Can anyone here pls convert the following ideas to afl's pls?

I want to buy a stock when its avg price is above short term (suppose 15 days) 
weekly price and then ema cross over-


cond1= When c>weekly ema of close of 15 days
ma1= ema ( c,10);
Buy=cross ( C,ma1);


Is there any way or code to plot a volume graph that is net addition of volume? 
 Net addition volumeline?

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