I'm just curious that can a chart give interpretation such as for decision making. For doing charts itself i think there shouldn't be big prob but then in terms of interpretation part, do i have to have specific algorithm for AI elements or it is only a basic 'if-then-else' structure? need help here~

What do you mean "intepretation" as in give some sort of "forecasting" based on the charts?
If so... Should be rather easy, data from charts have to come from somewhere. Just obtain that data, apply some formula/algorithm which you will use to "intepret" the data.