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Stratégie combinée de ligne de réponse à impulsion à moyenne mobile et à impulsion infinie

Auteur:ChaoZhang est là., Date: 23 janvier 2024
Les étiquettes:

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Résumé

Il s'agit d'une stratégie quantitative qui combine l'utilisation de moyennes mobiles, de lignes de réponse d'impulsion infinie (IIR) et de moyennes mobiles linéaires adaptatives (ALMA).

Principe de stratégie

Les principales composantes de la stratégie sont les suivantes:

  1. Utiliser une combinaison de moyennes mobiles simples (SMA), d'ALMA et d'IIR pour détecter les signaux croisés entre eux en tant que calendrier d'entrée en bourse.

  2. Utilisez 3 RII avec des périodes différentes et calculez la distance entre eux pour déterminer si le prix est dans un état de contraction.

  3. À en juger par la pente de l'IIR, quand la pente monte, elle est verte, et quand elle tombe, elle est bleue.

  4. Calculez si la distance entre les SMA s'élargit, si c'est le cas, faites une marque spéciale, représentant l'expansion fan, ce qui signifie généralement que le prix entre dans un état de tendance.

  5. Combinez les signaux de surachat et de survente de l'indice de force relative (RSI) pour compléter les signaux de négociation.

En combinant l'utilisation des sections ci-dessus, la stratégie peut fournir des signaux d'entrée, de jugement et de sortie relativement complets et riches.

Analyse des avantages

L'avantage majeur de cette stratégie est que la combinaison d'indicateurs est complète et riche, en tenant compte à la fois des jugements de tendance et des ratios de volatilité et des états de surachat/survente, fournissant des références multidimensionnelles pour les décisions de négociation.

Un autre avantage est que les paramètres et les indicateurs sont faciles à régler et à optimiser afin que les utilisateurs puissent activer les indicateurs et les paramètres pertinents en fonction de leurs besoins.

Du point de vue de la gestion des risques, cette stratégie accorde une attention à la fois aux moyennes mobiles rapides et lentes, ce qui réduit la probabilité de signaux incorrects causés par les fluctuations des prix.

Analyse des risques

Les principaux risques de cette stratégie sont les suivants:

  1. Les paramètres trop complexes pour provoquer facilement des conflits entre les indicateurs et les combinaisons inappropriées de paramètres peuvent entraîner un surajustement.

  2. L'adoption de systèmes multiples de moyennes mobiles entraîne encore des pertes importantes en cas de graves troubles du marché (tels que des événements économiques majeurs).

  3. Un backtesting insuffisamment approfondi peut présenter un certain risque de biais de survie dans le commerce réel.

Dans la pratique, nous devons prêter attention à la gestion des risques et ajuster de manière appropriée la taille de la position.

Optimisation de la stratégie

Compte tenu de la combinaison complexe d'indicateurs et du grand nombre de paramètres de cette stratégie, des optimisations futures peuvent être apportées dans les aspects suivants:

  1. Simplifier la sélection des indicateurs, supprimer les indicateurs présentant de faibles corrélations ou des conflits.

  2. Optimiser la sélection des moyennes mobiles des RII afin de mieux correspondre aux caractéristiques du marché.

  3. Optimiser les combinaisons de moyennes mobiles rapides et lentes pour augmenter la stabilité des signaux croisés.

  4. Améliorer les modèles d'apprentissage automatique pour faciliter les jugements et améliorer l'adaptabilité des stratégies.

  5. Optimiser la corrélation avec les indices mondiaux pour améliorer le taux de réussite des jugements de tendance.

Conclusion

Grâce à des combinaisons flexibles et des optimisations d'indicateurs, cette stratégie peut refléter l'état du marché de manière relativement complète et fournir un soutien multidimensionnel pour les décisions de négociation.


