private bool loopsEqual(S2Loop a, S2Loop b, double maxError)
{
// Return true if two loops have the same cyclic vertex sequence.
if (a.NumVertices != b.NumVertices)
{
return(false);
}
for (var offset = 0; offset < a.NumVertices; ++offset)
{
if (S2.ApproxEquals(a.Vertex(offset), b.Vertex(0), maxError))
{
var success = true;
for (var i = 0; i < a.NumVertices; ++i)
{
if (!S2.ApproxEquals(a.Vertex(i + offset), b.Vertex(i), maxError))
{
success = false;
break;
}
}
if (success)
{
return(true);
}
// Otherwise continue looping. There may be more than one candidate
// starting offset since vertices are only matched approximately.
}
}
return(false);
}
private void assertPointApproximatelyEquals(
S2Loop s2Loop, int vertexIndex, double lat, double lng, double error)
{
var latLng = new S2LatLng(s2Loop.Vertex(vertexIndex));
assertDoubleNear(latLng.LatDegrees, lat, error);
assertDoubleNear(latLng.LngDegrees, lng, error);
}
private S2Loop rotate(S2Loop loop)
{
var vertices = new List<S2Point>();
for (var i = 1; i <= loop.NumVertices; ++i)
{
vertices.Add(loop.Vertex(i));
}
return new S2Loop(vertices);
}
private S2Loop rotate(S2Loop loop)
{
var vertices = new List <S2Point>();
for (var i = 1; i <= loop.NumVertices; ++i)
{
vertices.Add(loop.Vertex(i));
}
return(new S2Loop(vertices));
}
private static bool LoopHasVertex(S2Loop loop, S2Point p)
{
for (int i = 0; i < loop.NumVertices; ++i)
{
if (loop.Vertex(i) == p)
{
return(true);
}
}
return(false);
}
public void testBounds()
{
assertTrue(candyCane.RectBound.Lng.IsFull);
assertTrue(candyCane.RectBound.LatLo.Degrees < -20);
assertTrue(candyCane.RectBound.LatHi.Degrees > 10);
assertTrue(smallNeCw.RectBound.IsFull);
assertEquals(arctic80.RectBound,
new S2LatLngRect(S2LatLng.FromDegrees(80, -180), S2LatLng.FromDegrees(90, 180)));
assertEquals(antarctic80.RectBound,
new S2LatLngRect(S2LatLng.FromDegrees(-90, -180), S2LatLng.FromDegrees(-80, 180)));
arctic80.Invert();
// The highest latitude of each edge is attained at its midpoint.
var mid = (arctic80.Vertex(0) + arctic80.Vertex(1)) * 0.5;
assertDoubleNear(arctic80.RectBound.LatHi.Radians, new S2LatLng(mid).Lat.Radians);
arctic80.Invert();
assertTrue(southHemi.RectBound.Lng.IsFull);
assertEquals(southHemi.RectBound.Lat, new R1Interval(-S2.PiOver2, 0));
}
// Add a loop to the input geometry.
public void AddLoop(S2Loop loop)
{
bound_ = bound_.Union(loop.GetRectBound());
if (loop.IsEmptyOrFull())
{
// The empty and full loops consist of a single fake "vertex" that should
// not be added to our point collection.
return;
}
for (int i = 0; i < loop.NumVertices; ++i)
{
points_.Add(loop.Vertex(i));
}
}
private bool loopsEqual(S2Loop a, S2Loop b, double maxError)
{
// Return true if two loops have the same cyclic vertex sequence.
if (a.NumVertices != b.NumVertices)
{
return false;
}
for (var offset = 0; offset < a.NumVertices; ++offset)
{
if (S2.ApproxEquals(a.Vertex(offset), b.Vertex(0), maxError))
{
var success = true;
for (var i = 0; i < a.NumVertices; ++i)
{
if (!S2.ApproxEquals(a.Vertex(i + offset), b.Vertex(i), maxError))
{
success = false;
break;
}
}
if (success)
{
return true;
}
// Otherwise continue looping. There may be more than one candidate
// starting offset since vertices are only matched approximately.
