    001/* ========================================================================
    002 * JCommon : a free general purpose class 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/jcommon/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 * ArrowPanel.java
    029 * ---------------
    030 * (C) Copyright 2002-2004, by Object Refinery Limited.
    031 *
    032 * Original Author:  David Gilbert (for Object Refinery Limited);
    033 * Contributor(s):   -;
    034 *
    035 * $Id: ArrowPanel.java,v 1.6 2007/11/02 17:50:36 taqua Exp $
    036 *
    037 * Changes
    038 * -------
    039 * 25-Sep-2002 : Version 1 (DG);
    040 * 13-Oct-2002 : Added Javadocs (DG);
    041 *
    042 */
    043
    044package org.jfree.ui;
    045
    046import java.awt.Dimension;
    047import java.awt.Graphics;
    048import java.awt.Graphics2D;
    049import java.awt.Insets;
    050import java.awt.Polygon;
    051import java.awt.Shape;
    052import java.awt.geom.Rectangle2D;
    053import javax.swing.JPanel;
    054
    055/**
    056 * A basic panel that displays a small up or down arrow.
    057 *
    058 * @author David Gilbert
    059 */
    060public class ArrowPanel extends JPanel {
    061
    062    /** A constant for the up arrow. */
    063    public static final int UP = 0;
    064
    065    /** A constant for the down arrow. */
    066    public static final int DOWN = 1;
    067
    068    /** The arrow type. */
    069    private int type = UP;
    070
    071    /** The available area. */
    072    private Rectangle2D available = new Rectangle2D.Float();
    073
    074    /**
    075     * Creates a new arrow panel.
    076     *
    077     * @param type  the arrow type.
    078     */
    079    public ArrowPanel(final int type) {
    080        this.type = type;
    081        setPreferredSize(new Dimension(14, 9));
    082    }
    083
    084    /**
    085     * Paints the arrow panel.
    086     *
    087     * @param g  the graphics device for drawing on.
    088     */
    089    public void paintComponent(final Graphics g) {
    090
    091        super.paintComponent(g);
    092        final Graphics2D g2 = (Graphics2D) g;
    093
    094        // first determine the size of the drawing area...
    095        final Dimension size = getSize();
    096        final Insets insets = getInsets();
    097        this.available.setRect(insets.left, insets.top,
    098                               size.getWidth() - insets.left - insets.right,
    099                               size.getHeight() - insets.top - insets.bottom);
    100        g2.translate(insets.left, insets.top);
    101        g2.fill(getArrow(this.type));
    102
    103    }
    104
    105    /**
    106     * Returns a shape for the arrow.
    107     *
    108     * @param t  the arrow type.
    109     *
    110     * @return the arrow shape.
    111     */
    112    private Shape getArrow(final int t) {
    113        switch (t) {
    114            case UP : return getUpArrow();
    115            case DOWN : return getDownArrow();
    116            default : return getUpArrow();
    117        }
    118    }
    119
    120    /**
    121     * Returns an up arrow.
    122     *
    123     * @return an up arrow.
    124     */
    125    private Shape getUpArrow() {
    126        final Polygon result = new Polygon();
    127        result.addPoint(7, 2);
    128        result.addPoint(2, 7);
    129        result.addPoint(12, 7);
    130        return result;
    131    }
    132
    133    /**
    134     * Returns a down arrow.
    135     *
    136     * @return a down arrow.
    137     */
    138    private Shape getDownArrow() {
    139        final Polygon result = new Polygon();
    140        result.addPoint(7, 7);
    141        result.addPoint(2, 2);
    142        result.addPoint(12, 2);
    143        return result;
    144    }
    145
    146}