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jfreechart example source code file (XYImageAnnotation.java)

This example jfreechart source code file (XYImageAnnotation.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, axislocation, geometry, illegalargumentexception, image, image, io, ioexception, ioexception, null, rectangle2d, rectangleanchor, rectangleanchor, string, valueaxis, xyimageannotation, xyimageannotation

The jfreechart XYImageAnnotation.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.]
 *
 * ----------------------
 * XYImageAnnotation.java
 * ----------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Mike Harris;
 *
 * Changes:
 * --------
 * 01-Dec-2003 : Version 1 (DG);
 * 21-Jan-2004 : Update for renamed method in ValueAxis (DG);
 * 18-May-2004 : Fixed bug with plot orientation (DG);
 * 29-Sep-2004 : Now extends AbstractXYAnnotation, with modified draw()
 *               method signature and updated equals() method (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 01-Dec-2006 : Added anchor attribute (see patch 1584860 from
 *               Mike Harris) (DG);
 */

package org.jfree.chart.annotations;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import org.jfree.chart.axis.AxisLocation;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.ui.RectangleAnchor;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * An annotation that allows an image to be placed at some location on
 * an {@link XYPlot}.
 *
 * TODO:  implement serialization properly (image is not serializable).
 */
public class XYImageAnnotation extends AbstractXYAnnotation
        implements Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -4364694501921559958L;

    /** The x-coordinate (in data space). */
    private double x;

    /** The y-coordinate (in data space). */
    private double y;

    /** The image. */
    private transient Image image;

    /**
     * The image anchor point.
     *
     * @since 1.0.4
     */
    private RectangleAnchor anchor;

    /**
     * Creates a new annotation to be displayed at the specified (x, y)
     * location.
     *
     * @param x  the x-coordinate (in data space).
     * @param y  the y-coordinate (in data space).
     * @param image  the image (<code>null not permitted).
     */
    public XYImageAnnotation(double x, double y, Image image) {
        this(x, y, image, RectangleAnchor.CENTER);
    }

    /**
     * Creates a new annotation to be displayed at the specified (x, y)
     * location.
     *
     * @param x  the x-coordinate (in data space).
     * @param y  the y-coordinate (in data space).
     * @param image  the image (<code>null not permitted).
     * @param anchor  the image anchor (<code>null not permitted).
     *
     * @since 1.0.4
     */
    public XYImageAnnotation(double x, double y, Image image,
            RectangleAnchor anchor) {
        if (image == null) {
            throw new IllegalArgumentException("Null 'image' argument.");
        }
        if (anchor == null) {
            throw new IllegalArgumentException("Null 'anchor' argument.");
        }
        this.x = x;
        this.y = y;
        this.image = image;
        this.anchor = anchor;
    }

    /**
     * Returns the x-coordinate (in data space) for the annotation.
     *
     * @return The x-coordinate.
     *
     * @since 1.0.4
     */
    public double getX() {
        return this.x;
    }

    /**
     * Returns the y-coordinate (in data space) for the annotation.
     *
     * @return The y-coordinate.
     *
     * @since 1.0.4
     */
    public double getY() {
        return this.y;
    }

    /**
     * Returns the image for the annotation.
     *
     * @return The image.
     *
     * @since 1.0.4
     */
    public Image getImage() {
        return this.image;
    }

    /**
     * Returns the image anchor for the annotation.
     *
     * @return The image anchor.
     *
     * @since 1.0.4
     */
    public RectangleAnchor getImageAnchor() {
        return this.anchor;
    }

    /**
     * Draws the annotation.  This method is called by the drawing code in the
     * {@link XYPlot} class, you don't normally need to call this method
     * directly.
     *
     * @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 void draw(Graphics2D g2, XYPlot plot, Rectangle2D dataArea,
                     ValueAxis domainAxis, ValueAxis rangeAxis,
                     int rendererIndex,
                     PlotRenderingInfo info) {

        PlotOrientation orientation = plot.getOrientation();
        AxisLocation domainAxisLocation = plot.getDomainAxisLocation();
        AxisLocation rangeAxisLocation = plot.getRangeAxisLocation();
        RectangleEdge domainEdge
            = Plot.resolveDomainAxisLocation(domainAxisLocation, orientation);
        RectangleEdge rangeEdge
            = Plot.resolveRangeAxisLocation(rangeAxisLocation, orientation);
        float j2DX
            = (float) domainAxis.valueToJava2D(this.x, dataArea, domainEdge);
        float j2DY
            = (float) rangeAxis.valueToJava2D(this.y, dataArea, rangeEdge);
        float xx = 0.0f;
        float yy = 0.0f;
        if (orientation == PlotOrientation.HORIZONTAL) {
            xx = j2DY;
            yy = j2DX;
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            xx = j2DX;
            yy = j2DY;
        }
        int w = this.image.getWidth(null);
        int h = this.image.getHeight(null);

        Rectangle2D imageRect = new Rectangle2D.Double(0, 0, w, h);
        Point2D anchorPoint = RectangleAnchor.coordinates(imageRect,
                this.anchor);
        xx = xx - (float) anchorPoint.getX();
        yy = yy - (float) anchorPoint.getY();
        g2.drawImage(this.image, (int) xx, (int) yy, null);

        String toolTip = getToolTipText();
        String url = getURL();
        if (toolTip != null || url != null) {
            addEntity(info, new Rectangle2D.Float(xx, yy, w, h), rendererIndex,
                    toolTip, url);
        }
    }

    /**
     * Tests this object 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;
        }
        // now try to reject equality...
        if (!super.equals(obj)) {
            return false;
        }
        if (!(obj instanceof XYImageAnnotation)) {
            return false;
        }
        XYImageAnnotation that = (XYImageAnnotation) obj;
        if (this.x != that.x) {
            return false;
        }
        if (this.y != that.y) {
            return false;
        }
        if (!ObjectUtilities.equal(this.image, that.image)) {
            return false;
        }
        if (!this.anchor.equals(that.anchor)) {
            return false;
        }
        // seems to be the same...
        return true;
    }

    /**
     * Returns a hash code for this object.
     *
     * @return A hash code.
     */
    public int hashCode() {
        return this.image.hashCode();
    }

    /**
     * Returns a clone of the annotation.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException  if the annotation can't be cloned.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        //SerialUtilities.writeImage(this.image, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream)
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        //this.image = SerialUtilities.readImage(stream);
    }


}

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