/// <summary>
/// Creates the graph associated to this expression, when the given parameter ranges over the X axis
/// </summary>
/// <param name="context">The interpretation context</param>
/// <param name="parameter">The parameters of *the enclosing function* for which the graph should be created</param>
/// <param name="explain"></param>
/// <returns></returns>
public override Graph CreateGraph(InterpretationContext context, Parameter parameter, ExplanationPart explain)
{
Graph retVal = base.CreateGraph(context, parameter, explain);
Graph graph = InitialValue.CreateGraph(context, parameter, explain);
if (graph != null)
{
ListValue value = ListExpression.GetValue(context, explain) as ListValue;
if (value != null)
{
int token = PrepareIteration(context);
AccumulatorVariable.Value = graph.Function;
foreach (IValue v in value.Val)
{
if (v != EfsSystem.Instance.EmptyValue)
{
// All elements should always be != from EmptyValue
ElementFound = true;
IteratorVariable.Value = v;
if (ConditionSatisfied(context, explain))
{
MatchingElementFound = true;
AccumulatorVariable.Value = IteratorExpression.GetValue(context, explain);
}
}
NextIteration();
}
Function function = AccumulatorVariable.Value as Function;
if (function != null)
{
retVal = function.Graph;
}
else
{
retVal = Function.CreateGraphForValue(AccumulatorVariable.Value);
}
EndIteration(context, explain, token);
}
}
else
{
throw new Exception("Cannot create graph for initial value " + InitialValue);
}
return(retVal);
}