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jfreechart example source code file (DefaultHeatMapDataset.java)

This example jfreechart source code file (DefaultHeatMapDataset.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

clonenotsupportedexception, defaultheatmapdataset, defaultheatmapdataset, illegalargumentexception, illegalargumentexception, inf, inf, io, nan, nan, number, object, publiccloneable, requires, serializable

The jfreechart DefaultHeatMapDataset.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.]
 *
 * --------------------------
 * DefaultHeatMapDataset.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;

import java.io.Serializable;
import org.jfree.data.DataUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A default implementation of the {@link HeatMapDataset} interface.
 *
 * @since 1.0.13
 */
public class DefaultHeatMapDataset extends AbstractDataset
        implements HeatMapDataset, Cloneable, PublicCloneable, Serializable {

    /** The number of samples in this dataset for the x-dimension. */
    private int xSamples;

    /** The number of samples in this dataset for the y-dimension. */
    private int ySamples;

    /** The minimum x-value in the dataset. */
    private double minX;

    /** The maximum x-value in the dataset. */
    private double maxX;

    /** The minimum y-value in the dataset. */
    private double minY;

    /** The maximum y-value in the dataset. */
    private double maxY;

    /** Storage for the z-values. */
    private double[][] zValues;

    /**
     * Creates a new dataset where all the z-values are initially 0.  This is
     * a fixed size array of z-values.
     *
     * @param xSamples  the number of x-values.
     * @param ySamples  the number of y-values
     * @param minX  the minimum x-value in the dataset.
     * @param maxX  the maximum x-value in the dataset.
     * @param minY  the minimum y-value in the dataset.
     * @param maxY  the maximum y-value in the dataset.
     */
    public DefaultHeatMapDataset(int xSamples, int ySamples, double minX,
            double maxX, double minY, double maxY) {

        if (xSamples < 1) {
            throw new IllegalArgumentException("Requires 'xSamples' > 0");
        }
        if (ySamples < 1) {
            throw new IllegalArgumentException("Requires 'ySamples' > 0");
        }
        if (Double.isInfinite(minX) || Double.isNaN(minX)) {
            throw new IllegalArgumentException("'minX' cannot be INF or NaN.");
        }
        if (Double.isInfinite(maxX) || Double.isNaN(maxX)) {
            throw new IllegalArgumentException("'maxX' cannot be INF or NaN.");
        }
        if (Double.isInfinite(minY) || Double.isNaN(minY)) {
            throw new IllegalArgumentException("'minY' cannot be INF or NaN.");
        }
        if (Double.isInfinite(maxY) || Double.isNaN(maxY)) {
            throw new IllegalArgumentException("'maxY' cannot be INF or NaN.");
        }

        this.xSamples = xSamples;
        this.ySamples = ySamples;
        this.minX = minX;
        this.maxX = maxX;
        this.minY = minY;
        this.maxY = maxY;
        this.zValues = new double[xSamples][];
        for (int x = 0; x < xSamples; x++) {
            this.zValues[x] = new double[ySamples];
        }
    }

    /**
     * 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() {
        return this.xSamples;
    }

    /**
     * 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() {
        return this.ySamples;
    }

    /**
     * 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() {
        return this.minX;
    }

    /**
     * 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() {
        return this.maxX;
    }

    /**
     * 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() {
        return this.minY;
    }

    /**
     * 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() {
        return this.maxY;
    }

    /**
     * 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) {
        double x = this.minX
                + (this.maxX - this.minX) * (xIndex / (double) this.xSamples);
        return x;
    }

    /**
     * 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) {
        double y = this.minY
                + (this.maxY - this.minY) * (yIndex / (double) this.ySamples);
        return y;
    }

    /**
     * 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) {
        return this.zValues[xIndex][yIndex];
    }

    /**
     * Returns the z-value at the specified sample position in the dataset.
     * In this implementation, where the underlying values are stored in an
     * array of double primitives, you should avoid using this method and
     * use {@link #getZValue(int, int)} instead.
     *
     * @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 Number getZ(int xIndex, int yIndex) {
        return new Double(getZValue(xIndex, yIndex));
    }

    /**
     * Updates a z-value in the dataset and sends a {@link DatasetChangeEvent}
     * to all registered listeners.
     *
     * @param xIndex  the x-index.
     * @param yIndex  the y-index.
     * @param z  the new z-value.
     */
    public void setZValue(int xIndex, int yIndex, double z) {
        setZValue(xIndex, yIndex, z, true);
    }

    /**
     * Updates a z-value in the dataset and, if requested, sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     *
     * @param xIndex  the x-index.
     * @param yIndex  the y-index.
     * @param z  the new z-value.
     * @param notify  notify listeners?
     */
    public void setZValue(int xIndex, int yIndex, double z, boolean notify) {
        this.zValues[xIndex][yIndex] = z;
        if (notify) {
            fireDatasetChanged();
        }
    }

    /**
     * Tests this dataset for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof DefaultHeatMapDataset)) {
            return false;
        }
        DefaultHeatMapDataset that = (DefaultHeatMapDataset) obj;
        if (this.xSamples != that.xSamples) {
            return false;
        }
        if (this.ySamples != that.ySamples) {
            return false;
        }
        if (this.minX != that.minX) {
            return false;
        }
        if (this.maxX != that.maxX) {
            return false;
        }
        if (this.minY != that.minY) {
            return false;
        }
        if (this.maxY != that.maxY) {
            return false;
        }
        if (!DataUtilities.equal(this.zValues, that.zValues)) {
            return false;
        }
        // can't find any differences
        return true;
    }

    /**
     * Returns an independent copy of this dataset.
     *
     * @return A clone.
     *
     * @throws java.lang.CloneNotSupportedException
     */
    public Object clone() throws CloneNotSupportedException {
        DefaultHeatMapDataset clone = (DefaultHeatMapDataset) super.clone();
        clone.zValues = DataUtilities.clone(this.zValues);
        return clone;
    }

}

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