/// <summary>
/// Determines if two <see cref="IDirectional2D"/>s are parallel up to a custom angular tolerance.
/// That is, if lines with those directions are within that angle of each other, the
/// <see cref="IDirectional2D"/>s are considered "parallel."
/// </summary>
public static bool IsParallelTo(this IDirectional2D direction1, IDirectional2D direction2, Angle tolerance)
{
var angle = direction1.Direction.SmallestAngleBetween(direction2.Direction).ToSignedAngle();
return(angle.EqualsWithinTolerance(Angle.Zero, tolerance));
}
public static bool IsPerpendicularTo(this IDirectional2D direction1, IDirectional2D direction2) => direction1.Direction.RotateQuarterTurn().IsParallelTo(direction2);
public static bool IsParallelTo(this IDirectional2D direction1, IDirectional2D direction2) => direction1.Direction.SmallestAngleBetween(direction2.Direction).EqualsZero();
