001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006     *
007     * Project Info:  http://www.jfree.org/jfreechart/index.html
008     *
009     * This library is free software; you can redistribute it and/or modify it 
010     * under the terms of the GNU Lesser General Public License as published by 
011     * the Free Software Foundation; either version 2.1 of the License, or 
012     * (at your option) any later version.
013     *
014     * This library is distributed in the hope that it will be useful, but 
015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
017     * License for more details.
018     *
019     * You should have received a copy of the GNU Lesser General Public
020     * License along with this library; if not, write to the Free Software
021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
022     * USA.  
023     *
024     * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
025     * in the United States and other countries.]
026     *
027     * ---------------------
028     * XYLineAnnotation.java
029     * ---------------------
030     * (C) Copyright 2003-2005, by Object Refinery Limited.
031     *
032     * Original Author:  David Gilbert (for Object Refinery Limited);
033     * Contributor(s):   -;
034     *
035     * $Id: XYLineAnnotation.java,v 1.7.2.2 2005/10/25 16:51:15 mungady Exp $
036     *
037     * Changes:
038     * --------
039     * 02-Apr-2003 : Version 1 (DG);
040     * 19-Aug-2003 : Added equals method, implemented Cloneable, and applied 
041     *               serialization fixes (DG);
042     * 21-Jan-2004 : Update for renamed method in ValueAxis (DG);
043     * 14-Apr-2004 : Fixed draw() method to handle plot orientation correctly (DG);
044     * 29-Sep-2004 : Added support for tool tips and URLS, now extends 
045     *               AbstractXYAnnotation (DG);
046     * 04-Oct-2004 : Renamed ShapeUtils --> ShapeUtilities (DG);
047     * 08-Jun-2005 : Fixed equals() method to handle GradientPaint() (DG);
048     * 
049     */
050    
051    package org.jfree.chart.annotations;
052    
053    import java.awt.BasicStroke;
054    import java.awt.Color;
055    import java.awt.Graphics2D;
056    import java.awt.Paint;
057    import java.awt.Stroke;
058    import java.awt.geom.Line2D;
059    import java.awt.geom.Rectangle2D;
060    import java.io.IOException;
061    import java.io.ObjectInputStream;
062    import java.io.ObjectOutputStream;
063    import java.io.Serializable;
064    
065    import org.jfree.chart.axis.ValueAxis;
066    import org.jfree.chart.plot.Plot;
067    import org.jfree.chart.plot.PlotOrientation;
068    import org.jfree.chart.plot.PlotRenderingInfo;
069    import org.jfree.chart.plot.XYPlot;
070    import org.jfree.io.SerialUtilities;
071    import org.jfree.ui.RectangleEdge;
072    import org.jfree.util.ObjectUtilities;
073    import org.jfree.util.PaintUtilities;
074    import org.jfree.util.PublicCloneable;
075    import org.jfree.util.ShapeUtilities;
076    
077    /**
078     * A simple line annotation that can be placed on an {@link XYPlot}.
079     */
080    public class XYLineAnnotation extends AbstractXYAnnotation
081                                  implements Cloneable, PublicCloneable, 
082                                             Serializable {
083    
084        /** For serialization. */
085        private static final long serialVersionUID = -80535465244091334L;
086        
087        /** The x-coordinate. */
088        private double x1;
089    
090        /** The y-coordinate. */
091        private double y1;
092    
093        /** The x-coordinate. */
094        private double x2;
095    
096        /** The y-coordinate. */
097        private double y2;
098    
099        /** The line stroke. */
100        private transient Stroke stroke;
101    
102        /** The line color. */
103        private transient Paint paint;
104    
105        /**
106         * Creates a new annotation that draws a line from (x1, y1) to (x2, y2) 
107         * where the coordinates are measured in data space (that is, against the 
108         * plot's axes).
109         * 
110         * @param x1  the x-coordinate for the start of the line.
111         * @param y1  the y-coordinate for the start of the line.
112         * @param x2  the x-coordinate for the end of the line.
113         * @param y2  the y-coordinate for the end of the line.
114         */
115        public XYLineAnnotation(double x1, double y1, double x2, double y2) {
116            this(x1, y1, x2, y2, new BasicStroke(1.0f), Color.black);
117        }
118        
119        /**
120         * Creates a new annotation that draws a line from (x1, y1) to (x2, y2) 
121         * where the coordinates are measured in data space (that is, against the 
122         * plot's axes).
123         *
124         * @param x1  the x-coordinate for the start of the line.
125         * @param y1  the y-coordinate for the start of the line.
126         * @param x2  the x-coordinate for the end of the line.
127         * @param y2  the y-coordinate for the end of the line.
128         * @param stroke  the line stroke (<code>null</code> not permitted).
129         * @param paint  the line color (<code>null</code> not permitted).
130         */
131        public XYLineAnnotation(double x1, double y1, double x2, double y2,
132                                Stroke stroke, Paint paint) {
133    
134            if (stroke == null) {
135                throw new IllegalArgumentException("Null 'stroke' argument.");   
136            }
137            if (paint == null) {
138                throw new IllegalArgumentException("Null 'paint' argument.");   
139            }
140            this.x1 = x1;
141            this.y1 = y1;
142            this.x2 = x2;
143            this.y2 = y2;
144            this.stroke = stroke;
145            this.paint = paint;
146    
147        }
148    
149        /**
150         * Draws the annotation.  This method is called by the {@link XYPlot} 
151         * class, you won't normally need to call it yourself.
152         *
153         * @param g2  the graphics device.
154         * @param plot  the plot.
155         * @param dataArea  the data area.
156         * @param domainAxis  the domain axis.