/*backtest
start: 2023-12-23 00:00:00
end: 2024-01-10 00:00:00
period: 1m
basePeriod: 1m
exchanges: [{"eid":"Futures_Binance","currency":"BTC_USDT"}]
*/

//The plotchar UP/DOWN Arrows  is the crossover of the fastest MA and fastest IIR MAs
//
//The dots at the bottom are the two simple averages crossing over
//
//The count over/under the candles is the count of bars that the SMAs on their
//respective resolution are fanning out.
//
//The colored background indicates a squeeze, lime=kinda tight : green=very tight squeeze.  based on the 3 IIRs
//
//To answer my own question in a forum, looking at the code, i couldn't figure out how to get it from another timeframe
//and run the same calculations with the same results.  My answer in the end was to scale the chosen MA length
//in the corresponding CurrentPeriod/ChosenMAPeriod proportion.  This results in the same line in the same place when browsing through the
//different time resolutions.  Somebody might find this invaluable
//
//The counts are for MA's fanning out, or going parabolic.  Theres IIRs, Almas, one done of the other.  A lot.  
//The arrows above and below bars are from standard RSI numbers for OB/OS
//
//The IIRs changes color depending on their slope, which can be referenced easily with a variable.
//
//The backgrond on a bar-by-bar basis is colored when 2 sets of moving averages are in a squeeze, aka
//when price is consolidating.  
//
//This aims to help the trader combine conditions and entry criteria of the trade and explore these options visually.  
//They detail things from all time-frames on the current one.  I prefer it because of the fractal nature of price-action, both large and small,
//either yesterday or last year.  For best results, go long in short-term trades when the long-term trend is also up.
//and other profitable insights.  This is also a great example of an automation algorith.  
//
//The pretty ribbon is my script called 'Trading With Colors'. Use them together for fanciest results.  55/233 is my Fib Cross (golden/death)  Compare it to the classic 50/200 if
//you get bored.  I believe it simply works better, at least for Crypto.
//
//Evidently, I am a day-trader.  But this yields higher profits on larger time-frames anyways, so do play around with it. Find what works for you.

//Thanks and credit for code snippets goes to:
//matryskowal
//ChrisMoody, probably twice
//Alex Orekhov (everget)
//author=LucF and midtownsk8rguy, for PineCoders
//If you use code from this, real quick search for perhaps the original and give them a shoutout too.  I may have missed something

//Author: Sean Duffy
//@version=4
strategy(title = "Combination Parabolic MA/IIR/ALMA Strategy",
         shorttitle = "MA-QuickE", 
         overlay = true )
        //  calc_on_order_fills = true,
        //  calc_on_every_tick = true,
// Input Variables
showFIBMAs = input(false, type=input.bool, title="═══════════════ Show Fibby MAs ═══════════════")
maRes = input(960, type=input.integer, title="MA-Cross Resolution")
mal1 = input(8, type=input.integer, title="MA#1 Length")
mal2 = input(13, type=input.integer, title="MA#2 Length")
mal3 = input(34, type=input.integer, title="MA#3 Length")
loosePercentClose = input(1.1, type=input.float, title="SMA LooseSqueeze Percent")
showIIRs = input(false, type=input.bool, title="═══════════════════ Show IIRs ═══════════════════")
iirRes = input(60, type=input.integer, title="IIR Resolution")
percentClose = input(title="IIR Squeeze PercentClose", type=input.float, defval=.8)
iirlength1 = input(title="IIR Length 1", type=input.integer, defval=34)
iirlength2 = input(title="IIR Length 2", type=input.integer, defval=144)//input(title="ATR Period", type=input.integer, defval=1)
iirlength3 = input(title="IIR Length 3", type=input.integer, defval=720)//input(title="ATR Period", type=input.integer, defval=1)
showIIR1 = input(true, type=input.bool, title="Show IIR1")
showIIR2 = input(true, type=input.bool, title="Show IIR2")
showIIR3 = input(true, type=input.bool, title="Show IIR3")
showCounts = input(true, type=input.bool, title="═════════════ Show Parabolic MA Counts ════════════")
showSignals = input(true, type=input.bool, title="══════════════ Show Buy/Sell Signals ══════════════")
showBackground = input(true, type=input.bool, title="══════════════ Show Background Colors ══════════════")
//runStrategy = input(true, type=input.bool, title="══════════════ Run Strategy  ══════════════")
debug = input(false, type=input.bool, title="══════════════ Show Debug ══════════════")

barLookbackPeriod = input(title="══ Bar Lookback Period ══", type=input.integer, defval=5)
percentageLookbackPeriod = input(title="══ Percentage Lookback Period ══", type=input.integer, defval=1)

bullcolor = color.green
bearcolor = color.red
color bgcolor = na

var bool slope1Green = na
var bool slope2Green = na
var bool slope3Green = na

var bool buySignal = na
var bool sellSignal = na
var bool bigbuySignal = na
var bool bigsellSignal = na
bool smbuySignal = false
bool smsellSignal = false
var bool insqueeze = na
var bool intightsqueeze = na
var bool infastsqueeze = na
var bool awaitingEntryIn = false

