#property copyright "2005-2014, MetaQuotes Software Corp."
#property link "http://www.mql4.com"
#property description "Stochastic Oscillator"
#property strict
#property indicator_separate_window
#property indicator_minimum 0
#property indicator_maximum 100
#property indicator_buffers 2
#property indicator_color1 LightSeaGreen
#property indicator_color2 Red
#property indicator_level1 20.0
#property indicator_level2 80.0
#property indicator_levelcolor clrSilver
#property indicator_levelstyle STYLE_DOT
//--- input parameters
input int InpKPeriod=5; // K Period
input int InpDPeriod=3; // D Period
input int InpSlowing=3; // Slowing
//--- buffers
double ExtMainBuffer[];
double ExtSignalBuffer[];
double ExtHighesBuffer[];
double ExtLowesBuffer[];
//---
int draw_begin1=0;
int draw_begin2=0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int OnInit(void)
{
string short_name;
//--- 2 additional buffers are used for counting.
IndicatorBuffers(4);
SetIndexBuffer(2, ExtHighesBuffer);
SetIndexBuffer(3, ExtLowesBuffer);
//--- indicator lines
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0, ExtMainBuffer);
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(1, ExtSignalBuffer);
//--- name for DataWindow and indicator subwindow label
short_name="Sto("+IntegerToString(InpKPeriod)+","+IntegerToString(InpDPeriod)+","+IntegerToString(InpSlowing)+")";
IndicatorShortName(short_name);
SetIndexLabel(0,short_name);
SetIndexLabel(1,"Signal");
//---
draw_begin1=InpKPeriod+InpSlowing;
draw_begin2=draw_begin1+InpDPeriod;
SetIndexDrawBegin(0,draw_begin1);
SetIndexDrawBegin(1,draw_begin2);
//--- initialization done
return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
//| Stochastic oscillator |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
const int prev_calculated,
const datetime &time[],
const double &open[],
const double &high[],
const double &low[],
const double &close[],
const long &tick_volume[],
const long &volume[],
const int &spread[])
{
int i,k,pos;
//--- check for bars count
if(rates_total<=InpKPeriod+InpDPeriod+InpSlowing)
return(0);
//--- counting from 0 to rates_total
ArraySetAsSeries(ExtMainBuffer,false);
ArraySetAsSeries(ExtSignalBuffer,false);
ArraySetAsSeries(ExtHighesBuffer,false);
ArraySetAsSeries(ExtLowesBuffer,false);
ArraySetAsSeries(low,false);
ArraySetAsSeries(high,false);
ArraySetAsSeries(close,false);
//---
pos=InpKPeriod-1;
if(pos+1<prev_calculated)
pos=prev_calculated-2;
else
{
for(i=0; i<pos; i++)
{
ExtLowesBuffer[i]=0.0;
ExtHighesBuffer[i]=0.0;
}
}
//--- calculate HighesBuffer[] and ExtHighesBuffer[]
for(i=pos; i<rates_total && !IsStopped(); i++)
{
double dmin=1000000.0;
double dmax=-1000000.0;
for(k=i-InpKPeriod+1; k<=i; k++)
{
if(dmin>low[k])
dmin=low[k];
if(dmax<high[k])
dmax=high[k];
}
ExtLowesBuffer[i]=dmin;
ExtHighesBuffer[i]=dmax;
}
//--- %K line
pos=InpKPeriod-1+InpSlowing-1;
if(pos+1<prev_calculated)
pos=prev_calculated-2;
else
{
for(i=0; i<pos; i++)
ExtMainBuffer[i]=0.0;
}
//--- main cycle
for(i=pos; i<rates_total && !IsStopped(); i++)
{
double sumlow=0.0;
double sumhigh=0.0;
for(k=(i-InpSlowing+1); k<=i; k++)
{
sumlow +=(close[k]-ExtLowesBuffer[k]);
sumhigh+=(ExtHighesBuffer[k]-ExtLowesBuffer[k]);
}
if(sumhigh==0.0)
ExtMainBuffer[i]=100.0;
else
ExtMainBuffer[i]=sumlow/sumhigh*100.0;
}
//--- signal
pos=InpDPeriod-1;
if(pos+1<prev_calculated)
pos=prev_calculated-2;
else
{
for(i=0; i<pos; i++)
ExtSignalBuffer[i]=0.0;
}
for(i=pos; i<rates_total && !IsStopped(); i++)
{
double sum=0.0;
for(k=0; k<InpDPeriod; k++)
sum+=ExtMainBuffer[i-k];
ExtSignalBuffer[i]=sum/InpDPeriod;
}
//--- OnCalculate done. Return new prev_calculated.
return(rates_total);
}
