/// <summary>
/// 混合处理，降采样和插值，不保留边界节点
/// </summary>
/// <param name="data">原始数据</param>
/// <param name="size">桶大小。如60/3600/86400</param>
/// <param name="offset">偏移量。时间不是对齐零点时使用</param>
/// <returns></returns>
public TimePoint[] Process(TimePoint[] data, Int32 size, Int32 offset = 0)
{
if (data == null || data.Length < 2)
{
return(data);
}
if (size <= 1)
{
return(data);
}
var xs = new Int64[data.Length];
for (var i = 0; i < data.Length; i++)
{
xs[i] = data[i].Time;
}
var buckets = SamplingHelper.SplitByFixedSize(xs, size, offset);
// 每个桶选择一个点作为代表
var sampled = new TimePoint[buckets.Length];
var last = 0;
for (var i = 0; i < buckets.Length; i++)
{
// 断层，插值
var item = buckets[i];
if (item.Start < 0)
{
// 取last用于插值起点，如果不存在，可以取0点
// 此时End指向下一个有效点，即使下一个桶也是断层
sampled[i].Time = i * size;
sampled[i].Value = Interpolation.Process(data, last, item.End, i);
continue;
}
TimePoint point = default;
var vs = 0.0;
for (var j = item.Start; j < item.End; j++)
{
vs += data[j].Value;
}
last = item.End - 1;
point.Value = vs / (item.End - item.Start);
// 对齐
point.Time = AlignMode switch
{
AlignModes.Right => (i + 1) * size - 1,
AlignModes.Center => data[(Int32)Math.Round((i + 0.5) * size)].Time,
_ => i * size,
};
sampled[i] = point;
}
return(sampled);
}
/// <summary>
/// 混合处理，降采样和插值
/// </summary>
/// <param name="data">原始数据</param>
/// <param name="size">桶大小。如60/3600/86400</param>
/// <param name="offset">偏移量。时间不是对齐零点时使用</param>
/// <returns></returns>
public TimePoint[] Process(TimePoint[] data, Int32 size, Int32 offset = 0)
{
if (data == null || data.Length < 2)
{
return(data);
}
if (size <= 1)
{
return(data);
}
var xs = new Int64[data.Length];
for (var i = 0; i < data.Length; i++)
{
xs[i] = data[i].Time;
}
var buckets = SamplingHelper.SplitByFixedSize(xs, size, offset);
// 每个桶选择一个点作为代表
var sampled = new TimePoint[buckets.Length];
var last = 0;
for (var i = 0; i < buckets.Length; i++)
{
// 断层，插值
var b = buckets[i];
if (b.Start < 0)
{
sampled[i].Time = i * size;
sampled[i].Value = Interpolation.Process(data, last, b.End, i);
continue;
}
TimePoint point = default;
var vs = 0.0;
for (var j = b.Start; j < b.End; j++)
{
vs += data[j].Value;
}
last = b.End - 1;
point.Value = vs / (b.End - b.Start);
// 对齐
switch (AlignMode)
{
case AlignModes.Left:
default:
point.Time = i * size;
break;
case AlignModes.Right:
point.Time = (i + 1) * size - 1;
break;
case AlignModes.Center:
point.Time = data[(Int32)Math.Round((i + 0.5) * size)].Time;
break;
}
sampled[i] = point;
}
return(sampled);
}
