MaterialSkin2Framework/ColorHelper.cs at main · DigitalAdeel/MaterialSkin2Framework · GitHub

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using System;
using System.Drawing;

namespace MaterialSkin2Framework
{

    public static class ColorHelper
    {
        /// <summary>
        /// Tints the color by the given percent.
        /// </summary>
        /// <param name="color">The color being tinted.</param>
        /// <param name="percent">The percent to tint. Ex: 0.1 will make the color 10% lighter.</param>
        /// <returns>The new tinted color.</returns>
        public static Color Lighten(this Color color, float percent)
        {
            var lighting = color.GetBrightness();
            lighting = lighting + lighting * percent;
            if (lighting > 1.0)
            {
                lighting = 1;
            }
            else if (lighting <= 0)
            {
                lighting = 0.1f;
            }
            var tintedColor = ColorHelper.FromHsl(color.A, color.GetHue(), color.GetSaturation(), lighting);

            return tintedColor;
        }

        /// <summary>
        /// Tints the color by the given percent.
        /// </summary>
        /// <param name="color">The color being tinted.</param>
        /// <param name="percent">The percent to tint. Ex: 0.1 will make the color 10% darker.</param>
        /// <returns>The new tinted color.</returns>
        public static Color Darken(this Color color, float percent)
        {
            var lighting = color.GetBrightness();
            lighting = lighting - lighting * percent;
            if (lighting > 1.0)
            {
                lighting = 1;
            }
            else if (lighting <= 0)
            {
                lighting = 0;
            }
            var tintedColor = ColorHelper.FromHsl(color.A, color.GetHue(), color.GetSaturation(), lighting);

            return tintedColor;
        }

        /// <summary>
        /// Converts the HSL values to a Color.
        /// </summary>
        /// <param name="alpha">The alpha.</param>
        /// <param name="hue">The hue.</param>
        /// <param name="saturation">The saturation.</param>
        /// <param name="lighting">The lighting.</param>
        /// <returns></returns>
        public static Color FromHsl(int alpha, float hue, float saturation, float lighting)
        {
            if (0 > alpha || 255 < alpha)
            {
                throw new ArgumentOutOfRangeException("alpha");
            }
            if (0f > hue || 360f < hue)
            {
                throw new ArgumentOutOfRangeException("hue");
            }
            if (0f > saturation || 1f < saturation)
            {
                throw new ArgumentOutOfRangeException("saturation");
            }
            if (0f > lighting || 1f < lighting)
            {
                throw new ArgumentOutOfRangeException("lighting");
            }

            if (0 == saturation)
            {
                return Color.FromArgb(alpha, Convert.ToInt32(lighting * 255), Convert.ToInt32(lighting * 255), Convert.ToInt32(lighting * 255));
            }

            float fMax, fMid, fMin;
            int iSextant, iMax, iMid, iMin;

            if (0.5 < lighting)
            {
                fMax = lighting - (lighting * saturation) + saturation;
                fMin = lighting + (lighting * saturation) - saturation;
            }
            else
            {
                fMax = lighting + (lighting * saturation);
                fMin = lighting - (lighting * saturation);
            }

            iSextant = (int)Math.Floor(hue / 60f);
            if (300f <= hue)
            {
                hue -= 360f;
            }
            hue /= 60f;
            hue -= 2f * (float)Math.Floor(((iSextant + 1f) % 6f) / 2f);
            if (0 == iSextant % 2)
            {
                fMid = hue * (fMax - fMin) + fMin;
            }
            else
            {
                fMid = fMin - hue * (fMax - fMin);
            }

            iMax = Convert.ToInt32(fMax * 255);
            iMid = Convert.ToInt32(fMid * 255);
            iMin = Convert.ToInt32(fMin * 255);

            switch (iSextant)
            {
                case 1:
                    return Color.FromArgb(alpha, iMid, iMax, iMin);

                case 2:
                    return Color.FromArgb(alpha, iMin, iMax, iMid);

                case 3:
                    return Color.FromArgb(alpha, iMin, iMid, iMax);

                case 4:
                    return Color.FromArgb(alpha, iMid, iMin, iMax);

                case 5:
                    return Color.FromArgb(alpha, iMax, iMin, iMid);

                default:
                    return Color.FromArgb(alpha, iMax, iMid, iMin);
            }
        }

        /// <summary>
        /// Removes alpha value without changing Color.
        /// </summary>
        /// <param name="foreground">The foreground color.</param>
        /// <param name="background">The background color.</param>
        /// <returns></returns>
        public static Color RemoveAlpha(Color foreground, Color background)
        {
            if (foreground.A == 255)
                return foreground;

            var alpha = foreground.A / 255.0;
            var diff = 1.0 - alpha;
            return Color.FromArgb(255,
                (byte)(foreground.R * alpha + background.R * diff),
                (byte)(foreground.G * alpha + background.G * diff),
                (byte)(foreground.B * alpha + background.B * diff));
        }

    }
}