public void It_Returns_An_Point_Along_The_Ray(Vector expected, double amplitude)
{
// Arrange
Ray ray = new Ray(new Point3(-10, 5, 10), new Vector3(20, 10, -5));
// Act
Vector pointAlongTheRay = ray.OnRay(amplitude);
// Assert
pointAlongTheRay.Should().BeEquivalentTo(expected);
}
public void It_Returns_A_Point_At_The_T_Parameter()
{
// Arrange
Ray ray = new Ray(new Point3(0, 0, 0), new Vector3(-7, 10, -5));
var expectedPt = new Point3(-8.75, 12.5, -6.25);
// Act
var pt = ray.PointAt(1.25);
// Assert
pt.Should().BeEquivalentTo(expectedPt);
}
public void It_Returns_The_Distance_To_A_Point()
{
// Arrange
Ray ray = new Ray(new Point3(0, 0, 0), new Vector3(30, 45, 0));
var pt = new Point3(10, 20, 0);
const double distanceExpected = 2.7735009811261464;
// Act
double distance = ray.DistanceTo(pt);
// Assert
distance.Should().Be(distanceExpected);
}
public void It_Returns_The_Closest_Point()
{
// Arrange
Ray ray = new Ray(new Point3(0, 0, 0), new Vector3(30, 45, 0));
var pt = new Point3(10, 20, 0);
var expectedPt = new Point3(12.30769230769231, 18.461538461538463, 0);
// Act
var closestPt = ray.ClosestPoint(pt);
// Assert
closestPt.Should().BeEquivalentTo(expectedPt);
}
