www.pudn.com > jfreechart-0.9.12.zip > XYLineAnnotation.java
/* ======================================
* JFreeChart : a free Java chart library
* ======================================
*
* Project Info: http://www.jfree.org/jfreechart/index.html
* Project Lead: David Gilbert (david.gilbert@object-refinery.com);
*
* (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
*
* 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.
*
* ---------------------
* XYLineAnnotation.java
* ---------------------
* (C) Copyright 2003 by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* $Id: XYLineAnnotation.java,v 1.8 2003/09/08 21:23:46 mungady Exp $
*
* Changes:
* --------
* 02-Apr-2003 : Version 1 (DG);
* 19-Aug-2003 : Added equals method, implemented Cloneable, and applied serialization fixes (DG);
*
*/
package org.jfree.chart.annotations;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Line2D;
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.XYPlot;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.ObjectUtils;
/**
* A simple line annotation that can be placed on an {@link XYPlot}.
*
* @author David Gilbert
*/
public class XYLineAnnotation implements XYAnnotation, Cloneable, Serializable {
/** The x-coordinate. */
private double x1;
/** The y-coordinate. */
private double y1;
/** The x-coordinate. */
private double x2;
/** The y-coordinate. */
private double y2;
/** The line stroke. */
private transient Stroke stroke;
/** The line color. */
private transient Paint paint;
/**
* Creates a new annotation to be displayed at the given coordinates.
*
* @param x1 the x-coordinate for the start of the line.
* @param y1 the y-coordinate for the start of the line.
* @param x2 the x-coordinate for the end of the line.
* @param y2 the y-coordinate for the end of the line.
* @param stroke the line stroke.
* @param paint the line color.
*/
public XYLineAnnotation(double x1, double y1, double x2, double y2,
Stroke stroke, Paint paint) {
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
this.stroke = stroke;
this.paint = paint;
}
/**
* 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 j2DX1 = (float) domainAxis.translateValueToJava2D(this.x1, dataArea, domainEdge);
float j2DY1 = (float) rangeAxis.translateValueToJava2D(this.y1, dataArea, rangeEdge);
float j2DX2 = (float) domainAxis.translateValueToJava2D(this.x2, dataArea, domainEdge);
float j2DY2 = (float) rangeAxis.translateValueToJava2D(this.y2, dataArea, rangeEdge);
g2.setPaint(this.paint);
g2.setStroke(this.stroke);
Line2D line = new Line2D.Float(j2DX1, j2DY1, j2DX2, j2DY2);
g2.draw(line);
}
/**
* Tests this annotation for equality with an object.
*
* @param object the object to test against.
*
* @return true or false.
*/
public boolean equals(Object object) {
if (object == null) {
return false;
}
if (object == this) {
return true;
}
if (object instanceof XYLineAnnotation) {
XYLineAnnotation a = (XYLineAnnotation) object;
boolean b0 = (this.x1 == a.x1);
boolean b1 = (this.y1 == a.y1);
boolean b2 = (this.x2 == a.x2);
boolean b3 = (this.y2 == a.y2);
boolean b4 = ObjectUtils.equal(this.paint, a.paint);
boolean b5 = ObjectUtils.equal(this.stroke, a.stroke);
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();
}
/**
* 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.writePaint(this.paint, stream);
SerialUtilities.writeStroke(this.stroke, 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.paint = SerialUtilities.readPaint(stream);
this.stroke = SerialUtilities.readStroke(stream);
}
}