source: trunk/src/org/expeditee/gui/ColorUtils.java@ 919

/**
 *    ColorUtils.java
 *    Copyright (C) 2010 New Zealand Digital Library, http://expeditee.org
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    This program 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 General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.expeditee.gui;

import java.awt.Color;

public class ColorUtils {

        /**
         * Gets the next color in the specified color wheel.
         * 
         * @param color
         *            the current color
         * @param wheel
         *            the color wheel from which to find the next color
         * @param skip
         *            a color to ignore, for example the current background color
         *            when getting the next foreground color or null if no colors
         *            should be skipped
         * @return the next color on the color wheel
         */
        public static Color getNextColor(Color color, Color[] wheel, Color skip) {
                if (color == null) {
                        color = wheel[0];
                } else {
                        // search through the colour wheel to find the next colour
                        int pos = -1;
                        for (int i = 0; i < wheel.length; i++) {
                                if (color.equals(wheel[i])) {
                                        pos = i;
                                        break;
                                }
                        }
                        pos++;
                        pos = pos % wheel.length;
                        color = wheel[pos];
                }
                
                if (skip != null && skip.equals(color))
                        return getNextColor(color, wheel, skip);

                return color;
        }
}