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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
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * 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 .
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * 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
 *
 * 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.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * 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
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.cucadiagram;

import net.sourceforge.plantuml.abel.Link;
import net.sourceforge.plantuml.klimt.UStroke;
import net.sourceforge.plantuml.klimt.UTranslate;
import net.sourceforge.plantuml.klimt.color.HColors;
import net.sourceforge.plantuml.klimt.creole.Display;
import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.font.FontConfiguration;
import net.sourceforge.plantuml.klimt.font.FontParam;
import net.sourceforge.plantuml.klimt.geom.HorizontalAlignment;
import net.sourceforge.plantuml.klimt.geom.XDimension2D;
import net.sourceforge.plantuml.klimt.geom.XPoint2D;
import net.sourceforge.plantuml.klimt.shape.TextBlock;
import net.sourceforge.plantuml.klimt.shape.ULine;
import net.sourceforge.plantuml.style.ISkinParam;

public class LinkConstraint {

	private final Link link1;
	private final Link link2;
	private final Display display;

	private double x1;
	private double y1;
	private double x2;
	private double y2;

	public LinkConstraint(Link link1, Link link2, Display display) {
		this.link1 = link1;
		this.link2 = link2;
		this.display = display;
	}

	public void setPosition(Link link, XPoint2D pt) {
		if (link == link1) {
			x1 = pt.getX();
			y1 = pt.getY();
		} else if (link == link2) {
			x2 = pt.getX();
			y2 = pt.getY();
		} else {
			throw new IllegalArgumentException();
		}
	}

	public void drawMe(UGraphic ug, ISkinParam skinParam) {
		if (x1 == 0 && y1 == 0) {
			return;
		}
		if (x2 == 0 && y2 == 0) {
			return;
		}
		ug = ug.apply(HColors.BLACK);
//		ug.apply(new UTranslate(x1, y1)).draw(URectangle.build(10, 10));
//		ug.apply(new UTranslate(x2, y2)).draw(URectangle.build(10, 10));

		final ULine line = new ULine(x2 - x1, y2 - y1);
		ug = ug.apply(new UStroke(3, 3, 1));
		ug.apply(new UTranslate(x1, y1)).draw(line);

		final TextBlock label = display.create(FontConfiguration.create(skinParam, FontParam.ARROW, null),
				HorizontalAlignment.CENTER, skinParam);
		final XDimension2D dimLabel = label.calculateDimension(ug.getStringBounder());
		final double x = (x1 + x2) / 2 - dimLabel.getWidth() / 2;
		final double y = (y1 + y2) / 2 - dimLabel.getHeight() / 2;
		label.drawU(ug.apply(new UTranslate(x, y)));

	}

}