Pine script small indicator to MQL4

i need to convert a TradingView (PineScript) indicator to MQL4 

name of the indicator is "Donchian Trend Ribbon"

the source code will be below. 

visuals are important. so make sure the developed indicator will have the visuals 

all ordinal input should be represented. 

General conditions

write clear and well commented code. 

delivery should be within 2 days.

deliveries are the indicator ex4 and the developed source code mq4. 

the pine source code:

//@version=4

study("Donchian Trend Ribbon", precision = 0)

dlen = input(defval = 20, title = "Donchian Channel Period", minval = 10)

dchannel(len)=>

    float hh = highest(len)

    float ll = lowest(len)

    

    int trend = 0

    trend := close > hh[1] ? 1 : close < ll[1] ? -1 : nz(trend[1])

    

dchannelalt(len, maintrend)=>

    float hh = highest(len)

    float ll = lowest(len)

    

    int trend = 0

    trend := close > hh[1] ? 1 : close < ll[1] ? -1 : nz(trend[1])

    maintrend == 1  ? trend == 1  ? #00FF00ff :  #00FF009f :

     maintrend == -1 ? trend == -1 ? #FF0000ff :  #FF00009f :

     na

maintrend = dchannel(dlen)

plot( 5, color = dchannelalt(dlen - 0, maintrend), style = plot.style_columns, histbase= 0)

plot(10, color = dchannelalt(dlen - 1, maintrend), style = plot.style_columns, histbase= 5)

plot(15, color = dchannelalt(dlen - 2, maintrend), style = plot.style_columns, histbase=10)

plot(20, color = dchannelalt(dlen - 3, maintrend), style = plot.style_columns, histbase=15)

plot(25, color = dchannelalt(dlen - 4, maintrend), style = plot.style_columns, histbase=20)

plot(30, color = dchannelalt(dlen - 5, maintrend), style = plot.style_columns, histbase=25)

plot(35, color = dchannelalt(dlen - 6, maintrend), style = plot.style_columns, histbase=30)

plot(40, color = dchannelalt(dlen - 7, maintrend), style = plot.style_columns, histbase=35)

plot(45, color = dchannelalt(dlen - 8, maintrend), style = plot.style_columns, histbase=40)

plot(50, color = dchannelalt(dlen - 9, maintrend), style = plot.style_columns, histbase=45)

//end