    001    /* ===========================================================
    002     * JFreeChart : a free chart library for the Java(tm) platform
    003     * ===========================================================
    004     *
    005     * (C) Copyright 2000-2007, 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     * LineBorder.java
    029     * ---------------
    030     * (C) Copyright 2007, by Christo Zietsman and Contributors.
    031     *
    032     * Original Author:  Christo Zietsman;
    033     * Contributor(s):   David Gilbert (for Object Refinery Limited);
    034     *
    035     * Changes:
    036     * --------
    037     * 16-Mar-2007 : Version 1, contributed by Christo Zietsman with
    038     *               modifications by DG (DG);
    039     * 13-Jun-2007 : Don't draw if area doesn't have positive dimensions (DG);
    040     *
    041     */
    042
    043    package org.jfree.chart.block;
    044
    045    import java.awt.BasicStroke;
    046    import java.awt.Color;
    047    import java.awt.Graphics2D;
    048    import java.awt.Paint;
    049    import java.awt.Stroke;
    050    import java.awt.geom.Line2D;
    051    import java.awt.geom.Rectangle2D;
    052    import java.io.IOException;
    053    import java.io.ObjectInputStream;
    054    import java.io.ObjectOutputStream;
    055    import java.io.Serializable;
    056
    057    import org.jfree.io.SerialUtilities;
    058    import org.jfree.ui.RectangleInsets;
    059    import org.jfree.util.ObjectUtilities;
    060    import org.jfree.util.PaintUtilities;
    061
    062    /**
    063     * A line border for any {@link AbstractBlock}.
    064     *
    065     * @since 1.0.5
    066     */
    067    public class LineBorder implements BlockFrame, Serializable {
    068
    069        /** For serialization. */
    070        static final long serialVersionUID = 4630356736707233924L;
    071
    072        /** The line color. */
    073        private transient Paint paint;
    074
    075        /** The line stroke. */
    076        private transient Stroke stroke;
    077
    078        /** The insets. */
    079        private RectangleInsets insets;
    080
    081        /**
    082         * Creates a default border.
    083         */
    084        public LineBorder() {
    085            this(Color.black, new BasicStroke(1.0f), new RectangleInsets(1.0, 1.0,
    086                    1.0, 1.0));
    087        }
    088
    089        /**
    090         * Creates a new border with the specified color.
    091         *
    092         * @param paint  the color (<code>null</code> not permitted).
    093         * @param stroke  the border stroke (<code>null</code> not permitted).
    094         * @param insets  the insets (<code>null</code> not permitted).
    095         */
    096        public LineBorder(Paint paint, Stroke stroke, RectangleInsets insets) {
    097            if (paint == null) {
    098                throw new IllegalArgumentException("Null 'paint' argument.");
    099            }
    100            if (stroke == null) {
    101                throw new IllegalArgumentException("Null 'stroke' argument.");
    102            }
    103            if (insets == null) {
    104                throw new IllegalArgumentException("Null 'insets' argument.");
    105            }
    106            this.paint = paint;
    107            this.stroke = stroke;
    108            this.insets = insets;
    109        }
    110
    111        /**
    112         * Returns the paint.
    113         *
    114         * @return The paint (never <code>null</code>).
    115         */
    116        public Paint getPaint() {
    117            return this.paint;
    118        }
    119
    120        /**
    121         * Returns the insets.
    122         *
    123         * @return The insets (never <code>null</code>).
    124         */
    125        public RectangleInsets getInsets() {
    126            return this.insets;
    127        }
    128
    129        /**
    130         * Returns the stroke.
    131         *
    132         * @return The stroke (never <code>null</code>).
    133         */
    134        public Stroke getStroke() {
    135            return this.stroke;
    136        }
    137
    138        /**
    139         * Draws the border by filling in the reserved space (in black).
    140         *
    141         * @param g2  the graphics device.
    142         * @param area  the area.
    143         */
    144        public void draw(Graphics2D g2, Rectangle2D area) {
    145            double w = area.getWidth();
    146            double h = area.getHeight();
    147            // if the area has zero height or width, we shouldn't draw anything
    148            if (w <= 0.0 || h <= 0.0) {
    149                return;
    150            }
    151            double t = this.insets.calculateTopInset(h);
    152            double b = this.insets.calculateBottomInset(h);
    153            double l = this.insets.calculateLeftInset(w);
    154            double r = this.insets.calculateRightInset(w);
    155            double x = area.getX();
    156            double y = area.getY();
    157            double x0 = x + l / 2.0;
    158            double x1 = x + w - r / 2.0;
    159            double y0 = y + h - b / 2.0;
    160            double y1 = y + t / 2.0;
    161            g2.setPaint(getPaint());
    162            g2.setStroke(getStroke());
    163            Line2D line = new Line2D.Double();
    164            if (t > 0.0) {
    165                line.setLine(x0, y1, x1, y1);
    166                g2.draw(line);
    167            }
    168            if (b > 0.0) {
    169                line.setLine(x0, y0, x1, y0);
    170                g2.draw(line);
    171            }
    172            if (l > 0.0) {
    173                line.setLine(x0, y0, x0, y1);
    174                g2.draw(line);
    175            }
    176            if (r > 0.0) {
    177                line.setLine(x1, y0, x1, y1);
    178                g2.draw(line);
    179            }
    180        }
    181
    182        /**
    183         * Tests this border for equality with an arbitrary instance.
    184         *
    185         * @param obj  the object (<code>null</code> permitted).
    186         *
    187         * @return A boolean.
    188         */
    189        public boolean equals(Object obj) {
    190            if (obj == this) {
    191                return true;
    192            }
    193            if (!(obj instanceof LineBorder)) {
    194                return false;
    195            }
    196            LineBorder that = (LineBorder) obj;
    197            if (!PaintUtilities.equal(this.paint, that.paint)) {
    198                return false;
    199            }
    200            if (!ObjectUtilities.equal(this.stroke, that.stroke)) {
    201                return false;
    202            }
    203            if (!this.insets.equals(that.insets)) {
    204                return false;
    205            }
    206            return true;
    207        }
    208
    209        /**
    210         * Provides serialization support.
    211         *
    212         * @param stream  the output stream.
    213         *
    214         * @throws IOException  if there is an I/O error.
    215         */
    216        private void writeObject(ObjectOutputStream stream) throws IOException {
    217            stream.defaultWriteObject();
    218            SerialUtilities.writePaint(this.paint, stream);
    219            SerialUtilities.writeStroke(this.stroke, stream);
    220        }
    221
    222        /**
    223         * Provides serialization support.
    224         *
    225         * @param stream  the input stream.
    226         *
    227         * @throws IOException  if there is an I/O error.
    228         * @throws ClassNotFoundException  if there is a classpath problem.
    229         */
    230        private void readObject(ObjectInputStream stream)
    231            throws IOException, ClassNotFoundException {
    232            stream.defaultReadObject();
    233            this.paint = SerialUtilities.readPaint(stream);
    234            this.stroke = SerialUtilities.readStroke(stream);
    235        }
    236    }
    237
    238