private void _set(CadKit.Color.RGB rgb)
{
int[] hsv = CadKit.Color.HSV._convert(rgb);
if (null != hsv && 3 == hsv.Length)
{
h = hsv[0];
s = hsv[1];
v = hsv[2];
}
}
/// <summary>
/// Generate colors along the circumference.
/// </summary>
private static System.Drawing.Color[] _makeColors(int num, int value)
{
System.Drawing.Color[] colors = new System.Drawing.Color[num];
for (int i = 0; i < num; ++i)
{
float u = ((float)i) / (num - 1);
float hue = u * 255;
CadKit.Color.HSV hsv = new CadKit.Color.HSV((int)hue, 255, value);
CadKit.Color.RGB rgb = new CadKit.Color.RGB(hsv);
colors[i] = System.Drawing.Color.FromArgb(rgb.r, rgb.g, rgb.b);
}
return(colors);
}
/// <summary>
/// Adapted from: http://msdn.microsoft.com/msdnmag/issues/03/07/GDIColorPicker/
/// </summary>
private static int[] _convert(CadKit.Color.RGB rgb)
{
// In this function, R, G, and B values must be scaled
// to be between 0 and 1.
// HSV.Hue will be a value between 0 and 360, and
// HSV.Saturation and value are between 0 and 1.
// The code must scale these to be between 0 and 255 for
// the purposes of this application.
double min;
double max;
double delta;
double r = ( double )rgb.r / 255;
double g = ( double )rgb.g / 255;
double b = ( double )rgb.b / 255;
double h;
double s;
double v;
min = System.Math.Min(System.Math.Min(r, g), b);
max = System.Math.Max(System.Math.Max(r, g), b);
v = max;
delta = max - min;
if (max == 0 || delta == 0)
{
// R, G, and B must be 0, or all the same.
// In this case, S is 0, and H is undefined.
// Using H = 0 is as good as any...
s = 0;
h = 0;
}
else
{
s = delta / max;
if (r == max)
{
// Between Yellow and Magenta
h = (g - b) / delta;
}
else if (g == max)
{
// Between Cyan and Yellow
h = 2 + (b - r) / delta;
}
else
{
// Between Magenta and Cyan
h = 4 + (r - g) / delta;
}
}
// Scale h to be between 0 and 360.
// This may require adding 360, if the value
// is negative.
h *= 60;
if (h < 0)
{
h += 360;
}
// Scale to the requirements of this
// application. All values are between 0 and 255.
return(new int[] { ( int )(h / 360 * 255), ( int )(s * 255), ( int )(v * 255) });
}
public HSV(CadKit.Color.RGB rgb)
{
this._set(rgb);
}
