public void testGetLengthCentroid()
{
// Construct random great circles and divide them randomly into segments.
// Then make sure that the length and centroid are correct. Note that
// because of the way the centroid is computed, it does not matter how
// we split the great circle into segments.
for (var i = 0; i < 100; ++i)
{
// Choose a coordinate frame for the great circle.
var x = randomPoint();
var y = S2Point.Normalize(S2Point.CrossProd(x, randomPoint()));
var z = S2Point.Normalize(S2Point.CrossProd(x, y));
var vertices = new List <S2Point>();
for (double theta = 0; theta < 2 * S2.Pi; theta += Math.Pow(rand.NextDouble(), 10))
{
var p = (x * Math.Cos(theta)) + (y * Math.Sin(theta));
if (vertices.Count == 0 || !p.Equals(vertices[vertices.Count - 1]))
{
vertices.Add(p);
}
}
// Close the circle.
vertices.Add(vertices[0]);
var line = new S2Polyline(vertices);
var length = line.ArcLengthAngle;
assertTrue(Math.Abs(length.Radians - 2 * S2.Pi) < 2e-14);
}
}
public void testBasic()
{
var vertices = new List <S2Point>();
var empty = new S2Polyline(vertices);
assertEquals(empty.RectBound, S2LatLngRect.Empty);
}
public void testEqualsAndHashCode()
{
var vertices = new List <S2Point>();
vertices.Add(new S2Point(1, 0, 0));
vertices.Add(new S2Point(0, 1, 0));
vertices.Add(S2Point.Normalize(new S2Point(0, 1, 1)));
vertices.Add(new S2Point(0, 0, 1));
var line1 = new S2Polyline(vertices);
var line2 = new S2Polyline(vertices);
checkEqualsAndHashCodeMethods(line1, line2, true);
var moreVertices = new List <S2Point>(vertices);
moreVertices.RemoveAt(0);
var line3 = new S2Polyline(moreVertices);
checkEqualsAndHashCodeMethods(line1, line3, false);
checkEqualsAndHashCodeMethods(line1, null, false);
checkEqualsAndHashCodeMethods(line1, "", false);
}
public static string ToDebugString(this S2Polyline polyline)
{
if (polyline.NumVertices() > 0)
{
return(AppendVertices(polyline.VerticesClone(), polyline.NumVertices()));
}
return("");
}
// Add a polyline to the input geometry.
public void AddPolyline(S2Polyline polyline)
{
bound_ = bound_.Union(polyline.GetRectBound());
for (int i = 0; i < polyline.NumVertices(); ++i)
{
points_.Add(polyline.Vertex(i));
}
}
public void Test_MakePolyline_ValidInput()
{
Assert.True(MakePolyline("-20:150, -20:151, -19:150", out var polyline));
var expected = new S2Polyline(new[] {
S2LatLng.FromDegrees(-20, 150).ToPoint(),
S2LatLng.FromDegrees(-20, 151).ToPoint(),
S2LatLng.FromDegrees(-19, 150).ToPoint(),
});
Assert.True(polyline == expected);
}
// As above, but does not Debug.Assert-fail on invalid input. Returns true if
// conversion is successful.
public static bool MakePolyline(string str, out S2Polyline?polyline, S2Debug override_ = S2Debug.ALLOW)
{
polyline = null;
var vertices = new List <S2Point>();
if (!ParsePoints(str, vertices))
{
return(false);
}
polyline = new S2Polyline(vertices.ToArray(), override_);
return(true);
}
public void testMayIntersect()
{
var vertices = new List <S2Point>();
vertices.Add(S2Point.Normalize(new S2Point(1, -1.1, 0.8)));
vertices.Add(S2Point.Normalize(new S2Point(1, -0.8, 1.1)));
var line = new S2Polyline(vertices);
for (var face = 0; face < 6; ++face)
{
var cell = S2Cell.FromFacePosLevel(face, (byte)0, 0);
assertEquals(line.MayIntersect(cell), (face & 1) == 0);
}
}
private static void AddPolylineWithLabels(S2Polyline polyline, EdgeType edge_type,
Int32 label_begin, S2Builder builder, EdgeLabelMap edge_label_map)
{
for (int i = 0; i + 1 < polyline.NumVertices(); ++i)
{
Int32 label = label_begin + i;
builder.SetLabel(label);
// With undirected edges, reverse the direction of every other input edge.
