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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.

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/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 * 
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 * 
 * -----------------
 * TextMeasurer.java
 * -----------------
 * (C) Copyright 2004, 2005, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: TextMeasurer.java,v 1.4 2005/10/18 13:17:16 mungady Exp $
 *
 * Changes
 * -------
 * 07-Jan-2004 : Version 1 (DG);
 *
 */

package org.jfree.text;

/**
 * An object that can measure text.
 *
 * @author David Gilbert
 */
public interface TextMeasurer {

    /**
     * Calculates the width of a String in the current 
     * Graphics context.
     *
     * @param text  the text.
     * @param start  the start position of the substring to be measured.
     * @param end  the position of the last character to be measured.
     *
     * @return The width of the string in Java2D units.
     */
    public float getStringWidth(String text, int start, int end);
    
}