public void Test_S2CellUnion_DefaultConstructor()
{
var ids = new List <S2CellId>();
var empty = new S2CellUnion(ids);
Assert.True(empty.IsEmpty());
}
public void Test_S2CellUnion_FromBeginEnd()
{
// Since FromMinMax() is implemented in terms of FromBeginEnd(), we
// focus on test cases that generate an empty range.
S2CellId initial_id = S2CellId.FromFace(3);
// Test an empty range before the minimum S2CellId.
S2CellUnion cell_union = new(new List <S2CellId> {
initial_id
});
S2CellId id_begin = S2CellId.Begin(S2.kMaxCellLevel);
cell_union.InitFromBeginEnd(id_begin, id_begin);
Assert.True(cell_union.IsEmpty());
// Test an empty range after the maximum S2CellId.
cell_union = new S2CellUnion(new List <S2CellId> {
initial_id
});
S2CellId id_end = S2CellId.End(S2.kMaxCellLevel);
cell_union.InitFromBeginEnd(id_end, id_end);
Assert.True(cell_union.IsEmpty());
// Test the full sphere.
cell_union = S2CellUnion.FromBeginEnd(id_begin, id_end);
Assert.Equal(6, cell_union.Size());
foreach (S2CellId id in cell_union)
{
Assert.True(id.IsFace());
}
}
public void Test_S2ShapeIndexBufferedRegion_EmptyIndex()
{
// Test buffering an empty S2ShapeIndex.
var index = new MutableS2ShapeIndex();
var radius = new S1ChordAngle(S1Angle.FromDegrees(2));
var region = new S2ShapeIndexBufferedRegion(index, radius);
var coverer = new S2RegionCoverer();
S2CellUnion covering = coverer.GetCovering(region);
Assert.True(covering.IsEmpty());
}
