001: /* ====================================================================
002: * The JRefactory License, Version 1.0
003: *
004: * Copyright (c) 2001 JRefactory. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in
015: * the documentation and/or other materials provided with the
016: * distribution.
017: *
018: * 3. The end-user documentation included with the redistribution,
019: * if any, must include the following acknowledgment:
020: * "This product includes software developed by the
021: * JRefactory (http://www.sourceforge.org/projects/jrefactory)."
022: * Alternately, this acknowledgment may appear in the software itself,
023: * if and wherever such third-party acknowledgments normally appear.
024: *
025: * 4. The names "JRefactory" must not be used to endorse or promote
026: * products derived from this software without prior written
027: * permission. For written permission, please contact seguin@acm.org.
028: *
029: * 5. Products derived from this software may not be called "JRefactory",
030: * nor may "JRefactory" appear in their name, without prior written
031: * permission of Chris Seguin.
032: *
033: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036: * DISCLAIMED. IN NO EVENT SHALL THE CHRIS SEGUIN OR
037: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044: * SUCH DAMAGE.
045: * ====================================================================
046: *
047: * This software consists of voluntary contributions made by many
048: * individuals on behalf of JRefactory. For more information on
049: * JRefactory, please see
050: * <http://www.sourceforge.org/projects/jrefactory>.
051: */
052: package org.acm.seguin.uml.line;
053:
054: import java.awt.Font;
055: import java.awt.FontMetrics;
056: import java.awt.Graphics;
057: import java.awt.image.BufferedImage;
058:
059: /**
060: * Class responsible for computing the size of a label
061: *
062: *@author Chris Seguin
063: *@created September 12, 2001
064: */
065: public class LabelSizeComputation {
066: private Graphics g;
067: private static LabelSizeComputation singleton;
068:
069: /**
070: * Constructor for the LabelSizeComputation object
071: */
072: private LabelSizeComputation() {
073: BufferedImage doubleBuffer = new BufferedImage(300, 25,
074: BufferedImage.TYPE_INT_RGB);
075: g = doubleBuffer.getGraphics();
076: }
077:
078: /**
079: * Computes the size of a piece of text given a font
080: *
081: *@param text the text
082: *@param font the font
083: *@return information about the size of the text
084: */
085: public TextInfo compute(String text, Font font) {
086: TextInfo result = new TextInfo();
087:
088: // Determine the appropriate size
089: g.setFont(font);
090: FontMetrics fm = g.getFontMetrics();
091: result.height = Math.max(1, fm.getHeight());
092: if (text != null) {
093: result.width = Math.max(1, fm.stringWidth(text));
094: } else {
095: result.width = 1;
096: }
097:
098: result.ascent = fm.getAscent();
099:
100: return result;
101: }
102:
103: /**
104: * Computes the size of a piece of text given a font
105: *
106: *@param text the text
107: *@param font the font
108: *@return information about the size of the text
109: */
110: public int computeHeight(String text, Font font) {
111: TextInfo ti = compute(text, font);
112: return ti.height;
113: }
114:
115: /**
116: * Factory method for this object
117: *
118: *@return Creates a single instance of this object
119: */
120: public static LabelSizeComputation get() {
121: if (singleton == null) {
122: init();
123: }
124:
125: return singleton;
126: }
127:
128: /**
129: * Initializer for the singleton
130: */
131: private static synchronized void init() {
132: if (singleton == null) {
133: singleton = new LabelSizeComputation();
134: }
135: }
136: }
|