public void GeneratesCorrectPath()
{
const float Radius = 10;
int pointsCount = new Random().Next(3, 20);
var poly = new RegularPolygon(Vector2.Zero, pointsCount, Radius, 0);
IReadOnlyList <PointF> points = poly.Flatten().ToArray()[0].Points.ToArray();
// calcualte baselineDistance
float baseline = Vector2.Distance(points[0], points[1]);
// all points are extact the same distance away from the center
for (int i = 0; i < points.Count; i++)
{
int j = i - 1;
if (i == 0)
{
j = points.Count - 1;
}
float actual = Vector2.Distance(points[i], points[j]);
Assert.Equal(baseline, actual, 3);
Assert.Equal(Radius, Vector2.Distance(Vector2.Zero, points[i]), 3);
}
}
public void AngleChangesOnePointToStartAtThatPosition()
{
const double TwoPI = 2 * Math.PI;
const float Radius = 10;
double anAngle = new Random().NextDouble() * TwoPI;
var poly = new RegularPolygon(Vector2.Zero, 3, Radius, (float)anAngle);
IReadOnlyList <PointF> points = poly.Flatten().ToArray()[0].Points;
IEnumerable <double> allAngles = points.Select(b => Math.Atan2(b.Y, b.X))
.Select(x => x < 0 ? x + TwoPI : x); // normalise it from +/- PI to 0 to TwoPI
Assert.Contains(allAngles, a => Math.Abs(a - anAngle) > 0.000001);
}