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Java > Open Source Codes > org > apache > fop > datatypes > FixedLength


1 /*
2  * $Id: FixedLength.java,v 1.1.2.1 2003/02/25 10:48:28 jeremias Exp $
3  * ============================================================================
4  * The Apache Software License, Version 1.1
5  * ============================================================================
6  *
7  * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without modifica-
10  * tion, are permitted provided that the following conditions are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright notice,
13  * this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
17  * and/or other materials provided with the distribution.
18  *
19  * 3. The end-user documentation included with the redistribution, if any, must
20  * include the following acknowledgment: "This product includes software
21  * developed by the Apache Software Foundation (http://www.apache.org/)."
22  * Alternately, this acknowledgment may appear in the software itself, if
23  * and wherever such third-party acknowledgments normally appear.
24  *
25  * 4. The names "FOP" and "Apache Software Foundation" must not be used to
26  * endorse or promote products derived from this software without prior
27  * written permission. For written permission, please contact
28  * apache@apache.org.
29  *
30  * 5. Products derived from this software may not be called "Apache", nor may
31  * "Apache" appear in their name, without prior written permission of the
32  * Apache Software Foundation.
33  *
34  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
35  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
36  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
37  * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
38  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
39  * DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
40  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
41  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
42  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
43  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
44  * ============================================================================
45  *
46  * This software consists of voluntary contributions made by many individuals
47  * on behalf of the Apache Software Foundation and was originally created by
48  * James Tauber <jtauber@jtauber.com>. For more information on the Apache
49  * Software Foundation, please see <http://www.apache.org/>.
50  */
51 package org.apache.fop.datatypes;
52
53 import org.apache.fop.fo.expr.Numeric;
54 import org.apache.fop.messaging.MessageHandler;
55
56 /**
57  * a length quantity in XSL
58  */
59 public class FixedLength extends Length {
60
61     /**
62      * Set the length given a number of relative units and the current
63      * font size in base units.
64      */
65     public FixedLength(double numRelUnits, int iCurFontSize) {
66         setComputedValue((int)(numRelUnits * (double)iCurFontSize));
67     }
68
69     /**
70      * Set the length given a number of units and a unit name.
71      */
72     public FixedLength(double numUnits, String JavaDoc units) {
73         convert(numUnits, units);
74     }
75
76     /**
77      * set the length as a number of base units
78      */
79     public FixedLength(int baseUnits) {
80         setComputedValue(baseUnits);
81     }
82
83     /**
84      * Convert the given length to a dimensionless integer representing
85      * a whole number of base units (milli-points).
86      */
87     protected void convert(double dvalue, String JavaDoc unit) {
88
89         int assumed_resolution = 1; // points/pixel
90
91         if (unit.equals("in"))
92             dvalue = dvalue * 72;
93         else if (unit.equals("cm"))
94             dvalue = dvalue * 28.3464567;
95         else if (unit.equals("mm"))
96             dvalue = dvalue * 2.83464567;
97         else if (unit.equals("pt"))
98             dvalue = dvalue;
99         else if (unit.equals("pc"))
100             dvalue = dvalue * 12;
101             /*
102              * else if (unit.equals("em"))
103              * dvalue = dvalue * fontsize;
104              */
105         else if (unit.equals("px"))
106             dvalue = dvalue * assumed_resolution;
107         else {
108             dvalue = 0;
109             MessageHandler.errorln("unknown length unit '" + unit
110                                    + "'");
111         }
112         setComputedValue((int)(dvalue * 1000));
113     }
114
115     public Numeric asNumeric() {
116         return new Numeric(this);
117     }
118 }
119
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