Java Rectangle Rotate rotateRoundMiddlePoint(Rectangle2D rectangle)

Description

rotate Round Middle Point

License

Open Source License

Declaration

public static Rectangle2D rotateRoundMiddlePoint(Rectangle2D rectangle) 

Method Source Code

//package com.java2s;
/*/*from  w  w  w .  j  a va  2 s.  c om*/
 * photo-manager is a program to manage and organize your photos; Copyright (C) 2010 Dietrich Hentschel
 *
 * This program 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 2 of the License, or (at your option) any later version.
 *
 * This program is 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 program;
 * if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

import java.awt.geom.*;

public class Main {
    public static Rectangle2D rotateRoundMiddlePoint(Rectangle2D rectangle) {
        Rectangle2D rec = new Rectangle2D.Double();
        rec.setRect(rectangle); // Kopieren
        double x = (rec.getWidth() / 2);
        double y = (rec.getHeight() / 2);
        // auf Mittelpunkt "schrumpfen"
        rec = grow(rec, new Point2D.Double(-x, -y));
        // jetzt "wachsen"
        rec = grow(rec, new Point2D.Double(y, x));
        return rec;
    }

    public static Rectangle2D grow(Rectangle2D rec, Point2D grow) {

        double x = rec.getX();
        double y = rec.getY();
        double w = rec.getWidth();
        double h = rec.getHeight();

        x = x - grow.getX();
        y = y - grow.getY();
        w = w + grow.getX() * 2;
        h = h + grow.getY() * 2;

        return new Rectangle2D.Double(x, y, w, h);
    }
}

Related

1. rotateRectangleOnEllipse(Rectangle2D rect, Point2D center, double angle, double a, double b)