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jfreechart example source code file (ValueMarker.java)

This example jfreechart source code file (ValueMarker.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, marker, marker, markerchangeevent, paint, paint, stroke, stroke, valuemarker, valuemarker

The jfreechart ValueMarker.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.]
 *
 * ----------------
 * ValueMarker.java
 * ----------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 09-Feb-2004 : Version 1 (DG);
 * 16-Feb-2005 : Added new constructor (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 05-Sep-2006 : Added setValue() method (DG);
 * 08-Oct-2007 : Fixed bug 1808376, constructor calling super with incorrect
 *               values (DG);
 *
 */

package org.jfree.chart.plot;

import java.awt.Paint;
import java.awt.Stroke;

import org.jfree.chart.event.MarkerChangeEvent;

/**
 * A marker that represents a single value.  Markers can be added to plots to
 * highlight specific values.
 */
public class ValueMarker extends Marker {

    /** The value. */
    private double value;

    /**
     * Creates a new marker.
     *
     * @param value  the value.
     */
    public ValueMarker(double value) {
        super();
        this.value = value;
    }

    /**
     * Creates a new marker.
     *
     * @param value  the value.
     * @param paint  the paint (<code>null not permitted).
     * @param stroke  the stroke (<code>null not permitted).
     */
    public ValueMarker(double value, Paint paint, Stroke stroke) {
        this(value, paint, stroke, paint, stroke, 1.0f);
    }

    /**
     * Creates a new value marker.
     *
     * @param value  the value.
     * @param paint  the paint (<code>null not permitted).
     * @param stroke  the stroke (<code>null not permitted).
     * @param outlinePaint  the outline paint (<code>null permitted).
     * @param outlineStroke  the outline stroke (<code>null permitted).
     * @param alpha  the alpha transparency (in the range 0.0f to 1.0f).
     */
    public ValueMarker(double value, Paint paint, Stroke stroke,
                       Paint outlinePaint, Stroke outlineStroke, float alpha) {
        super(paint, stroke, outlinePaint, outlineStroke, alpha);
        this.value = value;
    }

    /**
     * Returns the value.
     *
     * @return The value.
     *
     * @see #setValue(double)
     */
    public double getValue() {
        return this.value;
    }

    /**
     * Sets the value for the marker and sends a {@link MarkerChangeEvent} to
     * all registered listeners.
     *
     * @param value  the value.
     *
     * @see #getValue()
     *
     * @since 1.0.3
     */
    public void setValue(double value) {
        this.value = value;
        notifyListeners(new MarkerChangeEvent(this));
    }

    /**
     * Tests this marker for equality with an arbitrary object.  This method
     * returns <code>true if:
     *
     * <ul>
     * <li>obj is not null;
     * <li>obj is an instance of ValueMarker;
     * <li>obj has the same value as this marker;
     * <li>super.equals(obj) returns true.
     * </ul>
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!super.equals(obj)) {
            return false;
        }
        if (!(obj instanceof ValueMarker)) {
            return false;
        }
        ValueMarker that = (ValueMarker) obj;
        if (this.value != that.value) {
            return false;
        }
        return true;
    }
}

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