Converts an integer to an HTML color representation. - Java 2D Graphics

Java examples for 2D Graphics:Color HTML

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Description

Converts an integer to an HTML color representation.

Demo Code

/**//from   www .  j  a v  a 2s. com
 * This file is part of emf2gv : an eclipse plugin that allows to
 * generate a graphical representation of an EMF model.
 *
 * Copyright 2010-2011 Jean-Francois Brazeau
 * 
 * emf2gv is free software: you can redistribute it and/or modify
 * it under the terms of either:
 * 
 *      a) the GNU Lesser General Public License as published by
 *       the Free Software Foundation, either version 3 of the License, or
 *       (at your option) any later version.
 *  or
 *      b) the Eclipse Public License version 1.0 as published by
 *       the Eclipse Foundation.
 * 
 * emf2gv 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 emf2gv.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * You should have received a copy of the  Eclipse Public License
 * along with emf2gv.  If not, see <http://www.eclipse.org/legal/epl-v10.html>.
 */
//package com.java2s;
import java.awt.Color;

public class Main {
    /** Hex characters */
    private static final char[] c = new char[] { '0', '1', '2', '3', '4',
            '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

    /**
     * Converts an integer to an HTML color representation.
     * 
     * @param color
     *            the color to convert.
     * @return the converted string.
     */
    public static String toHtmlColor(Color color) {
        String result = null;
        if (color != null) {
            char[] cars = new char[7];
            cars[0] = '#';
            toHex((byte) color.getRed(), cars, 1); // RED
            toHex((byte) color.getGreen(), cars, 3); // GREEN
            toHex((byte) color.getBlue(), cars, 5); // BLUE
            return new String(cars);
        } else {
            result = "#000000";
        }
        return result;
    }

    /**
     * Converts a byte value to hexadecimal and put the result in an array.
     * 
     * @param b
     *            the byte value to convert.
     * @param charArray
     *            the array in which the result is put.
     * @param from
     *            the array's index to use as a starting point.
     */
    private static void toHex(byte b, char[] charArray, int from) {
        charArray[from] = c[(b >> 4) & 0x0F];
        charArray[from + 1] = c[b & 0x0F];
    }
}

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