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jfreechart example source code file (ColorPalette.java)

This example jfreechart source code file (ColorPalette.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

awt, cloneable, clonenotsupportedexception, color, color, colorpalette, colorpalette, for, io, object, paint, paint, serializable, string, string, util, valuetick

The jfreechart ColorPalette.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.]
 *
 * -----------------
 * ColorPalette.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
 * -------
 * 26-Nov-2002 : Version 1 contributed by David M. O'Donnell (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 14-Aug-2003 : Implemented Cloneable (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 31-Jan-2007 : Deprecated (DG);
 *
 */

package org.jfree.chart.plot;

import java.awt.Color;
import java.awt.Paint;
import java.io.Serializable;
import java.util.Arrays;

import org.jfree.chart.axis.ValueTick;
import org.jfree.chart.renderer.xy.XYBlockRenderer;

/**
 * Defines palette used by {@link ContourPlot}.
 *
 * @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 abstract class ColorPalette implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -9029901853079622051L;

    /** The min z-axis value. */
    protected double minZ = -1;

    /** The max z-axis value. */
    protected double maxZ = -1;

    /** Red components. */
    protected int[] r;

    /** Green components. */
    protected int[] g;

    /** Blue components. */
    protected int[] b;

    /** Tick values are stored for use with stepped palette. */
    protected double[] tickValues = null;

    /** Logscale? */
    protected boolean logscale = false;

    /** Inverse palette (ie, min and max colors are reversed). */
    protected boolean inverse = false;

    /** The palette name. */
    protected String paletteName = null;

    /** Controls whether palette colors are stepped (not continuous). */
    protected boolean stepped = false;

    /** Constant for converting loge to log10. */
    protected static final double log10 = Math.log(10);

    /**
     * Default contructor.
     */
    public ColorPalette() {
        super();
    }

    /**
     * Returns the color associated with a value.
     *
     * @param value  the value.
     *
     * @return The color.
     */
    public Paint getColor(double value) {
        int izV = (int) (253 * (value - this.minZ)
                    / (this.maxZ - this.minZ)) + 2;
        return new Color(this.r[izV], this.g[izV], this.b[izV]);
    }

    /**
     * Returns a color.
     *
     * @param izV  the index into the palette (zero based).
     *
     * @return The color.
     */
    public Color getColor(int izV) {
        return new Color(this.r[izV], this.g[izV], this.b[izV]);
    }

    /**
     * Returns Color by mapping a given value to a linear palette.
     *
     * @param value  the value.
     *
     * @return The color.
     */
    public Color getColorLinear(double value) {
        int izV = 0;
        if (this.stepped) {
            int index = Arrays.binarySearch(this.tickValues, value);
            if (index < 0) {
                index = -1 * index - 2;
            }

            if (index < 0) { // For the case were the first tick is greater
                             // than minZ
                value = this.minZ;
            }
            else {
                value = this.tickValues[index];
            }
        }
        izV = (int) (253 * (value - this.minZ) / (this.maxZ - this.minZ)) + 2;
        izV = Math.min(izV, 255);
        izV = Math.max(izV, 2);
        return getColor(izV);
    }

    /**
     * Returns Color by mapping a given value to a common log palette.
     *
     * @param value  the value.
     *
     * @return The color.
     */
    public Color getColorLog(double value) {
        int izV = 0;
        double minZtmp = this.minZ;
        double maxZtmp = this.maxZ;
        if (this.minZ <= 0.0) {
//          negatives = true;
            this.maxZ = maxZtmp - minZtmp + 1;
            this.minZ = 1;
            value = value - minZtmp + 1;
        }
        double minZlog = Math.log(this.minZ) / log10;
        double maxZlog = Math.log(this.maxZ) / log10;
        value = Math.log(value) / log10;
        //  value = Math.pow(10,value);
        if (this.stepped) {
            int numSteps = this.tickValues.length;
            int steps = 256 / (numSteps - 1);
            izV = steps * (int) (numSteps * (value - minZlog)
                    / (maxZlog - minZlog)) + 2;
            //  izV = steps*numSteps*(int)((value/minZ)/(maxZlog-minZlog)) + 2;
        }
        else {
            izV = (int) (253 * (value - minZlog) / (maxZlog - minZlog)) + 2;
        }
        izV = Math.min(izV, 255);
        izV = Math.max(izV, 2);

        this.minZ = minZtmp;
        this.maxZ = maxZtmp;

        return getColor(izV);
    }

    /**
     * Returns the maximum Z value.
     *
     * @return The value.
     */
    public double getMaxZ() {
        return this.maxZ;
    }

    /**
     * Returns the minimum Z value.
     *
     * @return The value.
     */
    public double getMinZ() {
        return this.minZ;
    }

    /**
     * Returns Paint by mapping a given value to a either a linear or common
     * log palette as controlled by the value logscale.
     *
     * @param value  the value.
     *
     * @return The paint.
     */
    public Paint getPaint(double value) {
        if (isLogscale()) {
            return getColorLog(value);
        }
        else {
            return getColorLinear(value);
        }
    }