// My counting variables
var int count1 = 0
var float madist1 = 0
var int count2 = 0
var float madist2 = 0
var int sinceSmSignal = 0

var entryPrice = 0.0
var entryBarIndex = 0
var stopLossPrice = 0.0
// var updatedEntryPrice = 0.0
// var alertOpenPosition = false
// var alertClosePosition = false
// var label stopLossPriceLabel = na
// var line stopLossPriceLine = na
positionType = "LONG" // Strategy type, and the only current option

hasOpenPosition = strategy.opentrades != 0
hasNoOpenPosition = strategy.opentrades == 0

strategyClose() =>
    if (hasOpenPosition)
        if positionType == "LONG"
            strategy.close("LONG", when=true)
        else 
            strategy.close("SHORT", when=true)
strategyOpen() =>
    if (hasNoOpenPosition)
        if positionType == "LONG"
            strategy.entry("LONG", strategy.long, when=true)
        else 
            strategy.entry("SHORT", strategy.short, when=true)
checkEntry() =>
    buysignal = false
    if (hasNoOpenPosition)
        strategyOpen()
        buysignal := true
    // if (slope1Green and (trend1Green or trend2Green) and awaitingEntryIn and hasNoOpenPosition)
    //     strategyOpen()
    //     buysignal := true
    buysignal
checkExit() =>
    sellsignal = false
    // if (trend1Green == false and trend2Green == false) // to later have quicker exit strategy
    //     sellsignal := true
    //     strategyClose()
    if (hasOpenPosition)
        sellsignal := true
        strategyClose()
    sellsignal

multiplier(_adjRes, _adjLength) => // returns adjusted length
    multiplier = _adjRes/timeframe.multiplier
    round(_adjLength*multiplier)
    
    
//reset the var variables before new calculations
buySignal := false
sellSignal := false
smbuySignal := false
smsellSignal := false
bigbuySignal := false
bigsellSignal := false

ma1 = sma(close, multiplier(maRes, mal1))
ma2 = sma(close, multiplier(maRes, mal2))
ma3 = sma(close, multiplier(maRes, mal3))


madist1 := abs(ma1 - ma2)
madist2 := abs(ma1 - ma3) // check if MA's are fanning/going parabolic
if (ma1 >= ma2 and ma2 >= ma3 and madist1[0] > madist1[1]) //and abs(dataB - dataC >= madist2)  // dataA must be higher than b, and distance between gaining, same with C
    count1 := count1 + 1
else 
    count1 := 0
if (ma1 <= ma2 and ma2 <= ma3 and madist1[0] > madist1[1])  //<= madist2 and dataB <= dataC) //and abs(dataB - dataC >= madist2)  // dataA must be higher than b, and distance between gaining, same with C
    count2 := count2 + 1
else 
    count2 := 0


crossoverAB = crossover(ma1, ma2) 
crossunderAB = crossunder(ma1, ma2)

plot(showFIBMAs ? ma1 : na, linewidth=3)
plot(showFIBMAs ? ma2 : na)
plot(showFIBMAs ? ma3 : na)


// Fast Squeese Check WORK IN PROGRESS
// 
float singlePercent = close / 100 
if max(madist1, madist2) <= singlePercent*loosePercentClose
    bgcolor := color.yellow
    infastsqueeze := true
else
    infastsqueeze := false



// IIR MOVING AVERAGE
f(a) => a[0] // fixes mutable error
iirma(iirlength, iirsrc) =>
    cf = 2*tan(2*3.14159*(1/iirlength)/2)
    a0 = 8 + 8*cf + 4*pow(cf,2) + pow(cf,3)
    a1 = -24 - 8*cf + 4*pow(cf,2) + 3*pow(cf,3)
    a2 = 24 - 8*cf - 4*pow(cf,2) + 3*pow(cf,3)
    a3 = -8 + 8*cf - 4*pow(cf,2) + pow(cf,3)
    //----
    c = pow(cf,3)/a0
    d0 = -a1/a0
    d1 = -a2/a0
    d2 = -a3/a0
    //----
    out = 0.
    out := nz(c*(iirsrc + iirsrc[3]) + 3*c*(iirsrc[1] + iirsrc[2]) + d0*out[1] + d1*out[2] + d2*out[3],iirsrc)
    f(out)


iirma1 = iirma(multiplier(iirRes, iirlength1), close)
iirma2 = iirma(multiplier(iirRes, iirlength2), close)
iirma3 = iirma(multiplier(iirRes, iirlength3), close)

