/// <summary>
/// Returns the RGB color from a specific position of the saturation scale.
/// </summary>
/// <param name="y">The vertical position from up to bottom.</param>
/// <param name="height">Total height of the scale.</param>
/// <param name="hue">Current HUE of the saturation scale.</param>
/// <returns></returns>
public Color PickSaturationPixelColor(int y, int height, double hue)
{
if (y <= 6 || height - y <= 6)
{
return(Colors.Transparent);
}
return(ColorConverters.HueSaturation(hue == 360 ? 0 : hue / 360 * (2 * Math.PI),
1 - ((double)y - 6) / (height - 12)));
}
/// <summary>
/// Returns the RGB color from a specific position of the HUE scale.
/// </summary>
/// <param name="y">The vertical position from up to bottom.</param>
/// <param name="height">Total height of the scale.</param>
/// <param name="sat">Current saturation of the hue scale.</param>
/// <returns></returns>
public Color PickHuePixelColor(int y, int height, double sat)
{
if (y <= 6 || height - y <= 6)
{
return(Colors.Transparent);
}
return(ColorConverters.HueSaturation(2 * Math.PI - ((double)y - 6) / (height - 12) * (2 * Math.PI),
sat / 100));
}
/// <summary>
/// Returns the RGB color from a specific position of the outside wheel.
/// </summary>
/// <param name="x">The horizontal position from left to right.</param>
/// <param name="y">The vertical position from up to bottom.</param>
/// <param name="outerRadius">Outer radius of the outside wheel.</param>
/// <param name="innerRadius">Inner radius of the outside wheel.</param>
/// <returns></returns>
public Color PickOutsideWheelPixelColor(int x, int y, int outerRadius, int innerRadius)
{
var distanceFromCenter = Math.Sqrt(Math.Pow(x - outerRadius, 2) + Math.Pow(y - outerRadius, 2));
if (distanceFromCenter > outerRadius || distanceFromCenter < innerRadius - 2)
{
return(Colors.Transparent);
}
var angle = Math.Atan2(y - outerRadius, x - outerRadius) + Math.PI / 2;
if (angle < 0)
{
angle += 2 * Math.PI;
}
return(ColorConverters.HueSaturation(
Math.Round(angle / ((double)1 / 18 * Math.PI), MidpointRounding.AwayFromZero) *
((double)1 / 18 * Math.PI), 1));
}
/// <summary>
/// Returns the RGB color from a specific position of the main wheel.
/// </summary>
/// <param name="x">The horizontal position from left to right.</param>
/// <param name="y">The vertical position from up to bottom.</param>
/// <param name="radius">The radius from the wheel.</param>
/// <param name="colorTemperature">Color wheel mode.</param>
/// <returns></returns>
public Color PickWheelPixelColor(int x, int y, int radius, bool colorTemperature)
{
if (colorTemperature)
{
return(ColorConverters.ColorTemperatue((int)Math.Round((1 - (double)y / (2 * radius)) * 4500 + 2000)));
}
var distanceFromCenter = Math.Sqrt(Math.Pow(x - radius, 2) + Math.Pow(y - radius, 2));
if (distanceFromCenter > radius)
{
return(Colors.Transparent);
}
var angle = Math.Atan2(y - radius, x - radius) + Math.PI / 2;
if (angle < 0)
{
angle += 2 * Math.PI;
}
return(ColorConverters.HueSaturation(angle, distanceFromCenter / radius));
}
