/// <summary>
/// Generates a value corresponding to a LED by analyzing the screen
/// </summary>
/// <param name="ledIndex">index of the LED</param>
/// <param name="data">The entire byte array corresponding to each pixel of the screen</param>
/// <param name="positions">The position on the screen to analyze</param>
/// <returns>a LED</returns>
private Led GenerateLed(Target ledIndex, DataStream data, List<long> positions)
{
if (data == null)
throw new ArgumentNullException("data");
var result = new Led();
result.LedIndex = ledIndex;
if (positions.Count == 0)
{
result.Color = new Color(0, 0, 0);
return result;
}
var buffer = new byte[4];
var red = 0;
var green = 0;
var blue = 0;
var total = 0;
// colors average
foreach (var position in positions)
{
data.Position = position;
data.Read(buffer, 0, 4);
red += buffer[2];
green += buffer[1];
blue += buffer[0];
total++;
}
red /= total;
green /= total;
blue /= total;
// gamma correction
red = (byte)(Math.Pow(red / 255.0, 2) * 127.0 + 0.5);
green = (byte)(Math.Pow(green / 255.0, 2) * 127.0 + 0.5);
blue = (byte)(Math.Pow(blue / 255.0, 2) * 127.0 + 0.5);
result.Color = new Color((byte)red, (byte)green, (byte)blue);
return result;
}
/// <summary>
/// Generates a query to ask the Arduino to change the color of an LED
/// </summary>
/// <param name="led">LED with desired color</param>
/// <returns>The generated query</returns>
public static byte[] GenerateLedQuery(Led led)
{
if (led.Color == null)
led.Color = new Color(0, 0, 0);
return new[] { (byte)led.LedIndex, led.Color.Red, led.Color.Green, led.Color.Blue };
}
public void ShowColor()
{
this.CurrentArduinoColor = ApplicationSettings.GetSetting<Color>("CurrentColor");
this.CurrentArduinoBrightness = ApplicationSettings.GetSetting<byte>("CurrentBrightness");
var led = new Led();
led.LedIndex = Target.AllLeds;
led.Color = this.CurrentArduinoColor;
this.Bluetooth.Send(QueryManager.GenerateBrightnessQuery(this.CurrentArduinoBrightness));
this.Bluetooth.Send(QueryManager.GenerateLedQuery(led));
}