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- /*
- * Copyright (c) Contributors, http://opensimulator.org/
- * See CONTRIBUTORS.TXT for a full list of copyright holders.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * * Neither the name of the OpenSim Project nor the
- * names of its contributors may be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- using System;
- using System.Collections.Generic;
- 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;
- //private int m_quadNumber;
- private string m_quadID;
- public BasicQuadTreeNode(BasicQuadTreeNode parent, string quadID, short leftX, short leftY, short width,
- short height)
- {
- m_parent = parent;
- m_quadID = quadID;
- m_leftX = leftX;
- m_leftY = leftY;
- m_width = width;
- m_height = height;
- // Console.WriteLine("creating quadtree node " + m_quadID);
- }
- 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_quadID + "1/", m_leftX, m_leftY, (short) (m_width/2),
- (short) (m_height/2));
- m_childNodes[1] =
- new BasicQuadTreeNode(this, m_quadID + "2/", (short) (m_leftX + (m_width/2)), m_leftY,
- (short) (m_width/2), (short) (m_height/2));
- m_childNodes[2] =
- new BasicQuadTreeNode(this, m_quadID + "3/", m_leftX, (short) (m_leftY + (m_height/2)),
- (short) (m_width/2), (short) (m_height/2));
- m_childNodes[3] =
- new BasicQuadTreeNode(this, m_quadID + "4/", (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(float x, float y)
- {
- if (m_childNodes == null)
- {
- return new List<SceneObjectGroup>(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 List<SceneObjectGroup> GetObjectsFrom(string nodeName)
- {
- if (nodeName == m_quadID)
- {
- return new List<SceneObjectGroup>(m_objects);
- }
- else if (m_childNodes != null)
- {
- for (int i = 0; i < 4; i++)
- {
- List<SceneObjectGroup> retVal;
- retVal = m_childNodes[i].GetObjectsFrom(nodeName);
- if (retVal != null)
- {
- return retVal;
- }
- }
- }
- return null;
- }
- public string GetNodeID(float x, float y)
- {
- if (m_childNodes == null)
- {
- return m_quadID;
- }
- else
- {
- if (x < m_leftX + (m_width/2))
- {
- if (y < m_leftY + (m_height/2))
- {
- return m_childNodes[0].GetNodeID(x, y);
- }
- else
- {
- return m_childNodes[2].GetNodeID(x, y);
- }
- }
- else
- {
- if (y < m_leftY + (m_height/2))
- {
- return m_childNodes[1].GetNodeID(x, y);
- }
- else
- {
- return m_childNodes[3].GetNodeID(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))))
- {
- AddObject(group);
- }
- else
- {
- if (m_parent != null)
- {
- m_parent.PassUp(group);
- }
- }
- }
- public string[] GetNeighbours(string nodeName)
- {
- string[] retVal = new string[1];
- retVal[0] = String.Empty;
- return retVal;
- }
- }
- }
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