// adjusts length for current resolution now, length is lengthened/shortened accordingly, upholding exact placement of lines
// iirmaD1 = security(syminfo.tickerid, tostring(iirRes), iirma1, barmerge.gaps_on, barmerge.lookahead_on)
// iirmaD2 = security(syminfo.tickerid, tostring(iirRes), iirma2, barmerge.gaps_on, barmerge.lookahead_on)
// iirmaD3 = security(syminfo.tickerid, tostring(iirRes), iirma3, barmerge.gaps_on, barmerge.lookahead_on)

slope1color = slope1Green ? color.lime : color.blue
slope2color = slope2Green ? color.lime : color.blue
slope3color = slope3Green ? color.lime : color.blue

plot(showIIR1 and showIIRs ? iirma1 : na, title="IIR1", color=slope1color, linewidth=2, transp=30)
plot(showIIR2 and showIIRs ? iirma2 : na, title="IIR2", color=slope2color, linewidth=3, transp=30)
plot(showIIR3 and showIIRs ? iirma3 : na, title="IIR3", color=slope3color, linewidth=4, transp=30)

// checks slope of IIRs to create a boolean variable and and color it differently
if (iirma1[0] >= iirma1[1])
    slope1Green := true
else
    slope1Green := false
if (iirma2[0] >= iirma2[1])
    slope2Green := true
else
    slope2Green := false
if (iirma3[0] >= iirma3[1])
    slope3Green := true
else
    slope3Green := false

// calculate space between IIRs and then if the price jumps above both
//float singlePercent = close / 100  // = a single percent
var float distIIR1 = na
var float distIIR2 = na
distIIR1 := abs(iirma1 - iirma2)
distIIR2 := abs(iirma1 - iirma3)

if (distIIR1[0] < percentClose*singlePercent and close[0] >= iirma1[0])
    if close[0] >= iirma2[0] and close[0] >= iirma3[0]
        bgcolor := color.green
        insqueeze := true
        intightsqueeze := true
    else
        bgcolor := color.lime
        insqueeze := true
        intightsqueeze := false
else
    insqueeze := false
    intightsqueeze := false


// if (true)//sinceSmSignal > 0) //  cutting down on fastest MAs noise
//     sinceSmSignal := sinceSmSignal + 1
//     if (crossoverAB)
//         //checkEntry()
//         //smbuySignal := true
//         sinceSmSignal := 0
//     if (crossunderAB) // and all NOT greennot (slope1Green and slope2Green and slope3Green)
//         //checkExit()
//         //smsellSignal := true
//         sinceSmSignal := 0
// else
//     sinceSmSignal := sinceSmSignal + 1


f_draw_infopanel(_x, _y, _line, _text, _color)=>
    _rep_text = ""
    for _l = 0 to _line
        _rep_text := _rep_text + "\n"
    _rep_text := _rep_text + _text
    var label _la = na
    label.delete(_la)
    _la := label.new(
         x=_x, y=_y, 
         text=_rep_text, xloc=xloc.bar_time, yloc=yloc.price, 
         color=color.black, style=label.style_labelup, textcolor=_color, size=size.normal)

posx = timenow + round(change(time)*60)
posy = highest(50)

// CONSTRUCTION ZONE
// TODO:  program way to eliminate noise and false signals
// MAYBEDO: program it to differentiate between a moving average bump and a cross
//          I think the best way would be to calculate the tangent line... OR
//          Take the slope of both going back a couple bars and if it's close enough, its a bounce off
//          and an excellent entry signal
// program in quickest exit, 2 bars next to eachother both closing under, as to avoid a single wick from
// prompting to close the trade
// Some other time, have it move SMA up or down depending on whether trending up or down.  Then use those MA crosses

