jfreechart example source code file (CompassFormat.java)

This example jfreechart source code file (CompassFormat.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - jfreechart tags/keywords

compassformat, directions, e, e, fieldposition, n, n, parseposition, s, s, string, stringbuffer, text, w, w

The jfreechart CompassFormat.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ------------------
 * CompassFormat.java
 * ------------------
 * (C) Copyright 2003-2008, by Sylvain Vieujot and Contributors.
 *
 * Original Author:  Sylvain Vieujot;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 18-Feb-2004 : Version 1 contributed by Sylvain Vieujot (DG);
 *
 */

package org.jfree.chart.axis;

import java.text.FieldPosition;
import java.text.NumberFormat;
import java.text.ParsePosition;

/**
 * A formatter that displays numbers as directions.
 */
public class CompassFormat extends NumberFormat {

    /** North. */
    private static final String N = "N";

    /** East. */
    private static final String E = "E";

    /** South. */
    private static final String S = "S";

    /** West. */
    private static final String W = "W";

    /** The directions. */
    public static final String[] DIRECTIONS = {
        N, N + N + E, N + E, E + N + E, E, E + S + E, S + E, S + S + E, S,
        S + S + W, S + W, W + S + W, W, W + N + W, N + W, N + N + W, N
    };

    /**
     * Creates a new formatter.
     */
    public CompassFormat() {
        super();
    }

    /**
     * Returns a string representing the direction.
     *
     * @param direction  the direction.
     *
     * @return A string.
     */
    public String getDirectionCode(double direction) {

        direction = direction % 360;
        if (direction < 0.0) {
            direction = direction + 360.0;
        }
        int index = ((int) Math.floor(direction / 11.25) + 1) / 2;
        return DIRECTIONS[index];

    }

    /**
     * Formats a number into the specified string buffer.
     *
     * @param number  the number to format.
     * @param toAppendTo  the string buffer.
     * @param pos  the field position (ignored here).
     *
     * @return The string buffer.
     */
    public StringBuffer format(double number, StringBuffer toAppendTo,
                               FieldPosition pos) {
        return toAppendTo.append(getDirectionCode(number));
    }

    /**
     * Formats a number into the specified string buffer.
     *
     * @param number  the number to format.
     * @param toAppendTo  the string buffer.
     * @param pos  the field position (ignored here).
     *
     * @return The string buffer.
     */
    public StringBuffer format(long number, StringBuffer toAppendTo,
                               FieldPosition pos) {
        return toAppendTo.append(getDirectionCode(number));
    }

    /**
     * This method returns <code>null for all inputs.  This class cannot
     * be used for parsing.
     *
     * @param source  the source string.
     * @param parsePosition  the parse position.
     *
     * @return <code>null.
     */
    public Number parse(String source, ParsePosition parsePosition) {
        return null;
    }

}