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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.
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/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 * 
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser 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.]
 * 
 * ----------
 * Align.java
 * ----------
 * (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.
 *
 * Original Author:  Christian W. Zuckschwerdt;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: Align.java,v 1.5 2005/10/18 13:18:34 mungady Exp $
 *
 * Changes (from 30-May-2002)
 * --------------------------
 * 30-May-2002 : Added title (DG);
 * 13-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 *
 */

package org.jfree.ui;

import java.awt.geom.Rectangle2D;

/**
 * A utility class for aligning rectangles.
 *
 * @author David Gilbert
 */
public final class Align {

    /** Center alignment. */
    public static final int CENTER = 0x00;

    /** Top alignment. */
    public static final int TOP = 0x01;

    /** Bottom alignment. */
    public static final int BOTTOM = 0x02;

    /** Left alignment. */
    public static final int LEFT = 0x04;

    /** Right alignment. */
    public static final int RIGHT = 0x08;

    /** Top/Left alignment. */
    public static final int TOP_LEFT = TOP | LEFT;

    /** Top/Right alignment. */
    public static final int TOP_RIGHT = TOP | RIGHT;

    /** Bottom/Left alignment. */
    public static final int BOTTOM_LEFT = BOTTOM | LEFT;

    /** Bottom/Right alignment. */
    public static final int BOTTOM_RIGHT = BOTTOM | RIGHT;

    /** Horizontal fit. */
    public static final int FIT_HORIZONTAL = LEFT | RIGHT;

    /** Vertical fit. */
    public static final int FIT_VERTICAL = TOP | BOTTOM;

    /** Complete fit. */
    public static final int FIT = FIT_HORIZONTAL | FIT_VERTICAL;

    /** North alignment (same as TOP). */
    public static final int NORTH = TOP;

    /** South alignment (same as BOTTOM). */
    public static final int SOUTH = BOTTOM;

    /** West alignment (same as LEFT). */
    public static final int WEST = LEFT;

    /** East alignment (same as RIGHT). */
    public static final int EAST = RIGHT;

    /** North/West alignment (same as TOP_LEFT). */
    public static final int NORTH_WEST = NORTH | WEST;

    /** North/East alignment (same as TOP_RIGHT). */
    public static final int NORTH_EAST = NORTH | EAST;

    /** South/West alignment (same as BOTTOM_LEFT). */
    public static final int SOUTH_WEST = SOUTH | WEST;

    /** South/East alignment (same as BOTTOM_RIGHT). */
    public static final int SOUTH_EAST = SOUTH | EAST;

    /**
     * Private constructor.
     */
    private Align() { 
        super();
    }
    
    /**
     * Aligns one rectangle (rect) relative to another rectangle (frame).
     *
     * @param rect  the rectangle to be aligned (null not permitted).
     * @param frame  the reference frame (null not permitted).
     * @param align  the alignment code.
     */
    public static void align(final Rectangle2D rect, final Rectangle2D frame, final int align) {

        double x = frame.getCenterX() - rect.getWidth() / 2.0;
        double y = frame.getCenterY() - rect.getHeight() / 2.0;
        double w = rect.getWidth();
        double h = rect.getHeight();

        if ((align & FIT_VERTICAL) == FIT_VERTICAL) {
            h = frame.getHeight();
        }

        if ((align & FIT_HORIZONTAL) == FIT_HORIZONTAL) {
            w = frame.getWidth();
        }

        if ((align & TOP) == TOP) {
            y = frame.getMinY();
        }

        if ((align & BOTTOM) == BOTTOM) {
            y = frame.getMaxY() - h;
        }

        if ((align & LEFT) == LEFT) {
            x = frame.getX();
        }

        if ((align & RIGHT) == RIGHT) {
            x = frame.getMaxX() - w;
        }

        rect.setRect(x, y, w, h);

    }

}