    /**
     * Returns the palette name.
     *
     * @return The palette name.
     */
    public String getPaletteName () {
        return this.paletteName;
    }

    /**
     * Returns the tick values.
     *
     * @return The tick values.
     */
    public double[] getTickValues() {
        return this.tickValues;
    }

    /**
     * Called to initialize the palette's color indexes
     */
    public abstract void initialize();

    /**
     * Inverts Palette
     */
    public void invertPalette() {

        int[] red = new int[256];
        int[] green = new int[256];
        int[] blue = new int[256];
        for (int i = 0; i < 256; i++) {
            red[i] = this.r[i];
            green[i] = this.g[i];
            blue[i] = this.b[i];
        }

        for (int i = 2; i < 256; i++) {
            this.r[i] = red[257 - i];
            this.g[i] = green[257 - i];
            this.b[i] = blue[257 - i];
        }
    }

    /**
     * Returns the inverse flag.
     *
     * @return The flag.
     */
    public boolean isInverse () {
        return this.inverse;
    }

    /**
     * Returns the log-scale flag.
     *
     * @return The flag.
     */
    public boolean isLogscale() {
        return this.logscale;
    }

    /**
     * Returns the 'is-stepped' flag.
     *
     * @return The flag.
     */
    public boolean isStepped () {
        return this.stepped;
    }

    /**
     * Sets the inverse flag.
     *
     * @param inverse  the new value.
     */
    public void setInverse (boolean inverse) {
        this.inverse = inverse;
        initialize();
        if (inverse) {
            invertPalette();
        }
        return;
    }

    /**
     * Sets the 'log-scale' flag.
     *
     * @param logscale  the new value.
     */
    public void setLogscale(boolean logscale) {
        this.logscale = logscale;
    }

    /**
     * Sets the maximum Z value.
     *
     * @param newMaxZ  the new value.
     */
    public void setMaxZ(double newMaxZ) {
        this.maxZ = newMaxZ;
    }

    /**
     * Sets the minimum Z value.
     *
     * @param newMinZ  the new value.
     */
    public void setMinZ(double newMinZ) {
        this.minZ = newMinZ;
    }

    /**
     * Sets the palette name.
     *
     * @param paletteName  the name.
     */
    public void setPaletteName (String paletteName) {
        //String oldValue = this.paletteName;
        this.paletteName = paletteName;
        return;
    }

    /**
     * Sets the stepped flag.
     *
     * @param stepped  the flag.
     */
    public void setStepped (boolean stepped) {
        this.stepped = stepped;
        return;
    }

    /**
     * Sets the tick values.
     *
     * @param newTickValues  the tick values.
     */
    public void setTickValues(double[] newTickValues) {
        this.tickValues = newTickValues;
    }

    /**
     * Store ticks. Required when doing stepped axis
     *
     * @param ticks  the ticks.
     */
    public void setTickValues(java.util.List ticks) {
        this.tickValues = new double[ticks.size()];
        for (int i = 0; i < this.tickValues.length; i++) {
            this.tickValues[i] = ((ValueTick) ticks.get(i)).getValue();
        }
    }

    /**
     * Tests an object for equality with this instance.
     *
     * @param o  the object to test.
     *
     * @return A boolean.
     */
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof ColorPalette)) {
            return false;
        }

        ColorPalette colorPalette = (ColorPalette) o;

        if (this.inverse != colorPalette.inverse) {
            return false;
        }
        if (this.logscale != colorPalette.logscale) {
            return false;
        }
        if (this.maxZ != colorPalette.maxZ) {
            return false;
        }
        if (this.minZ != colorPalette.minZ) {
            return false;
        }
        if (this.stepped != colorPalette.stepped) {
            return false;
        }
        if (!Arrays.equals(this.b, colorPalette.b)) {
            return false;
        }
        if (!Arrays.equals(this.g, colorPalette.g)) {
            return false;
        }
        if (this.paletteName != null
                ? !this.paletteName.equals(colorPalette.paletteName)
                : colorPalette.paletteName != null) {
            return false;
        }
        if (!Arrays.equals(this.r, colorPalette.r)) {
            return false;
        }
        if (!Arrays.equals(this.tickValues, colorPalette.tickValues)) {
            return false;
        }

        return true;
    }

    /**
     * Returns a hash code.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result;
        long temp;
        temp = Double.doubleToLongBits(this.minZ);
        result = (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.maxZ);
        result = 29 * result + (int) (temp ^ (temp >>> 32));
        result = 29 * result + (this.logscale ? 1 : 0);
        result = 29 * result + (this.inverse ? 1 : 0);
        result = 29 * result
                 + (this.paletteName != null ? this.paletteName.hashCode() : 0);
        result = 29 * result + (this.stepped ? 1 : 0);
        return result;
    }

    /**
     * Returns a clone of the palette.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException never.
     */
    public Object clone() throws CloneNotSupportedException {

        ColorPalette clone = (ColorPalette) super.clone();
        return clone;

    }

}

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