/// <summary>
/// Creates a new <c>Polygon</c> without any islands, and with undefined insertion point.
/// </summary>
/// <param name="rm">The metrics for this polygon</param>
/// <param name="edge">The boundaries that define the outer perimeter of the polygon</param>
internal Polygon(RingMetrics rm, List <Face> edge)
: base(rm, edge)
{
Debug.Assert(rm.SignedArea > 0.0);
m_Islands = null;
m_Labels = null;
}
/// <summary>
/// Creates a new <c>Polygon</c> without any islands, and with undefined insertion point.
/// </summary>
/// <param name="rm">The metrics for this polygon</param>
/// <param name="edge">The boundaries that define the outer perimeter of the polygon</param>
internal Polygon(RingMetrics rm, List<Face> edge)
: base(rm, edge)
{
Debug.Assert(rm.SignedArea > 0.0);
m_Islands = null;
m_Labels = null;
}
/// <summary>
/// Constructor used by <c>Ring.Create</c>.
/// </summary>
/// <param name="edge">The dividers that define the perimeter of the ring</param>
protected Ring(RingMetrics metrics, List <Face> edge)
: base(metrics)
{
m_Edge = new IDivider[edge.Count];
m_Flag = 0;
for (int i = 0; i < m_Edge.Length; i++)
{
Face face = edge[i];
IDivider d = face.Divider;
// Check for a divider that's already marked as being totally built.
if (Topology.IsBuilt(d))
{
throw new Exception("Polygon - Wrong build status for component divider");
}
// Remember the divider and update polygon geometry
m_Edge[i] = d;
if (face.IsLeft)
{
d.Left = this;
}
else
{
d.Right = this;
}
}
}
/// <summary>
/// Creates a new <c>Ring</c> that's either a <see cref="Polygon"/> or an <see cref="Island"/>.
/// </summary>
/// <param name="edge">The faces that define the perimeter of the ring</param>
internal static Ring Create(List <Face> edge)
{
RingMetrics rm = new RingMetrics(edge);
if (rm.SignedArea <= 0.0)
{
return(new Island(rm, edge));
}
else
{
return(new Polygon(rm, edge));
}
}
/// <summary>
/// Copy constructor
/// </summary>
/// <param name="copy">The metrics to (shallow) copy</param>
protected RingMetrics(RingMetrics copy)
{
m_Area = copy.m_Area;
m_Window = copy.m_Window;
}
/// <summary>
/// Creates a new <c>Island</c> polygon.
/// </summary>
/// <param name="rm">The metrics for this island</param>
/// <param name="edge">The boundaries that define the exterior edge of the island,
/// arranged in a (counter?)-clockwise cycle.</param>
internal Island(RingMetrics rm, List <Face> edge)
: base(rm, edge)
{
Debug.Assert(rm.SignedArea <= 0.0);
m_Container = null;
}
/// <summary>
/// Copy constructor
/// </summary>
/// <param name="copy">The metrics to (shallow) copy</param>
protected RingMetrics(RingMetrics copy)
{
m_Area = copy.m_Area;
m_Window = copy.m_Window;
}
/// <summary>
/// Creates a new <c>Island</c> polygon.
/// </summary>
/// <param name="rm">The metrics for this island</param>
/// <param name="edge">The boundaries that define the exterior edge of the island,
/// arranged in a (counter?)-clockwise cycle.</param>
internal Island(RingMetrics rm, List<Face> edge)
: base(rm, edge)
{
Debug.Assert(rm.SignedArea <= 0.0);
m_Container = null;
}
