Candle pivots with trendlines for Amibroker (AFL)

/////// advance trenlines with candle pivots /////////////////// 
SetChartOptions(0, chartShowArrows | chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} ,{{VALUES}}", O, H, L, C, SelectedValue(ROC(C, 1))));
Plot(C, "", IIf(O >= C, colorOrange, colorGreen), styleCandle);
SetChartBkGradientFill(ParamColor("Inner panel upper", colorBlack), ParamColor("Inner panel lower", colorBlack));
_N(Title = EncodeColor(colorWhite) + StrFormat(" {{NAME}} - {{INTERVAL}} {{DATE}} Open:%g,high:%g,low:%g, Close:%g ,{{VALUES}}", O, H, L, C));
/////////////////////////////////////////////////////////////////////////////////////////////
farback = Param("How Far back to go", 100, 50, 5000, 10);
nBars = Param("Number of bars", 12, 5, 40);
aHPivs = H - H;
aLPivs = L - L;
aHPivHighs = H - H;
aLPivLows = L - L;
aHPivIdxs = H - H;
aLPivIdxs = L - L;
nHPivs = 0;
nLPivs = 0;
lastHPIdx = 0;
lastLPIdx = 0;
lastHPH = 0;
lastLPL = 0;
curPivBarIdx = 0;
aHHVBars = HHVBars(H, nBars);
aLLVBars = LLVBars(L, nBars);
aHHV = HHV(H, nBars);
aLLV = LLV(L, nBars);
aVisBars = Status("barvisible");
nLastVisBar = LastValue(Highest(IIf(aVisBars, BarIndex(), 0)));
_TRACE("Last visible bar: " + nLastVisBar);
curBar = (BarCount - 1);
curTrend = "";
if (aLLVBars[curBar] < aHHVBars[curBar])
{
    curTrend = "D";
}

else
{
    curTrend = "U";
}

for (i = 0; i < farback; i++)
{
    curBar = (BarCount - 1) - i;
    if (aLLVBars[curBar] < aHHVBars[curBar])
    {
        if (curTrend == "U")
        {
            curTrend = "D";
            curPivBarIdx = curBar - aLLVBars[curBar];
            aLPivs[curPivBarIdx] = 1;
            aLPivLows[nLPivs] = L[curPivBarIdx];
            aLPivIdxs[nLPivs] = curPivBarIdx;
            nLPivs++;
        }
    }
    else
    {
        if (curTrend == "D")
        {
            curTrend = "U";
            curPivBarIdx = curBar - aHHVBars[curBar];
            aHPivs[curPivBarIdx] = 1;
            aHPivHighs[nHPivs] = H[curPivBarIdx];
            aHPivIdxs[nHPivs] = curPivBarIdx;
            nHPivs++;
        }
    }
}

curBar = (BarCount - 1);
candIdx = 0;
candPrc = 0;
lastLPIdx = aLPivIdxs[0];
lastLPL = aLPivLows[0];
lastHPIdx = aHPivIdxs[0];
lastHPH = aHPivHighs[0];
if (lastLPIdx > lastHPIdx)
{
    candIdx = curBar - aHHVBars[curBar];
    candPrc = aHHV[curBar];
    if (lastHPH < candPrc AND candIdx > lastLPIdx AND candIdx < curBar)
    {
        aHPivs[candIdx] = 1;
        for (j = 0; j < nHPivs; j++)
        {
            aHPivHighs[nHPivs - j] = aHPivHighs[nHPivs - (j + 1)];
            aHPivIdxs[nHPivs - j] = aHPivIdxs[nHPivs - (j + 1)];
        }
        aHPivHighs[0] = candPrc;
        aHPivIdxs[0] = candIdx;
        nHPivs++;
    }
}

else
{
    candIdx = curBar - aLLVBars[curBar];
    candPrc = aLLV[curBar];
    if (lastLPL > candPrc AND candIdx > lastHPIdx AND candIdx < curBar)
    {
        aLPivs[candIdx] = 1;
        for (j = 0; j < nLPivs; j++)
        {
            aLPivLows[nLPivs - j] = aLPivLows[nLPivs - (j + 1)];
            aLPivIdxs[nLPivs - j] = aLPivIdxs[nLPivs - (j + 1)];
        }
        aLPivLows[0] = candPrc;
        aLPivIdxs[0] = candIdx;
        nLPivs++;
    }
}

for (k = 0; k < nHPivs; k++)
{
    _TRACE("High pivot no. " + k + " at barindex: " + aHPivIdxs[k] + ", " + WriteVal(ValueWhen(BarIndex() == aHPivIdxs[k], DateTime(), 1), formatDateTime) + ", " + aHPivHighs[k]);
}

a1 = ahpivs == 1;
a2 = alpivs == 1;
PlotShapes(a1 *shapeSmallCircle, colorRed, 0, H, Offset = 5);
PlotShapes(a2 *shapeSmallCircle, colorGreen, 0, L, Offset = -5);
//////////////////////////////////////////////////////

