예제 #1
0
        /// <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>
        /// <returns></returns>
        public override Functions.Graph createGraph(InterpretationContext context, Parameter parameter)
        {
            Functions.Graph retVal = base.createGraph(context, parameter);

            Functions.Graph graph = InitialValue.createGraph(context, parameter);
            if (graph != null)
            {
                Values.ListValue value = ListExpression.GetValue(context) as Values.ListValue;
                if (value != null)
                {
                    int token = PrepareIteration(context);
                    AccumulatorVariable.Value = graph.Function;

                    foreach (Values.IValue v in value.Val)
                    {
                        if (v != EFSSystem.EmptyValue)
                        {
                            IteratorVariable.Value = v;
                            if (conditionSatisfied(context))
                            {
                                AccumulatorVariable.Value = IteratorExpression.GetValue(context);
                            }
                        }
                        NextIteration();
                    }
                    Functions.Function function = AccumulatorVariable.Value as Functions.Function;
                    if (function != null)
                    {
                        retVal = function.Graph;
                    }
                    else
                    {
                        retVal = Functions.Function.createGraphForValue(AccumulatorVariable.Value);
                    }
                    EndIteration(context, token);
                }
            }
            else
            {
                throw new Exception("Cannot create graph for initial value " + InitialValue.ToString());
            }

            return(retVal);
        }