Check EMA function that returns Angle of EMA

I am looking for a way to avoid trading small pullbacks in a strong trend, using the EMA.

What I need is someone to program a Function CheckEMA:

before opening a trade, we check the EMA.

The EMA has to be pointed in the direction of the current Trend: Up in a Long Trade, down in a Short trend.

And it has to be steeper than a certain Angle.

The function that I wish to be coded returns the angle of the EMA in an integer value: Positive for Up, negative for down. 

All this in a Heikin Ashi Chart.