    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