Java HSL Color Convert HSLtoRGB(float[] hsl)

Description

Converts from HSL color space to RGB color.

License

Open Source License

Parameter

Parameter	Description
hsl	the hsl values.

Return

the RGB color.

Declaration

public static int HSLtoRGB(float[] hsl) 

Method Source Code

//package com.java2s;

public class Main {
    /**//from   w w w . j  a v  a 2  s  .  c om
     * Converts from HSL color space to RGB color.
     *
     * @param hsl the hsl values.
     *
     * @return the RGB color.
     */
    public static int HSLtoRGB(float[] hsl) {
        float r, g, b, h, s, l; //this function works with floats between 0 and 1
        float temp1, temp2, tempr, tempg, tempb;
        h = hsl[0];
        s = hsl[1];
        l = hsl[2];

        // Then follows a trivial case: if the saturation is 0, the color will be a grayscale color,
        // and the calculation is then very simple: r, g and b are all set to the lightness.

        //If saturation is 0, the color is a shade of gray
        if (s == 0) {
            r = g = b = l;
        }
        // If the saturation is higher than 0, more calculations are needed again.
        // red, green and blue are calculated with the formulas defined in the code.
        // If saturation > 0, more complex calculations are needed
        else {
            //Set the temporary values
            if (l < 0.5)
                temp2 = l * (1 + s);
            else
                temp2 = (l + s) - (l * s);
            temp1 = 2 * l - temp2;
            tempr = h + 1.0f / 3.0f;
            if (tempr > 1)
                tempr--;
            tempg = h;
            tempb = h - 1.0f / 3.0f;
            if (tempb < 0)
                tempb++;

            //Red
            if (tempr < 1.0 / 6.0)
                r = temp1 + (temp2 - temp1) * 6.0f * tempr;
            else if (tempr < 0.5)
                r = temp2;
            else if (tempr < 2.0 / 3.0)
                r = temp1 + (temp2 - temp1) * ((2.0f / 3.0f) - tempr) * 6.0f;
            else
                r = temp1;

            //Green
            if (tempg < 1.0 / 6.0)
                g = temp1 + (temp2 - temp1) * 6.0f * tempg;
            else if (tempg < 0.5)
                g = temp2;
            else if (tempg < 2.0 / 3.0)
                g = temp1 + (temp2 - temp1) * ((2.0f / 3.0f) - tempg) * 6.0f;
            else
                g = temp1;

            //Blue
            if (tempb < 1.0 / 6.0)
                b = temp1 + (temp2 - temp1) * 6.0f * tempb;
            else if (tempb < 0.5)
                b = temp2;
            else if (tempb < 2.0 / 3.0)
                b = temp1 + (temp2 - temp1) * ((2.0f / 3.0f) - tempb) * 6.0f;
            else
                b = temp1;
        }

        // And finally, the results are returned as integers between 0 and 255.

        int result = 0;
        result += ((int) (r * 255) & 0xFF) << 16;
        result += ((int) (g * 255) & 0xFF) << 8;
        result += ((int) (b * 255) & 0xFF);

        return result;
    }
}

Related

1. hslToRgb(double hue, double sat, double lum)
2. HSLtoRGB(float h, float s, float l)
3. HslToRgb(float h, float s, float l, float a)
4. HSLtoRGB(float hue, float sat, float lum)
5. hslToRgb(float[] hsl)
6. hslToRGB(int h, float s, float l)
7. hueFromColor(Color c)