net.sourceforge.plantuml.posimo.LineRectIntersection 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

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/* ========================================================================
 * 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: 4236 $
 * 
 */
package net.sourceforge.plantuml.posimo;

import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

public class LineRectIntersection {

	private final Point2D inter;

	public LineRectIntersection(Line2D line, Rectangle2D rect) {
		final Point2D p1 = new Point2D.Double(rect.getMinX(), rect.getMinY());
		final Point2D p2 = new Point2D.Double(rect.getMaxX(), rect.getMinY());
		final Point2D p3 = new Point2D.Double(rect.getMaxX(), rect.getMaxY());
		final Point2D p4 = new Point2D.Double(rect.getMinX(), rect.getMaxY());

		final Point2D inter1 = new LineSegmentIntersection(new Line2D.Double(p1, p2), line).getIntersection();
		final Point2D inter2 = new LineSegmentIntersection(new Line2D.Double(p2, p3), line).getIntersection();
		final Point2D inter3 = new LineSegmentIntersection(new Line2D.Double(p3, p4), line).getIntersection();
		final Point2D inter4 = new LineSegmentIntersection(new Line2D.Double(p4, p1), line).getIntersection();

		final Point2D o = line.getP1();
		inter = getCloser(o, inter1, inter2, inter3, inter4);

	}

	public static Point2D getCloser(final Point2D o, final Point2D... other) {
		double minDist = Double.MAX_VALUE;
		Point2D result = null;

		for (Point2D pt : other) {
			if (pt != null) {
				final double dist = pt.distanceSq(o);
				if (dist < minDist) {
					minDist = dist;
					result = pt;
				}
			}
		}

		return result;
	}

	public final Point2D getIntersection() {
		return inter;
	}

}