//THIS CHECKS THE SLOPE FROM CURRENT PRICE TO BACK 10 BARS
checkSlope(_series) =>  (_series[0]/_series[10])*100 // it now returns it as a percentage

doNewX = input(true, type=input.bool, title="══════════ Show misc MA Cross Strategy ══════════")

iirX = input(555, title="IIRx Length: ", type=input.integer)
iirXperiod = input(30, title="IIRx Period/TF: ", type=input.integer)

iirX2 = input(13, title="IIRx2 Length: ", type=input.integer)
iirX2period = input(5, title="IIRx2 Period/TF: ", type=input.integer) //15

almaXperiod = input(defval=15, title="Alma of IIR1 Period: ", type=input.integer)
almaXalpha = input(title="Alma Alpha Value: ", defval=.7, maxval=.95, type=input.float) // dont forget to try .99
almaXsigma = input(title="Alma Sigma Value: ", defval=500, type=input.float)

iirmaOTF = iirma(multiplier(iirXperiod, iirX), close)
iirma2OTF = iirma(multiplier(iirX2period, iirX2), close)
smaOTF = alma(iirmaOTF, almaXperiod, almaXalpha, almaXsigma) // maybe dont touch, its precise  // I took the ALMA of the IIRMA, and i hope thats not cheating ;)

// I could have removed this.  the multiplier function adjusts the length to fit the current timeframe while displaying the same
// smaXOTF = security(syminfo.tickerid, smaXperiod, smaOTF, barmerge.gaps_on, barmerge.lookahead_on)
// iirmaXOTF = security(syminfo.tickerid, iirXperiod, iirmaOTF, barmerge.gaps_on, barmerge.lookahead_on)
// iirmaX2OTF = security(syminfo.tickerid, iirX2period, iirma2OTF, barmerge.gaps_on, barmerge.lookahead_on)
plot(doNewX ? smaOTF : na, title="FastMA X-Over :  ", color=color.blue, linewidth=1, transp=40)
plot(doNewX ? iirmaOTF : na, title="IIR MAx :  ", color=color.purple, linewidth=1, transp=30)
plot(doNewX ? iirma2OTF : na, title="IIR MAx :  ", color=color.purple, linewidth=2, transp=20)

iirma2Up = checkSlope(iirma2OTF) > 0 // just another slope up/down variable. 

//calculate spaces between averages
distiiralma = abs(iirmaOTF - smaOTF)

crossoverFast = crossover(iirmaOTF, smaOTF) // and (iirmaOTF[1] <= smaOTF[1])
crossunderFast = crossunder(iirmaOTF, smaOTF) // and (iirmaOTF[1] >= smaOTF[1])

if (crossoverFast and iirma2Up == true and infastsqueeze == false and intightsqueeze == false) // and (count1 != 0))// or close[0] < (lowest(barLookbackPeriod) + singlePercent*3))) // must be at most a few percent up from a recent low.  Avoid buying highs :P
    buySignal := true
    strategyOpen()
    // if (slope1Green and slope2Green and slope3Green and infastsqueeze == false)
    //     checkEntry()
if (crossunderFast)
    sellSignal := true
    checkExit()

// I feel like I didn't cite the OG author for this panel correctly. I hope I did, but there are extentions of his/her work in multiple places.
// I could have gotten it confused.
if (debug)
    f_draw_infopanel(posx, posy, 18, "distiiralma from IIR: " + tostring(distiiralma), color.lime)
    //f_draw_infopanel(posx, posy, 16, "distiirs: " + tostring(distiirX1), color.lime)
    f_draw_infopanel(posx, posy, 14, "Value of iirmaOTF: " + tostring(iirmaOTF), color.lime)
    f_draw_infopanel(posx, posy, 6, "slope X: " + tostring(abs(100 - checkSlope(iirmaOTF))), color.lime)
    f_draw_infopanel(posx, posy, 12, "value of smaOTF: " + tostring(smaOTF), color.lime)
    f_draw_infopanel(posx, posy, 6, "slopeAlma: " + tostring(abs(100 - checkSlope(smaOTF))), color.lime)
    f_draw_infopanel(posx, posy, 2, "slopeIIR2 " + tostring(abs(100 - checkSlope(iirma2OTF))), color.lime)
    f_draw_infopanel(posx, posy, 2, "slopeIIR2 " + tostring(abs(100 - checkSlope(iirma2OTF))), color.lime)


