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Java > Open Source Codes > org > krysalis > barcode > tools > UnitConv


1 /*
2  * $Id: UnitConv.java,v 1.6 2003/08/18 19:09:54 jmaerki Exp $
3  * ============================================================================
4  * The Krysalis Patchy Software License, Version 1.1_01
5  * Copyright (c) 2002-2003 Nicola Ken Barozzi. All rights reserved.
6  *
7  * This Licence is compatible with the BSD licence as described and
8  * approved by http://www.opensource.org/, and is based on the
9  * Apache Software Licence Version 1.1.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  *
15  * 1. Redistributions of source code must retain the above copyright
16  * notice, this list of conditions and the following disclaimer.
17  *
18  * 2. Redistributions in binary form must reproduce the above copyright
19  * notice, this list of conditions and the following disclaimer in
20  * the documentation and/or other materials provided with the
21  * distribution.
22  *
23  * 3. The end-user documentation included with the redistribution,
24  * if any, must include the following acknowledgment:
25  * "This product includes software developed for project
26  * Krysalis (http://www.krysalis.org/)."
27  * Alternately, this acknowledgment may appear in the software itself,
28  * if and wherever such third-party acknowledgments normally appear.
29  *
30  * 4. The names "Krysalis" and "Nicola Ken Barozzi" and
31  * "Krysalis Barcode" must not be used to endorse or promote products
32  * derived from this software without prior written permission. For
33  * written permission, please contact nicolaken@krysalis.org.
34  *
35  * 5. Products derived from this software may not be called "Krysalis",
36  * "Krysalis Barcode", nor may "Krysalis" appear in their name,
37  * without prior written permission of Nicola Ken Barozzi.
38  *
39  * 6. This software may contain voluntary contributions made by many
40  * individuals, who decided to donate the code to this project in
41  * respect of this licence, and was originally created by
42  * Jeremias Maerki <jeremias@maerki.org>.
43  *
44  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
45  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
46  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
47  * DISCLAIMED. IN NO EVENT SHALL THE KRYSALIS PROJECT OR
48  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
49  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
50  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
51  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
52  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
53  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
54  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
55  * SUCH DAMAGE.
56  * ====================================================================
57  */
58 package org.krysalis.barcode.tools;
59
60 /**
61  * Utility class for unit conversions.
62  *
63  * @author Jeremias Maerki
64  */
65 public class UnitConv {
66
67     /**
68      * Utility class: Constructor prevents instantiating when subclassed.
69      */
70     protected UnitConv() {
71         throw new UnsupportedOperationException JavaDoc();
72     }
73     
74     /**
75      * Converts millimeters (mm) to points (pt)
76      * @param mm the value in mm
77      * @return the value in pt
78      */
79     public static double mm2pt(double mm) {
80         return mm * 2.835;
81     }
82
83     /**
84      * Converts points (pt) to millimeters (mm)
85      * @param pt the value in pt
86      * @return the value in mm
87      */
88     public static double pt2mm(double pt) {
89         return pt / 2.835;
90     }
91     
92     /**
93      * Converts millimeters (mm) to inches (in)
94      * @param mm the value in mm
95      * @return the value in inches
96      */
97     public static double mm2in(double mm) {
98         return mm / 25.4;
99     }
100     
101     /**
102      * Converts inches (in) to millimeters (mm)
103      * @param in the value in inches
104      * @return the value in mm
105      */
106     public static double in2mm(double in) {
107         return in * 25.4;
108     }
109     
110     /**
111      * Converts millimeters (mm) to pixels (px)
112      * @param mm the value in mm
113      * @param resolution the resolution in dpi (dots per inch)
114      * @return the value in pixels
115      */
116     public static int mm2px(double mm, int resolution) {
117         return (int)Math.round(mm2in(mm) * resolution);
118     }
119
120 }
121
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