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jfreechart example source code file (DefaultContourDataset.java)

This example jfreechart source code file (DefaultContourDataset.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

date, defaultcontourdataset, double, illegalargumentexception, illegalargumentexception, integer, number, number, object, object, only, only, range, util, vector

The jfreechart DefaultContourDataset.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.]
 *
 * --------------------------
 * DefaultContourDataset.java
 * --------------------------
 * (C) Copyright 2002-2008, by David M. O'Donnell and Contributors.
 *
 * Original Author:  David M. O'Donnell;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes (from 23-Jan-2003)
 * --------------------------
 * 23-Jan-2003 : Added standard header (DG);
 * 20-May-2003 : removed member vars numX and numY, which were never used (TM);
 * 06-May-2004 : Now extends AbstractXYZDataset (DG);
 * 15-Jul-2004 : Switched getX() with getXValue(), getY() with getYValue() and
 *               getZ() with getZValue() methods (DG);
 * ------------- JFREECHART 1.0.x --------------------------------------------
 * 31-Jan-2007 : Deprecated (DG);
 *
 */

package org.jfree.data.contour;

import java.util.Arrays;
import java.util.Date;
import java.util.Vector;

import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYBlockRenderer;
import org.jfree.data.Range;
import org.jfree.data.xy.AbstractXYZDataset;
import org.jfree.data.xy.XYDataset;

/**
 * A convenience class that provides a default implementation of the
 * {@link ContourDataset} interface.
 *
 * @deprecated This class is no longer supported (as of version 1.0.4).  If
 *     you are creating contour plots, please try to use {@link XYPlot} and
 *     {@link XYBlockRenderer}.
 */
public class DefaultContourDataset extends AbstractXYZDataset
                                   implements ContourDataset {

    /** The series name (this dataset supports only one series). */
    protected Comparable seriesKey = null;

    /** Storage for the x values. */
    protected Number[] xValues = null;

    /** Storage for the y values. */
    protected Number[] yValues = null;

    /** Storage for the z values. */
    protected Number[] zValues = null;

    /** The index for the start of each column in the data. */
    protected int[] xIndex = null;

    /** Flags that track whether x, y and z are dates. */
    boolean[] dateAxis = new boolean[3];

    /**
     * Creates a new dataset, initially empty.
     */
    public DefaultContourDataset() {
        super();
    }

    /**
     * Constructs a new dataset with the given data.
     *
     * @param seriesKey  the series key.
     * @param xData  the x values.
     * @param yData  the y values.
     * @param zData  the z values.
     */
    public DefaultContourDataset(Comparable seriesKey,
                                 Object[] xData,
                                 Object[] yData,
                                 Object[] zData) {

        this.seriesKey = seriesKey;
        initialize(xData, yData, zData);
    }

    /**
     * Initialises the dataset.
     *
     * @param xData  the x values.
     * @param yData  the y values.
     * @param zData  the z values.
     */
    public void initialize(Object[] xData,
                           Object[] yData,
                           Object[] zData) {

        this.xValues = new Double[xData.length];
        this.yValues = new Double[yData.length];
        this.zValues = new Double[zData.length];

        // We organise the data with the following assumption:
        // 1) the data are sorted by x then y
        // 2) that the data will be represented by a rectangle formed by
        //    using x[i+1], x, y[j+1], and y.
        // 3) we march along the y-axis at the same value of x until a new
        //    value x is found at which point we will flag the index
        //    where x[i+1]<>x[i]

        Vector tmpVector = new Vector(); //create a temporary vector
        double x = 1.123452e31; // set x to some arbitary value (used below)
        for (int k = 0; k < this.xValues.length; k++) {
            if (xData[k] != null) {
                Number xNumber;
                if (xData[k] instanceof Number) {
                    xNumber = (Number) xData[k];
                }
                else if (xData[k] instanceof Date) {
                    this.dateAxis[0] = true;
                    Date xDate = (Date) xData[k];
                    xNumber = new Long(xDate.getTime()); //store data as Long
                }
                else {
                    xNumber = new Integer(0);
                }
                this.xValues[k] = new Double(xNumber.doubleValue());
                    // store Number as Double

                // check if starting new column
                if (x != this.xValues[k].doubleValue()) {
                    tmpVector.add(new Integer(k)); //store index where new
                                                   //column starts
                    x = this.xValues[k].doubleValue();
                                             // set x to most recent value
                }
            }
        }

