protected void RefreshMaxAndMinValue <TDataType>(OverLapWrapBuffer <TDataType> datas, int seriesIndex, int samplesAdded, bool removedDataInsideRange)
{
int newDataStartIndex = datas.Count - samplesAdded;
IList <TDataType> newDatas = datas.GetRange(newDataStartIndex, samplesAdded);
double newDataMax, newDataMin;
ParallelHandler.GetMaxAndMin(newDatas, out newDataMax, out newDataMin);
// 如果删除的点没有超过范围，则这些点不会影响最终Y轴的最大最小值
if (removedDataInsideRange)
{
// 如果Y轴新的最大值超过原来最大值，则新的最大值最大；如果Y轴新的最小值小于原来最小值，则新的最小值最小
if (newDataMax >= _maxYValues[seriesIndex])
{
_maxYValues[seriesIndex] = newDataMax;
}
if (newDataMin <= _minYValues[seriesIndex])
{
_minYValues[seriesIndex] = newDataMin;
}
}
// 如果新添加的数据Y值范围覆盖到原来的范围，则新的数据的范围就是最终的Y轴范围
else if (newDataMax >= _maxYValues[seriesIndex] && newDataMin <= _minYValues[seriesIndex])
{
_maxYValues[seriesIndex] = newDataMax;
_minYValues[seriesIndex] = newDataMin;
}
else
{
double max, min;
ParallelHandler.GetMaxAndMin(datas, out max, out min);
_maxYValues[seriesIndex] = max;
_minYValues[seriesIndex] = min;
}
}
protected bool IsRemovedDataInsideRange <TDataType>(OverLapWrapBuffer <TDataType> data, int samplesToAdd, int seriesIndex)
{
double lastMax = _maxYValues[seriesIndex];
double lastMin = _minYValues[seriesIndex];
int samplesToRemove = SamplesInChart + samplesToAdd - DataInfo.Capacity;
if (samplesToRemove <= 0)
{
return(true);
}
IList <TDataType> removedDatas = data.GetRange(0, samplesToRemove);
double dataMax, dataMin;
ParallelHandler.GetMaxAndMin(removedDatas, out dataMax, out dataMin);
// 是否在区域内的判定规则：新的数值范围最大不能超过原来的范围MinDoubleValue
bool isDataInsideRange = dataMax - lastMax < Constants.MinDoubleValue &&
lastMin - dataMin < Constants.MinDoubleValue;
// 是否在区域内的判定规则：新的范围的极值极性必须和原来的极值极性相同
bool isBoundSamePolarity = !(lastMax <= 0 ^ dataMax <= 0) && !(lastMin >= 0 ^ dataMin >= 0);
return(isDataInsideRange && isBoundSamePolarity);
}
public ReadOnlyBuf(OverLapWrapBuffer <TDataType> parentBuf, int start, int count)
{
this._parentBuf = parentBuf;
this._start = start;
this._count = count;
}