HalfTrend-1.02

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//| HalfTrend.mq4 |
//| Copyright 2014, FxProSystems.com |
//| http://fxprosystems.com/ |
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#property copyright “Copyright ?2015 FXProSystems.com”
#property link “http://fxprosystems.com/”
#property indicator_chart_window
#property indicator_buffers 6
#property indicator_color1 DodgerBlue // up[]
#property indicator_width1 2
#property indicator_color2 Red // down[]
#property indicator_width2 2
#property indicator_color3 DodgerBlue // atrlo[]
#property indicator_width3 1
#property indicator_color4 Red // atrhi[]
#property indicator_width4 1
#property indicator_color5 DodgerBlue // arrup[]
#property indicator_width5 1
#property indicator_color6 Red // arrdwn[]
#property indicator_width6 1

extern int Amplitude = 2;
extern bool ShowBars = true;
extern bool ShowArrows = true;
extern bool alertsOn = true;
extern bool alertsOnCurrent = false;
extern bool alertsMessage = true;
extern bool alertsSound = true;
extern bool alertsEmail = false;

bool nexttrend;
double minhighprice,maxlowprice;
double up[],down[],atrlo[],atrhi[],trend[];
double arrup[],arrdwn[];
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int init()
{
Comment(” Copyright ?2015 | FXProSystems.com”);
IndicatorBuffers(7); // +1 buffer – trend[]

SetIndexBuffer(0,up);
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(1,down);
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(2,atrlo);
SetIndexBuffer(3,atrhi);
SetIndexBuffer(6,trend);
SetIndexBuffer(4,arrup);
SetIndexBuffer(5,arrdwn);
SetIndexEmptyValue(0,0.0);
SetIndexEmptyValue(1,0.0);
SetIndexEmptyValue(6,0.0);

if(ShowBars)
{
SetIndexStyle(2,DRAW_HISTOGRAM, STYLE_SOLID);
SetIndexStyle(3,DRAW_HISTOGRAM, STYLE_SOLID);
}
else
{
SetIndexStyle(2,DRAW_NONE);
SetIndexStyle(3,DRAW_NONE);
}
if(ShowArrows)
{
SetIndexStyle(4,DRAW_ARROW,STYLE_SOLID); SetIndexArrow(4,233);
SetIndexStyle(5,DRAW_ARROW,STYLE_SOLID); SetIndexArrow(5,234);
}
else
{
SetIndexStyle(4,DRAW_NONE);
SetIndexStyle(5,DRAW_NONE);
}

nexttrend=0;
minhighprice= High[Bars-1];
maxlowprice = Low[Bars-1];
return (0);
}
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class CFix { } ExtFix;
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int start()
{
double atr,lowprice_i,highprice_i,lowma,highma;
int workbar=0;
int counted_bars=IndicatorCounted();
if(counted_bars<0) return(-1);
if(counted_bars>0) counted_bars–;
int limit = MathMin(Bars-counted_bars,Bars-1);

for(int i=Bars-1; i>=0; i–)
{
lowprice_i=iLow(Symbol(),Period(),iLowest(Symbol(),Period(),MODE_LOW,Amplitude,i));
highprice_i=iHigh(Symbol(),Period(),iHighest(Symbol(),Period(),MODE_HIGH,Amplitude,i));
lowma=NormalizeDouble(iMA(NULL,0,Amplitude,0,MODE_SMA,PRICE_LOW,i),Digits());
highma=NormalizeDouble(iMA(NULL,0,Amplitude,0,MODE_SMA,PRICE_HIGH,i),Digits());
trend[i]=trend[i+1];
atr=iATR(Symbol(),0,100,i)/2;

arrup[i] = EMPTY_VALUE;
arrdwn[i] = EMPTY_VALUE;
if(nexttrend==1)
{
maxlowprice=MathMax(lowprice_i,maxlowprice);

if(highma<maxlowprice && Close[i]<Low[i+1])
{
trend[i]=1.0;
nexttrend=0;
minhighprice=highprice_i;
}
}
if(nexttrend==0)
{
minhighprice=MathMin(highprice_i,minhighprice);

if(lowma>minhighprice && Close[i]>High[i+1])
{
trend[i]=0.0;
nexttrend=1;
maxlowprice=lowprice_i;
}
}
if(trend[i]==0.0)
{
if(trend[i+1]!=0.0)
{
up[i]=down[i+1];
up[i+1]=up[i];
arrup[i] = up[i] – 2*atr;
}
else
{
up[i]=MathMax(maxlowprice,up[i+1]);
}
atrhi[i] = up[i] – atr;
atrlo[i] = up[i];
down[i]=0.0;
}
else
{
if(trend[i+1]!=1.0)
{
down[i]=up[i+1];
down[i+1]=down[i];
arrdwn[i] = down[i] + 2*atr;
}
else
{
down[i]=MathMin(minhighprice,down[i+1]);
}
atrhi[i] = down[i] + atr;
atrlo[i] = down[i];
up[i]=0.0;
}
}
manageAlerts();
return (0);
}
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//
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void manageAlerts()
{
if (alertsOn)
{
if (alertsOnCurrent)
int whichBar = 0;
else whichBar = 1;
if (arrup[whichBar] != EMPTY_VALUE) doAlert(whichBar,”up”);
if (arrdwn[whichBar] != EMPTY_VALUE) doAlert(whichBar,”down”);
}
}

//
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void doAlert(int forBar, string doWhat)
{
static string previousAlert=”nothing”;
static datetime previousTime;
string message;

if (previousAlert != doWhat || previousTime != Time[forBar]) {
previousAlert = doWhat;
previousTime = Time[forBar];

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message = StringConcatenate(Symbol(),” at “,TimeToStr(TimeLocal(),TIME_SECONDS),” HalfTrend signal “,doWhat);
if (alertsMessage) Alert(message);
if (alertsEmail) SendMail(StringConcatenate(Symbol(),”HalfTrend “),message);
if (alertsSound) PlaySound(“alert2.wav”);
}
}