
			return "wbs";

		if (s.equals(EMBEDDED_START + "mindmap"))
			return "mindmap";

		if (s.equals(EMBEDDED_START + "gantt"))
			return "gantt";

		if (s.equals(EMBEDDED_START + "json"))
			return "json";

		if (s.equals(EMBEDDED_START + "yaml"))
			return "yaml";

		if (s.equals(EMBEDDED_START + "wire"))
			return "wire";

		if (s.equals(EMBEDDED_START + "creole"))
			return "creole";

		if (s.equals(EMBEDDED_START + "board"))
			return "board";

		if (s.equals(EMBEDDED_START + "ebnf"))
			return "ebnf";

		if (s.equals(EMBEDDED_START + "regex"))
			return "regex";

		if (s.equals(EMBEDDED_START + "files"))
			return "files";

		return null;
	}

	public static EmbeddedDiagram createAndSkip(String type, Iterator it, ISkinSimple skinParam) {
		final List result = new ArrayList();
		result.add("@start" + type);
		int nested = 1;
		while (it.hasNext()) {
			final CharSequence s2 = it.next();
			if (EmbeddedDiagram.getEmbeddedType(StringUtils.trinNoTrace(s2)) != null)
				// if (StringUtils.trinNoTrace(s2).startsWith(EmbeddedDiagram.EMBEDDED_START))
				nested++;
			else if (StringUtils.trinNoTrace(s2).equals(EmbeddedDiagram.EMBEDDED_END)) {
				nested--;
				if (nested == 0)
					break;
			}
			result.add(s2.toString());
		}
		result.add("@end" + type);
		return EmbeddedDiagram.from(skinParam, result);

	}

	private final List list;
	private final ISkinSimple skinParam;
	private BufferedImage image;

	private EmbeddedDiagram(ISkinSimple skinParam, List system) {
		this.list = system;
		this.skinParam = skinParam;
	}

	public static EmbeddedDiagram from(ISkinSimple skinParam, List strings) {
		return new EmbeddedDiagram(skinParam, BlockUml.convert(strings));
	}

	public double getStartingAltitude(StringBounder stringBounder) {
		return 0;
	}

	public XDimension2D calculateDimension(StringBounder stringBounder) {
		try {
			if (stringBounder.matchesProperty("SVG")) {
				final String imageSvg = getImageSvg();
				final UImageSvg svg = new UImageSvg(imageSvg, 1);
				return new XDimension2D(svg.getWidth(), svg.getHeight());
			}
			final BufferedImage im = getImage();
			return new XDimension2D(im.getWidth(), im.getHeight());
		} catch (IOException e) {
			Logme.error(e);
		} catch (InterruptedException e) {
			Logme.error(e);
		}
		return new XDimension2D(42, 42);
	}

	public void drawU(UGraphic ug) {
		try {
			final boolean isSvg = ug.matchesProperty("SVG");
			if (isSvg) {
				final String imageSvg = getImageSvg();
				final UImageSvg svg = new UImageSvg(imageSvg, 1);
				ug.draw(svg);
				return;
			}
			final BufferedImage im = getImage();
			final UShape image = new UImage(new PixelImage(im, AffineTransformType.TYPE_BILINEAR));
			ug.draw(image);
		} catch (IOException e) {
			Logme.error(e);
		} catch (InterruptedException e) {
			Logme.error(e);
		}

	}

	private String getImageSvg() throws IOException, InterruptedException {
		final Diagram system = getSystem();
		final ByteArrayOutputStream os = new ByteArrayOutputStream();
		system.exportDiagram(os, 0, new FileFormatOption(FileFormat.SVG));
		os.close();
		return new String(os.toByteArray());
	}

	private BufferedImage getImage() throws IOException, InterruptedException {
		if (image == null)
			image = getImageSlow();

		return image;
	}

	private BufferedImage getImageSlow() throws IOException, InterruptedException {
		final Diagram system = getSystem();
		final ByteArrayOutputStream os = new ByteArrayOutputStream();
		system.exportDiagram(os, 0, new FileFormatOption(FileFormat.PNG));
		os.close();
		return SImageIO.read(os.toByteArray());
	}

	public HorizontalAlignment getHorizontalAlignment() {
		return HorizontalAlignment.LEFT;
	}

	private Diagram getSystem() throws IOException, InterruptedException {
		final BlockUml blockUml = new BlockUml(list, Defines.createEmpty(), skinParam, null, null);
		return blockUml.getDiagram();

	}

	@Override
	public List getNeutrons() {
		return Arrays.asList(Neutron.create(this));
	}

}