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jtstand-common is a library derived from jcommon, used by jtstand-chart, which is derived from jfreechart

There is a newer version: 1.5.9

/*
 * Copyright (c) 2009 Albert Kurucz. 
 *
 * This file, G2TextMeasurer.java is part of JTStand.
 *
 * JTStand 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 3 of the License, or
 * (at your option) any later version.
 *
 * JTStand 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 GTStand.  If not, see .
 */
 
package org.jfree.text;

import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;

/**
 * A {@link TextMeasurer} based on a {@link Graphics2D}.
 *
 * @author David Gilbert
 */
public class G2TextMeasurer implements TextMeasurer {

    /** The graphics device. */
    private Graphics2D g2;
    
    /**
     * Creates a new text measurer.
     * 
     * @param g2  the graphics device.
     */
    public G2TextMeasurer(final Graphics2D g2) {
        this.g2 = g2;
    }

    /**
     * Returns the string width.
     * 
     * @param text  the text.
     * @param start  the index of the first character to measure.
     * @param end  the index of the last character to measure.
     * 
     * @return The string width.
     */
    public float getStringWidth(final String text, 
                                final int start, final int end) {
        final FontMetrics fm = this.g2.getFontMetrics();
        final Rectangle2D bounds = TextUtilities.getTextBounds(
            text.substring(start, end), this.g2, fm
        );
        final float result = (float) bounds.getWidth();
        return result;
    }
    
}