public Line(int index, MapLinedef linedef, Vec2F start, Vec2F end, Side front,
Side back = null)
{
Index = index;
Front = front;
Back = new Optional <Side>(back);
Segment = new Seg2F(start, end);
Unpegged = ToUnpegged(linedef);
front.Line = this;
if (back != null)
{
back.Line = this;
}
}
/// <summary>
/// Checks if the upper flag is set on this.
/// </summary>
/// <param name="unpegged">The unpegged value.</param>
/// <returns>True if it has the upper flag set.</returns>
public static bool HasUpper(this Unpegged unpegged)
{
return(unpegged == Unpegged.Upper || unpegged == Unpegged.UpperAndLower);
}