// todo: not cut by rhythm
private SliderTick[] GetBezierDiscreteBallData(double interval)
{
if (Math.Round(interval - _singleElapsedTime) >= 0)
{
return(Array.Empty <SliderTick>());
}
var totalLength = RawBezierLengthData.Sum();
var ticks = new List <SliderTick>();
for (int i = 1; i *interval < _singleElapsedTime; i++)
{
var offset = i * interval; // 当前tick的相对时间
if (Edges.Any(k => Math.Abs(k.Offset - _offset - offset) < 0.01))
{
continue;
}
var ratio = offset / _singleElapsedTime; // 相对整个滑条的时间比例，=距离比例
var relativeLen = totalLength * ratio; // 至滑条头的距离
var(index, lenInPart) = CalculateWhichPart(relativeLen); // can be optimized
var len = RawBezierLengthData[index];
var tickPoint = Bezier.CalcPoint((float)(lenInPart / len), RawGroupedBezierData[index]);
ticks.Add(new SliderTick(_offset + offset, tickPoint));
}
if (Repeat > 1)
{
var firstSingleCopy = ticks.ToArray();
for (int i = 2; i <= Repeat; i++)
{
var reverse = i % 2 == 0;
if (reverse)
{
ticks.AddRange(firstSingleCopy.Reverse().Select(k =>
new SliderTick((_singleElapsedTime - (k.Offset - _offset)) + (i - 1) * _singleElapsedTime + _offset,
k.Point)));
}
else
{
ticks.AddRange(firstSingleCopy.Select(k =>
new SliderTick(k.Offset + (i - 1) * _singleElapsedTime, k.Point)));
}
}
}
return(ticks.ToArray());
}