public void PrecisionModelToleranceTest()
{
for (Int32 i = 0; i < _values.Length; i++)
{
Assert.IsTrue(_defaultModel.Tolerance(_values[i]) > _values[i] * Math.Pow(10, -16));
Assert.IsTrue(_defaultModel.Tolerance(_values[i]) <= _values[i] * Math.Pow(10, -15));
Assert.IsTrue(_floatingModel.Tolerance(_values[i]) > _values[i] * Math.Pow(10, -16));
Assert.IsTrue(_floatingModel.Tolerance(_values[i]) <= _values[i] * Math.Pow(10, -15));
Assert.IsTrue(_floatingSingleModel.Tolerance(_values[i]) > _values[i] * Math.Pow(10, -6));
Assert.IsTrue(_floatingSingleModel.Tolerance(_values[i]) <= _values[i] * Math.Pow(10, -5));
Assert.AreEqual(0.0005, _fixedLargeModel1.Tolerance(_values[i]));
Assert.AreEqual(0.0000000000005, _fixedLargeModel2.Tolerance(_values[i]));
Assert.AreEqual(500, _fixedSmallModel1.Tolerance(_values[i]));
Assert.AreEqual(500000000000, _fixedSmallModel2.Tolerance(_values[i]));
}
}
/// <summary>
/// Computes the planar orientation of a polygon.
/// </summary>
/// <param name="shell">The coordinates of the polygon shell.</param>
/// <param name="precisionModel">The precision model.</param>
/// <returns>The orientation of the polygon. If the polygon is invalid <see cref="AEGIS.Orientation.Undefined" /> is returned.</returns>
/// <exception cref="System.ArgumentNullException">The shell is null.</exception>
public static Orientation Orientation(IEnumerable <Coordinate> shell, PrecisionModel precisionModel)
{
if (shell == null)
{
throw new ArgumentNullException(nameof(shell));
}
// check for polygon properties
IEnumerator <Coordinate> enumerator = shell.GetEnumerator();
Double sum = 0;
Int32 count = 1;
if (!enumerator.MoveNext())
{
return(AEGIS.Orientation.Undefined);
}
Coordinate first = enumerator.Current, previous = first, current = first;
while (enumerator.MoveNext())
{
current = enumerator.Current;
sum += (current.X - previous.X) * (current.Y + previous.Y);
count++;
previous = current;
}
if (count < 3)
{
return(AEGIS.Orientation.Undefined);
}
if (precisionModel == null)
{
precisionModel = PrecisionModel.Default;
}
if (!precisionModel.AreEqual(first, current))
{
sum += (first.X - current.X) * (first.Y + current.Y);
}
if (Math.Abs(sum) <= precisionModel.Tolerance(shell))
{
return(AEGIS.Orientation.Collinear);
}
return((sum > 0) ? AEGIS.Orientation.Clockwise : AEGIS.Orientation.Counterclockwise);
}