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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 General Public License V2.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * 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 GPL v2 license.
 *
 * The generated images can then be used without any reference to the GPL v2 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.svek;

import java.awt.geom.AffineTransform;

import net.sourceforge.plantuml.klimt.UShape;
import net.sourceforge.plantuml.klimt.UTranslate;
import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.geom.XPoint2D;
import net.sourceforge.plantuml.klimt.shape.UDrawable;
import net.sourceforge.plantuml.klimt.shape.UEllipse;

class CircleAndArrow implements UDrawable {

	private final AffineTransform at;
	private final AffineTransform at2;
	private int radius;
	private final XPoint2D center;
	private final XPoint2D p1;
	private final XPoint2D p2;
	private XPoint2D p3;
	private XPoint2D p4;

	public CircleAndArrow(XPoint2D p1, XPoint2D p2) {
		this.center = new XPoint2D((p1.getX() + p2.getX()) / 2, (p1.getY() + p2.getY()) / 2);
		at = AffineTransform.getTranslateInstance(-center.getX(), -center.getY());
		at2 = AffineTransform.getTranslateInstance(center.getX(), center.getY());
		radius = (int) (p1.distance(p2) / 2);
		if (radius % 2 == 0) {
			radius--;
		}
		this.p1 = putOnCircle(p1);
		this.p2 = putOnCircle(p2);

		this.p3 = this.p1.transform(at);
		this.p3 = new XPoint2D(p3.getY(), -p3.getX());
		this.p3 = this.p3.transform(at2);

		this.p4 = this.p2.transform(at);
		this.p4 = new XPoint2D(p4.getY(), -p4.getX());
		this.p4 = this.p4.transform(at2);
	}

	private XPoint2D putOnCircle(XPoint2D p) {
		p = p.transform(at);
		final double coef = p.distance(new XPoint2D(0, 0)) / radius;
		p = new XPoint2D(p.getX() / coef, p.getY() / coef);
		return p.transform(at2);
	}

	public void drawU(UGraphic ug) {
		final UShape circle = UEllipse.build(radius * 2, radius * 2);
		ug.apply(new UTranslate(center.getX() - radius, center.getY() - radius)).draw(circle);
		// drawLine(ug, x, y, p1, p2);
		// drawLine(ug, x, y, p3, p4);
	}

}