Ejemplo n.º 1
0
        /// Converts a WPF HSL color to an RGB color
        public static Color HlsToRgb(HlsColor hlsColor)
        {
            // Initialize result
            var rgbColor = new Color();

            /* If S = 0, that means we are dealing with a shade
            * of gray. So, we set R, G, and B to L and exit. */

            // Special case: Gray
            if (hlsColor.S == 0)
            {
                rgbColor.R = (byte)(hlsColor.L * 255);
                rgbColor.G = (byte)(hlsColor.L * 255);
                rgbColor.B = (byte)(hlsColor.L * 255);
                rgbColor.A = (byte)(hlsColor.A * 255);
                return(rgbColor);
            }

            double t1;

            if (hlsColor.L < 0.5)
            {
                t1 = hlsColor.L * (1.0 + hlsColor.S);
            }
            else
            {
                t1 = hlsColor.L + hlsColor.S - (hlsColor.L * hlsColor.S);
            }

            var t2 = 2.0 * hlsColor.L - t1;

            // Convert H from degrees to a percentage
            var h = hlsColor.H / 360;

            // Set colors as percentage values
            var tR = h + (1.0 / 3.0);
            var r  = SetColor(t1, t2, tR);

            var tG = h;
            var g  = SetColor(t1, t2, tG);

            var tB = h - (1.0 / 3.0);
            var b  = SetColor(t1, t2, tB);

            // Assign colors to Color object
            rgbColor.R = (byte)(r * 255);
            rgbColor.G = (byte)(g * 255);
            rgbColor.B = (byte)(b * 255);
            rgbColor.A = (byte)(hlsColor.A * 255);

            // Set return value
            return(rgbColor);
        }
Ejemplo n.º 2
0
        // Converts a WPF RGB color to an HSL color
        public static HlsColor RgbToHls(Color rgbColor)
        {
            // Initialize result
            var hlsColor = new HlsColor();

            // Convert RGB values to percentages
            var r = (double)rgbColor.R / 255;
            var g = (double)rgbColor.G / 255;
            var b = (double)rgbColor.B / 255;

            hlsColor.A = (double)rgbColor.A / 255;

            // Find min and max RGB values
            var min   = Math.Min(r, Math.Min(g, b));
            var max   = Math.Max(r, Math.Max(g, b));
            var delta = max - min;

            /* If max and min are equal, that means we are dealing with
             * a shade of gray. So we set H and S to zero, and L to either
             * max or min (it doesn't matter which), and  then we exit. */

            //Special case: Gray
            if (max == min)
            {
                hlsColor.H = 0;
                hlsColor.S = 0;
                hlsColor.L = max;
                return(hlsColor);
            }

            /* If we get to this point, we know we don't have a shade of gray. */

            // Set L
            hlsColor.L = (min + max) / 2;

            // Set S
            if (hlsColor.L < 0.5)
            {
                hlsColor.S = delta / (max + min);
            }
            else
            {
                hlsColor.S = delta / (2.0 - max - min);
            }

            // Set H
            if (r == max)
            {
                hlsColor.H = (g - b) / delta;
            }
            if (g == max)
            {
                hlsColor.H = 2.0 + (b - r) / delta;
            }
            if (b == max)
            {
                hlsColor.H = 4.0 + (r - g) / delta;
            }
            hlsColor.H *= 60;
            if (hlsColor.H < 0)
            {
                hlsColor.H += 360;
            }

            // Set return value
            return(hlsColor);
        }