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1: /* ======================================================================== 2: * JCommon : a free general purpose class library for the Java(tm) platform 3: * ======================================================================== 4: * 5: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jcommon/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * ----------------- 28: * StrokeSample.java 29: * ----------------- 30: * (C) Copyright 2000-2004, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * $Id: StrokeSample.java,v 1.3 2005/10/18 13:18:34 mungady Exp $ 36: * 37: * Changes (from 26-Oct-2001) 38: * -------------------------- 39: * 26-Oct-2001 : Changed package to com.jrefinery.ui.*; 40: * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG); 41: * 21-Mar-2003 : Fixed null pointer exception, bug 705126 (DG); 42: * 43: */ 44: 45: package org.jfree.ui; 46: 47: import java.awt.BasicStroke; 48: import java.awt.Component; 49: import java.awt.Dimension; 50: import java.awt.Graphics; 51: import java.awt.Graphics2D; 52: import java.awt.Insets; 53: import java.awt.RenderingHints; 54: import java.awt.Stroke; 55: import java.awt.geom.Ellipse2D; 56: import java.awt.geom.Line2D; 57: import java.awt.geom.Point2D; 58: 59: import javax.swing.JComponent; 60: import javax.swing.JList; 61: import javax.swing.ListCellRenderer; 62: 63: /** 64: * A panel that displays a stroke sample. 65: * 66: * @author David Gilbert 67: */ 68: public class StrokeSample extends JComponent implements ListCellRenderer { 69: 70: /** The stroke being displayed. */ 71: private Stroke stroke; 72: 73: /** The preferred size of the component. */ 74: private Dimension preferredSize; 75: 76: /** 77: * Creates a StrokeSample for the specified stroke. 78: * 79: * @param stroke the sample stroke. 80: */ 81: public StrokeSample(final Stroke stroke) { 82: this.stroke = stroke; 83: this.preferredSize = new Dimension(80, 18); 84: } 85: 86: /** 87: * Returns the current Stroke object being displayed. 88: * 89: * @return the stroke. 90: */ 91: public Stroke getStroke() { 92: return this.stroke; 93: } 94: 95: /** 96: * Sets the Stroke object being displayed. 97: * 98: * @param stroke the stroke. 99: */ 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: }