001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-present, by David Gilbert and Contributors.
006 *
007 * Project Info:  http://www.jfree.org/jfreechart/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 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025 * Other names may be trademarks of their respective owners.]
026 *
027 */
028
029package org.jfree.chart.text;
030
031import java.awt.FontMetrics;
032import java.awt.Graphics2D;
033import java.awt.geom.Rectangle2D;
034
035/**
036 * A {@link TextMeasurer} based on a {@link Graphics2D}.
037 */
038public class G2TextMeasurer implements TextMeasurer {
039
040    /** The graphics device. */
041    private Graphics2D g2;
042    
043    /**
044     * Creates a new text measurer.
045     * 
046     * @param g2  the graphics device.
047     */
048    public G2TextMeasurer(Graphics2D g2) {
049        this.g2 = g2;
050    }
051
052    /**
053     * Returns the string width.
054     * 
055     * @param text  the text.
056     * @param start  the index of the first character to measure.
057     * @param end  the index of the last character to measure.
058     * 
059     * @return The string width.
060     */
061    @Override
062    public float getStringWidth(String text, int start, int end) {
063        FontMetrics fm = this.g2.getFontMetrics();
064        Rectangle2D bounds = TextUtils.getTextBounds(text.substring(start, end),
065                this.g2, fm);
066        float result = (float) bounds.getWidth();
067        return result;
068    }
069    
070}
071