Help coding Average Candle Indicator

I have this average candle indicator that I really like but is doesn't plot historical data in the window. The average just changes after X amount of candles based on X time frame. I don't have the source file for the indicator but I've included the compiled version and a pic to help out in understanding what I want. Its pretty simple actually, but I will be around to answer any questions. I hope someone can help me out with this.

Yes,
I am actually looking for the mq4 file for that indi.

Really appreciate if someone can share me the code.

Thanks in advance.