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 * G2TextMeasurer.java
029 * -------------------
030 * (C) Copyright 2004, 2005, by Object Refinery Limited and Contributors.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * $Id: G2TextMeasurer.java,v 1.4 2005/10/18 13:17:16 mungady Exp $
036 *
037 * Changes
038 * -------
039 * 07-Jan-2004 : Version 1 (DG);
040 *
041 */
042
043 package org.jfree.text;
044
045 import java.awt.FontMetrics;
046 import java.awt.Graphics2D;
047 import java.awt.geom.Rectangle2D;
048
049 /**
050 * A {@link TextMeasurer} based on a {@link Graphics2D}.
051 *
052 * @author David Gilbert
053 */
054 public class G2TextMeasurer implements TextMeasurer {
055
056 /** The graphics device. */
057 private Graphics2D g2;
058
059 /**
060 * Creates a new text measurer.
061 *
062 * @param g2 the graphics device.
063 */
064 public G2TextMeasurer(final Graphics2D g2) {
065 this.g2 = g2;
066 }
067
068 /**
069 * Returns the string width.
070 *
071 * @param text the text.
072 * @param start the index of the first character to measure.
073 * @param end the index of the last character to measure.
074 *
075 * @return The string width.
076 */
077 public float getStringWidth(final String text,
078 final int start, final int end) {
079 final FontMetrics fm = this.g2.getFontMetrics();
080 final Rectangle2D bounds = TextUtilities.getTextBounds(
081 text.substring(start, end), this.g2, fm
082 );
083 final float result = (float) bounds.getWidth();
084 return result;
085 }
086
087 }
088