public async Task SendSetColorMessage(int frameIndex, UdpClient client,
int transitionDuration = 0)
{
Rgb24 color = GetColor(frameIndex);
LifxSetColorMessage message = new LifxSetColorMessage
{
Kelvin = 3500, /* Neutral */
Duration = (uint)transitionDuration
}.SetRgb24(color);
message.Brightness = (ushort)Math.Min(ushort.MaxValue, message.Brightness * BrightnessFactor);
// Prevent a white flicker when blacking a bulb with transitions enabled.
if (message.Brightness == 0 && lastSetColor != null && transitionDuration > 0)
{
message.Hue = lastSetColor.Hue;
message.Saturation = lastSetColor.Saturation;
}
LifxPacket packet = new LifxPacket
{
FrameHeaderTagged = true,
FrameHeaderSource = 092985, // An arbitrary, unique value.
FrameAddressAcknowledgementRequired = false,
FrameAddressResponseRequired = false,
ProtocolHeaderType = LifxMessageType.SetColor,
Payload = message
};
using (MemoryStream data = new MemoryStream())
using (BinaryWriter writer = new BinaryWriter(data))
{
packet.Serialize(writer);
await client.SendAsync(data.ToArray(), (int)data.Length, EndPoint);
}
lastSetColor = message;
}
public static Rgb24 GetRgb24(this ILifxHsbkData data)
{
// Reference: https://en.wikipedia.org/wiki/HSL_and_HSV#From_HSV
float hue = data.GetHueDegrees();
float saturation = data.GetSaturationPercent();
float brightness = data.GetBrightnessPercent();
float chroma = brightness * saturation;
float huePrime = hue / 60f;
float x = chroma * (1f - Math.Abs(huePrime % 2 - 1));
var rgb1 = huePrime <= 1 ? (chroma, x, 0f)
: huePrime <= 2 ? (x, chroma, 0f)
: huePrime <= 3 ? (0f, chroma, x)
: huePrime <= 4 ? (0f, x, chroma)
: huePrime <= 5 ? (x, 0f, chroma)
: /* huePrime <= 6 */ (chroma, 0f, x);
float m = brightness - chroma;
return(new Rgb24(
r: (byte)Math.Round((rgb1.Item1 + m) * byte.MaxValue, 0),
g: (byte)Math.Round((rgb1.Item2 + m) * byte.MaxValue, 0),
b: (byte)Math.Round((rgb1.Item3 + m) * byte.MaxValue, 0)));
}
public static float GetSaturationPercent(this ILifxHsbkData data) => data.Saturation / (float)UInt16.MaxValue;
public static float GetBrightnessPercent(this ILifxHsbkData data) => data.Brightness / (float)UInt16.MaxValue;
public static float GetHueDegrees(this ILifxHsbkData data) => data.Hue / (float)UInt16.MaxValue * 360f;
