public void UpdateChart(bool rangeFixed)
{
if (updating)
{
return;
}
updating = true;
try
{
SeriesAmount.ItemsSource = null;
collection.Clear();
if (this.Selection == null)
{
return;
}
IEnumerable <HistoryDataValue> rows = this.Selection.Values;
if (rows == null || !this.IsVisible)
{
return;
}
HistoryRange range = HistoryRange.Year;
if (this.RangeCombo.SelectedItem != null)
{
string value = this.RangeCombo.SelectedItem.ToString();
Enum.TryParse <HistoryRange>(value, out range);
}
Brush brush = this.Selection.Brush;
if (brush == null)
{
brush = Brushes.DarkSlateBlue;
}
TimeSpan dateRange = ComputeChartParameters(rows);
if (!rangeFixed)
{
if (dateRange <= TimeSpan.FromDays(31))
{
range = HistoryRange.Day;
this.RangeCombo.SelectedItem = range;
}
else if (dateRange <= TimeSpan.FromDays(365))
{
range = HistoryRange.Month;
this.RangeCombo.SelectedItem = range;
}
else
{
range = HistoryRange.Year;
this.RangeCombo.SelectedItem = range;
}
}
DateTime startDate = DateTime.Now;
int maxColumns = 20;
if (range == HistoryRange.Month)
{
maxColumns = 24;
startDate = this.selection.EndDate.AddMonths(-maxColumns);
}
else if (range == HistoryRange.Day)
{
maxColumns = 31;
startDate = this.selection.EndDate.AddDays(-maxColumns);
}
else
{
maxColumns = 20;
startDate = this.selection.EndDate.AddYears(-maxColumns);
}
decimal total = 0;
DateTime start = DateTime.MinValue;
// the current column fills this bucket until the next column date boundary is reached
List <HistoryDataValue> bucket = new List <HistoryDataValue>();
foreach (HistoryDataValue t in rows)
{
decimal amount = t.Value;
if (invert)
{
amount = -amount;
}
DateTime td = t.Date;
while (start == DateTime.MinValue || start.Year < td.Year ||
(range == HistoryRange.Month && start.Month < td.Month) ||
(range == HistoryRange.Day && start.Day < td.Day))
{
if (start != DateTime.MinValue)
{
AddColumn(start, range, total, bucket, brush);
}
if (start == DateTime.MinValue)
{
start = new DateTime(td.Year, (range == HistoryRange.Month || range == HistoryRange.Day) ? td.Month : 1,
range == HistoryRange.Day ? td.Day : 1);
}
else
{
switch (range)
{
case HistoryRange.All:
case HistoryRange.Year:
start = start.AddYears(1);
break;
case HistoryRange.Month:
start = start.AddMonths(1);
break;
case HistoryRange.Day:
start = start.AddDays(1);
break;
}
}
total = 0;
bucket = new List <HistoryDataValue>();
}
if (t.Date < start)
{
continue;
}
total += amount;
bucket.Add(t);
}
if (total != 0)
{
AddColumn(start, range, total, bucket, brush);
}
while (collection.Count > maxColumns)
{
collection.RemoveAt(0);
}
ComputeLinearRegression();
ObservableCollection <HistoryChartColumn> copy = new ObservableCollection <HistoryChartColumn>(this.collection);
SeriesAmount.ItemsSource = copy;
AverageSeries.ItemsSource = copy;
BarChart.InvalidateArrange();
}
catch (Exception ex)
{
Trace.WriteLine(ex.ToString());
}
finally
{
updating = false;
}
}