void SetupPath()
{
var tuple = VectorUtility.GetCircumCircle(Points);
(cx, cy, Radius) = tuple;
if (VectorUtility.IsLeft(Points))
{
Radius *= -1;
}
}
void CalcPoints()
{
if (Position.Count != 0)
{
throw new InvalidOperationException("Catmull was calculated twice!");
}
for (int i = 0; i < Order - 1; i++)
{
var t = 0d;
while (t < Step - 1)
{
var p1 = i >= 1 ? Points[i - 1] : Points[i];
var p2 = Points[i];
var p3 = i + 1 < Order ? Points[i + 1] : p2.Calc(1, p2.Calc(-1, p1));
var p4 = i + 2 < Order ? Points[i + 2] : p2.Calc(1, p3.Calc(-1, p2));
var pixels = new[] { p1, p2, p3, p4 }.ToList();
var p = VectorUtility.GetPoint(pixels, t);
Position.Add(p);
t += Step;
}
}
}
public OsuPixel PointAtDistance(double length)
{
var radius = length / Radius;
return(VectorUtility.Rotate(cx, cy, Points[0], radius));
}