darken color by darken each R G B value - Android Graphics

Android examples for Graphics:Color Darken

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Description

darken color by darken each R G B value

Demo Code

/*//w  ww. j a va  2s. c o  m
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Jordon de Hoog
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
//package com.java2s;
import android.graphics.Color;

public class Main {
    public static int darken(int color, float fraction) {
        int red = Color.red(color);
        int green = Color.green(color);
        int blue = Color.blue(color);
        red = darkenColor(red, fraction);
        green = darkenColor(green, fraction);
        blue = darkenColor(blue, fraction);
        int alpha = Color.alpha(color);

        return Color.argb(alpha, red, green, blue);
    }

    public static int darken(int color) {
        return darken(color, 0.3f);
    }

    private static int darkenColor(int color, float fraction) {
        return (int) Math.max(color - (color * fraction), 0);
    }
}

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