int dir = edge_type == EdgeType.DIRECTED ? 1 : (i & 1);
builder.AddEdge(polyline.Vertex(i + (1 - dir)), polyline.Vertex(i + dir));
S2Point key = polyline.Vertex(i) + polyline.Vertex(i + 1);
edge_label_map[key].Add(label);
}
}
public void Test_IndexedS2PolylineLayer_AddsShape()
{
S2Builder builder = new(new Options());
MutableS2ShapeIndex index = new();
builder.StartLayer(new IndexedS2PolylineLayer(index));
string polyline_str = "0:0, 0:10";
builder.AddPolyline(MakePolylineOrDie(polyline_str));
Assert.True(builder.Build(out _));
Assert.Equal(1, index.NumShapeIds());
S2Polyline polyline = ((S2Polyline.Shape)
index.Shape(0)).Polyline;
Assert.Equal(polyline_str, polyline.ToDebugString());
}
public void testInterpolate()
{
var vertices = new List <S2Point>();
vertices.Add(new S2Point(1, 0, 0));
vertices.Add(new S2Point(0, 1, 0));
vertices.Add(S2Point.Normalize(new S2Point(0, 1, 1)));
vertices.Add(new S2Point(0, 0, 1));
var line = new S2Polyline(vertices);
assertEquals(line.Interpolate(-0.1), vertices[0]);
assertTrue(S2.ApproxEquals(
line.Interpolate(0.1), S2Point.Normalize(new S2Point(1, Math.Tan(0.2 * S2.Pi / 2), 0))));
assertTrue(S2.ApproxEquals(line.Interpolate(0.25), S2Point.Normalize(new S2Point(1, 1, 0))));
assertTrue(S2.ApproxEquals(line.Interpolate(0.5), vertices[1]));
assertTrue(S2.ApproxEquals(line.Interpolate(0.75), vertices[2]));
assertTrue(S2.ApproxEquals(line.Interpolate(1.1), vertices[3]));
}
public void testProject()
{
var latLngs = new List <S2Point>();
latLngs.Add(S2LatLng.FromDegrees(0, 0).ToPoint());
latLngs.Add(S2LatLng.FromDegrees(0, 1).ToPoint());
latLngs.Add(S2LatLng.FromDegrees(0, 2).ToPoint());
latLngs.Add(S2LatLng.FromDegrees(1, 2).ToPoint());
var line = new S2Polyline(latLngs);
var edgeIndex = -1;
S2Point testPoint = default(S2Point);
testPoint = S2LatLng.FromDegrees(0.5, -0.5).ToPoint();
edgeIndex = line.GetNearestEdgeIndex(testPoint);
assertTrue(S2.ApproxEquals(
line.ProjectToEdge(testPoint, edgeIndex), S2LatLng.FromDegrees(0, 0).ToPoint()));
assertEquals(0, edgeIndex);
testPoint = S2LatLng.FromDegrees(0.5, 0.5).ToPoint();
edgeIndex = line.GetNearestEdgeIndex(testPoint);
assertTrue(S2.ApproxEquals(
line.ProjectToEdge(testPoint, edgeIndex), S2LatLng.FromDegrees(0, 0.5).ToPoint()));
assertEquals(0, edgeIndex);
testPoint = S2LatLng.FromDegrees(0.5, 1).ToPoint();
edgeIndex = line.GetNearestEdgeIndex(testPoint);
assertTrue(S2.ApproxEquals(
line.ProjectToEdge(testPoint, edgeIndex), S2LatLng.FromDegrees(0, 1).ToPoint()));
assertEquals(0, edgeIndex);
testPoint = S2LatLng.FromDegrees(-0.5, 2.5).ToPoint();
