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jfreechart example source code file (AbstractXYAnnotation.java)

This example jfreechart source code file (AbstractXYAnnotation.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

abstractxyannotation, abstractxyannotation, awt, entitycollection, geometry, plotrenderinginfo, rectangle2d, shape, string, string, valueaxis, valueaxis, xyannotation, xyannotationentity, xyannotationentity, xyplot

The jfreechart AbstractXYAnnotation.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.]
 *
 * -------------------------
 * AbstractXYAnnotation.java
 * -------------------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 29-Sep-2004 : Version 1 (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 06-Mar-2007 : Implemented hashCode() (DG);
 *
 */

package org.jfree.chart.annotations;

import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.Rectangle2D;

import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.XYAnnotationEntity;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.util.ObjectUtilities;

/**
 * The interface that must be supported by annotations that are to be added to
 * an {@link XYPlot}.
 */
public abstract class AbstractXYAnnotation implements XYAnnotation {

    /** The tool tip text. */
    private String toolTipText;

    /** The URL. */
    private String url;

    /**
     * Creates a new instance that has no tool tip or URL specified.
     */
    protected AbstractXYAnnotation() {
        this.toolTipText = null;
        this.url = null;
    }

    /**
     * Returns the tool tip text for the annotation.  This will be displayed in
     * a {@link org.jfree.chart.ChartPanel} when the mouse pointer hovers over
     * the annotation.
     *
     * @return The tool tip text (possibly <code>null).
     *
     * @see #setToolTipText(String)
     */
    public String getToolTipText() {
        return this.toolTipText;
    }

    /**
     * Sets the tool tip text for the annotation.
     *
     * @param text  the tool tip text (<code>null permitted).
     *
     * @see #getToolTipText()
     */
    public void setToolTipText(String text) {
        this.toolTipText = text;
    }

    /**
     * Returns the URL for the annotation.  This URL will be used to provide
     * hyperlinks when an HTML image map is created for the chart.
     *
     * @return The URL (possibly <code>null).
     *
     * @see #setURL(String)
     */
    public String getURL() {
        return this.url;
    }

    /**
     * Sets the URL for the annotation.
     *
     * @param url  the URL (<code>null permitted).
     *
     * @see #getURL()
     */
    public void setURL(String url) {
        this.url = url;
    }

    /**
     * Draws the annotation.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the data area.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param rendererIndex  the renderer index.
     * @param info  if supplied, this info object will be populated with
     *              entity information.
     */
    public abstract void draw(Graphics2D g2, XYPlot plot, Rectangle2D dataArea,
                              ValueAxis domainAxis, ValueAxis rangeAxis,
                              int rendererIndex,
                              PlotRenderingInfo info);

    /**
     * A utility method for adding an {@link XYAnnotationEntity} to
     * a {@link PlotRenderingInfo} instance.
     *
     * @param info  the plot rendering info (<code>null permitted).
     * @param hotspot  the hotspot area.
     * @param rendererIndex  the renderer index.
     * @param toolTipText  the tool tip text.
     * @param urlText  the URL text.
     */
    protected void addEntity(PlotRenderingInfo info,
                             Shape hotspot, int rendererIndex,
                             String toolTipText, String urlText) {
        if (info == null) {
            return;
        }
        EntityCollection entities = info.getOwner().getEntityCollection();
        if (entities == null) {
            return;
        }
        XYAnnotationEntity entity = new XYAnnotationEntity(hotspot,
                rendererIndex, toolTipText, urlText);
        entities.add(entity);
    }

    /**
     * Tests this annotation 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 AbstractXYAnnotation)) {
            return false;
        }
        AbstractXYAnnotation that = (AbstractXYAnnotation) obj;
        if (!ObjectUtilities.equal(this.toolTipText, that.toolTipText)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.url, that.url)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code for this instance.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = 193;
        if (this.toolTipText != null) {
            result = 37 * result + this.toolTipText.hashCode();
        }
        if (this.url != null) {
            result = 37 * result + this.url.hashCode();
        }
        return result;
    }

}

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