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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.
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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2013, by Object Refinery Limited 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.]
 *
 * -------------
 * Timeline.java
 * -------------
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  Bill Kelemen;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 23-May-2003 : Version 1 (BK);
 * 09-Sep-2003 : Changed some method and parameter names (DG);
 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
 *
 */

package org.jfree.chart.axis;

import java.util.Date;

/**
 * An interface that defines the contract for a Timeline.
 * 
 * A Timeline will present a series of values to be used for an axis. Each
 * Timeline must provide transformation methods between domain values and
 * timeline values. In theory many transformations are possible. This interface
 * has been implemented completely in
 * {@link org.jfree.chart.axis.SegmentedTimeline}.
 * 

 * A timeline can be used as parameter to a
 * {@link org.jfree.chart.axis.DateAxis} to define the values that this axis
 * supports. As an example, the {@link org.jfree.chart.axis.SegmentedTimeline}
 * implements a timeline formed by segments of equal length (ex. days, hours,
 * minutes) where some segments can be included in the timeline and others
 * excluded. Therefore timelines like "working days" or "working hours" can be
 * created where non-working days or non-working hours respectively can be
 * removed from the timeline, and therefore from the axis. This creates a smooth
 * plot with equal separation between all included segments.
 * 
 * Because Timelines were created mainly for Date related axis, values are
 * represented as longs instead of doubles. In this case, the domain value is
 * just the number of milliseconds since January 1, 1970, 00:00:00 GMT as
 * defined by the getTime() method of {@link java.util.Date}.
 *
 * @see org.jfree.chart.axis.SegmentedTimeline
 * @see org.jfree.chart.axis.DateAxis
 */
public interface Timeline {

    /**
     * Translates a millisecond (as defined by java.util.Date) into an index
     * along this timeline.
     *
     * @param millisecond  the millisecond.
     *
     * @return A timeline value.
     */
    long toTimelineValue(long millisecond);

    /**
     * Translates a date into a value on this timeline.
     *
     * @param date  the date.
     *
     * @return A timeline value
     */
    long toTimelineValue(Date date);

    /**
     * Translates a value relative to this timeline into a domain value. The
     * domain value obtained by this method is not always the same domain value
     * that could have been supplied to
     * translateDomainValueToTimelineValue(domainValue).
     * This is because the original transformation may not be complete
     * reversable.
     *
     * @see org.jfree.chart.axis.SegmentedTimeline
     *
     * @param timelineValue  a timeline value.
     *
     * @return A domain value.
     */
    long toMillisecond(long timelineValue);

    /**
     * Returns true if a value is contained in the timeline values.
     *
     * @param millisecond  the millisecond.
     *
     * @return true if value is contained in the timeline and
     *         false otherwise.
     */
    boolean containsDomainValue(long millisecond);

    /**
     * Returns true if a date is contained in the timeline values.
     *
     * @param date  the date to verify.
     *
     * @return true if value is contained in the timeline and
     *         false  otherwise.
     */
    boolean containsDomainValue(Date date);

    /**
     * Returns true if a range of values are contained in the
     * timeline.
     *
     * @param fromMillisecond  the start of the range to verify.
     * @param toMillisecond  the end of the range to verify.
     *
     * @return true if the range is contained in the timeline or
     *         false otherwise
     */
    boolean containsDomainRange(long fromMillisecond, long toMillisecond);

    /**
     * Returns true if a range of dates are contained in the
     * timeline.
     *
     * @param fromDate  the start of the range to verify.
     * @param toDate  the end of the range to verify.
     *
     * @return true if the range is contained in the timeline or
     *         false otherwise
     */
    boolean containsDomainRange(Date fromDate, Date toDate);

}