        Object[] inttmp = tmpVector.toArray();
        this.xIndex = new int[inttmp.length];  // create array xIndex to hold
                                               // new column indices

        for (int i = 0; i < inttmp.length; i++) {
            this.xIndex[i] = ((Integer) inttmp[i]).intValue();
        }
        for (int k = 0; k < this.yValues.length; k++) { // store y and z axes
                                                        // as Doubles
            this.yValues[k] = (Double) yData[k];
            if (zData[k] != null) {
                this.zValues[k] = (Double) zData[k];
            }
        }
    }

    /**
     * Creates an object array from an array of doubles.
     *
     * @param data  the data.
     *
     * @return An array of <code>Double objects.
     */
    public static Object[][] formObjectArray(double[][] data) {
        Object[][] object = new Double[data.length][data[0].length];

        for (int i = 0; i < object.length; i++) {
            for (int j = 0; j < object[i].length; j++) {
                object[i][j] = new Double(data[i][j]);
            }
        }
        return object;
    }

    /**
     * Creates an object array from an array of doubles.
     *
     * @param data  the data.
     *
     * @return An array of <code>Double objects.
     */
    public static Object[] formObjectArray(double[] data) {
        Object[] object = new Double[data.length];
        for (int i = 0; i < object.length; i++) {
            object[i] = new Double(data[i]);
        }
        return object;
    }

    /**
     * Returns the number of items in the specified series.  This method
     * is provided to satisfy the {@link XYDataset} interface implementation.
     *
     * @param series  must be zero, as this dataset only supports one series.
     *
     * @return The item count.
     */
    public int getItemCount(int series) {
        if (series > 0) {
            throw new IllegalArgumentException("Only one series for contour");
        }
        return this.zValues.length;
    }

    /**
     * Returns the maximum z-value.
     *
     * @return The maximum z-value.
     */
    public double getMaxZValue() {
        double zMax = -1.e20;
        for (int k = 0; k < this.zValues.length; k++) {
            if (this.zValues[k] != null) {
                zMax = Math.max(zMax, this.zValues[k].doubleValue());
            }
        }
        return zMax;
    }

    /**
     * Returns the minimum z-value.
     *
     * @return The minimum z-value.
     */
    public double getMinZValue() {
        double zMin = 1.e20;
        for (int k = 0; k < this.zValues.length; k++) {
            if (this.zValues[k] != null) {
                zMin = Math.min(zMin, this.zValues[k].doubleValue());
            }
        }
        return zMin;
    }

    /**
     * Returns the maximum z-value within visible region of plot.
     *
     * @param x  the x range.
     * @param y  the y range.
     *
     * @return The z range.
     */
    public Range getZValueRange(Range x, Range y) {

        double minX = x.getLowerBound();
        double minY = y.getLowerBound();
        double maxX = x.getUpperBound();
        double maxY = y.getUpperBound();

        double zMin = 1.e20;
        double zMax = -1.e20;
        for (int k = 0; k < this.zValues.length; k++) {
            if (this.xValues[k].doubleValue() >= minX
                && this.xValues[k].doubleValue() <= maxX
                && this.yValues[k].doubleValue() >= minY
                && this.yValues[k].doubleValue() <= maxY) {
                if (this.zValues[k] != null) {
                    zMin = Math.min(zMin, this.zValues[k].doubleValue());
                    zMax = Math.max(zMax, this.zValues[k].doubleValue());
                }
            }
        }

        return new Range(zMin, zMax);
    }

    /**
     * Returns the minimum z-value.
     *
     * @param minX  the minimum x value.
     * @param minY  the minimum y value.
     * @param maxX  the maximum x value.
     * @param maxY  the maximum y value.
     *
     * @return The minimum z-value.
     */
    public double getMinZValue(double minX,
                               double minY,
                               double maxX,
                               double maxY) {

        double zMin = 1.e20;
        for (int k = 0; k < this.zValues.length; k++) {
            if (this.zValues[k] != null) {
                zMin = Math.min(zMin, this.zValues[k].doubleValue());
            }
        }
        return zMin;

    }

    /**
     * Returns the number of series.
     * <P>
     * Required by XYDataset interface (this will always return 1)
     *
     * @return 1.
     */
    public int getSeriesCount() {
        return 1;
    }

