public OsuPixel PointAtDistance(double length)
{
switch (Order)
{
case 0: return(null);
case 1: return(Points[0]);
default: return(MathUtlity.PointAtDistance(Points, length));
}
}
internal void CalcStrain(CatchDifficultyHitObject lastHitObject, double timeRate)
{
var time = (HitObject.Offset - lastHitObject.HitObject.Offset) / timeRate;
var decay = Math.Pow(Constants.DecayBase, time / 1000d);
Offset = MathUtlity.Clamp(
lastHitObject.ScaledPosition + lastHitObject.Offset,
ScaledPosition - (Constants.NormalizedHitobjectRadius - _errorMargin),
ScaledPosition + (Constants.NormalizedHitobjectRadius - _errorMargin)) - ScaledPosition;
LastMovement = Math.Abs(ScaledPosition - lastHitObject.ScaledPosition + Offset - lastHitObject.Offset);
var addition = Math.Pow(LastMovement, 1.3) / 500;
if (ScaledPosition < lastHitObject.ScaledPosition)
{
LastMovement *= -1;
}
var additionBonus = 0d;
var sqrtTime = Math.Sqrt(Math.Max(time, 25));
if (Math.Abs(LastMovement) > 0.1)
{
if (Math.Abs(lastHitObject.LastMovement) > 0.1 &&
MathUtlity.Sign(LastMovement) != MathUtlity.Sign(lastHitObject.LastMovement))
{
var bonus = Constants.DirectionChangeBonus / sqrtTime;
var bonusFactor = Math.Min(_errorMargin, Math.Abs(LastMovement)) / _errorMargin;
addition += bonus * bonusFactor;
if (lastHitObject.HyperdashDistance <= 10)
{
additionBonus += 0.3 * bonusFactor;
}
}
addition += 7.5 * Math.Min(Math.Abs(LastMovement), Constants.NormalizedHitobjectRadius * 2) / (Constants.NormalizedHitobjectRadius * 6) / sqrtTime;
}
if (lastHitObject.HyperdashDistance <= 10)
{
if (!lastHitObject.HyperDash)
{
additionBonus += 1;
}
else
{
Offset = 0;
}
addition *= 1 + additionBonus * ((10 - lastHitObject.HyperdashDistance) / 10);
}
addition *= 850.0 / Math.Max(time, 25);
Strain = lastHitObject.Strain * decay + addition;
}
public static OsuPixel GetPoint(List <OsuPixel> points, double length)
{
List <double> xVals = new List <double>(), yVals = new List <double>();
foreach (var point in points)
{
xVals.Add(point.x);
yVals.Add(point.y);
}
var x = MathUtlity.Catmull(xVals, length);
var y = MathUtlity.Catmull(yVals, length);
return(new OsuPixel(x, y));
}
void UpdateHyperDashDistance()
{
double lastDirecetion = 0d;
double halfPlayerWidth = PlayerWidth / 2;
halfPlayerWidth *= 0.8;
double last = halfPlayerWidth;
for (int i = 0; i < DifficultyHitObjects.Count - 1; i++)
{
var cur = DifficultyHitObjects[i];
var nxt = DifficultyHitObjects[i + 1];
double direction;
if (nxt.HitObject.x > cur.HitObject.x)
{
direction = 1;
}
else
{
direction = -1;
}
double timeToNext = nxt.HitObject.Offset - cur.HitObject.Offset - 4.166667;
double distanceToNext = Math.Abs(nxt.HitObject.x - cur.HitObject.x);
if (Math.Abs(lastDirecetion - direction) == 0)
{
distanceToNext -= last;
}
else
{
distanceToNext -= halfPlayerWidth;
}
if (timeToNext < distanceToNext)
{
cur.HyperDash = true;
last = halfPlayerWidth;
}
else
{
cur.HyperdashDistance = timeToNext - distanceToNext;
last = MathUtlity.Clamp(cur.HyperdashDistance, 0, halfPlayerWidth);
}
lastDirecetion = direction;
}
}
void CalcBezier(List <OsuPixel> points)
{
var order = points.Count;
var step = 0.25 / Constants.SliderQuality / order;
double i = 0;
int n = order - 1;
while (i < 1 + step)
{
double x = 0, y = 0;
for (int p = 0; p < n + 1; p++)
{
var a = MathUtlity.Combine(p, n) * Math.Pow(1 - i, n - p) * Math.Pow(i, p);
x += a * points[p].x;
y += a * points[p].y;
}
var point = new OsuPixel(x, y);
Position.Add(point);
i += step;
}
}
void HandleHitObject()
{
var hitObjs = BaseBeatmap.HitObjects;
foreach (var hitObject in hitObjs)
{
CatchHitObject catchHitObject;
if (hitObject.HitObjectType == HitObjectTypes.Spinner || hitObject.HitObjectType == HitObjectTypes.BananaShower)
{
continue;
}
if (hitObject.HitObjectType == HitObjectTypes.Slider || hitObject.HitObjectType == HitObjectTypes.JuiceStream)
{
dynamic j;
if (hitObject is JuiceStream stream)
{
j = stream;
}
else
{
j = hitObject as Slider;
}
double repeat = j?.RepeatTime ?? throw new InvalidOperationException();
double pLen = j.Length;
var tmPt = GetAllTimePoints(hitObject.Offset);
ValueObserver <double> tickDistance = ValueObserver <double> .FromValue((100 * BaseBeatmap.SliderMultiplier) / BaseBeatmap.SliderTickRate);
if (BaseBeatmap.BeatmapVersion >= 8)
{
tickDistance /= (MathUtlity.Clamp(-1 * tmPt[CatchTimePointType.RawSpm], 10, 1000) / 100);
}
var curvePoints = new List <OsuPixel>(j.CurvePoints);
var sliderType = j.CurveType;
if (BaseBeatmap.BeatmapVersion <= 6 && curvePoints.Count >= 2)
{
if (sliderType == CurveTypes.Linear)
{
sliderType = CurveTypes.Bezier;
}
}
if (curvePoints.Count == 2)
{
if (Math.Abs((int)(j.Position.x) - curvePoints[0].x) == 0 && Math.Abs((int)(j.Position.y) - curvePoints[0].y) == 0 ||
(Math.Abs(curvePoints[0].x - curvePoints[1].x) == 0 && Math.Abs(curvePoints[0].y - curvePoints[1].y) == 0))
{
curvePoints.RemoveAt(0);
sliderType = CurveTypes.Linear;
}
}
j.curvePoints = curvePoints;
j.CurveType = sliderType;
catchHitObject = curvePoints.Count == 0 ? new CatchHitObject(hitObject) : new CatchHitObject(hitObject, tmPt, Difficulty, tickDistance);
}
else
{
catchHitObject = new CatchHitObject(hitObject);
}
CatchHitObjects.Add(catchHitObject);
MaxCombo += catchHitObject.GetCombo();
}
}