Java Color Decode decodeColor(final double v)

Description

Convert a double value to a color.

License

LGPL

Parameter

Parameter	Description
v	the double value completely describing the color

Return

the color

Declaration

public static final Color decodeColor(final double v) 

Method Source Code

//package com.java2s;
// GNU LESSER GENERAL PUBLIC LICENSE (Version 2.1, February 1999)

import java.awt.Color;

public class Main {
    /** the alpha frequency */
    private static final double A_FREQ = (2 * Math.PI);
    /** the red frequency */
    private static final double R_FREQ = A_FREQ + 1d;
    /** the green frequency */
    private static final double G_FREQ = R_FREQ + 1d;
    /** the blue frequency */
    private static final double B_FREQ = G_FREQ + 1d;

    /**/*from  www. j  ava 2 s  . c om*/
     * Convert a double value to a color. The value v can be more or less
     * arbitrary and is translated to a color and alpha value.
     *
     * @param v
     *          the double value completely describing the color
     * @return the color
     */
    public static final Color decodeColor(final double v) {
        if (Double.isInfinite(v) || Double.isNaN(v)) {
            return Color.BLACK;
        }
        return new Color(//
                isin(v, R_FREQ), //
                isin(v, G_FREQ), //
                isin(v, B_FREQ), //
                isin(v, A_FREQ));
    }

    /**
     * The internal sinus conversion function
     *
     * @param x
     *          the x coordinate
     * @param f
     *          the frequency
     * @return the sinus
     */
    private static final float isin(final double x, final double f) {
        return Math.min(1f, Math.max(0f, (float) (0.5d + Math.sin(x * f))));
    }
}

Related

1. decode(String color)
2. decodeColor(final String value)
3. decodeColor(int color)
4. decodeColor(int value)
5. decodeColor(String color, Color defaultColor)