    /**
     * Returns the name of the specified series.
     *
     * Method provided to satisfy the XYDataset interface implementation
     *
     * @param series must be zero.
     *
     * @return The series name.
     */
    public Comparable getSeriesKey(int series) {
        if (series > 0) {
            throw new IllegalArgumentException("Only one series for contour");
        }
        return this.seriesKey;
    }

    /**
     * Returns the index of the xvalues.
     *
     * @return The x values.
     */
    public int[] getXIndices() {
        return this.xIndex;
    }

    /**
     * Returns the x values.
     *
     * @return The x values.
     */
    public Number[] getXValues() {
        return this.xValues;
    }

    /**
     * Returns the x value for the specified series and index (zero-based
     * indices).  Required by the {@link XYDataset}.
     *
     * @param series  must be zero;
     * @param item  the item index (zero-based).
     *
     * @return The x value.
     */
    public Number getX(int series, int item) {
        if (series > 0) {
            throw new IllegalArgumentException("Only one series for contour");
        }
        return this.xValues[item];
    }

    /**
     * Returns an x value.
     *
     * @param item  the item index (zero-based).
     *
     * @return The X value.
     */
    public Number getXValue(int item) {
        return this.xValues[item];
    }

    /**
     * Returns a Number array containing all y values.
     *
     * @return The Y values.
     */
    public Number[] getYValues() {
        return this.yValues;
    }

    /**
     * Returns the y value for the specified series and index (zero-based
     * indices).  Required by the {@link XYDataset}.
     *
     * @param series  the series index (must be zero for this dataset).
     * @param item  the item index (zero-based).
     *
     * @return The Y value.
     */
    public Number getY(int series, int item) {
        if (series > 0) {
            throw new IllegalArgumentException("Only one series for contour");
        }
        return this.yValues[item];
    }

    /**
     * Returns a Number array containing all z values.
     *
     * @return The Z values.
     */
    public Number[] getZValues() {
        return this.zValues;
    }

    /**
     * Returns the z value for the specified series and index (zero-based
     * indices).  Required by the {@link XYDataset}
     *
     * @param series  the series index (must be zero for this dataset).
     * @param item  the item index (zero-based).
     *
     * @return The Z value.
     */
    public Number getZ(int series, int item) {
        if (series > 0) {
            throw new IllegalArgumentException("Only one series for contour");
        }
        return this.zValues[item];
    }

    /**
     * Returns an int array contain the index into the x values.
     *
     * @return The X values.
     */
    public int[] indexX() {
        int[] index = new int[this.xValues.length];
        for (int k = 0; k < index.length; k++) {
            index[k] = indexX(k);
        }
        return index;
    }

    /**
     * Given index k, returns the column index containing k.
     *
     * @param k index of interest.
     *
     * @return The column index.
     */
    public int indexX(int k) {
        int i = Arrays.binarySearch(this.xIndex, k);
        if (i >= 0) {
            return i;
        }
        else {
            return -1 * i - 2;
        }
    }


    /**
     * Given index k, return the row index containing k.
     *
     * @param k index of interest.
     *
     * @return The row index.
     */
    public int indexY(int k) { // this may be obsolete (not used anywhere)
        return (k / this.xValues.length);
    }

    /**
     * Given column and row indices, returns the k index.
     *
     * @param i index of along x-axis.
     * @param j index of along y-axis.
     *
     * @return The Z index.
     */
    public int indexZ(int i, int j) {
        return this.xValues.length * j + i;
    }

    /**
     * Returns true if axis are dates.
     *
     * @param axisNumber The axis where 0-x, 1-y, and 2-z.
     *
     * @return A boolean.
     */
    public boolean isDateAxis(int axisNumber) {
        if (axisNumber < 0 || axisNumber > 2) {
            return false; // bad axisNumber
        }
        return this.dateAxis[axisNumber];
    }

    /**
     * Sets the names of the series in the data source.
     *
     * @param seriesKeys  the keys of the series in the data source.
     */
    public void setSeriesKeys(Comparable[] seriesKeys) {
        if (seriesKeys.length > 1) {
            throw new IllegalArgumentException(
                    "Contours only support one series");
        }
        this.seriesKey = seriesKeys[0];
        fireDatasetChanged();
    }

}

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