/// <summary>
/// Compile a function string ("sin(t, C)") into a Func<double, double>, connect it with the sample and store it.
/// </summary>
/// <param name="text">A string that represents a function that can be used to generate a waveform.</param>
private void CompileFunction(string text)
{
IExpressionEvaluator eval = new ExpressionEvaluator(ExpressionLanguage.CSharp);
var context = new EvalContext {
S = this
};
EvalExpression <double, EvalContext> expression = eval.GetDelegate <double, EvalContext>(text);
_compiledfunction = GetMethod(context, expression);
}
/// <summary>
/// Since an EvalExpression can't take any parameters but takes all its information from its evaluation context object
/// we'll need a wrapper to create a convenient Func<double, double> to use for the calculations.
/// </summary>
/// <param name="context"></param>
/// <param name="expr"></param>
/// <returns></returns>
private static Func <double, double> GetMethod(EvalContext context, EvalExpression <double, EvalContext> expr)
{
Func <double, double> ret = delegate(double t)
{
context.t = t;
return(expr(context));
};
return(ret);
}
