public void Test_S1IntervalTestBase_ConstructorsAndAccessors()
{
// Spot-check the constructors and accessors.
Assert.Equal(0, quad12.Lo);
Assert.Equal(quad12.Hi, Math.PI);
Assert.Equal(quad34[0], Math.PI);
Assert.Equal(0, quad34[1]);
Assert.Equal(quad34.Bounds(), new R2Point(Math.PI, 0).Bounds());
Assert.Equal(pi.Lo, Math.PI);
Assert.Equal(pi.Hi, Math.PI);
// Check that [-Pi, -Pi] is normalized to [Pi, Pi].
Assert.Equal(mipi.Lo, Math.PI);
Assert.Equal(mipi.Hi, Math.PI);
Assert.Equal(quad23.Lo, S2.M_PI_2);
Assert.Equal(quad23.Hi, -S2.M_PI_2);
// Check that the default S1Interval is identical to Empty().
S1Interval default_empty = S1Interval.Empty;
Assert.True(default_empty.IsValid());
Assert.True(default_empty.IsEmpty());
Assert.Equal(empty.Lo, default_empty.Lo);
Assert.Equal(empty.Hi, default_empty.Hi);
}
public void Test_S1IntervalTestBase_SimplePredicates()
{
// is_valid(), IsEmpty, IsFull, IsInverted
Assert.True(zero.IsValid() && !zero.IsEmpty() && !zero.IsFull());
Assert.True(empty.IsValid() && empty.IsEmpty() && !empty.IsFull());
Assert.True(empty.IsInverted());
Assert.True(full.IsValid() && !full.IsEmpty() && full.IsFull());
Assert.True(!quad12.IsEmpty() && !quad12.IsFull() && !quad12.IsInverted());
Assert.True(!quad23.IsEmpty() && !quad23.IsFull() && quad23.IsInverted());
Assert.True(pi.IsValid() && !pi.IsEmpty() && !pi.IsInverted());
Assert.True(mipi.IsValid() && !mipi.IsEmpty() && !mipi.IsInverted());
}
// Returns the minimum distance from X to the latitude line segment defined by
// the given latitude and longitude interval.
private static S1Angle GetDistance(S2LatLng x, S1Angle lat, S1Interval interval)
{
Assert.True(x.IsValid());
Assert.True(interval.IsValid());
// Is X inside the longitude interval?
if (interval.Contains(x.LngRadians))
{
return(S1Angle.FromRadians((x.Lat() - lat).Abs()));
}
// Return the distance to the closer endpoint.
return(new[] { x.GetDistance(new S2LatLng(lat, S1Angle.FromRadians(interval.Lo))),
x.GetDistance(new S2LatLng(lat, S1Angle.FromRadians(interval.Hi))) }.Min());
}
