001/* =========================================================== 002 * JFreeChart : a free chart library for the Java(tm) platform 003 * =========================================================== 004 * 005 * (C) Copyright 2000-present, by David Gilbert and Contributors. 006 * 007 * Project Info: http://www.jfree.org/jfreechart/index.html 008 * 009 * This library is free software; you can redistribute it and/or modify it 010 * under the terms of the GNU Lesser General Public License as published by 011 * the Free Software Foundation; either version 2.1 of the License, or 012 * (at your option) any later version. 013 * 014 * This library is distributed in the hope that it will be useful, but 015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 017 * License for more details. 018 * 019 * You should have received a copy of the GNU Lesser General Public 020 * License along with this library; if not, write to the Free Software 021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 022 * USA. 023 * 024 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 025 * Other names may be trademarks of their respective owners.] 026 * 027 * -------------- 028 * DialScale.java 029 * -------------- 030 * (C) Copyright 2006-present, by David Gilbert. 031 * 032 * Original Author: David Gilbert; 033 * Contributor(s): -; 034 * 035 */ 036 037package org.jfree.chart.plot.dial; 038 039/** 040 * A dial scale is a specialised layer that has the ability to convert data 041 * values into angles. 042 */ 043public interface DialScale extends DialLayer { 044 045 /** 046 * Converts a data value to an angle (in degrees, using the same 047 * specification as Java's Arc2D class). 048 * 049 * @param value the data value. 050 * 051 * @return The angle in degrees. 052 * 053 * @see #angleToValue(double) 054 */ 055 double valueToAngle(double value); 056 057 /** 058 * Converts an angle (in degrees) to a data value. 059 * 060 * @param angle the angle (in degrees). 061 * 062 * @return The data value. 063 * 064 * @see #valueToAngle(double) 065 */ 066 double angleToValue(double angle); 067 068}