// --> auxilliaries for above mentioned:
private double?CalculateSpanLengthFromPosition(UserSpan referenceSpan)
{
if (referenceSpan.IsLastSpan)
{
return(null);
}
else
{
double?towerAbscissa1 = referenceSpan.TowerAbscissa;
double?towerAbscissa2 = Spans[Spans.IndexOf(referenceSpan) + 1].TowerAbscissa;
double?spanLength;
if (towerAbscissa1.HasValue && towerAbscissa2.HasValue)
{
spanLength = towerAbscissa2 - towerAbscissa1;
if (spanLength <= 0)
{
return(null);
}
else
{
return(spanLength);
}
}
else
{
return(null);
}
}
}
public void RemoveSelectedSpan() // removes selected (doh) span
{
if (Spans.Count <= 2)
{
return;
}
int index = Spans.IndexOf(_selectedSpan);
_selectedSpan.PropertyChanged -= OnUserSpanPropertyChanged;
Spans.Remove(_selectedSpan);
OrderingSection();
if (index >= Spans.Count())
{
return; // last span was removed so nothing to do
}
else
{
OnTowerAbscissaPropertyChanged(Spans[index]); // altering span lengths as a consequence of the tower abscissas change (change of tower abscissa has higher priority than span length)
}
if (EvaluateNeedToPerformInternalIntegrityCheck())
{
CheckInternalIntegrity();
}
}
public void AddSpanAfterSelectedSpan()
{
int index = Spans.IndexOf(_selectedSpan);
UserSpan newSpan = new UserSpan();
newSpan.PropertyChanged += OnUserSpanPropertyChanged;
Spans.Insert(index + 1, newSpan);
OrderingSection();
SelectedUserSpan = Spans[index + 1];
}
private void OnSpanLengthPropertyChanged(object sender)
{
UserSpan actualSpan = sender as UserSpan;
int index = Spans.IndexOf(actualSpan);
double? value;
if (!actualSpan.TowerAbscissa.HasValue)
{
actualSpan.TowerAbscissa = 0;
}
for (int i = index; i < Spans.Count - 1; i++)
{
value = CalculatePositionFromSpanLength(Spans[i + 1]);
//if (!value.HasValue) break;
Spans[i + 1].TowerAbscissa = value;
}
}
// --> reaction on concrete property change
private void OnTowerAbscissaPropertyChanged(object sender)
{
UserSpan actualSpan = sender as UserSpan;
int index = Spans.IndexOf(actualSpan);
double?value;
for (int i = index - 1; i < Spans.Count - 1; i++)
{
if (i >= 0)
{
value = CalculateSpanLengthFromPosition(Spans[i]);
//if (!value.HasValue) break;
Spans[i].SpanLength = value;
}
}
}
private double?CalculatePositionFromSpanLength(UserSpan referenceSpan)
{
double?spanLength;
double?towerAbscissa0;
int indexOfActualSpan;
int indexOfPreviousSpan;
indexOfActualSpan = Spans.IndexOf(referenceSpan);
if (indexOfActualSpan == 0)
{
if (referenceSpan.TowerAbscissa.HasValue)
{
return(referenceSpan.TowerAbscissa);
}
else
{
return(0);
}
}
else
{
indexOfPreviousSpan = indexOfActualSpan - 1;
spanLength = Spans[indexOfPreviousSpan].SpanLength;
towerAbscissa0 = Spans[indexOfPreviousSpan].TowerAbscissa;
if (towerAbscissa0.HasValue && spanLength.HasValue)
{
return(towerAbscissa0 + spanLength);
}
else
{
return(null);
}
}
}
public void ClearSelectedSpan()
{
Spans[Spans.IndexOf(_selectedSpan)].Clear();
SelectedUserSpan.Clear();
}