PRC Q trend

You can, what are the conditions for that system?

Do you need an indicator or a strategy?

Here you have an exemple.
However, as the symbols are drawn in the past, there is a time lag between the signal and the backtest position (position taken 2 candlesticks after the one on which the signal is drawn).

//PRC_Q-Trend | indicator
//17.07.23
//Nicolas @ www.prorealcode.com
//Sharing ProRealTime knowledge

// ---settings
p = 200 //Trend period
atrp = 14 //ATR Period
mult = 1.0 //ATR Multiplier
mode = 1 //Signal mode options = [1="Type A", 2="Type B"]
useemasmoother = 0 //Smooth source with EMA? 0=false ; 1=true
srcemaperiod = 3 //EMA Smoother period
colorbars = 0 //Color bars? 0=false ; 1=true
signalsview = 0 //0 = trend inversion ; 1 = strong buy / strong sell only
// --- end of settings

source = customclose

// Calculations
if useemasmoother then
src = average[srcemaperiod,1](source)
else
src=source
endif

hh = highest[p](src) // Highest of src p-bars back;
ll = lowest[p](src) // Lowest of src p-bars back.
d = hh - ll

if barindex>p then
once m = (hh + ll) / 2 // Initial trend line;
atr = AverageTrueRange[atrp][1] // ATR;
epsilon = mult * atr // Epsilon is a mathematical variable used in many different theorems in order to simplify work with mathematical object. Here it used as sensitivity measure.

if mode=2 then  //type B
changeup = src crosses over m+epsilon or src crosses under m+epsilon
changedown = src crosses over m-epsilon or src crosses under m-epsilon
else
changeup = src crosses over m+epsilon or src > m+epsilon
changedown = src crosses under m-epsilon or src < m-epsilon
endif

sb = open < ll + d / 8 and open >= ll
ss = open > hh - d / 8 and open <= hh
strongbuy = sb or sb[1] or sb[2] or sb[3] or sb[4]
strongsell = ss or ss[1] or ss[2] or ss[3] or ss[4]

if (changeup or changedown) then
if changeup then
m=m + epsilon
elsif changedown then
m=m - epsilon
endif
else
m=m[1]
endif

if changeup then
r=0
g=255
elsif changedown then
r=255
g=0
endif

if signalsview=1 then
if strongbuy and ls<>1 then
buy 1 share at market
ls=1
endif
if strongsell and ls<>-1 then
sellshort 1 share at market
ls=-1
endif
else
if r<>r[1]and r>0 then
sellshort 1 share at market
endif
if r<>r[1]and r=0 then
buy 1 share at market
endif
endif
endif
set stop ploss 5
set target pprofit 3