return a new color based on the given color with the specified alpha value - Java 2D Graphics

Java examples for 2D Graphics:Color Alpha

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Description

return a new color based on the given color with the specified alpha value

Demo Code

/**/* w w  w . ja  v a2  s  . c  o m*/
 * OrbisGIS is a java GIS application dedicated to research in GIScience.
 * OrbisGIS is developed by the GIS group of the DECIDE team of the 
 * Lab-STICC CNRS laboratory, see <http://www.lab-sticc.fr/>.
 *
 * The GIS group of the DECIDE team is located at :
 *
 * Laboratoire Lab-STICC ? CNRS UMR 6285
 * Equipe DECIDE
 * UNIVERSIT? DE BRETAGNE-SUD
 * Institut Universitaire de Technologie de Vannes
 * 8, Rue Montaigne - BP 561 56017 Vannes Cedex
 * 
 * OrbisGIS is distributed under GPL 3 license.
 *
 * Copyright (C) 2007-2014 CNRS (IRSTV FR CNRS 2488)
 * Copyright (C) 2015-2016 CNRS (Lab-STICC UMR CNRS 6285)
 *
 * This file is part of OrbisGIS.
 *
 * OrbisGIS 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.
 *
 * OrbisGIS 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
 * OrbisGIS. If not, see <http://www.gnu.org/licenses/>.
 *
 * For more information, please consult: <http://www.orbisgis.org/>
 * or contact directly:
 * info_at_ orbisgis.org
 */
//package com.java2s;
import java.awt.Color;

public class Main {
    /**
     * The greatest possible value foa a RGB component.
     */
    public static final int MAX_RGB_VALUE = 255;

    /**
     * return a new color based on the given color with the specified alpha value
     * @param c
     * @param alpha [0;1]
     * @return new color with alpha channel
     */
    public static Color getColorWithAlpha(Color c, double alpha) {
        int a = (int) (MAX_RGB_VALUE * alpha);

        if (a < 0) {
            a = 0;
        } else if (a > MAX_RGB_VALUE) {
            a = MAX_RGB_VALUE;
        }

        if (c != null) {
            return new Color(c.getRed(), c.getGreen(), c.getBlue(), a);
        } else {
            return new Color(MAX_RGB_VALUE, MAX_RGB_VALUE, MAX_RGB_VALUE, a); // WhiteTrans
        }

    }
}

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