edgeIndex = line.GetNearestEdgeIndex(testPoint);
assertTrue(S2.ApproxEquals(
line.ProjectToEdge(testPoint, edgeIndex), S2LatLng.FromDegrees(0, 2).ToPoint()));
assertEquals(1, edgeIndex);
testPoint = S2LatLng.FromDegrees(2, 2).ToPoint();
edgeIndex = line.GetNearestEdgeIndex(testPoint);
assertTrue(S2.ApproxEquals(
line.ProjectToEdge(testPoint, edgeIndex), S2LatLng.FromDegrees(1, 2).ToPoint()));
assertEquals(2, edgeIndex);
}
public void Test_S2RegionEncodeDecodeTest_S2Polyline()
{
var vertices = Array.Empty <S2Point>();
var polyline_empty = new S2Polyline(vertices);
var polyline_semi = new S2Polyline(new[]
{
S2LatLng.FromDegrees(0, 0),
S2LatLng.FromDegrees(0, 90),
S2LatLng.FromDegrees(0, 180),
});
var polyline_3segments = MakePolylineOrDie("0:0, 0:10, 10:20, 20:30");
var polyline = TestEncodeDecode(kEncodedPolylineEmpty, polyline_empty);
Assert.True(polyline_empty == polyline);
polyline = TestEncodeDecode(kEncodedPolylineSemiEquator, polyline_semi);
Assert.True(polyline_semi == polyline);
polyline = TestEncodeDecode(kEncodedPolyline3Segments, polyline_3segments);
Assert.True(polyline_3segments == polyline);
}
public void testEqualsAndHashCode()
{
var vertices = new List<S2Point>();
vertices.Add(new S2Point(1, 0, 0));
vertices.Add(new S2Point(0, 1, 0));
vertices.Add(S2Point.Normalize(new S2Point(0, 1, 1)));
vertices.Add(new S2Point(0, 0, 1));
var line1 = new S2Polyline(vertices);
var line2 = new S2Polyline(vertices);
checkEqualsAndHashCodeMethods(line1, line2, true);
var moreVertices = new List<S2Point>(vertices);
moreVertices.RemoveAt(0);
var line3 = new S2Polyline(moreVertices);
checkEqualsAndHashCodeMethods(line1, line3, false);
checkEqualsAndHashCodeMethods(line1, null, false);
checkEqualsAndHashCodeMethods(line1, "", false);
}
public void testGetLengthCentroid()
{
// Construct random great circles and divide them randomly into segments.
// Then make sure that the length and centroid are correct. Note that
// because of the way the centroid is computed, it does not matter how
// we split the great circle into segments.
for (var i = 0; i < 100; ++i)
{
// Choose a coordinate frame for the great circle.
var x = randomPoint();
var y = S2Point.Normalize(S2Point.CrossProd(x, randomPoint()));
var z = S2Point.Normalize(S2Point.CrossProd(x, y));
var vertices = new List<S2Point>();
for (double theta = 0; theta < 2*S2.Pi; theta += Math.Pow(rand.NextDouble(), 10))
{
var p = (x * Math.Cos(theta)) + (y * Math.Sin(theta));
if (vertices.Count == 0 || !p.Equals(vertices[vertices.Count - 1]))
{
vertices.Add(p);
}
}
// Close the circle.
