public void WalkTree()
{
const int radius = 3000;
var array = new KeyValuePair <PointD, CloneableType> [2 * radius];
for (int i = 0; i < array.Length; i++)
{
array[i] = new KeyValuePair <PointD, CloneableType>(
new PointD(i - radius, radius - i),
new CloneableType(String.Format("bar{0:D3} value", i)));
}
var tree = new QuadTree <CloneableType>(
new RectD(-2 * radius, -2 * radius, 4 * radius, 4 * radius));
Assert.AreEqual(tree, tree.RootNode.Tree);
Assert.AreEqual(1, tree.Nodes.Count);
// test adding elements
foreach (var pair in array)
{
tree.Add(pair.Key, pair.Value);
}
Assert.AreEqual(array.Length, tree.Count);
Assert.AreEqual(145, tree.Nodes.Count);
// test moving elements without hint node
PointD offset = new PointD(0.1, 0.1);
foreach (var pair in array)
{
tree.Move(pair.Key, pair.Key + offset);
}
// test moving elements with hint node
QuadTreeNode <CloneableType> node = null;
foreach (var pair in array)
{
node = tree.Move(pair.Key + offset, pair.Key, node);
}
Assert.AreEqual(array.Length, tree.Count);
Assert.AreEqual(145, tree.Nodes.Count);
// test finding elements
foreach (var pair in array)
{
CloneableType value;
Assert.IsTrue(tree.TryGetValue(pair.Key, out value));
Assert.AreEqual(pair.Value, value);
node = tree.FindNode(pair.Key);
Assert.AreEqual(tree, node.Tree);
Assert.IsTrue(node.Data.Contains(pair));
var valueNode = tree.FindNodeByValue(pair.Value);
Assert.AreEqual(node, valueNode);
}
// test finding elements in range
var range = new RectD(-radius, 0, 2 * radius, 2 * radius);
var elements = tree.FindRange(range);
Assert.AreEqual(radius + 1, elements.Count);
for (int i = 0; i <= radius; i++)
{
CloneableType value;
Assert.IsTrue(elements.TryGetValue(array[i].Key, out value));
Assert.AreEqual(array[i].Value, value);
}
// compare range search to BraidedTree
var braidedTree = new BraidedTree <PointD, CloneableType>(PointDComparerY.CompareExact);
foreach (var pair in array)
{
braidedTree.Add(pair);
}
// BraidedTree sorts by y-coordinates, so we must restrict x-coordinates
var braidedElements = braidedTree.FindRange(range.TopLeft, range.BottomRight,
n => (n.Key.X >= range.Left && n.Key.X <= range.Right));
Assert.AreEqual(elements.Count, braidedElements.Count);
foreach (var pair in elements)
{
CloneableType value;
Assert.IsTrue(braidedElements.TryGetValue(pair.Key, out value));
Assert.AreEqual(pair.Value, value);
}
// test element enumeration
foreach (var pair in tree)
{
CloneableType value;
Assert.IsTrue(braidedTree.TryGetValue(pair.Key, out value));
Assert.AreEqual(value, pair.Value);
braidedTree.Remove(pair.Key);
}
Assert.AreEqual(0, braidedTree.Count);
// test removing elements
foreach (var pair in array)
{
Assert.IsTrue(tree.Remove(pair.Key));
}
Assert.AreEqual(0, tree.Count);
Assert.AreEqual(1, tree.Nodes.Count);
}
/// <summary>
/// Handles the specified <see cref="EventPoint"/> that was just removed from the <see
/// cref="Schedule"/>.</summary>
/// <param name="e">
/// The <see cref="EventPoint"/> to handle.</param>
/// <remarks>
/// <b>HandleEvent</b> always updates the <see cref="SweepLine"/>, and possibly the <see
/// cref="Schedule"/> via <see cref="AddCrossing"/>.</remarks>
private void HandleEvent(EventPoint e)
{
BraidedTreeNode <Int32, Int32> node, previous = null, next = null;
Cursor = e.Shared;
bool adding = false;
// remove end point & crossing nodes
for (int i = 0; i < e.Locations.Count; i++)
{
switch (e.Locations[i])
{
case LineLocation.Start:
adding = true;
break;
case LineLocation.End:
node = SweepLine.FindNode(e.Lines[i]);
if (node == null)
{
ThrowHelper.ThrowInvalidOperationException(
Strings.SearchStructureCorrupted);
}
// remember surrounding lines
previous = node._previous;
next = node._next;
SweepLine.RemoveNode(node);
break;
case LineLocation.Between:
if (!SweepLine.Remove(e.Lines[i]))
{
ThrowHelper.ThrowInvalidOperationException(
Strings.SearchStructureCorrupted);
}
adding = true;
break;
}
}
if (!adding)
{
// intersect remaining neighbors of removed lines
if (previous._parent != null && next._parent != null)
{
AddCrossing(previous, next, e);
}
// record intersection event
var lines = e.Lines;
if (lines.Count < 2)
{
return;
}
/*
* The sweep line algorithm would normally record TWO intersections for
* overlapping lines that share the same lexicographic end point: one for the
* start point, and one for the end point. So when we encounter an event that
* contains only end points, we must check that its line segments arrive from at
* least two different directions, and only then record an intersection.
*/
double slope = Slopes[lines[0]];
for (int i = 1; i < lines.Count; i++)
{
if (slope != Slopes[lines[i]])
{
e.Normalize(Lines);
Crossings.Add(e);
break;
}
}
return;
}
// update remaining sweep line to prepare for insertion
var root = SweepLine.RootNode;
for (node = root._next; node != root; node = node._next)
{
int index = node.Key;
double slope = Slopes[index];
if (slope != Double.MaxValue)
{
PointD start = Lines[index].Start;
Positions[index] = slope * (Cursor.Y - start.Y) + start.X;
}
}
// (re-)insert start point & crossing nodes
previous = next = null;
for (int i = 0; i < e.Locations.Count; i++)
{
if (e.Locations[i] != LineLocation.End)
{
int index = e.Lines[i];
Positions[index] = Cursor.X;
SweepLine.TryAddNode(index, 0, out node);
// remember surrounding lines
if (previous == null)
{
previous = node._previous;
next = node._next;
}
}
}
// intersect outermost added lines with existing neighbors
if (previous._parent != null)
{
AddCrossing(previous, previous._next, e);
}
if (next._parent != null)
{
AddCrossing(next._previous, next, e);
}
// record intersection event
if (e.Lines.Count > 1)
{
e.Normalize(Lines);
Crossings.Add(e);
}
}
