Blends two colors and returns the result - Java 2D Graphics

Java examples for 2D Graphics:Color

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Description

Blends two colors and returns the result

Demo Code

/* Copyright (c) 2011 Danish Maritime Authority.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License./*from  w ww  .java2s .  co m*/
 */
//package com.java2s;

import java.awt.Color;

public class Main {
    /**
     * Blends two colors and returns the result
     * 
     * @param c0 the first color
     * @param c1 the second color
     * @return the blended result
     */
    public static Color blendColors(Color c0, Color c1) {
        double totalAlpha = c0.getAlpha() + c1.getAlpha();
        double weight0 = c0.getAlpha() / totalAlpha;
        double weight1 = c1.getAlpha() / totalAlpha;

        double r = weight0 * c0.getRed() + weight1 * c1.getRed();
        double g = weight0 * c0.getGreen() + weight1 * c1.getGreen();
        double b = weight0 * c0.getBlue() + weight1 * c1.getBlue();
        double a = Math.max(c0.getAlpha(), c1.getAlpha());

        return new Color((int) r, (int) g, (int) b, (int) a);
    }
}

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