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 * StrokeSample.java 029 * ----------------- 030 * (C) Copyright 2000-2004, by Object Refinery Limited. 031 * 032 * Original Author: David Gilbert (for Object Refinery Limited); 033 * Contributor(s): -; 034 * 035 * $Id: StrokeSample.java,v 1.3 2005/10/18 13:18:34 mungady Exp $ 036 * 037 * Changes (from 26-Oct-2001) 038 * -------------------------- 039 * 26-Oct-2001 : Changed package to com.jrefinery.ui.*; 040 * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG); 041 * 21-Mar-2003 : Fixed null pointer exception, bug 705126 (DG); 042 * 043 */ 044 045 package org.jfree.ui; 046 047 import java.awt.BasicStroke; 048 import java.awt.Component; 049 import java.awt.Dimension; 050 import java.awt.Graphics; 051 import java.awt.Graphics2D; 052 import java.awt.Insets; 053 import java.awt.RenderingHints; 054 import java.awt.Stroke; 055 import java.awt.geom.Ellipse2D; 056 import java.awt.geom.Line2D; 057 import java.awt.geom.Point2D; 058 059 import javax.swing.JComponent; 060 import javax.swing.JList; 061 import javax.swing.ListCellRenderer; 062 063 /** 064 * A panel that displays a stroke sample. 065 * 066 * @author David Gilbert 067 */ 068 public class StrokeSample extends JComponent implements ListCellRenderer { 069 070 /** The stroke being displayed. */ 071 private Stroke stroke; 072 073 /** The preferred size of the component. */ 074 private Dimension preferredSize; 075 076 /** 077 * Creates a StrokeSample for the specified stroke. 078 * 079 * @param stroke the sample stroke. 080 */ 081 public StrokeSample(final Stroke stroke) { 082 this.stroke = stroke; 083 this.preferredSize = new Dimension(80, 18); 084 } 085 086 /** 087 * Returns the current Stroke object being displayed. 088 * 089 * @return the stroke. 090 */ 091 public Stroke getStroke() { 092 return this.stroke; 093 } 094 095 /** 096 * Sets the Stroke object being displayed. 097 * 098 * @param stroke the stroke. 099 */ 100 public void setStroke(final Stroke stroke) { 101 this.stroke = stroke; 102 repaint(); 103 } 104 105 /** 106 * Returns the preferred size of the component. 107 * 108 * @return the preferred size of the component. 109 */ 110 public Dimension getPreferredSize() { 111 return this.preferredSize; 112 } 113 114 /** 115 * Draws a line using the sample stroke. 116 * 117 * @param g the graphics device. 118 */ 119 public void paintComponent(final Graphics g) { 120 121 final Graphics2D g2 = (Graphics2D) g; 122 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); 123 final Dimension size = getSize(); 124 final Insets insets = getInsets(); 125 final double xx = insets.left; 126 final double yy = insets.top; 127 final double ww = size.getWidth() - insets.left - insets.right; 128 final double hh = size.getHeight() - insets.top - insets.bottom; 129 130 // calculate point one 131 final Point2D one = new Point2D.Double(xx + 6, yy + hh / 2); 132 // calculate point two 133 final Point2D two = new Point2D.Double(xx + ww - 6, yy + hh / 2); 134 // draw a circle at point one 135 final Ellipse2D circle1 = new Ellipse2D.Double(one.getX() - 5, one.getY() - 5, 10, 10); 136 final Ellipse2D circle2 = new Ellipse2D.Double(two.getX() - 6, two.getY() - 5, 10, 10); 137 138 // draw a circle at point two 139 g2.draw(circle1); 140 g2.fill(circle1); 141 g2.draw(circle2); 142 g2.fill(circle2); 143 144 // draw a line connecting the points 145 final Line2D line = new Line2D.Double(one, two); 146 if (this.stroke != null) { 147 g2.setStroke(this.stroke); 148 } 149 else { 150 g2.setStroke(new BasicStroke(0.0f)); 151 } 152 g2.draw(line); 153 154 } 155 156 /** 157 * Returns a list cell renderer for the stroke, so the sample can be displayed in a list or 158 * combo. 159 * 160 * @param list the list. 161 * @param value the value. 162 * @param index the index. 163 * @param isSelected selected? 164 * @param cellHasFocus focussed? 165 * 166 * @return the component for rendering. 167 */ 168 public Component getListCellRendererComponent(final JList list, final Object value, final int index, 169 final boolean isSelected, final boolean cellHasFocus) { 170 if (value instanceof StrokeSample) { 171 final StrokeSample in = (StrokeSample) value; 172 setStroke(in.getStroke()); 173 } 174 return this; 175 } 176 177 }