Need help converting mq4 to afl

I found this indicator by mladen - TMA Bands + CD non repaint. I'd like to convert the mq4 to Amibroker afl but my coding is limited.


On the Amibroker forum there is some code for TMA bands but it repaints horribly - https://forum.amibroker.com/t/need-m...e-for-tma/1645

If anyone knows why it repaints so much, please correct the code.

_SECTION_BEGIN("TMA");
HalfLength = Param("HalfLength", 61, 1, 999);
ATRPeriod = Param("ATRPeriod", 110,1,1000);

ATRMultiplier9 = Param("ATR Multiplier 9", 5.0);

cMidB = ParamColor("Mid Band", colorGreen);
cUprB = ParamColor("Upper Band", colorRed);
cLwrB = ParamColor("Lower Band", ColorRGB(30,144,255));
HalfLength=Max(HalfLength,1);
midBand = Null;
p = Close;
sma = MA(P, 1);
iatr= ATR(ATRPeriod);
iLmt = BarCount-1 - (HalfLength);

for (i=0; i<BarCount; i++)
{

dSum = (HalfLength+1)* sma[i];
sumw = (HalfLength+1);

for(j=1, k=HalfLength; j<=HalfLength; j++, k--)
{
if(i+j>=BarCount) break;
dSum += k* sma[i+j];
sumw += k;
if (j<=i)
{
dSum += k*sma[i-j];
sumw += k;
}
}
MidBand[i] = dSum/sumw;

}
UprBand9 = MidBand+iATR*ATRMultiplier9;
LwrBand9 = MidBand-iATR*ATRMultiplier9;
Plot(MidBand, "MidBand", cMidB, styleNoLabel|styleNoTitle);

Plot(UprBand9, "UprBand9", cUprB, styleNoLabel|styleNoTitle|styleStaircase);
Plot(LwrBand9, "LwrBand9", cLwrB, styleNoLabel|styleNoTitle|styleStaircase);
_SECTION_END();

That specific indicator wasn't created my Mladen (he doesn't put his name in the tools that he creates) but you'll likely have more help on
https://forum.amibroker.com/c/afl/ since most coders on here either code in MQL or Pinescript.

The point is to convert the mq4 to afl.

The same question was asked on the Amibroker forum in 2017 and got no response. I'm hoping that the afl code I pasted is enough for an experienced coder to spot the error.