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using System;
using System.Collections.Generic;
using System.Text;
using OpenSim.Region.Environment.Scenes;
namespace OpenSim.Region.Environment.Types
{
public class BasicQuadTreeNode
{
private List<SceneObjectGroup> m_objects = new List<SceneObjectGroup>();
private BasicQuadTreeNode[] m_childNodes = null;
private BasicQuadTreeNode m_parent = null;
private short m_leftX;
private short m_leftY;
private short m_width;
private short m_height;
public BasicQuadTreeNode(BasicQuadTreeNode parent, short leftX, short leftY, short width, short height)
{
m_parent = parent;
m_leftX = leftX;
m_leftY = leftY;
m_width = width;
m_height = height;
}
public void AddObject(SceneObjectGroup obj)
{
if (m_childNodes == null)
{
if (!m_objects.Contains(obj))
{
m_objects.Add(obj);
}
}
else
{
if (obj.AbsolutePosition.X < (m_leftX + (m_width / 2)))
{
if (obj.AbsolutePosition.Y < (m_leftY + (m_height / 2)))
{
m_childNodes[0].AddObject(obj);
}
else
{
m_childNodes[2].AddObject(obj);
}
}
else
{
if (obj.AbsolutePosition.Y < (m_leftY + (m_height / 2)))
{
m_childNodes[1].AddObject(obj);
}
else
{
m_childNodes[3].AddObject(obj);
}
}
}
}
public void Subdivide()
{
if (m_childNodes == null)
{
m_childNodes = new BasicQuadTreeNode[4];
m_childNodes[0] = new BasicQuadTreeNode(this, m_leftX, m_leftY,(short) (m_width / 2), (short)( m_height / 2));
m_childNodes[1] = new BasicQuadTreeNode(this,(short)( m_leftX + (m_width / 2)), m_leftY,(short)( m_width / 2),(short) (m_height / 2));
m_childNodes[2] = new BasicQuadTreeNode(this, m_leftX, (short)( m_leftY + (m_height / 2)), (short)(m_width / 2),(short)( m_height / 2));
m_childNodes[3] = new BasicQuadTreeNode(this, (short)( m_leftX + (m_width / 2)),(short)( m_height + (m_height / 2)),(short)( m_width / 2), (short)(m_height / 2));
}
else
{
for (int i = 0; i < m_childNodes.Length; i++)
{
m_childNodes[i].Subdivide();
}
}
}
public List<SceneObjectGroup> GetObjectsFrom(int x, int y)
{
if (m_childNodes == null)
{
return m_objects;
}
else
{
if (x < (m_leftX + (m_width / 2)))
{
if (y < (m_leftY + (m_height / 2)))
{
return m_childNodes[0].GetObjectsFrom(x, y);
}
else
{
return m_childNodes[2].GetObjectsFrom(x, y);
}
}
else
{
if (y < (m_leftY + (m_height / 2)))
{
return m_childNodes[1].GetObjectsFrom(x, y);
}
else
{
return m_childNodes[3].GetObjectsFrom(x, y);
}
}
}
}
public void Update()
{
if (m_childNodes != null)
{
for (int i = 0; i < 4; i++)
{
m_childNodes[i].Update();
}
}
else
{
List<SceneObjectGroup> outBounds = new List<SceneObjectGroup>();
foreach (SceneObjectGroup group in m_objects)
{
if (((group.AbsolutePosition.X > m_leftX) && (group.AbsolutePosition.X < (m_leftX + m_width))) && ((group.AbsolutePosition.Y > m_leftY) && (group.AbsolutePosition.Y < (m_leftY + m_height))))
{
//still in bounds
}
else
{
outBounds.Add(group);
}
}
foreach (SceneObjectGroup removee in outBounds)
{
m_objects.Remove(removee);
if (m_parent != null)
{
m_parent.PassUp(removee);
}
}
outBounds.Clear();
}
}
public void PassUp(SceneObjectGroup group)
{
if (((group.AbsolutePosition.X > m_leftX) && (group.AbsolutePosition.X < (m_leftX + m_width))) && ((group.AbsolutePosition.Y > m_leftY) && (group.AbsolutePosition.Y < (m_leftY + m_height))))
{
this.AddObject(group);
}
else
{
if (m_parent != null)
{
m_parent.PassUp(group);
}
}
}
}
}
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