157         * @param rangeAxis  the range axis.
158         * @param rendererIndex  the renderer index.
159         * @param info  if supplied, this info object will be populated with
160         *              entity information.
161         */
162        public void draw(Graphics2D g2, XYPlot plot, Rectangle2D dataArea,
163                         ValueAxis domainAxis, ValueAxis rangeAxis, 
164                         int rendererIndex,
165                         PlotRenderingInfo info) {
166    
167            PlotOrientation orientation = plot.getOrientation();
168            RectangleEdge domainEdge = Plot.resolveDomainAxisLocation(
169                plot.getDomainAxisLocation(), orientation
170            );
171            RectangleEdge rangeEdge = Plot.resolveRangeAxisLocation(
172                plot.getRangeAxisLocation(), orientation
173            );
174            float j2DX1 = 0.0f;
175            float j2DX2 = 0.0f;
176            float j2DY1 = 0.0f;
177            float j2DY2 = 0.0f;
178            if (orientation == PlotOrientation.VERTICAL) {
179                j2DX1 = (float) domainAxis.valueToJava2D(
180                    this.x1, dataArea, domainEdge
181                );
182                j2DY1 = (float) rangeAxis.valueToJava2D(
183                    this.y1, dataArea, rangeEdge
184                );
185                j2DX2 = (float) domainAxis.valueToJava2D(
186                    this.x2, dataArea, domainEdge
187                );
188                j2DY2 = (float) rangeAxis.valueToJava2D(
189                    this.y2, dataArea, rangeEdge
190                );
191            }
192            else if (orientation == PlotOrientation.HORIZONTAL) {
193                j2DY1 = (float) domainAxis.valueToJava2D(
194                    this.x1, dataArea, domainEdge
195                );
196                j2DX1 = (float) rangeAxis.valueToJava2D(
197                    this.y1, dataArea, rangeEdge
198                );
199                j2DY2 = (float) domainAxis.valueToJava2D(
200                    this.x2, dataArea, domainEdge
201                );
202                j2DX2 = (float) rangeAxis.valueToJava2D(
203                    this.y2, dataArea, rangeEdge
204                );                
205            }
206            g2.setPaint(this.paint);
207            g2.setStroke(this.stroke);
208            Line2D line = new Line2D.Float(j2DX1, j2DY1, j2DX2, j2DY2);
209            g2.draw(line);
210    
211            String toolTip = getToolTipText();
212            String url = getURL();
213            if (toolTip != null || url != null) {
214                addEntity(
215                    info, ShapeUtilities.createLineRegion(line, 1.0f), 
216                    rendererIndex, toolTip, url
217                );
218            }
219        }
220    
221        /**
222         * Tests this object for equality with an arbitrary object.
223         * 
224         * @param obj  the object to test against (<code>null</code> permitted).
225         * 
226         * @return <code>true</code> or <code>false</code>.
227         */
228        public boolean equals(Object obj) {
229            if (obj == this) {
230                return true;
231            }
232            if (!super.equals(obj)) {
233                return false;
234            }
235            if (!(obj instanceof XYLineAnnotation)) {
236                return false;
237            }
238            XYLineAnnotation that = (XYLineAnnotation) obj;
239            if (this.x1 != that.x1) {
240                return false;
241            }
242            if (this.y1 != that.y1) {
243                return false;
244            }
245            if (this.x2 != that.x2) {
246                return false;
247            }
248            if (this.y2 != that.y2) {
249                return false;
250            }
251            if (!PaintUtilities.equal(this.paint, that.paint)) {
252                return false;
253            }
254            if (!ObjectUtilities.equal(this.stroke, that.stroke)) {
255                return false;
256            }
257            // seems to be the same...
258            return true;
259        }
260        
261        /**
262         * Returns a hash code.
263         * 
264         * @return A hash code.
265         */
266        public int hashCode() {
267            int result;
268            long temp;
269            temp = Double.doubleToLongBits(this.x1);
270            result = (int) (temp ^ (temp >>> 32));
271            temp = Double.doubleToLongBits(this.x2);
272            result = 29 * result + (int) (temp ^ (temp >>> 32));
273            temp = Double.doubleToLongBits(this.y1);
274            result = 29 * result + (int) (temp ^ (temp >>> 32));
275            temp = Double.doubleToLongBits(this.y2);
276            result = 29 * result + (int) (temp ^ (temp >>> 32));
277            return result;
278        }
279    
280        /**
281         * Returns a clone of the annotation.
282         * 
283         * @return A clone.
284         * 
285         * @throws CloneNotSupportedException  if the annotation can't be cloned.
286         */
287        public Object clone() throws CloneNotSupportedException {
288            return super.clone();
289        }
290        
291        /**
292         * Provides serialization support.
293         *
294         * @param stream  the output stream.
295         *
296         * @throws IOException  if there is an I/O error.
297         */
298        private void writeObject(ObjectOutputStream stream) throws IOException {
299    
300            stream.defaultWriteObject();
301            SerialUtilities.writePaint(this.paint, stream);
302            SerialUtilities.writeStroke(this.stroke, stream);
303    
304        }
305    
306        /**
307         * Provides serialization support.
308         *
309         * @param stream  the input stream.
310         *
311         * @throws IOException  if there is an I/O error.
312         * @throws ClassNotFoundException  if there is a classpath problem.
313         */
314        private void readObject(ObjectInputStream stream) 
315            throws IOException, ClassNotFoundException {
316            stream.defaultReadObject();
317            this.paint = SerialUtilities.readPaint(stream);
318            this.stroke = SerialUtilities.readStroke(stream);
319        }
320    
321    }