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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.
/* ===========================================================
* 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.]
*
* -----------
* Values.java
* -----------
* (C) Copyright 2001-2008, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes:
* --------
* 08-Nov-2001 : Version 1 (DG);
* 23-Oct-2002 : Renamed getValueCount --> getItemCount (DG);#
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 02-May-2006 : Updated API docs (DG);
*
*/
package org.jfree.data;
/**
* An interface through which (single-dimension) data values can be accessed.
*/
public interface Values {
/**
* Returns the number of items (values) in the collection.
*
* @return The item count (possibly zero).
*/
public int getItemCount();
/**
* Returns the value with the specified index.
*
* @param index the item index (in the range 0 to
* getItemCount() - 1).
*
* @return The value (possibly null).
*
* @throws IndexOutOfBoundsException if index is not in the
* specified range.
*/
public Number getValue(int index);
}