/// <summary>
/// Creates a child node, remembering it as as child of this node.
/// </summary>
/// <param name="childWindow">The spatial extent of the new child</param>
/// <returns>The created node is either an instance of <see cref="Node"/> (for
/// child nodes that are quite small), or a new (smaller) instance of
/// this class.</returns>
Node CreateChild(Extent childWindow)
{
// If the child is quite small, make it a leaf node (the number here
// means we effectively ignore the 3 low-order bytes in X & Y, meaning
// that a leaf node will cover approx 16x16 metres on the ground).
Node child;
if (childWindow.Width < SMALL && childWindow.Height < SMALL)
{
child = new Node(childWindow);
}
else
{
child = new RectangleIndex(childWindow);
}
if (m_Children == null)
{
m_Children = new List <Node>(1);
}
m_Children.Add(child);
return(child);
}
/// <summary>
/// Initializes a new instance of the <see cref="SpatialIndex"/> class
/// with nothing in it.
/// </summary>
public SpatialIndex()
{
Extent all = new Extent();
m_Points = new PointIndex();
m_Lines = new RectangleIndex(all);
m_Text = new RectangleIndex(all);
m_Polygons = new RectangleIndex(all);
}
/// <summary>
/// Creates a child node, remembering it as as child of this node.
/// </summary>
/// <param name="childWindow">The spatial extent of the new child</param>
/// <returns>The created node is either an instance of <see cref="Node"/> (for
/// child nodes that are quite small), or a new (smaller) instance of
/// this class.</returns>
Node CreateChild(Extent childWindow)
{
// If the child is quite small, make it a leaf node (the number here
// means we effectively ignore the 3 low-order bytes in X & Y, meaning
// that a leaf node will cover approx 16x16 metres on the ground).
Node child;
if (childWindow.Width < SMALL && childWindow.Height < SMALL)
child = new Node(childWindow);
else
child = new RectangleIndex(childWindow);
if (m_Children==null)
m_Children = new List<Node>(1);
m_Children.Add(child);
return child;
}
