/// <summary>
/// Get the direction as a <see cref="Vector2"/>
/// </summary>
/// <param name="dir"></param>
/// <returns></returns>
public static Vector2 ToVector2(this EDirection8 dir)
{
switch (dir)
{
case EDirection8.None:
return(Vector2.zero);
case EDirection8.Up:
return(Vector2.up);
case EDirection8.UpRight:
return(Vector2.up + Vector2.right);
case EDirection8.Right:
return(Vector2.right);
case EDirection8.DownRight:
return(Vector2.down + Vector2.right);
case EDirection8.Down:
return(Vector2.down);
case EDirection8.DownLeft:
return(Vector2.down + Vector2.left);
case EDirection8.Left:
return(Vector2.left);
case EDirection8.UpLeft:
return(Vector2.up + Vector2.left);
default:
throw new ArgumentOutOfRangeException("dir", dir, null);
}
}
/// <summary>
/// Converts a <see cref="EDirection8"/> to a <see cref="EDirection2"/>.
/// </summary>
/// <param name="dir8"></param>
/// <returns></returns>
public static EDirection2 To2(this EDirection8 dir8)
{
switch (dir8)
{
case EDirection8.None:
return(EDirection2.None);
case EDirection8.Up:
case EDirection8.Down:
return(EDirection2.Vertical);
case EDirection8.Right:
case EDirection8.Left:
return(EDirection2.Horizontal);
case EDirection8.DownRight:
case EDirection8.DownLeft:
case EDirection8.UpLeft:
case EDirection8.UpRight:
throw new InvalidEnumArgumentException("Direction cannot be diagonal");
default:
throw new ArgumentOutOfRangeException("dir8", dir8, null);
}
}
/// <summary>
/// Get the opposite <see cref="EDirection8"/> of the given value
/// </summary>
/// <param name="dir"></param>
/// <returns></returns>
public static EDirection8 Opposite(this EDirection8 dir)
{
if (dir == EDirection8.None)
{
return(EDirection8.None);
}
return((EDirection8)(((int)dir + 3) % (dir.Count() - 1) + 1));
}
/// <summary>
/// Converts an <see cref="EDirection8"/> to <see cref="EDirection4"/>. Throws an exception if given value is diagonal.
/// </summary>
/// <param name="dir8"></param>
/// <returns></returns>
public static EDirection4 To4(this EDirection8 dir8)
{
if (dir8 == EDirection8.None)
{
return(EDirection4.None);
}
if (((int)dir8).IsEven())
{
throw new InvalidEnumArgumentException("dir8", (int)dir8, dir8.GetType());
}
return((EDirection4)(((int)dir8 + 1) / 2));
}
/// <summary>
/// Check to see if both <see cref="EDirection8s"/> are opposite to each other
/// </summary>
/// <param name="lhs"></param>
/// <param name="rhs"></param>
/// <returns>True if opposite</returns>
public static bool IsOpposite(this EDirection8 lhs, EDirection8 rhs)
{
return(lhs != EDirection8.None && rhs != EDirection8.None && Math.Abs((int)lhs - (int)rhs) == 4);
}
