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1: /* ======================================================================== 2: * JCommon : a free general purpose class library for the Java(tm) platform 3: * ======================================================================== 4: * 5: * (C) Copyright 2000-2009, 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 2000-2009, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * $Id: StrokeSample.java,v 1.5 2009/02/27 13:58:41 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.Component; 48: import java.awt.Dimension; 49: import java.awt.Graphics; 50: import java.awt.Graphics2D; 51: import java.awt.Insets; 52: import java.awt.RenderingHints; 53: import java.awt.Stroke; 54: import java.awt.geom.Ellipse2D; 55: import java.awt.geom.Line2D; 56: import java.awt.geom.Point2D; 57: import javax.swing.JComponent; 58: import javax.swing.JList; 59: import javax.swing.ListCellRenderer; 60: 61: /** 62: * A panel that displays a stroke sample. 63: * 64: * @author David Gilbert 65: */ 66: public class StrokeSample extends JComponent implements ListCellRenderer { 67: 68: /** The stroke being displayed (may be null). */ 69: private Stroke stroke; 70: 71: /** The preferred size of the component. */ 72: private Dimension preferredSize; 73: 74: /** 75: * Creates a StrokeSample for the specified stroke. 76: * 77: * @param stroke the sample stroke (<code>null</code> permitted). 78: */ 79: public StrokeSample(final Stroke stroke) { 80: this.stroke = stroke; 81: this.preferredSize = new Dimension(80, 18); 82: setPreferredSize(this.preferredSize); 83: } 84: 85: /** 86: * Returns the current Stroke object being displayed. 87: * 88: * @return The stroke (possibly <code>null</code>). 89: */ 90: public Stroke getStroke() { 91: return this.stroke; 92: } 93: 94: /** 95: * Sets the stroke object being displayed and repaints the component. 96: * 97: * @param stroke the stroke (<code>null</code> permitted). 98: */ 99: public void setStroke(final Stroke stroke) { 100: this.stroke = stroke; 101: repaint(); 102: } 103: 104: /** 105: * Returns the preferred size of the component. 106: * 107: * @return the preferred size of the component. 108: */ 109: public Dimension getPreferredSize() { 110: return this.preferredSize; 111: } 112: 113: /** 114: * Draws a line using the sample stroke. 115: * 116: * @param g the graphics device. 117: */ 118: public void paintComponent(final Graphics g) { 119: 120: final Graphics2D g2 = (Graphics2D) g; 121: g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 122: 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, 136: one.getY() - 5, 10, 10); 137: final Ellipse2D circle2 = new Ellipse2D.Double(two.getX() - 6, 138: two.getY() - 5, 10, 10); 139: 140: // draw a circle at point two 141: g2.draw(circle1); 142: g2.fill(circle1); 143: g2.draw(circle2); 144: g2.fill(circle2); 145: 146: // draw a line connecting the points 147: final Line2D line = new Line2D.Double(one, two); 148: if (this.stroke != null) { 149: g2.setStroke(this.stroke); 150: g2.draw(line); 151: } 152: 153: } 154: 155: /** 156: * Returns a list cell renderer for the stroke, so the sample can be 157: * displayed in a list or combo. 158: * 159: * @param list the list. 160: * @param value the value. 161: * @param index the index. 162: * @param isSelected selected? 163: * @param cellHasFocus focussed? 164: * 165: * @return the component for rendering. 166: */ 167: public Component getListCellRendererComponent(JList list, Object value, 168: int index, boolean isSelected, boolean cellHasFocus) { 169: if (value instanceof Stroke) { 170: setStroke((Stroke) value); 171: } 172: else { 173: setStroke(null); 174: } 175: return this; 176: } 177: 178: }