/* ===========================================================
 * 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., 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.]
 *
 * --------------------
 * XYBoxAnnotation.java
 * --------------------
 * (C) Copyright 2005, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: XYBoxAnnotation.java,v 1.5.2.2 2005/10/25 16:51:15 mungady Exp $
 *
 * Changes:
 * --------
 * 19-Jan-2005 : Version 1 (DG);
 * 06-Jun-2005 : Fixed equals() method to handle GradientPaint (DG);
 * 
 */
 
package org.jfree.chart.annotations;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
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.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.io.SerialUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A box annotation that can be placed on an {@link XYPlot}.  The 
 * box coordinates are specified in data space.
 */
public class XYBoxAnnotation extends AbstractXYAnnotation
                             implements Cloneable, 
                                        PublicCloneable, 
                                        Serializable {
    
    /** For serialization. */
    private static final long serialVersionUID = 6764703772526757457L;
    
    /** The lower x-coordinate. */
    private double x0;
    
    /** The lower y-coordinate. */
    private double y0;

    /** The upper x-coordinate. */
    private double x1;
    
    /** The upper y-coordinate. */
    private double y1;

    /** The stroke used to draw the box outline. */
    private transient Stroke stroke;

    /** The paint used to draw the box outline. */
    private transient Paint outlinePaint;
    
    /** The paint used to fill the box. */
    private transient Paint fillPaint;

    /**
     * Creates a new annotation (where, by default, the box is drawn 
     * with a black outline).
     * 
     * @param x0  the lower x-coordinate of the box (in data space).
     * @param y0  the lower y-coordinate of the box (in data space).
     * @param x1  the upper x-coordinate of the box (in data space).
     * @param y1  the upper y-coordinate of the box (in data space).
     */
    public XYBoxAnnotation(double x0, double y0, double x1, double y1) {
        this(x0, y0, x1, y1, new BasicStroke(1.0f), Color.black);
    }
    
    /**
     * Creates a new annotation where the box is drawn as an outline using
     * the specified <code>stroke</code> and <code>outlinePaint</code>.
     *
     * @param x0  the lower x-coordinate of the box (in data space).
     * @param y0  the lower y-coordinate of the box (in data space).
     * @param x1  the upper x-coordinate of the box (in data space).
     * @param y1  the upper y-coordinate of the box (in data space).
     * @param stroke  the shape stroke (<code>null</code> not permitted).
     * @param outlinePaint  the shape color (<code>null</code> not permitted).
     */
    public XYBoxAnnotation(double x0, double y0, double x1, double y1, 
                           Stroke stroke, Paint outlinePaint) {
        this(x0, y0, x1, y1, stroke, outlinePaint, null);
    }

    /**
     * Creates a new annotation.
     *
     * @param x0  the lower x-coordinate of the box (in data space).
     * @param y0  the lower y-coordinate of the box (in data space).
     * @param x1  the upper x-coordinate of the box (in data space).
     * @param y1  the upper y-coordinate of the box (in data space).
     * @param stroke  the shape stroke (<code>null</code> permitted).
     * @param outlinePaint  the shape color (<code>null</code> permitted).
     * @param fillPaint  the paint used to fill the shape (<code>null</code> 
     *                   permitted).
     */
    public XYBoxAnnotation(double x0, double y0, double x1, double y1, 
                           Stroke stroke, Paint outlinePaint, Paint fillPaint) {
        this.x0 = x0;
        this.y0 = y0;
        this.x1 = x1;
        this.y1 = y1;
        this.stroke = stroke;
        this.outlinePaint = outlinePaint;
        this.fillPaint = fillPaint;
    }

    /**
     * Draws the annotation.  This method is usually called by the 
     * {@link XYPlot} class, you shouldn't need to call it 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  the plot rendering info.
     */
    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
        );

        double transX0 = domainAxis.valueToJava2D(
            this.x0, dataArea, domainEdge
        ); 
        double transY0 = rangeAxis.valueToJava2D(this.y0, dataArea, rangeEdge); 
        double transX1 = domainAxis.valueToJava2D(
            this.x1, dataArea, domainEdge
        ); 
        double transY1 = rangeAxis.valueToJava2D(this.y1, dataArea, rangeEdge); 

        Rectangle2D box = null;
        if (orientation == PlotOrientation.HORIZONTAL) {
            box = new Rectangle2D.Double(
                transY0, transX1, transY1 - transY0, transX0 - transX1
            );
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            box = new Rectangle2D.Double(
                transX0, transY1, transX1 - transX0, transY0 - transY1
            );
        }

        if (this.fillPaint != null) {
            g2.setPaint(this.fillPaint);
            g2.fill(box);
        }
        
        if (this.stroke != null && this.outlinePaint != null) {
            g2.setPaint(this.outlinePaint);
            g2.setStroke(this.stroke);
            g2.draw(box);
        }
        addEntity(info, box, rendererIndex, getToolTipText(), getURL());
        
    }
        
    /**
     * Tests this annotation for equality with an arbitrary object.
     * 
     * @param obj  the object (<code>null</code> 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 XYBoxAnnotation)) {
            return false;
        }
        XYBoxAnnotation that = (XYBoxAnnotation) obj;
        if (!(this.x0 == that.x0)) {
            return false;
        }
        if (!(this.y0 == that.y0)) {
            return false;
        }
        if (!(this.x1 == that.x1)) {
            return false;
        }
        if (!(this.y1 == that.y1)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.stroke, that.stroke)) {
            return false;
        }
        if (!PaintUtilities.equal(this.outlinePaint, that.outlinePaint)) {
            return false;
        }
        if (!PaintUtilities.equal(this.fillPaint, that.fillPaint)) {
            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.x0);
        result = (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.x1);
        result = 29 * result + (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.y0);
        result = 29 * result + (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.y1);
        result = 29 * result + (int) (temp ^ (temp >>> 32));
        return result;
    }

    /**
     * Returns a clone.
     * 
     * @return A clone.
     * 
     * @throws CloneNotSupportedException not thrown by this class, but may be
     *                                    by subclasses.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
    
    /**
     * Provides serialization support.
     *
     * @param stream  the output stream (<code>null</code> not permitted).
     *
     * @throws IOException if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtilities.writeStroke(this.stroke, stream);
        SerialUtilities.writePaint(this.outlinePaint, stream);
        SerialUtilities.writePaint(this.fillPaint, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream (<code>null</code> not permitted).
     *
     * @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.stroke = SerialUtilities.readStroke(stream);
        this.outlinePaint = SerialUtilities.readPaint(stream);
        this.fillPaint = SerialUtilities.readPaint(stream);
    }

}