/// <summary>
/// Releases an island of this polygon. This gets done if the island has been
/// marked for deletion.
/// </summary>
/// <param name="i">The island to release</param>
internal void Release(Island i)
{
if (m_Islands == null)
{
throw new Exception("Attempt to release island, but polygon doesn't have any islands");
}
if (!m_Islands.Remove(i))
{
throw new Exception("Failed to remove island from enclosing polygon");
}
// Add the area of the island back to this polygon.
SetArea(Area + i.Area);
}
/// <summary>
/// Creates a new <c>FindIslandContainerQuery</c> (and executes it). The result of the query
/// can then be obtained through the <c>Result</c> property.
/// </summary>
/// <param name="index">The spatial index to search</param>
/// <param name="island">The island you want the container for</param>
internal FindIslandContainerQuery(ISpatialIndex index, Island island)
{
m_Island = island;
m_Result = null;
// Get the most easterly point in the island.
IPosition ep = m_Island.GetEastPoint();
// Shift the east point ONE MICRON further to the east, to ensure
// we don't pick up the interior of the island!
PointGeometry eg = PointGeometry.Create(ep);
m_EastPoint = new PointGeometry(eg.Easting.Microns + 1, eg.Northing.Microns);
IWindow w = new Window(m_EastPoint, m_EastPoint);
index.QueryWindow(w, SpatialType.Polygon, OnQueryHit);
}
/// <summary>
/// Relates this polygon to an island.
/// </summary>
/// <param name="island">The island to point to.</param>
/// <return>True if association successfully made.</return>
internal void ClaimIsland(Island island)
{
// Issue error if the inclusion of the island would reduce the
// area of this polygon to less than zero.
if (this.Area - island.Area < 0.0)
{
throw new Exception("AddIsland - wrong enclosing polygon");
}
// Adjust the area of this enclosing polygon
SetArea(this.Area - island.Area);
// Append the island to the list of islands known to this polygon
if (m_Islands == null)
{
m_Islands = new List <Island>(1);
}
m_Islands.Add(island);
// Define this polygon as the container for the island.
island.Container = this;
}
/// <summary>
/// Releases an island of this polygon. This gets done if the island has been
/// marked for deletion.
/// </summary>
/// <param name="i">The island to release</param>
internal void Release(Island i)
{
if (m_Islands==null)
throw new Exception("Attempt to release island, but polygon doesn't have any islands");
if (!m_Islands.Remove(i))
throw new Exception("Failed to remove island from enclosing polygon");
// Add the area of the island back to this polygon.
SetArea(Area + i.Area);
}
/// <summary>
/// Relates this polygon to an island.
/// </summary>
/// <param name="island">The island to point to.</param>
/// <return>True if association successfully made.</return>
internal void ClaimIsland(Island island)
{
// Issue error if the inclusion of the island would reduce the
// area of this polygon to less than zero.
if (this.Area - island.Area < 0.0)
throw new Exception("AddIsland - wrong enclosing polygon");
// Adjust the area of this enclosing polygon
SetArea(this.Area - island.Area);
// Append the island to the list of islands known to this polygon
if (m_Islands==null)
m_Islands = new List<Island>(1);
m_Islands.Add(island);
// Define this polygon as the container for the island.
island.Container = this;
}
