/// <summary>
/// Get the objects in this tree that intersect with the specified rectangle.
/// </summary>
/// <param name="searchRect">The rectangle to find objects in.</param>
internal List <T> GetObjects(PreciseRectangle searchRect)
{
List <T> results = new List <T>();
GetObjects(searchRect, ref results);
return(results);
}
/// <summary>
/// Get the objects in this tree that intersect with the specified rectangle.
/// </summary>
/// <param name="searchRect">The rectangle to find objects in.</param>
/// <param name="results">A reference to a list that will be populated with the results.</param>
internal void GetObjects(PreciseRectangle searchRect, ref List <T> results)
{
// We can't do anything if the results list doesn't exist
if (results != null)
{
if (searchRect.Contains(rect))
{
// If the search area completely contains this quad, just get every object this quad and all it's children have
GetAllObjects(ref results);
}
else if (searchRect.Intersects(rect))
{
// Otherwise, if the quad isn't fully contained, only add objects that intersect with the search rectangle
if (objects != null)
{
for (int i = 0; i < objects.Count; i++)
{
if (searchRect.Intersects(objects[i].Data.QuadBounds))
{
results.Add(objects[i].Data);
}
}
}
// Get the objects for the search rectangle from the children
if (childTL != null)
{
childTL.GetObjects(searchRect, ref results);
childTR.GetObjects(searchRect, ref results);
childBL.GetObjects(searchRect, ref results);
childBR.GetObjects(searchRect, ref results);
}
}
}
}
/// <summary>
/// Creates a QuadTree for the specified area.
/// </summary>
/// <param name="rect">The area this QuadTree object will encompass.</param>
public QuadTree(PreciseRectangle rect)
{
quadTreeRoot = new QuadTreeNode <T>(rect);
}
private QuadTreeNode(QuadTreeNode <T> parent, PreciseRectangle rect)
: this(rect) {
this.parent = parent;
}
/// <summary>
/// Creates a QuadTree for the specified area.
/// </summary>
/// <param name="x">The top-left position of the area rectangle.</param>
/// <param name="y">The top-right position of the area rectangle.</param>
/// <param name="width">The width of the area rectangle.</param>
/// <param name="height">The height of the area rectangle.</param>
public QuadTreeNode(double x, double y, double width, double height)
{
rect = new PreciseRectangle(x, y, width, height);
}
/// <summary>
/// Creates a QuadTree for the specified area.
/// </summary>
/// <param name="rect">The area this QuadTree object will encompass.</param>
public QuadTreeNode(PreciseRectangle rect)
{
this.rect = rect;
}
/// <summary>
/// Get the objects in this tree that intersect with the specified rectangle.
/// </summary>
/// <param name="rect">The rectangle to find objects in.</param>
/// <param name="results">A reference to a list that will be populated with the results.</param>
public void GetObjects(PreciseRectangle rect, ref List <T> results)
{
moveAllObjects();
quadTreeRoot.GetObjects(rect, ref results);
}
/// <summary>
/// Get the objects in this tree that intersect with the specified rectangle.
/// </summary>
/// <param name="rect">The rectangle to find objects in.</param>
public List <T> GetObjects(PreciseRectangle rect)
{
return(quadTreeRoot.GetObjects(rect));
}