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Orson Charts is a 3D chart library for the Java platform.
There is a newer version: 2.1.0
/* ===========================================================
 * Orson Charts : a 3D chart library for the Java(tm) platform
 * ===========================================================
 * 
 * (C)opyright 2013-2020, by Object Refinery Limited.  All rights reserved.
 * 
 * https://github.com/jfree/orson-charts
 * 
 * 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 3 of the License, or
 * (at your option) 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, see .
 * 
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 * 
 * If you do not wish to be bound by the terms of the GPL, an alternative
 * commercial license can be purchased.  For details, please see visit the
 * Orson Charts home page:
 * 
 * http://www.object-refinery.com/orsoncharts/index.html
 * 
 */

package org.jfree.chart3d.data;

/**
 * A generic representation of a three dimensional grid (cube) of data values.
 * We refer to the indices in the three dimensions as the 
 * {@code seriesIndex}, the {@code rowIndex} and the 
 * {@code columnIndex} (to match the downstream use of this data
 * structure to represent data values in a three dimensional plot).
 * 
 * @param  The value type (normally a numeric type).
 * 
 * @see KeyedValues3D
 */
public interface Values3D {

    /**
     * Returns the number of items in the x-dimension.
     * 
     * @return The number of items in the x-dimension. 
     */
    int getSeriesCount();
  
    /**
     * Returns the number of items in the y-dimension.
     * 
     * @return The number of items in the y-dimension. 
     */
    int getRowCount();
  
    /**
     * Returns the number of items in the z-dimension.
     * 
     * @return The number of items in the z-dimension. 
     */
    int getColumnCount();
  
    /**
     * Returns the data item at the specified position.
     * 
     * @param seriesIndex  the series-index.
     * @param rowIndex  the row-index.
     * @param columnIndex  the column-index.
     * 
     * @return The data value (possibly {@code null}).
     */
    T getValue(int seriesIndex, int rowIndex, int columnIndex);
   
    /**
     * Returns the data item at the specified position as a double primitive.
     * Where the {@link #getValue(int, int, int) } method returns 
     * {@code null}, this method returns {@code Double.NaN}.
     * 
     * @param seriesIndex  the series index.
     * @param rowIndex  the row index.
     * @param columnIndex  the column index.
     * 
     * @return The data value.
     */
    double getDoubleValue(int seriesIndex, int rowIndex, int columnIndex);
  
}