}
}
return false;
}
private void dumpCrossings(S2Loop loop)
{
Console.WriteLine("Ortho(v1): " + S2.Ortho(loop.Vertex(1)));
Console.WriteLine("Contains(kOrigin): {0}\n", loop.Contains(S2.Origin));
for (var i = 1; i <= loop.NumVertices; ++i)
{
var a = S2.Ortho(loop.Vertex(i));
var b = loop.Vertex(i - 1);
var c = loop.Vertex(i + 1);
var o = loop.Vertex(i);
Console.WriteLine("Vertex {0}: [%.17g, %.17g, %.17g], "
+ "%d%dR=%d, %d%d%d=%d, R%d%d=%d, inside: %b\n",
i,
loop.Vertex(i).X,
loop.Vertex(i).Y,
loop.Vertex(i).Z,
i - 1,
i,
S2.RobustCcw(b, o, a),
i + 1,
i,
i - 1,
S2.RobustCcw(c, o, b),
i,
i + 1,
S2.RobustCcw(a, o, c),
S2.OrderedCcw(a, b, c, o));
}
for (var i = 0; i < loop.NumVertices + 2; ++i)
{
var orig = S2.Origin;
S2Point dest;
if (i < loop.NumVertices)
{
dest = loop.Vertex(i);
Console.WriteLine("Origin->{0} crosses:", i);
}
else
{
dest = new S2Point(0, 0, 1);
if (i == loop.NumVertices + 1)
{
orig = loop.Vertex(1);
}
Console.WriteLine("Case {0}:", i);
}
for (var j = 0; j < loop.NumVertices; ++j)
{
Console.WriteLine(
" " + S2EdgeUtil.EdgeOrVertexCrossing(orig, dest, loop.Vertex(j), loop.Vertex(j + 1)));
}
Console.WriteLine();
}
for (var i = 0; i <= 2; i += 2)
{
Console.WriteLine("Origin->v1 crossing v{0}->v1: ", i);
var a = S2.Ortho(loop.Vertex(1));
var b = loop.Vertex(i);
var c = S2.Origin;
var o = loop.Vertex(1);
Console.WriteLine("{0}1R={1}, M1{2}={3}, R1M={4}, crosses: {5}\n",
i,
S2.RobustCcw(b, o, a),
i,
S2.RobustCcw(c, o, b),
S2.RobustCcw(a, o, c),
S2EdgeUtil.EdgeOrVertexCrossing(c, o, b, a));
}
}
private void assertPointApproximatelyEquals(
S2Loop s2Loop, int vertexIndex, double lat, double lng, double error)
{
var latLng = new S2LatLng(s2Loop.Vertex(vertexIndex));
assertDoubleNear(latLng.LatDegrees, lat, error);
assertDoubleNear(latLng.LngDegrees, lng, error);
}
private void dumpCrossings(S2Loop loop)
{
Console.WriteLine("Ortho(v1): " + S2.Ortho(loop.Vertex(1)));
Console.WriteLine("Contains(kOrigin): {0}\n", loop.Contains(S2.Origin));
for (var i = 1; i <= loop.NumVertices; ++i)
{
var a = S2.Ortho(loop.Vertex(i));
var b = loop.Vertex(i - 1);
var c = loop.Vertex(i + 1);
var o = loop.Vertex(i);
Console.WriteLine("Vertex {0}: [%.17g, %.17g, %.17g], "
+ "%d%dR=%d, %d%d%d=%d, R%d%d=%d, inside: %b\n",
i,
loop.Vertex(i).X,
loop.Vertex(i).Y,
loop.Vertex(i).Z,
i - 1,
i,
S2.RobustCcw(b, o, a),
i + 1,
i,
i - 1,
S2.RobustCcw(c, o, b),
i,
i + 1,
S2.RobustCcw(a, o, c),
S2.OrderedCcw(a, b, c, o));
}
for (var i = 0; i < loop.NumVertices + 2; ++i)
{
var orig = S2.Origin;
S2Point dest;
if (i < loop.NumVertices)
{
dest = loop.Vertex(i);
Console.WriteLine("Origin->{0} crosses:", i);
}
else
{
dest = new S2Point(0, 0, 1);
if (i == loop.NumVertices + 1)
{
orig = loop.Vertex(1);
}
Console.WriteLine("Case {0}:", i);
}
for (var j = 0; j < loop.NumVertices; ++j)
{
Console.WriteLine(
" " + S2EdgeUtil.EdgeOrVertexCrossing(orig, dest, loop.Vertex(j), loop.Vertex(j + 1)));
}
Console.WriteLine();
}
for (var i = 0; i <= 2; i += 2)
{
Console.WriteLine("Origin->v1 crossing v{0}->v1: ", i);
var a = S2.Ortho(loop.Vertex(1));
var b = loop.Vertex(i);
var c = S2.Origin;
var o = loop.Vertex(1);
Console.WriteLine("{0}1R={1}, M1{2}={3}, R1M={4}, crosses: {5}\n",
i,
S2.RobustCcw(b, o, a),
i,
S2.RobustCcw(c, o, b),
S2.RobustCcw(a, o, c),
S2EdgeUtil.EdgeOrVertexCrossing(c, o, b, a));
}
}
