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jfreechart example source code file (XYDrawableAnnotation.java)

This example jfreechart source code file (XYDrawableAnnotation.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, clonenotsupportedexception, drawable, drawable, geometry, io, publiccloneable, rectangle2d, rectangle2d, rectangleedge, serializable, string, string, valueaxis, xydrawableannotation, xydrawableannotation, xyplot

The jfreechart XYDrawableAnnotation.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.]
 *
 * -------------------------
 * XYDrawableAnnotation.java
 * -------------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 21-May-2003 : Version 1 (DG);
 * 21-Jan-2004 : Update for renamed method in ValueAxis (DG);
 * 30-Sep-2004 : Added support for tool tips and URLs (DG);
 * 18-Jun-2008 : Added scaling factor (DG);
 *
 */

package org.jfree.chart.annotations;

import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;

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.Drawable;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A general annotation that can be placed on an {@link XYPlot}.
 */
public class XYDrawableAnnotation extends AbstractXYAnnotation
        implements Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -6540812859722691020L;

    /** The scaling factor. */
    private double drawScaleFactor;

    /** The x-coordinate. */
    private double x;

    /** The y-coordinate. */
    private double y;

    /** The width. */
    private double displayWidth;

    /** The height. */
    private double displayHeight;

    /** The drawable object. */
    private Drawable drawable;

    /**
     * Creates a new annotation to be displayed within the given area.
     *
     * @param x  the x-coordinate for the area.
     * @param y  the y-coordinate for the area.
     * @param width  the width of the area.
     * @param height  the height of the area.
     * @param drawable  the drawable object (<code>null not permitted).
     */
    public XYDrawableAnnotation(double x, double y, double width, double height,
                                Drawable drawable) {
        this(x, y, width, height, 1.0, drawable);
    }

    /**
     * Creates a new annotation to be displayed within the given area.  If you
     * specify a <code>drawScaleFactor of 2.0, the drawable
     * will be drawn at twice the requested display size then scaled down to
     * fit the space.
     *
     * @param x  the x-coordinate for the area.
     * @param y  the y-coordinate for the area.
     * @param displayWidth  the width of the area.
     * @param displayHeight  the height of the area.
     * @param drawScaleFactor  the scaling factor for drawing.
     * @param drawable  the drawable object (<code>null not permitted).
     *
     * @since 1.0.11
     */
    public XYDrawableAnnotation(double x, double y, double displayWidth,
            double displayHeight, double drawScaleFactor, Drawable drawable) {

        if (drawable == null) {
            throw new IllegalArgumentException("Null 'drawable' argument.");
        }
        this.x = x;
        this.y = y;
        this.displayWidth = displayWidth;
        this.displayHeight = displayHeight;
        this.drawScaleFactor = drawScaleFactor;
        this.drawable = drawable;

    }

    /**
     * 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 void draw(Graphics2D g2, XYPlot plot, Rectangle2D dataArea,
                     ValueAxis domainAxis, ValueAxis rangeAxis,
                     int rendererIndex,
                     PlotRenderingInfo info) {

        PlotOrientation orientation = plot.getOrientation();
        RectangleEdge domainEdge = Plot.resolveDomainAxisLocation(
                plot.getDomainAxisLocation(), orientation);
        RectangleEdge rangeEdge = Plot.resolveRangeAxisLocation(
                plot.getRangeAxisLocation(), orientation);
        float j2DX = (float) domainAxis.valueToJava2D(this.x, dataArea,
                domainEdge);
        float j2DY = (float) rangeAxis.valueToJava2D(this.y, dataArea,
                rangeEdge);
        Rectangle2D displayArea = new Rectangle2D.Double(
                j2DX - this.displayWidth / 2.0,
                j2DY - this.displayHeight / 2.0, this.displayWidth,
                this.displayHeight);

        // here we change the AffineTransform so we can draw the annotation
        // to a larger area and scale it down into the display area
        // afterwards, the original transform is restored
        AffineTransform savedTransform = g2.getTransform();
        Rectangle2D drawArea = new Rectangle2D.Double(0.0, 0.0,
                this.displayWidth * this.drawScaleFactor,
                this.displayHeight * this.drawScaleFactor);

        g2.scale(1/this.drawScaleFactor, 1/this.drawScaleFactor);
        g2.translate((j2DX - this.displayWidth / 2.0) * this.drawScaleFactor,
                (j2DY - this.displayHeight / 2.0) * this.drawScaleFactor);
        this.drawable.draw(g2, drawArea);
        g2.setTransform(savedTransform);
        String toolTip = getToolTipText();
        String url = getURL();
        if (toolTip != null || url != null) {
            addEntity(info, displayArea, rendererIndex, toolTip, url);
        }

    }

    /**
     * Tests this annotation for equality with an arbitrary object.
     *
     * @param obj  the object to test against.
     *
     * @return <code>true or false.
     */
    public boolean equals(Object obj) {

        if (obj == this) { // simple case
            return true;
        }
        // now try to reject equality...
        if (!super.equals(obj)) {
            return false;
        }
        if (!(obj instanceof XYDrawableAnnotation)) {
            return false;
        }
        XYDrawableAnnotation that = (XYDrawableAnnotation) obj;
        if (this.x != that.x) {
            return false;
        }
        if (this.y != that.y) {
            return false;
        }
        if (this.displayWidth != that.displayWidth) {
            return false;
        }
        if (this.displayHeight != that.displayHeight) {
            return false;
        }
        if (this.drawScaleFactor != that.drawScaleFactor) {
            return false;
        }
        if (!ObjectUtilities.equal(this.drawable, that.drawable)) {
            return false;
        }
        // seem to be the same...
        return true;

    }

    /**
     * Returns a hash code.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result;
        long temp;
        temp = Double.doubleToLongBits(this.x);
        result = (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.y);
        result = 29 * result + (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.displayWidth);
        result = 29 * result + (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.displayHeight);
        result = 29 * result + (int) (temp ^ (temp >>> 32));
        return result;
    }

    /**
     * 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();
    }

}

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