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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D API, it supports a wide range of chart types including bar charts, pie charts, line charts, XY-plots, time series plots, Sankey charts and more.
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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-present, by David Gilbert and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/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.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 */

package org.jfree.chart.ui;

import java.awt.geom.Rectangle2D;

/**
 * A utility class for aligning rectangles.
 */
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 ({@code rect}) relative to another rectangle ({@code frame}).
     *
     * @param rect  the rectangle to be aligned ({@code null} not permitted).
     * @param frame  the reference frame ({@code null} not permitted).
     * @param align  the alignment code.
     */
    public static void align(Rectangle2D rect, Rectangle2D frame, 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);

    }

}