public static ExtendedObservableCollection <IndicatorValue> filterDiagramValues(IEnumerable <IndicatorValue> values)
{
var sortedValues = values.OrderBy(x => x.Timestamp);
ExtendedObservableCollection <IndicatorValue> resultList = new ExtendedObservableCollection <IndicatorValue>();
// add average values to the diagram list
int intervalToAverage = values.Count() / NUMBER_OF_VALUES_IN_DIAGRAM;
if (intervalToAverage > 1)
{
for (int i = 0; i < sortedValues.Count(); i += intervalToAverage)
{
if (sortedValues.Count() >= i + intervalToAverage)
{
try
{
double sum = 0;
for (int j = i; j < i + intervalToAverage; j++)
{
sum += Convert.ToInt32(sortedValues.ElementAt(j).Value);
}
IndicatorValue middleElement = sortedValues.ElementAt(i + intervalToAverage / 2);
resultList.Add(new IndicatorValue(Convert.ToInt32(sum / intervalToAverage), middleElement.DataType, middleElement.Timestamp, middleElement.MappingState));
}
catch (Exception e)
{
Console.WriteLine("DiagramHelper.filterDiagramValues: Problem filtering values for diagram. " + e.Message);
}
}
}
}
else
{
foreach (IndicatorValue v in sortedValues)
{
try{
resultList.Add(new IndicatorValue(Convert.ToInt32(v.Value), v.DataType, v.Timestamp, v.MappingState));
}catch (Exception) {}
}
}
// collect distances and define "normal" time distance between two values
// lets take the median
List <TimeSpan> distances = new List <TimeSpan>();
for (int i = 0; i < resultList.Count; i++)
{
if (i < resultList.Count - 1)
{
distances.Add((resultList.ElementAt(i + 1).Timestamp - resultList.ElementAt(i).Timestamp));
}
}
//sort and take middle as reference distance
distances.Sort();
double referenceDistanceInSeconds = 0;
if (distances.Count > 0)
{
referenceDistanceInSeconds = distances.ElementAt(distances.Count / 2).TotalSeconds;
}
List <IndicatorValue> valuesToAdd = new List <IndicatorValue>();
for (int i = 0; i < resultList.Count; i++)
{
if (i < resultList.Count - 1)
{
if ((resultList.ElementAt(i + 1).Timestamp - resultList.ElementAt(i).Timestamp).TotalSeconds > referenceDistanceInSeconds * 5)
{
// Add Dummy 0 Values, so the graph shows no ugly lines when system was off
valuesToAdd.Add(new IndicatorValue(0, resultList.ElementAt(i).DataType, resultList.ElementAt(i).Timestamp.AddMilliseconds(100), resultList.ElementAt(i).MappingState));
valuesToAdd.Add(new IndicatorValue(0, resultList.ElementAt(i + 1).DataType, resultList.ElementAt(i + 1).Timestamp.AddMilliseconds(-100), resultList.ElementAt(i + 1).MappingState));
}
}
}
foreach (IndicatorValue v in valuesToAdd)
{
resultList.Add(v);
}
return(resultList);
}
