set Alpha Value - Java 2D Graphics

Java examples for 2D Graphics:Color

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Description

set Alpha Value

Demo Code


//package com.java2s;

public class Main {
    public static int setAlphaValue(int argb, double alpha) {
        int a = argb >> 24 & 0xFF; // Alpha
        int r = argb >> 16 & 0xFF; // Red
        int g = argb >> 8 & 0xFF; // Green
        int b = argb & 0xFF; // blue
        a = (int) Math.round(alpha * a);

        // argb = a << 24 & 0xFF000000 | r << 16 & 0xFF0000 | g << 8 & 0xFF00 | b & 0xFF;
        argb = ((a << 24) & 0xFF000000) | ((r << 16) & 0x00FF0000)
                | ((g << 8) & 0x0000FF00) | ((b) & 0x000000FF);
        return argb;
    }/*  w  w  w  . ja v  a 2  s .  c  o m*/
}

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