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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.image;

import net.sourceforge.plantuml.klimt.geom.XPoint2D;

public class Circle {

	private XPoint2D center;

	private double radius;

	public Circle() {
		this(new XPoint2D(0, 0));
	}

	public Circle(XPoint2D center) {
		this.center = center;
		this.radius = 0;
	}

	public Circle(XPoint2D p1, XPoint2D p2) {
		center = new XPoint2D((p1.getX() + p2.getX()) / 2, (p1.getY() + p2.getY()) / 2);
		radius = p1.distance(center);
	}

	public static Circle getCircle(XPoint2D p1, XPoint2D p2, XPoint2D p3) {
		if (p3.getY() != p2.getY()) {
			return new Circle(p1, p2, p3);
		}
		return new Circle(p2, p1, p3);
	}

	private Circle(XPoint2D p1, XPoint2D p2, XPoint2D p3) {
		final double num1 = p3.getX() * p3.getX() * (p1.getY() - p2.getY())
				+ (p1.getX() * p1.getX() + (p1.getY() - p2.getY()) * (p1.getY() - p3.getY())) * (p2.getY() - p3.getY())
				+ p2.getX() * p2.getX() * (-p1.getY() + p3.getY());
		final double den1 = 2 * (p3.getX() * (p1.getY() - p2.getY()) + p1.getX() * (p2.getY() - p3.getY())
				+ p2.getX() * (-p1.getY() + p3.getY()));
		final double x = num1 / den1;
		final double den2 = p3.getY() - p2.getY();
		final double y = (p2.getY() + p3.getY()) / 2
				- (p3.getX() - p2.getX()) / den2 * (x - (p2.getX() + p3.getX()) / 2);
		center = new XPoint2D(x, y);
		radius = center.distance(p1);
	}

	public XPoint2D getCenter() {
		return center;
	}

	public double getRadius() {
		return radius;
	}

	public boolean isOutside(XPoint2D point) {
		final double d = center.distance(point);
		if (d > radius) {
			return true;
		}
		return false;
	}

}