public void RTree_Range_Search_Test()
{
var nodeCount = 1000;
var randomPolygons = new HashSet <Polygon>();
for (int i = 0; i < nodeCount; i++)
{
randomPolygons.Add(getRandomPointOrPolygon());
}
var order = 5;
var tree = new RTree(order);
foreach (var polygon in randomPolygons)
{
tree.Insert(polygon);
}
//IEnumerable test
Assert.AreEqual(tree.Count, tree.Count());
var searchRectangle = getRandomPointOrPolygon().GetContainingRectangle();
var expectedIntersections = randomPolygons.Where(x => RectangleIntersection.FindIntersection(searchRectangle, x.GetContainingRectangle()) != null).ToList();
var actualIntersections = tree.RangeSearch(searchRectangle);
Assert.AreEqual(expectedIntersections.Count, actualIntersections.Count);
}
public void RTree_Stress_Test()
{
var nodeCount = 10000;
var randomPolygons = new HashSet <Polygon>();
for (int i = 0; i < nodeCount; i++)
{
randomPolygons.Add(getRandomPointOrPolygon());
}
var order = 5;
var tree = new RTree(order);
foreach (var polygon in randomPolygons)
{
tree.Insert(polygon);
}
//IEnumerable test
Assert.AreEqual(tree.Count, tree.Count());
foreach (var polygon in randomPolygons)
{
tree.Delete(polygon);
}
}
public void RTree_Insertion_Test()
{
var nodeCount = 1000;
var randomPolygons = new HashSet <Polygon>();
for (int i = 0; i < nodeCount; i++)
{
randomPolygons.Add(getRandomPointOrPolygon());
}
var order = 5;
var tree = new RTree(order);
int j = 0;
foreach (var polygon in randomPolygons)
{
tree.Insert(polygon);
//IEnumerable test
Assert.AreEqual(tree.Count, tree.Count());
//height should be similar to that of B+ tree.
//https://en.wikipedia.org/wiki/B-tree#Best_case_and_worst_case_heights
var theoreticalMaxHeight = Math.Ceiling(Math.Log((j + 2) / 2, (int)Math.Ceiling((double)order / 2))) + 1;
var actualMaxHeight = tree.Root.Height;
Assert.AreEqual(verifyHeightUniformityAndReturnHeight(tree.Root, order), actualMaxHeight);
Assert.IsTrue(actualMaxHeight <= theoreticalMaxHeight);
j++;
Assert.IsTrue(tree.Exists(polygon));
}
Assert.AreEqual(j, tree.Count);
}
public void RTree_Deletion_Test()
{
var nodeCount = 1000;
var randomPolygons = new HashSet <Polygon>();
for (int i = 0; i < nodeCount; i++)
{
randomPolygons.Add(getRandomPointOrPolygon());
}
var order = 5;
var tree = new RTree(order);
foreach (var polygon in randomPolygons)
{
tree.Insert(polygon);
}
//IEnumerable test
Assert.AreEqual(tree.Count, tree.Count());
int j = randomPolygons.Count;
foreach (var polygon in randomPolygons)
{
tree.Delete(polygon);
Assert.IsFalse(tree.Exists(polygon));
j--;
if (j > 0)
{
var actualMaxHeight = tree.Root.Height;
Assert.AreEqual(verifyHeightUniformityAndReturnHeight(tree.Root, order), actualMaxHeight);
Assert.AreEqual(j, tree.Count);
}
}
}
public void RTreeCanBeRecoveredFromDisk()
{
var filename = Path.GetTempFileName();
long indexId = 0;
// create the new storage manager
using (var storageManager = new DiskStorageManager(filename))
{
var options = new RTreeOptions()
{
Dimensions = 2,
EnsureTightMBRs = true,
TreeVariant = RTreeVariant.RStar,
FillFactor = 0.9
};
storageManager.DatafileSuffix = "data";
storageManager.IndexfileSuffix = "index";
storageManager.Overwrite = true;
storageManager.PageSize = 1024;
using (var rtree = new RTree <byte[]>(options, storageManager))
{
rtree.Add(new Circle(new Point(-8, 2), 4), DataHelpers.GenerateSomeBytes(0x123021));
rtree.Add(new Circle(new Point(0, 2), 4), DataHelpers.GenerateSomeBytes(0x723321));
rtree.Add(new Circle(new Point(8, 2), 4), DataHelpers.GenerateSomeBytes(0x325721));
rtree.Add(new Circle(new Point(-4, -4), 0), DataHelpers.GenerateSomeBytes(0x452910));
rtree.Add(new Circle(new Point(4, -4), 0), DataHelpers.GenerateSomeBytes(0x7290900));
// sanity check
Assert.Equal(5, rtree.Count());
indexId = rtree.Options.IndexIdentifier;
}
}
// recycle the storage manager
using (var storageManager = new DiskStorageManager(filename))
{
storageManager.DatafileSuffix = "data";
storageManager.IndexfileSuffix = "index";
storageManager.Overwrite = false;
storageManager.PageSize = 1024;
var options = new RTreeOptions(indexId)
{
Dimensions = 2,
EnsureTightMBRs = true,
TreeVariant = RTreeVariant.RStar,
FillFactor = 0.9
};
using (var rtree = new RTree <byte[]>(options, storageManager))
{
// make sure my objects are still there
Assert.Equal(5, rtree.Count());
// make sure they are still correct
var intersection = rtree.IntersectsWith(new Circle(new Point(4, -4), 4));
Assert.Equal(3, intersection.Count());
}
}
}