vertices.Add(vertices[0]);
var line = new S2Polyline(vertices);
var length = line.ArcLengthAngle;
assertTrue(Math.Abs(length.Radians - 2*S2.Pi) < 2e-14);
}
}
public void testBasic()
{
var vertices = new List<S2Point>();
var empty = new S2Polyline(vertices);
assertEquals(empty.RectBound, S2LatLngRect.Empty);
}
public void testProject()
{
var latLngs = new List<S2Point>();
latLngs.Add(S2LatLng.FromDegrees(0, 0).ToPoint());
latLngs.Add(S2LatLng.FromDegrees(0, 1).ToPoint());
latLngs.Add(S2LatLng.FromDegrees(0, 2).ToPoint());
latLngs.Add(S2LatLng.FromDegrees(1, 2).ToPoint());
var line = new S2Polyline(latLngs);
var edgeIndex = -1;
S2Point testPoint = default(S2Point);
testPoint = S2LatLng.FromDegrees(0.5, -0.5).ToPoint();
edgeIndex = line.GetNearestEdgeIndex(testPoint);
assertTrue(S2.ApproxEquals(
line.ProjectToEdge(testPoint, edgeIndex), S2LatLng.FromDegrees(0, 0).ToPoint()));
assertEquals(0, edgeIndex);
testPoint = S2LatLng.FromDegrees(0.5, 0.5).ToPoint();
edgeIndex = line.GetNearestEdgeIndex(testPoint);
assertTrue(S2.ApproxEquals(
line.ProjectToEdge(testPoint, edgeIndex), S2LatLng.FromDegrees(0, 0.5).ToPoint()));
assertEquals(0, edgeIndex);
testPoint = S2LatLng.FromDegrees(0.5, 1).ToPoint();
edgeIndex = line.GetNearestEdgeIndex(testPoint);
assertTrue(S2.ApproxEquals(
line.ProjectToEdge(testPoint, edgeIndex), S2LatLng.FromDegrees(0, 1).ToPoint()));
assertEquals(0, edgeIndex);
testPoint = S2LatLng.FromDegrees(-0.5, 2.5).ToPoint();
edgeIndex = line.GetNearestEdgeIndex(testPoint);
assertTrue(S2.ApproxEquals(
line.ProjectToEdge(testPoint, edgeIndex), S2LatLng.FromDegrees(0, 2).ToPoint()));
assertEquals(1, edgeIndex);
testPoint = S2LatLng.FromDegrees(2, 2).ToPoint();
edgeIndex = line.GetNearestEdgeIndex(testPoint);
assertTrue(S2.ApproxEquals(
line.ProjectToEdge(testPoint, edgeIndex), S2LatLng.FromDegrees(1, 2).ToPoint()));
assertEquals(2, edgeIndex);
}
public void testMayIntersect()
{
var vertices = new List<S2Point>();
vertices.Add(S2Point.Normalize(new S2Point(1, -1.1, 0.8)));
vertices.Add(S2Point.Normalize(new S2Point(1, -0.8, 1.1)));
var line = new S2Polyline(vertices);
for (var face = 0; face < 6; ++face)
{
var cell = S2Cell.FromFacePosLevel(face, (byte)0, 0);
assertEquals(line.MayIntersect(cell), (face & 1) == 0);
}
}
public void testInterpolate()
{
var vertices = new List<S2Point>();
vertices.Add(new S2Point(1, 0, 0));
vertices.Add(new S2Point(0, 1, 0));
vertices.Add(S2Point.Normalize(new S2Point(0, 1, 1)));
vertices.Add(new S2Point(0, 0, 1));
var line = new S2Polyline(vertices);
assertEquals(line.Interpolate(-0.1), vertices[0]);
assertTrue(S2.ApproxEquals(
line.Interpolate(0.1), S2Point.Normalize(new S2Point(1, Math.Tan(0.2*S2.Pi/2), 0))));
assertTrue(S2.ApproxEquals(line.Interpolate(0.25), S2Point.Normalize(new S2Point(1, 1, 0))));
assertTrue(S2.ApproxEquals(line.Interpolate(0.5), vertices[1]));
assertTrue(S2.ApproxEquals(line.Interpolate(0.75), vertices[2]));
assertTrue(S2.ApproxEquals(line.Interpolate(1.1), vertices[3]));
}
public void Test_EmptyPolyline()
{
var polyline = new S2Polyline();
Assert.Equal("", polyline.ToDebugString());
}
