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Java > Open Source Codes > org > jfree > experimental > chart > plot > dial > DialScale


1 /* ===========================================================
2  * JFreeChart : a free chart library for the Java(tm) platform
3  * ===========================================================
4  *
5  * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jfreechart/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  * DialScale.java
29  * --------------
30  * (C) Copyright 2006, by Object Refinery Limited.
31  *
32  * Original Author: David Gilbert (for Object Refinery Limited);
33  * Contributor(s): -;
34  *
35  * $Id: DialScale.java,v 1.1.2.1 2006/11/03 17:03:40 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 03-Nov-2006 : Version 1 (DG);
40  *
41  */
42
43 package org.jfree.experimental.chart.plot.dial;
44
45 /**
46  * A dial scale converts data values into angles.
47  */
48 public interface DialScale {
49     
50     /**
51      * Converts a data value to an angle (in degrees, using the same
52      * specification as Java's Arc2D class).
53      *
54      * @param value the data value.
55      *
56      * @return The angle in degrees.
57      */
58     public double valueToAngle(double value);
59     
60     /**
61      * Converts an angle (in degrees) to a data value.
62      *
63      * @param angle the angle (in degrees).
64      *
65      * @return The data value.
66      */
67     public double angleToValue(double angle);
68     
69 }
70
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