/// <summary>
/// <para>
/// Calculates the linear distance between your creature and another using
/// various API's defined by the Vector class.
/// </para>
/// </summary>
/// <param name="organismState">
/// The OrganismState object for the creature to
/// use when computing linear distance from you're creature.
/// </param>
/// <returns>
/// A System.Double representing the linear distance between your creature and another.
/// </returns>
public double DistanceTo(OrganismState organismState)
{
if (organismState == null)
{
throw new ArgumentNullException("organismState", "The argument 'organismState' cannot be null");
}
return(Vector.Subtract(Position, organismState.Position).Magnitude);
}
/// <summary>
/// Determines the facing of the creature based on the movement
/// vector and update the creature's actual direction as a result.
/// </summary>
private void SetBitmapDirection()
{
if (IsImmutable)
{
throw new GameEngineException("Object is immutable.");
}
if (CurrentMoveToAction != null)
{
var direction = Vector.Subtract(CurrentMoveToAction.MovementVector.Destination,
currentPosition);
var unitVector = direction.GetUnitVector();
var angle = Math.Acos(unitVector.X);
if (unitVector.Y < 0)
{
angle = 6.2831853 - angle;
}
// convert radians to degrees
ActualDirection = (int)((angle / 6.283185) * 360);
}
}