Para = ParamToggle("Plot Parallel Lines","Off,On");
ColorS= ParamColor("Support",colorLime);
ColorR= ParamColor("Resistance",colorRed);
x = Cum(1);
s1 = L;
s11 = H;
pS = a2 == 1;



endt = LastValue(ValueWhen(ps,x,1));
startt = LastValue(ValueWhen(ps,x,2));
ends = LastValue(ValueWhen(ps,S1,1));
starts = LastValue(ValueWhen(ps,S1,2));
dtS = endt - startt;
aS = (endS - startS) / dtS;
bS = endS;
trendlineS = aS *(x - endt) + bS;
g3 = IIf(x > startt - 10, trendlineS,  Null);
Plot(g3, "", colors, styleThick);
pR = a1 == 1;
endt1 = LastValue(ValueWhen(pr,x,1));
startt1 = LastValue(ValueWhen(pr,x,2));
endr = LastValue(ValueWhen(pr,S11,1));
startr = LastValue(ValueWhen(pr,S11,2));
dtR = endt1 - startt1;
aR = (endR - startR) / dtR;
bR = endR;
trendlineR = aR *(x - endt1) + bR;
g4 = IIf(x > startT1 - 10, trendlineR,  Null);
Plot(g4, "", colorr, styleThick);

acd = log(endr/startr)/(endt1-startt1);
res1 = exp((x-endt1)*acd)*endr;
RRL = ROC(res1,1);
bcd = log(ends/starts)/(endt-startt);
sup1= exp((x-endt)*bcd)*ends;
RSL = ROC(sup1,1);

Low_Value = LastValue(Ref(LLV(L,endt1-startt1),-(x-endt1)));
x2 = LastValue(ValueWhen(L==Low_Value & x>startt1 & x<endt1,x));
PLL = IIf(LastValue(x)-x2>5,exp((x-x2)*acd)*Low_Value,Null);
Hi_Value = LastValue(Ref(HHV(H,endt-startt),-(x-endt)));
x3 = LastValue(ValueWhen(H==Hi_Value & x>startt & x<endt,x));
PHL = IIf(LastValue(x)-x3>5,exp((x-x3)*bcd)*Hi_Value,Null);
SLabs = sup1-Ref(sup1,-1); RLabs = res1-Ref(res1,-1);
ROC2SL = (SLabs/C)*100; ROC2RL = (RLabs/C)*100;
PLLd = abs((LastValue(C)/LastValue(PLL))-1)<0.01*100;
PHLd = abs((LastValue(C)/LastValue(PHL))-1)<0.01*100;
barvisible = Status("barvisible");
firstvisiblebar = barvisible & NOT
Ref(barvisible,-1);
HHvisible = LastValue(HighestSince(firstvisiblebar,High));
LLvisible = LastValue(LowestSince(firstvisiblebar,Low));
RaH = HHvisible *1.05; RaL = LLVisible *0.95; 
AnZ= starts==0 OR ends==0 OR startr==0 OR endr==0;
PLplot = IIf(x-x2>=0 & abs(LastValue(L/PLL)-1) <abs(LastValue((100/1000)*ATR(14))) & PLL>RaL & PLL<RaH & NOT AnZ,PLL,IIf(x-x2>=0 & RaL==0 & PLLd & abs(LastValue(L/PLL)-1) <abs(LastValue((100/1000)*ATR(14)))& NOT AnZ,PLL,Null));
PHplot = IIf(x-x3>=0 & abs(LastValue(H/PHL)-1) <abs(LastValue((100/1000)*ATR(14))) & PHL>RaL & PHL<RaH & NOT AnZ,PHL,IIf(x-x3>=0 & RaL==0 & PHLd & abs(LastValue(H/PHL)-1) <abs(LastValue((100/1000)*ATR(14)))& NOT AnZ,PHL,Null));
Plot(IIf(Para,PLplot,Null)," ",colorr,styleDashed,maskDefault+styleNoRescale);
Plot(IIf(Para,PHplot,Null)," ",colors,styleDashed,maskDefault+styleNoRescale);