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Java > Open Source Codes > org > jfree > text > G2TextMeasurer


1 /* ========================================================================
2  * JCommon : a free general purpose class library for the Java(tm) platform
3  * ========================================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jcommon/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * -------------------
28  * G2TextMeasurer.java
29  * -------------------
30  * (C) Copyright 2004, 2005, by Object Refinery Limited and Contributors.
31  *
32  * Original Author: David Gilbert (for Object Refinery Limited);
33  * Contributor(s): -;
34  *
35  * $Id: G2TextMeasurer.java,v 1.4 2005/10/18 13:17:16 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 07-Jan-2004 : Version 1 (DG);
40  *
41  */
42  
43 package org.jfree.text;
44
45 import java.awt.FontMetrics JavaDoc;
46 import java.awt.Graphics2D JavaDoc;
47 import java.awt.geom.Rectangle2D JavaDoc;
48
49 /**
50  * A {@link TextMeasurer} based on a {@link Graphics2D}.
51  *
52  * @author David Gilbert
53  */
54 public class G2TextMeasurer implements TextMeasurer {
55
56     /** The graphics device. */
57     private Graphics2D JavaDoc g2;
58     
59     /**
60      * Creates a new text measurer.
61      *
62      * @param g2 the graphics device.
63      */
64     public G2TextMeasurer(final Graphics2D JavaDoc g2) {
65         this.g2 = g2;
66     }
67
68     /**
69      * Returns the string width.
70      *
71      * @param text the text.
72      * @param start the index of the first character to measure.
73      * @param end the index of the last character to measure.
74      *
75      * @return The string width.
76      */
77     public float getStringWidth(final String JavaDoc text,
78                                 final int start, final int end) {
79         final FontMetrics JavaDoc fm = this.g2.getFontMetrics();
80         final Rectangle2D JavaDoc bounds = TextUtilities.getTextBounds(
81             text.substring(start, end), this.g2, fm
82         );
83         final float result = (float) bounds.getWidth();
84         return result;
85     }
86     
87 }
88
89
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