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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.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
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 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see .
 *
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 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
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 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this LGPL license.
 *
 * The generated images can then be used without any reference to the LGPL license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
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 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
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 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
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 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
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 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
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 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.sequencediagram.graphic;

import java.util.ArrayList;
import java.util.List;

import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.font.StringBounder;
import net.sourceforge.plantuml.sequencediagram.InGroupable;
import net.sourceforge.plantuml.skin.Context2D;

final class NotesBoxes extends GraphicalElement implements InGroupable {

	private final List notes = new ArrayList<>();
	private final List participants1 = new ArrayList<>();
	private final List participants2 = new ArrayList<>();

	NotesBoxes(double startingY) {
		super(startingY);
	}

	public void add(NoteBox noteBox, ParticipantBox participantBox1, ParticipantBox participantBox2) {
		notes.add(noteBox);
		participants1.add(participantBox1);
		if (participantBox2 == null)
			participants2.add(participantBox1);
		else
			participants2.add(participantBox2);

	}

	public void ensureConstraints(StringBounder stringBounder, ConstraintSet constraintSet) {
		for (int i = 0; i < notes.size(); i++) {
			final NoteBox noteBox = notes.get(i);
			final ParticipantBox participantBox1 = participants1.get(i);
			final ParticipantBox participantBox2 = participants2.get(i);
			final double width = noteBox.getPreferredWidth(stringBounder);
			// System.err.println("i=" + i);
			// System.err.println("width=" + width);
			// System.err.println("participantBox1=" + participantBox1);
			// System.err.println("participantBox2=" + participantBox2);
			constraintSet.getConstraintBefore(participantBox1).ensureValue(width / 2);
			constraintSet.getConstraintAfter(participantBox2).ensureValue(width / 2);
			for (int j = i + 1; j < notes.size(); j++) {
				final NoteBox noteBox2 = notes.get(j);
				final ParticipantBox otherParticipantBox1 = participants1.get(j);
				final double width2 = noteBox2.getPreferredWidth(stringBounder);
				if (participantBox2 != otherParticipantBox1)
					constraintSet.getConstraint(participantBox2, otherParticipantBox1)
							.ensureValue((width + width2) / 2);
			}
		}
	}

	public double getMinX(StringBounder stringBounder) {
		double result = Double.MAX_VALUE;
		for (NoteBox n : notes) {
			final double m = n.getMinX(stringBounder);
			if (m < result)
				result = m;

		}
		return result;
	}

	public double getMaxX(StringBounder stringBounder) {
		double result = -Double.MAX_VALUE;
		for (NoteBox n : notes) {
			final double m = n.getMaxX(stringBounder);
			if (m > result)
				result = m;

		}
		return result;
	}

	public String toString(StringBounder stringBounder) {
		return toString();
	}

	@Override
	protected void drawInternalU(UGraphic ug, double maxX, Context2D context) {
		for (NoteBox n : notes)
			n.drawInternalU(ug, maxX, context);

	}

	@Override
	public double getStartingX(StringBounder stringBounder) {
		double result = Double.MAX_VALUE;
		for (NoteBox n : notes) {
			final double m = n.getStartingX(stringBounder);
			if (m < result)
				result = m;

		}
		return result;
	}

	@Override
	public double getPreferredWidth(StringBounder stringBounder) {
		final double result = getMaxX(stringBounder) - getMinX(stringBounder);
		return result;
	}

	@Override
	public double getPreferredHeight(StringBounder stringBounder) {
		double result = 0;
		for (NoteBox n : notes) {
			final double m = n.getPreferredHeight(stringBounder);
			if (m > result)
				result = m;

		}
		return result;
	}

}