// I kept this separate because it discludes the calculations.  Its hard to hold a train of thought while fishing for the right section
bgcolor(showBackground ? bgcolor : na)
plotshape(showSignals ? buySignal : na, location=location.bottom, style=shape.circle, text="", size=size.tiny, color=color.blue, transp=60)
plotshape(showSignals ? sellSignal : na, location=location.bottom, style=shape.circle, text="", size=size.tiny, color=color.red, transp=60)
plotchar(showSignals and smbuySignal, title="smBuy", location=location.belowbar, char='↑', size=size.tiny, color=color.green, transp=0)
plotchar(showSignals and smsellSignal, title="smSell", location=location.abovebar, char='↓', size=size.tiny, color=color.orange, transp=0)

// can not display a variable. Can only match the count to a corresponding plotchar
// to display a non-constant variable, use the debug box, which was so kindly offered up by our community.
plotchar(showCounts and count1==1, title='', char='1', location=location.belowbar, color=#2c9e2c, transp=0)
plotchar(showCounts and count1==2, title='', char='2', location=location.belowbar, color=#2c9e2c, transp=0)
plotchar(showCounts and count1==3, title='', char='3', location=location.belowbar, color=#2c9e2c, transp=0)
plotchar(showCounts and count1==4, title='', char='4', location=location.belowbar, color=#2c9e2c, transp=0)
plotchar(showCounts and count1==5, title='', char='5', location=location.belowbar, color=#2c9e2c, transp=0)
plotchar(showCounts and count1==6, title='', char='6', location=location.belowbar, color=#2c9e2c, transp=0)
plotchar(showCounts and count1==7, title='', char='7', location=location.belowbar, color=#2c9e2c, transp=0)
plotchar(showCounts and count1==8, title='', char='8', location=location.belowbar, color=#2c9e2c, transp=0)
plotchar(showCounts and count1==9, title='', char='9', location=location.belowbar, color=#2c9e2c, transp=0)
plotchar(showCounts and count1>=10, title='', char='$', location=location.belowbar, color=#2c9e2c, transp=0)
    
plotchar(showCounts and count2==1, title='', char='1', location=location.abovebar, color=#e91e63, transp=0)
plotchar(showCounts and count2==2, title='', char='2', location=location.abovebar, color=#e91e63, transp=0)
plotchar(showCounts and count2==3, title='', char='3', location=location.abovebar, color=#e91e63, transp=0)
plotchar(showCounts and count2==4, title='', char='4', location=location.abovebar, color=#e91e63, transp=0)
plotchar(showCounts and count2==5, title='', char='5', location=location.abovebar, color=#e91e63, transp=0)
plotchar(showCounts and count2==6, title='', char='6', location=location.abovebar, color=#e91e63, transp=0)
plotchar(showCounts and count2==7, title='', char='7', location=location.abovebar, color=#e91e63, transp=0)
plotchar(showCounts and count2==8, title='', char='8', location=location.abovebar, color=#e91e63, transp=0)
plotchar(showCounts and count2==9, title='', char='9', location=location.abovebar, color=#e91e63, transp=0)
plotchar(showCounts and count2>=10, title='', char='$', location=location.abovebar, color=#e91e63, transp=0)

showRSIind = input(true, type=input.bool, title="═══════════════════ Show RSI Arrows ═══════════════════")
// Get user input
rsiSource = input(title="RSI Source", type=input.source, defval=close)
rsiLength = input(title="RSI Length", type=input.integer, defval=14)
rsiOverbought = input(title="RSI Overbought Level", type=input.integer, defval=80)
rsiOversold = input(title="RSI Oversold Level", type=input.integer, defval=20)
// Get RSI value
rsiValue = rsi(rsiSource, rsiLength)
isRsiOB = rsiValue >= rsiOverbought
isRsiOS = rsiValue <= rsiOversold
// Plot signals to chart
plotshape(isRsiOB, title="Overbought", location=location.abovebar, color=color.red, transp=0, style=shape.triangledown)
plotshape(isRsiOS, title="Oversold", location=location.belowbar, color=color.green, transp=0, style=shape.triangleup)

//reset the var variables before new calculations
buySignal := false
sellSignal := false
smbuySignal := false
smsellSignal := false
bigbuySignal := false
bigsellSignal := false


Plus de