Source for 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;
  46: import java.awt.Graphics2D;
  47: import java.awt.geom.Rectangle2D;
  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 g2;
  58:     
  59:     /**
  60:      * Creates a new text measurer.
  61:      * 
  62:      * @param g2  the graphics device.
  63:      */
  64:     public G2TextMeasurer(final Graphics2D 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 text, 
  78:                                 final int start, final int end) {
  79:         final FontMetrics fm = this.g2.getFontMetrics();
  80:         final Rectangle2D 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: }