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jfreechart example source code file (HeatMapDataset.java)

This example jfreechart source code file (HeatMapDataset.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

heatmapdataset, heatmapdataset, number, number

The jfreechart HeatMapDataset.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2009, 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.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * -------------------
 * HeatMapDataset.java
 * -------------------
 * (C) Copyright 2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 28-Jan-2009 : Version 1 (DG);
 *
 */

package org.jfree.data.general;

/**
 * A dataset that represents a rectangular grid of (x, y, z) values.  The x
 * and y values appear at regular intervals in the dataset, while the z-values
 * can take any value (including <code>null for unknown values).
 *
 * @since 1.0.13
 */
public interface HeatMapDataset {

    /**
     * Returns the number of x values across the width of the dataset.  The
     * values are evenly spaced between {@link #getMinimumXValue()} and
     * {@link #getMaximumXValue()}.
     * 
     * @return The number of x-values (always > 0).
     */
    public int getXSampleCount();

    /**
     * Returns the number of y values (or samples) for the dataset.  The
     * values are evenly spaced between {@link #getMinimumYValue()} and
     * {@link #getMaximumYValue()}.
     *
     * @return The number of y-values (always > 0).
     */
    public int getYSampleCount();

    /**
     * Returns the lowest x-value represented in this dataset.  A requirement
     * of this interface is that this method must never return infinite or
     * Double.NAN values.
     *
     * @return The lowest x-value represented in this dataset.
     */
    public double getMinimumXValue();

    /**
     * Returns the highest x-value represented in this dataset.  A requirement
     * of this interface is that this method must never return infinite or
     * Double.NAN values.
     *
     * @return The highest x-value represented in this dataset.
     */
    public double getMaximumXValue();

    /**
     * Returns the lowest y-value represented in this dataset.  A requirement
     * of this interface is that this method must never return infinite or
     * Double.NAN values.
     *
     * @return The lowest y-value represented in this dataset.
     */
    public double getMinimumYValue();

    /**
     * Returns the highest y-value represented in this dataset.  A requirement
     * of this interface is that this method must never return infinite or
     * Double.NAN values.
     *
     * @return The highest y-value represented in this dataset.
     */
    public double getMaximumYValue();

    /**
     * A convenience method that returns the x-value for the given index.
     * 
     * @param xIndex  the xIndex.
     * 
     * @return The x-value.
     */
    public double getXValue(int xIndex);

    /**
     * A convenience method that returns the y-value for the given index.
     * 
     * @param yIndex  the yIndex.
     * 
     * @return The y-value.
     */
    public double getYValue(int yIndex);

    /**
     * Returns the z-value at the specified sample position in the dataset.
     * For a missing or unknown value, this method should return Double.NAN.
     *
     * @param xIndex  the position of the x sample in the dataset.
     * @param yIndex  the position of the y sample in the dataset.
     *
     * @return The z-value.
     */
    public double getZValue(int xIndex, int yIndex);

    /**
     * Returns the z-value at the specified sample position in the dataset.
     * This method can return <code>null to indicate a missing/unknown
     * value.
     * <br>
* Bear in mind that the class implementing this interface may * store its data using primitives rather than objects, so calling this * method may require a new <code>Number object to be allocated... * for this reason, it is generally preferable to use the * {@link #getZValue(int, int)} method unless you *know* that the dataset * implementation stores the z-values using objects. * * @param xIndex the position of the x sample in the dataset. * @param yIndex the position of the y sample in the dataset. * * @return The z-value (possibly <code>null). */ public Number getZ(int xIndex, int yIndex); }

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