public void PutPointsOnStepLengthDistance_AfterFullCircle(
double stepLength,
double angleShiftForEachPoint, int amountOfFullCircles)
{
var spiral = new ArchimedeanSpiral(center, stepLength,
angleShiftForEachPoint);
var firstPoint = spiral.CalculateNextPoint();
var amountOfSubsteps = 2 * Math.PI / angleShiftForEachPoint;
amountOfSubsteps *= amountOfFullCircles;
Point secondPoint = new Point();
while (amountOfSubsteps-- > 0)
{
secondPoint = spiral.CalculateNextPoint();
}
var expectedSquaredDistance =
stepLength * stepLength *
amountOfFullCircles * amountOfFullCircles;
firstPoint.GetSquaredDistanceTo(secondPoint)
.Should().BeApproximately(expectedSquaredDistance, 0.0005,
$"two points differed by {amountOfFullCircles}*2PI must be " +
$"distanced by {amountOfFullCircles} lengths of spiral step");
}
public void ReturnCenter_AsFirstPoint(int x, int y)
{
var center = new Point(x, y);
var spiral = new ArchimedeanSpiral(center, stepLength, angleShiftForEachPoint);
spiral.CalculateNextPoint().Should().BeEquivalentTo(center,
"first point must be the center of the spiral");
}
