/// <summary>
/// Gets a unique set of identifiers that were selected on the screen.
/// </summary>
/// <param name="screenRectangle">The screen rectangle to select from.</param>
/// <returns></returns>
public IEnumerable <uint> GetIDsSelected(Rectangle screenRectangle)
{
int width = Buffer.Width;
int height = Buffer.Height;
int startX = MathFunctions.Clamp(screenRectangle.X / Scale, 0, width - 1);
int startY = MathFunctions.Clamp(screenRectangle.Y / Scale, 0, height - 1);
int endX = MathFunctions.Clamp(screenRectangle.Right / Scale, 0, width - 1);
int endY = MathFunctions.Clamp(screenRectangle.Bottom / Scale, 0, height - 1);
HashSet <uint> selected = new HashSet <uint>();
for (int x = startX; x <= endX; x++)
{
for (int y = startY; y <= endY; y++)
{
uint id = GameComponent.GlobalIDFromColor(colorBuffer[x + y * width]);
if (id == 0)
{
continue;
}
if (selected.Contains(id))
{
continue;
}
selected.Add(id);
yield return(id);
}
}
}