public void DetermineCrossing_ParallelLines_ReturnsNaN(LineSegment line1, LineSegment line2)
{
// Call
Point2D result = Geometry2DHelper.DetermineLineIntersection(line1, line2);
// Assert
Assert.IsNaN(result.X);
Assert.IsNaN(result.Y);
}
public void DetermineCrossing_VariousScenariosWithCrossing_ReturnsExpectedResult(LineSegment line1,
LineSegment line2,
Point2D expectedResult)
{
// Call
Point2D result = Geometry2DHelper.DetermineLineIntersection(line1, line2);
// Assert
Assert.AreEqual(expectedResult, result);
}
public void DetermineCrossing_Line2Null_ThrowsArgumentNullException()
{
// Setup
var random = new Random(21);
var lineSegment = new LineSegment(new Point2D(random.NextDouble(), random.NextDouble()),
new Point2D(random.NextDouble(), random.NextDouble()));
// Call
TestDelegate call = () => Geometry2DHelper.DetermineLineIntersection(lineSegment, null);
// Assert
var exception = Assert.Throws <ArgumentNullException>(call);
Assert.AreEqual("line2", exception.ParamName);
}
/// <summary>
/// Calculates the balanced field length by determining the intersection between the distances covered by the rejected
/// and the continued take off.
/// </summary>
/// <param name="outputs">The collection of <see cref="AggregatedDistanceOutput"/> to determine the balanced field length for.</param>
/// <returns>An <see cref="BalancedFieldLength"/> containing the information at which balanced field length occurs.</returns>
/// <exception cref="ArgumentNullException">Thrown when <see cref="outputs"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentException">Thrown when <paramref name="outputs"/>
/// <list type="bullet">
/// <item>contains a duplicate definition for a certain failure speed,</item>
/// <item>is empty,</item>
/// <item>contains only one element.</item>
/// </list></exception>
/// <remarks>This method will sort <paramref name="outputs"/> in an ascending order based on the failure speed.
/// The intersection is determined based on this sorted list.</remarks>
public static BalancedFieldLength CalculateBalancedFieldLength(IEnumerable <AggregatedDistanceOutput> outputs)
{
if (outputs == null)
{
throw new ArgumentNullException(nameof(outputs));
}
IEnumerable <AggregatedDistanceOutput> sortedOutputs = SortOutputs(outputs);
if (sortedOutputs.Count() <= 1)
{
throw new ArgumentException(Resources.BalancedFieldLengthCalculator_Cannot_determine_crossing_from_empty_or_single_item_collection);
}
AggregatedDistanceOutput previousOutput = sortedOutputs.First();
for (int i = 1; i < sortedOutputs.Count(); i++)
{
AggregatedDistanceOutput currentOutput = sortedOutputs.ElementAt(i);
// Create line segments
var continuedTakeOffSegment = new LineSegment(new Point2D(previousOutput.FailureSpeed, previousOutput.ContinuedTakeOffDistance),
new Point2D(currentOutput.FailureSpeed, currentOutput.ContinuedTakeOffDistance));
var abortedTakeOffSegment = new LineSegment(new Point2D(previousOutput.FailureSpeed, previousOutput.AbortedTakeOffDistance),
new Point2D(currentOutput.FailureSpeed, currentOutput.AbortedTakeOffDistance));
// Determine whether lines cross
Point2D crossingPoint = Geometry2DHelper.DetermineLineIntersection(continuedTakeOffSegment, abortedTakeOffSegment);
// Determine if the result is valid
if (!double.IsNaN(crossingPoint.X) && !double.IsNaN(crossingPoint.Y))
{
double intersectionDistance = crossingPoint.Y;
return(new BalancedFieldLength(crossingPoint.X, intersectionDistance));
}
previousOutput = currentOutput;
}
return(new BalancedFieldLength(double.NaN, double.NaN));
}
