01: /* ===========================================================
02: * JFreeChart : a free chart library for the Java(tm) platform
03: * ===========================================================
04: *
05: * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.
06: *
07: * Project Info: http://www.jfree.org/jfreechart/index.html
08: *
09: * 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: }
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