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 1.5 2005/11/16 15:58:41 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; 053 054import javax.swing.JPanel; 055 056/** 057 * A basic panel that displays a small up or down arrow. 058 * 059 * @author David Gilbert 060 */ 061public class ArrowPanel extends JPanel { 062 063 /** A constant for the up arrow. */ 064 public static final int UP = 0; 065 066 /** A constant for the down arrow. */ 067 public static final int DOWN = 1; 068 069 /** The arrow type. */ 070 private int type = UP; 071 072 /** The available area. */ 073 private Rectangle2D available = new Rectangle2D.Float(); 074 075 /** 076 * Creates a new arrow panel. 077 * 078 * @param type the arrow type. 079 */ 080 public ArrowPanel(final int type) { 081 this.type = type; 082 setPreferredSize(new Dimension(14, 9)); 083 } 084 085 /** 086 * Paints the arrow panel. 087 * 088 * @param g the graphics device for drawing on. 089 */ 090 public void paintComponent(final Graphics g) { 091 092 super.paintComponent(g); 093 final Graphics2D g2 = (Graphics2D) g; 094 095 // first determine the size of the drawing area... 096 final Dimension size = getSize(); 097 final Insets insets = getInsets(); 098 this.available.setRect(insets.left, insets.top, 099 size.getWidth() - insets.left - insets.right, 100 size.getHeight() - insets.top - insets.bottom); 101 g2.translate(insets.left, insets.top); 102 g2.fill(getArrow(this.type)); 103 104 } 105 106 /** 107 * Returns a shape for the arrow. 108 * 109 * @param t the arrow type. 110 * 111 * @return the arrow shape. 112 */ 113 private Shape getArrow(final int t) { 114 switch (t) { 115 case UP : return getUpArrow(); 116 case DOWN : return getDownArrow(); 117 default : return getUpArrow(); 118 } 119 } 120 121 /** 122 * Returns an up arrow. 123 * 124 * @return an up arrow. 125 */ 126 private Shape getUpArrow() { 127 final Polygon result = new Polygon(); 128 result.addPoint(7, 2); 129 result.addPoint(2, 7); 130 result.addPoint(12, 7); 131 return result; 132 } 133 134 /** 135 * Returns a down arrow. 136 * 137 * @return a down arrow. 138 */ 139 private Shape getDownArrow() { 140 final Polygon result = new Polygon(); 141 result.addPoint(7, 7); 142 result.addPoint(2, 2); 143 result.addPoint(12, 2); 144 return result; 145 } 146 147}