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JMusic - Java Music Library
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/*


Copyright (C) 2000 Andrew Sorensen & Andrew Brown

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 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.
*/

package jm.music.data;

import java.io.Serializable;

/**
 * @author Adam Kirby
 * @version $Revision: 1.1.1.1 $, $Date: 2009/05/30 07:56:42 $
 */

public abstract class Alignment implements Serializable {
    public static final Alignment START_TOGETHER =
            new Alignment() {
                public double determineStartTime(
                        final double length,
                        final double anchorST,
                        final double anchorET) {
                    return anchorST;
                }
            };

    public static final Alignment END_TOGETHER =
            new Alignment() {
                public double determineStartTime(
                        final double length,
                        final double anchorST,
                        final double anchorET) {
                    return anchorET - length;
                }
            };

    public static final Alignment AFTER =
            new Alignment() {
                public double determineStartTime(
                        final double length,
                        final double anchorST,
                        final double anchorET) {
                    return anchorET;
                }
            };

    public static final Alignment BEFORE =
            new Alignment() {
                public double determineStartTime(
                        final double length,
                        final double anchorST,
                        final double anchorET) {
                    return anchorST - length;
                }
            };

    public static final Alignment CENTRE_ALIGN =
            new Alignment() {
                public double determineStartTime(
                        final double length,
                        final double anchorST,
                        final double anchorET) {
                    return (anchorET + anchorST
                            - length) / 2;
                }
            };

    public static final Alignment CENTER_ALIGN = CENTRE_ALIGN;

    public static final Alignment START_ON_CENTRE =
            new Alignment() {
                public double determineStartTime(
                        final double length,
                        final double anchorST,
                        final double anchorET) {
                    return (anchorST + anchorET)
                            / 2;
                }
            };

    public static final Alignment START_ON_CENTER = START_ON_CENTRE;

    public static final Alignment END_ON_CENTRE =
            new Alignment() {
                public double determineStartTime(
                        final double length,
                        final double anchorST,
                        final double anchorET) {
                    return (anchorST + anchorET) / 2
                            - length;
                }
            };

    public static final Alignment END_ON_CENTER = END_ON_CENTRE;

    public static final Alignment CENTRE_ON_START =
            new Alignment() {
                public double determineStartTime(
                        final double length,
                        final double anchorST,
                        final double anchorET) {
                    return anchorST - (length / 2);
                }
            };

    public static final Alignment CENTER_ON_START = CENTRE_ON_START;

    public static final Alignment CENTRE_ON_END =
            new Alignment() {
                public double determineStartTime(
                        final double length,
                        final double anchorST,
                        final double anchorET) {
                    return anchorET - (length / 2);
                }
            };

    public static final Alignment CENTER_ON_END = CENTRE_ON_END;

    protected Alignment() {
    }

    abstract double determineStartTime(final double length,
                                       final double anchorStartTime,
                                       final double anchorEndTime);
}