public static double Angle(this Rotation2Order4 @this)
{
switch (@this)
{
case Rotation2Order4.Rotation0:
return(0);
case Rotation2Order4.Rotation90:
return(Math.PI / 2);
case Rotation2Order4.Rotation180:
return(Math.PI);
case Rotation2Order4.Rotation270:
return(-Math.PI / 2);
default:
throw new InternalException("Illegal rotation!");
}
}
public static Vector2 ApplyInv(this Rotation2Order4 @this, Vector2 v)
{
switch (@this)
{
case Rotation2Order4.Rotation0:
return(v);
case Rotation2Order4.Rotation90:
return(new Vector2(v.Y, -v.X));
case Rotation2Order4.Rotation180:
return(-v);
case Rotation2Order4.Rotation270:
return(new Vector2(-v.Y, v.X));
default:
throw new InternalException("Illegal rotation!");
}
}
public static Rotation2Order4 Inv(this Rotation2Order4 @this)
{
switch (@this)
{
case Rotation2Order4.Rotation0:
return(Rotation2Order4.Rotation0);
case Rotation2Order4.Rotation90:
return(Rotation2Order4.Rotation270);
case Rotation2Order4.Rotation180:
return(Rotation2Order4.Rotation180);
case Rotation2Order4.Rotation270:
return(Rotation2Order4.Rotation90);
default:
throw new InternalException("Illegal rotation!");
}
}
public static Rotation2Order4 Compose(Rotation2Order4 x, Rotation2Order4 y)
{
return((Rotation2Order4)(((int)x + (int)y) % 4));
}