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98 lines
2.8 KiB
Java
98 lines
2.8 KiB
Java
/* ========================================================================
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* PlantUML : a free UML diagram generator
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* ========================================================================
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*
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* (C) Copyright 2009-2023, Arnaud Roques
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*
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* Project Info: http://plantuml.com
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*
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* If you like this project or if you find it useful, you can support us at:
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*
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* http://plantuml.com/patreon (only 1$ per month!)
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* http://plantuml.com/paypal
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*
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* This file is part of PlantUML.
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*
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* PlantUML is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* PlantUML distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*
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*
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* Original Author: Arnaud Roques
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*
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*
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*/
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package net.sourceforge.plantuml.svek.image;
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import java.awt.geom.Point2D;
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public class Circle {
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private Point2D center;
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private double radius;
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public Circle() {
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this(new Point2D.Double());
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}
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public Circle(Point2D center) {
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this.center = center;
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this.radius = 0;
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}
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public Circle(Point2D p1, Point2D p2) {
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center = new Point2D.Double((p1.getX() + p2.getX()) / 2, (p1.getY() + p2.getY()) / 2);
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radius = p1.distance(center);
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}
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public static Circle getCircle(Point2D p1, Point2D p2, Point2D p3) {
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if (p3.getY() != p2.getY()) {
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return new Circle(p1, p2, p3);
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}
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return new Circle(p2, p1, p3);
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}
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private Circle(Point2D p1, Point2D p2, Point2D p3) {
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final double num1 = p3.getX() * p3.getX() * (p1.getY() - p2.getY())
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+ (p1.getX() * p1.getX() + (p1.getY() - p2.getY()) * (p1.getY() - p3.getY())) * (p2.getY() - p3.getY())
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+ p2.getX() * p2.getX() * (-p1.getY() + p3.getY());
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final double den1 = 2 * (p3.getX() * (p1.getY() - p2.getY()) + p1.getX() * (p2.getY() - p3.getY())
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+ p2.getX() * (-p1.getY() + p3.getY()));
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final double x = num1 / den1;
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final double den2 = p3.getY() - p2.getY();
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final double y = (p2.getY() + p3.getY()) / 2
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- (p3.getX() - p2.getX()) / den2 * (x - (p2.getX() + p3.getX()) / 2);
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center = new Point2D.Double(x, y);
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radius = center.distance(p1);
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}
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public Point2D getCenter() {
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return center;
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}
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public double getRadius() {
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return radius;
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}
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public boolean isOutside(Point2D point) {
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final double d = center.distance(point);
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if (d > radius) {
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return true;
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}
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return false;
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}
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}
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