EA - Gradient of EMA in MQL4

I would like an EA that is able to calculate the gradient of an EMA line. Initially i would like this to be set up on the daily close of the EURUSD for a 14EMA, however in the future i would like to modify this so that i can look at other currencies (ie. EURGBP) and also change the chart to a 15minute and look at a 5EMA, such the EA can then calculate the gradient of this EMA dependant on a different time period close. Thus, this EA needs to be configurable and modifiable easily enough for a person with limited use and experience with EA's.