net.sourceforge.plantuml.svek.image.Circle Maven / Gradle / Ivy
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PlantUML is a component that allows to quickly write :
* sequence diagram,
* use case diagram,
* class diagram,
* activity diagram,
* component diagram,
* state diagram
* object diagram
/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* (C) Copyright 2009-2013, Arnaud Roques
*
* Project Info: http://plantuml.sourceforge.net
*
* This file is part of PlantUML.
*
* PlantUML is free software; you can redistribute it and/or modify it
* under the terms of the GNU 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 General Public
* License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* Original Author: Arnaud Roques
*
* Revision $Revision: 5183 $
*
*/
package net.sourceforge.plantuml.svek.image;
import java.awt.geom.Point2D;
public class Circle {
private Point2D center;
private double radius;
public Circle() {
this(new Point2D.Double());
}
public Circle(Point2D center) {
this.center = center;
this.radius = 0;
}
public Circle(Point2D p1, Point2D p2) {
center = new Point2D.Double((p1.getX() + p2.getX()) / 2, (p1.getY() + p2.getY()) / 2);
radius = p1.distance(center);
}
public static Circle getCircle(Point2D p1, Point2D p2, Point2D p3) {
if (p3.getY() != p2.getY()) {
return new Circle(p1, p2, p3);
}
return new Circle(p2, p1, p3);
}
private Circle(Point2D p1, Point2D p2, Point2D 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 Point2D.Double(x, y);
radius = center.distance(p1);
}
public Point2D getCenter() {
return center;
}
public double getRadius() {
return radius;
}
public boolean isOutside(Point2D point) {
final double d = center.distance(point);
if (d > radius) {
return true;
}
return false;
}
}