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#   Copyright NumFOCUS
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# For testing itk PointsLocator in Python
import itk

# Create points on a plane
PointSetType = itk.PointSet[itk.F, 3]
pointset = PointSetType.New()
pointset.SetPoint(0, [0, 0, 0])
pointset.SetPoint(1, [0, 1, 0])
pointset.SetPoint(2, [1, 0, 0])
pointset.SetPoint(3, [1, 1, 0])

# Create PointsLocator
PointType = itk.Point[itk.F, 3]
PointsContainerType = itk.VectorContainer[itk.IT, PointType]
pl = itk.PointsLocator[PointsContainerType].New()
pl.SetPoints(pointset.GetPoints())
pl.Initialize()

# Query tree for one point
vl = itk.VectorContainer[itk.IT, itk.IT].New()
pl.FindClosestNPoints(pointset.GetPoint(0), 3, vl)
assert vl.Size() == 3
assert vl.GetElement(0) == 0
assert vl.GetElement(1) == 1
assert vl.GetElement(2) == 2

# Check points within radius
pl.FindPointsWithinRadius(pointset.GetPoint(0), 2, vl)
assert vl.Size() == 4

pl.FindPointsWithinRadius(pointset.GetPoint(0), 1.1, vl)
assert vl.Size() == 3
assert vl.GetElement(0) == 0
assert vl.GetElement(1) == 1
assert vl.GetElement(2) == 2