xydrawableannotation.java

JfreeChart 常用图表例子

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * -------------------------
 * XYDrawableAnnotation.java
 * -------------------------
 * (C) Copyright 2003, 2004, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: XYDrawableAnnotation.java,v 1.6 2005/05/19 15:41:53 mungady Exp $
 *
 * 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);
 *
 */

package org.jfree.chart.annotations;

import java.awt.Graphics2D;
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 org.jfree.chart.plot.XYPlot}.
 */
public class XYDrawableAnnotation extends AbstractXYAnnotation
                                  implements Cloneable, PublicCloneable, 
                                             Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -6540812859722691020L;
    
    /** The x-coordinate. */
    private double x;

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

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

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

    /** 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</code> not permitted).
     */
    public XYDrawableAnnotation(double x, double y, double width, double height,
                                Drawable drawable) {

        if (drawable == null) {
            throw new IllegalArgumentException("Null 'drawable' argument.");
        }
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
        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 area = new Rectangle2D.Double(
            j2DX - this.width / 2.0, j2DY - this.height / 2.0,
            this.width, this.height
        );
        this.drawable.draw(g2, area);
        String toolTip = getToolTipText();
        String url = getURL();
        if (toolTip != null || url != null) {
            addEntity(info, area, rendererIndex, toolTip, url);
        }
        
    }

    /**
     * Tests this annotation for equality with an arbitrary object.
     * 
     * @param obj  the object to test against.
     * 
     * @return <code>true</code> or <code>false</code>.
     */
    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.width != that.width) {
            return false;
        }
        if (this.height != that.height) {
            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.width);
        result = 29 * result + (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.height);
        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();
    }

}