public void testConversion()
{
// Test special cases: poles, "date line"
assertDoubleNear(
new S2LatLng(S2LatLng.FromDegrees(90.0, 65.0).ToPoint()).Lat.Degrees, 90.0);
assertEquals(
new S2LatLng(S2LatLng.FromRadians(-S2.PiOver2, 1).ToPoint()).Lat.Radians, -S2.PiOver2);
assertDoubleNear(
Math.Abs(new S2LatLng(S2LatLng.FromDegrees(12.2, 180.0).ToPoint()).Lng.Degrees), 180.0);
assertEquals(
Math.Abs(new S2LatLng(S2LatLng.FromRadians(0.1, -S2.Pi).ToPoint()).Lng.Radians),
S2.Pi);
// Test a bunch of random points.
for (var i = 0; i < 100000; ++i)
{
var p = randomPoint();
assertTrue(S2.ApproxEquals(p, new S2LatLng(p).ToPoint()));
}
// Test generation from E5
var test = S2LatLng.FromE5(123456, 98765);
assertDoubleNear(test.Lat.Degrees, 1.23456);
assertDoubleNear(test.Lng.Degrees, 0.98765);
}
public void Test_E5()
{
for (var i = 0; i < kIters; i++)
{
var ll = S2LatLng.FromPoint(S2Testing.RandomPoint());
var ll_e5 = S2LatLng.FromE5(ll.Lat().E5(), ll.Lng().E5());
ExpectMaxDigits(ll_e5, 5);
}
}
public void Test_IntLatLngSnapFunction_SnapPoint()
{
for (int iter = 0; iter < 1000; ++iter)
{
// Test that IntLatLngSnapFunction does not modify points that were
// generated using the S2LatLng.From{E5,E6,E7} methods. This ensures
// that both functions are using bitwise-compatible conversion methods.
S2Point p = S2Testing.RandomPoint();
S2LatLng ll = new(p);
S2Point p5 = S2LatLng.FromE5(ll.Lat().E5(), ll.Lng().E5()).ToPoint();
Assert.Equal(p5, new IntLatLngSnapFunction(5).SnapPoint(p5));
S2Point p6 = S2LatLng.FromE6(ll.Lat().E6(), ll.Lng().E6()).ToPoint();
Assert.Equal(p6, new IntLatLngSnapFunction(6).SnapPoint(p6));
S2Point p7 = S2LatLng.FromE7(ll.Lat().E7(), ll.Lng().E7()).ToPoint();
Assert.Equal(p7, new IntLatLngSnapFunction(7).SnapPoint(p7));
// Make sure that we're not snapping using some lower exponent.
S2Point p7not6 = S2LatLng.FromE7(10 * ll.Lat().E6() + 1,
10 * ll.Lng().E6() + 1).ToPoint();
Assert.NotEqual(p7not6, new IntLatLngSnapFunction(6).SnapPoint(p7not6));
}
}
