private T FindNearestNeighbour(T point, double distance, BalancedKdTreeNode <T> node, Func <T, T, double> distanceFunc)
{
double minDistance = Math.Min(distance, distanceFunc(point, node.Point));
T result = node.Point;
if (node.LeftChild != null &&
!node.LeftChild.IsNilNode() &&
SpatialUtility.CircleRectangleIntersects(PointFunc(point), minDistance, node.LeftChild.MinimumBoundingBox))
{
var newPoint = FindNearestNeighbour(point, minDistance, node.LeftChild, distanceFunc);
if (distanceFunc(point, newPoint) < minDistance)
{
minDistance = distanceFunc(point, newPoint);
result = newPoint;
}
}
if (node.RightChild != null &&
!node.RightChild.IsNilNode() &&
SpatialUtility.CircleRectangleIntersects(PointFunc(point), minDistance, node.RightChild.MinimumBoundingBox))
{
var newPoint = FindNearestNeighbour(point, minDistance, node.RightChild, distanceFunc);
if (distanceFunc(point, newPoint) < minDistance)
{
minDistance = distanceFunc(point, newPoint);
result = newPoint;
}
}
return(result);
}
public void TestCircleRectangleIntersects()
{
// -------
// | |
// | |
// | |
// -------
BoundingBox rectangle = new BoundingBox(0, 0, 10, 20);
var radius = 5;
Point insideRectangle = new Point(5, 9);
Assert.AreEqual(true, SpatialUtility.CircleRectangleIntersects(insideRectangle, radius, rectangle));
Point topOfRectangle = new Point(5, 25.1);
Assert.AreEqual(false, SpatialUtility.CircleRectangleIntersects(topOfRectangle, radius, rectangle));
Point bottomOfRectangle = new Point(5, -6);
Assert.AreEqual(false, SpatialUtility.CircleRectangleIntersects(bottomOfRectangle, radius, rectangle));
Point topRightCorner = new Point(13, 24);
Assert.AreEqual(true, SpatialUtility.CircleRectangleIntersects(topRightCorner, radius, rectangle));
Point topRightCorner2 = new Point(13.1, 24);
Assert.AreEqual(false, SpatialUtility.CircleRectangleIntersects(topRightCorner2, radius, rectangle));
Point centerRectangle = new Point(5, 10);
Assert.AreEqual(false, SpatialUtility.IsAxisAlignedRectangleInsideCircle(centerRectangle, radius, rectangle));
Point insideRectangle2 = new Point(5.1, 10);
Assert.AreEqual(false, SpatialUtility.IsAxisAlignedRectangleInsideCircle(insideRectangle2, radius, rectangle));
Point insideRectangle3 = new Point(5.1, 10);
Assert.AreEqual(false, SpatialUtility.IsAxisAlignedRectangleInsideCircle(insideRectangle3, 11.19, rectangle));
Point insideRectangle4 = new Point(5, 10);
Assert.AreEqual(true, SpatialUtility.IsAxisAlignedRectangleInsideCircle(insideRectangle4, 11.19, rectangle));
Assert.AreEqual(Intersects, SpatialUtility.CalculateAxisAlignedRectangleRelationToCircle(insideRectangle, radius, rectangle));
Assert.AreEqual(Disjoint, SpatialUtility.CalculateAxisAlignedRectangleRelationToCircle(topOfRectangle, radius, rectangle));
Assert.AreEqual(Disjoint, SpatialUtility.CalculateAxisAlignedRectangleRelationToCircle(bottomOfRectangle, radius, rectangle));
Assert.AreEqual(Intersects, SpatialUtility.CalculateAxisAlignedRectangleRelationToCircle(topRightCorner, radius, rectangle));
Assert.AreEqual(Disjoint, SpatialUtility.CalculateAxisAlignedRectangleRelationToCircle(topRightCorner2, radius, rectangle));
Assert.AreEqual(Intersects, SpatialUtility.CalculateAxisAlignedRectangleRelationToCircle(centerRectangle, radius, rectangle));
Assert.AreEqual(Intersects, SpatialUtility.CalculateAxisAlignedRectangleRelationToCircle(insideRectangle2, radius, rectangle));
Assert.AreEqual(Intersects, SpatialUtility.CalculateAxisAlignedRectangleRelationToCircle(insideRectangle3, 11.19, rectangle));
Assert.AreEqual(Contained, SpatialUtility.CalculateAxisAlignedRectangleRelationToCircle(insideRectangle4, 11.19, rectangle));
}
