WPF将RGB转为HSL的工具类

class HSLColor

{

private int _alpha = 255;

public int _hue = 0;

public double _saturation = 1d;

public double _lightness = 1d;

//public double H;

//public double S;

//public double L;

public HSLColor()

{

}

public HSLColor(Color color)

{

_alpha = color.A;

FromRGB(color);

//double h = 0;

//double s = 0;

//double l = 0;

//RGB2HSL(color, out h, out s, out l);

//H = 255 * h;

//S = 255 * s;

//L = 255 * l;

}

private void FromRGB(Color color)

{

double r = ((double)color.R) / 255;

double g = ((double)color.G) / 255;

double b = ((double)color.B) / 255;

double min = Math.Min(Math.Min(r, g), b);

double max = Math.Max(Math.Max(r, g), b);

double distance = max - min;

_lightness = (max + min) / 2;

if (distance == 0)

{

_hue = 0;

_saturation = 0;

}

else

{

double hueTmp;

_saturation =

(_lightness < 0.5) ?

(distance / (max + min)) : (distance / ((2 - max) - min));

double tempR = (((max - r) / 6) + (distance / 2)) / distance;

double tempG = (((max - g) / 6) + (distance / 2)) / distance;

double tempB = (((max - b) / 6) + (distance / 2)) / distance;

if (r == max)

{

hueTmp = tempB - tempG;

}

else if (g == max)

{

hueTmp = (0.33333333333333331 + tempR) - tempB;

}

else

{

hueTmp = (0.66666666666666663 + tempG) - tempR;

}

if (hueTmp < 0)

{

hueTmp += 1;

}

if (hueTmp > 1)

{

hueTmp -= 1;

}

_hue = (int)(hueTmp * 250);

_saturation = _saturation * 240;

_lightness = _lightness * 200;

}

public static void RGB2HSL(Color rgb, out double h, out double s, out double l)

{

double r = rgb.R / 255.0;

double g = rgb.G / 255.0;

double b = rgb.B / 255.0;

double v;

double m;

double vm;

double r2, g2, b2;

h = 0; // default to black

s = 0;

l = 0;

v = Math.Max(r, g);

v = Math.Max(v, b);

m = Math.Min(r, g);

m = Math.Min(m, b);

l = (m + v) / 2.0;

if (l <= 0.0)

{

return;

}

vm = v - m;

s = vm;

if (s > 0.0)

{

s /= (l <= 0.5) ? (v + m) : (2.0 - v - m);

}

else

{

return;

}

r2 = (v - r) / vm;

g2 = (v - g) / vm;

b2 = (v - b) / vm;

if (r == v)

{

h = (g == m ? 5.0 + b2 : 1.0 - g2);

}

else if (g == v)

{

h = (b == m ? 1.0 + r2 : 3.0 - b2);

}

else

{

h = (r == m ? 3.0 + g2 : 5.0 - r2);

}

h /= 6.0;

}

巴特西

WPF将RGB转为HSL的工具类

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