xydrawableannotation.java

jfreechart安装程序和使用说明

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2004, 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 1.1 2004/08/31 14:28:00 mungady Exp $
 *
 * Changes:
 * --------
 * 21-May-2003 : Version 1 (DG);
 * 21-Jan-2004 : Update for renamed method in ValueAxis (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.XYPlot;
import org.jfree.ui.Drawable;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.ObjectUtils;

/**
 * A general annotation that can be placed on an {@link org.jfree.chart.plot.XYPlot}.
 *
 */
public class XYDrawableAnnotation implements XYAnnotation, Cloneable, Serializable {

    /** 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.
     */
    public XYDrawableAnnotation(double x, double y, double width, double height,
                                Drawable drawable) {

        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.
     */
    public void draw(Graphics2D g2, XYPlot plot, Rectangle2D dataArea,
                     ValueAxis domainAxis, ValueAxis rangeAxis) {

        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);

    }

    /**
     * Tests this annotation for equality with an object.
     * 
     * @param object  the object to test against.
     * 
     * @return <code>true</code> or <code>false</code>.
     */
    public boolean equals(Object object) {
        
        if (object == null) {
            return false;
        }
        
        if (object == this) {
            return true;
        }
        
        if (object instanceof XYDrawableAnnotation) {
        
            XYDrawableAnnotation a = (XYDrawableAnnotation) object;
            boolean b0 = (this.x == a.x);
            boolean b1 = (this.y == a.y);
            boolean b2 = (this.width == a.width);
            boolean b3 = (this.height == a.height);
            boolean b4 = ObjectUtils.equal(this.drawable, a.drawable);
            return b0 && b1 && b2 && b3 && b4;
        }
        
        return false;
        
    }
    
    /**
     * 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();
    }

}