public void Test_S2ShapeIndexRegion_GetRectBound()
{
var id = S2CellId.FromDebugString("3/0123012301230123012301230123");
// Add a polygon that is slightly smaller than the cell being tested.
MutableS2ShapeIndex index = new();
index.Add(NewPaddedCell(id, -kPadding));
S2LatLngRect cell_bound = new S2Cell(id).GetRectBound();
S2LatLngRect index_bound = index.MakeS2ShapeIndexRegion().GetRectBound();
Assert.Equal(index_bound, cell_bound);
}
public void Test_S2CellId_FromDebugString()
{
Assert.Equal(S2CellId.FromFace(3), S2CellId.FromDebugString("3/"));
Assert.Equal(S2CellId.FromFace(0).Child(2).Child(1),
S2CellId.FromDebugString("0/21"));
Assert.Equal(S2CellId.FromFace(4).RangeMin(),
S2CellId.FromDebugString("4/000000000000000000000000000000"));
Assert.Equal(S2CellId.None,
S2CellId.FromDebugString("4/0000000000000000000000000000000"));
Assert.Equal(S2CellId.None, S2CellId.FromDebugString(""));
Assert.Equal(S2CellId.None, S2CellId.FromDebugString("7/"));
Assert.Equal(S2CellId.None, S2CellId.FromDebugString(" /"));
Assert.Equal(S2CellId.None, S2CellId.FromDebugString("3:0"));
Assert.Equal(S2CellId.None, S2CellId.FromDebugString("3/ 12"));
Assert.Equal(S2CellId.None, S2CellId.FromDebugString("3/1241"));
}
public void Test_S2ShapeIndexRegion_GetCapBound()
{
var id = S2CellId.FromDebugString("3/0123012301230123012301230123");
// Add a polygon that is slightly smaller than the cell being tested.
MutableS2ShapeIndex index = new();
index.Add(NewPaddedCell(id, -kPadding));
S2Cap cell_bound = new S2Cell(id).GetCapBound();
S2Cap index_bound = index.MakeS2ShapeIndexRegion().GetCapBound();
Assert.True(index_bound.Contains(cell_bound));
// Note that S2CellUnion.GetCapBound returns a slightly larger bound than
// S2Cell.GetBound even when the cell union consists of a single S2CellId.
Assert.True(index_bound.RadiusAngle() <= 1.00001 * cell_bound.RadiusAngle());
}
public void Test_S2ShapeIndexRegion_IntersectsExactCell()
{
var target = S2CellId.FromDebugString("3/0123012301230123012301230123");
// Adds a polygon that exactly follows a cell boundary.
MutableS2ShapeIndex index = new();
index.Add(NewPaddedCell(target, 0.0));
var region = index.MakeS2ShapeIndexRegion();
// Check that the index intersects the cell and all of its neighbors.
List <S2CellId> ids = new(){ target };
target.AppendAllNeighbors(target.Level(), ids);
foreach (S2CellId id in ids)
{
Assert.True(region.MayIntersect(new S2Cell(id)));
}
}
public void Test_S2ShapeIndexRegion_IntersectsShrunkenCell()
{
var target = S2CellId.FromDebugString("3/0123012301230123012301230123");
// Add a polygon that is slightly smaller than the cell being tested.
MutableS2ShapeIndex index = new();
index.Add(NewPaddedCell(target, -kPadding));
var region = index.MakeS2ShapeIndexRegion();
// Check that the index intersects the cell itself, but not any of the
// neighboring cells.
Assert.True(region.MayIntersect(new S2Cell(target)));
var nbrs = new List <S2CellId>();
target.AppendAllNeighbors(target.Level(), nbrs);
foreach (var id in nbrs)
{
Assert.False(region.MayIntersect(new S2Cell(id)));
}
}
public void Test_S2ShapeIndexRegion_ContainsCellMultipleShapes()
{
Assert.True(false); //TODO
var id = S2CellId.FromDebugString("3/0123012301230123012301230123");
// Add a polygon that is slightly smaller than the cell being tested.
MutableS2ShapeIndex index = new();
index.Add(NewPaddedCell(id, -kPadding));
Assert.False(index.MakeS2ShapeIndexRegion().Contains(new S2Cell(id)));
// Add a second polygon that is slightly larger than the cell being tested.
// Note that Contains() should return true if *any* shape contains the cell.
index.Add(NewPaddedCell(id, kPadding));
Assert.True(index.MakeS2ShapeIndexRegion().Contains(new S2Cell(id)));
// Verify that all children of the cell are also contained.
for (var child = id.ChildBegin(); child != id.ChildEnd(); child = child.Next())
{
Assert.True(index.MakeS2ShapeIndexRegion().Contains(new S2Cell(child)));
}
}
private static S2CellId MakeCellId(string str) => S2CellId.FromDebugString(str);