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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.wbs;

import net.sourceforge.plantuml.klimt.UTranslate;
import net.sourceforge.plantuml.klimt.color.HColor;
import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.geom.XDimension2D;
import net.sourceforge.plantuml.klimt.geom.XLine2D;
import net.sourceforge.plantuml.klimt.geom.XPoint2D;
import net.sourceforge.plantuml.klimt.geom.XRectangle2D;
import net.sourceforge.plantuml.klimt.shape.UDrawable;
import net.sourceforge.plantuml.svek.extremity.ExtremityArrow;

class WBSLink implements UDrawable {

	private final WElement element1;
	private final WElement element2;
	private final HColor color;

	public WBSLink(WElement element1, WElement element2, HColor color) {
		this.element1 = element1;
		this.element2 = element2;
		this.color = color;
		if (color == null)
			throw new IllegalArgumentException();
	}

	public final WElement getElement1() {
		return element1;
	}

	public final WElement getElement2() {
		return element2;
	}

	public void drawU(UGraphic ug) {
		final WElement element1 = getElement1();
		final WElement element2 = getElement2();
		final UTranslate position1 = element1.getPosition();
		final UTranslate position2 = element2.getPosition();
		final XDimension2D dim1 = element1.getDimension();
		final XDimension2D dim2 = element2.getDimension();
		if (position1 != null && position2 != null) {

			final XRectangle2D rect1 = new XRectangle2D(position1.getDx(), position1.getDy(), dim1.getWidth(),
					dim1.getHeight());
			final XRectangle2D rect2 = new XRectangle2D(position2.getDx(), position2.getDy(), dim2.getWidth(),
					dim2.getHeight());

			XLine2D line = new XLine2D(rect1.getCenterX(), rect1.getCenterY(), rect2.getCenterX(), rect2.getCenterY());

			final XPoint2D c1 = rect1.intersect(line);
			final XPoint2D c2 = rect2.intersect(line);

			line = XLine2D.line(c1, c2);
			ug = ug.apply(color);
			line.drawU(ug);

			final double angle = line.getAngle();
			final ExtremityArrow arrow = new ExtremityArrow(c2, angle);
			arrow.drawU(ug);

		}

	}

}