private void CalcCoordsAndUpdate(HSV HSV)
{
// Convert color to real-world coordinates and then calculate the various points. HSV.Hue represents the degrees (0 to 360),
// HSV.Saturation represents the radius. This procedure doesn't draw anything--it simply updates class-level variables. The UpdateDisplay
// procedure uses these values to update the screen.
// Given the angle (HSV.Hue), and distance from the center (HSV.Saturation), and the center, calculate the point corresponding to
// the selected color, on the color wheel.
colorPoint = GetPoint((double)HSV.Hue / 255 * 360, (double)HSV.Saturation / 255 * radius, centerPoint);
// Given the brightness (HSV.value), calculate the point corresponding to the brightness indicator.
brightnessPoint = CalcBrightnessPoint(HSV.Value);
// Store information about the selected color.
brightness = HSV.Value;
selectedColor = ColorHelper.HSVtoColor(HSV);
RGB = ColorHelper.HSVtoRGB(HSV);
// The full color is the same as HSV, except that the brightness is set to full (255). This is the top-most
// color in the brightness gradient.
fullColor = ColorHelper.HSVtoColor(HSV.Hue, HSV.Saturation, 255);
}
protected void OnColorChanged(RGB RGB, HSV HSV)
{
ColorChanged(this, new ColorChangedEventArgs(RGB, HSV));
}
protected void OnColorChanged(RGB RGB, HSV HSV)
{
//ColorChanged(this, new ColorChangedEventArgs(selectedColor));
}
public ColorChangedEventArgs(RGB RGB, HSV HSV)
{
mRGB = RGB;
mHSV = HSV;
}
public static RGB HSVtoRGB(HSV hsv)
{
// HSV contains values scaled as in the color wheel: that is, all from 0 to 255.
// for ( this code to work, HSV.Hue needs to be scaled from 0 to 360 (it//s the angle of the selected
// point within the circle). HSV.Saturation and HSV.value must be scaled to be between 0 and 1.
double h = 0D, s = 0D, v = 0D;
double r = 0D, g = 0D, b = 0D;
// Scale Hue to be between 0 and 360. Saturation and value scale to be between 0 and 1.
h = ((double)hsv.Hue / 255 * 360) % 360;
s = (double)hsv.Saturation / 255;
v = (double)hsv.Value / 255;
if (s == 0)
{
// If s is 0, all colors are the same. This is some flavor of gray.
r = v;
g = v;
b = v;
}
else
{
double p = 0D, q = 0D, t = 0D;
double fractionalSector;
double sectorPos;
int sectorNumber;
// The color wheel consists of 6 sectors. Figure out which sector you//re in.
sectorPos = h / 60;
sectorNumber = (int)(Math.Floor(sectorPos));
// get the fractional part of the sector. That is, how many degrees into the sector are you?
fractionalSector = sectorPos - sectorNumber;
// Calculate values for the three axes of the color.
p = v * (1 - s);
q = v * (1 - (s * fractionalSector));
t = v * (1 - (s * (1 - fractionalSector)));
// Assign the fractional colors to r, g, and b based on the sector the angle is in.
switch (sectorNumber)
{
case 0:
r = v;
g = t;
b = p;
break;
case 1:
r = q;
g = v;
b = p;
break;
case 2:
r = p;
g = v;
b = t;
break;
case 3:
r = p;
g = q;
b = v;
break;
case 4:
r = t;
g = p;
b = v;
break;
case 5:
r = v;
g = p;
b = q;
break;
}
}
// return an RGB structure, with values scaled to be between 0 and 255.
return(new RGB((byte)(r * 255), (byte)(g * 255), (byte)(b * 255)));
}
public static Color HSVtoColor(HSV hsv)
{
RGB rgb = HSVtoRGB(hsv);
return(Color.FromArgb(rgb.Red, rgb.Green, rgb.Blue));
}
