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//+------------------------------------------------------------------+
//| ROC.mq5 |
//| Copyright 2009-2017, MetaQuotes Software Corp. |
//| http://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "2009-2017, MetaQuotes Software Corp."
#property link "http://www.mql5.com"
#property description "Rate of Change"
//--- indicator settings
#property indicator_separate_window
#property indicator_buffers 1
#property indicator_plots 1
#property indicator_type1 DRAW_LINE
#property indicator_color1 LightSeaGreen
//--- input parameters
input int InpRocPeriod=12; // Period
//--- indicator buffers
double ExtRocBuffer[];
//--- global variable
int ExtRocPeriod;
//+------------------------------------------------------------------+
//| Rate of Change initialization function |
//+------------------------------------------------------------------+
void OnInit()
{
//--- check for input
if(InpRocPeriod<1)
{
ExtRocPeriod=12;
Print("Incorrect value for input variable InpRocPeriod =",InpRocPeriod,
"Indicator will use value =",ExtRocPeriod,"for calculations.");
}
else ExtRocPeriod=InpRocPeriod;
//--- indicator buffers mapping
SetIndexBuffer(0,ExtRocBuffer,INDICATOR_DATA);
//--- set accuracy
IndicatorSetInteger(INDICATOR_DIGITS,2);
//--- name for DataWindow and indicator subwindow label
IndicatorSetString(INDICATOR_SHORTNAME,"ROC("+string(ExtRocPeriod)+")");
//--- sets first bar from what index will be drawn
PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,ExtRocPeriod);
//--- initialization done
}
//+------------------------------------------------------------------+
//| Rate of Change |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,const int prev_calculated,const int begin,const double &price[])
{
//--- check for rates count
if(rates_total<ExtRocPeriod)
return(0);
//--- preliminary calculations
int pos=prev_calculated-1; // set calc position
if(pos<ExtRocPeriod)
pos=ExtRocPeriod;
//--- the main loop of calculations
for(int i=pos;i<rates_total && !IsStopped();i++)
{
if(price[i]==0.0)
ExtRocBuffer[i]=0.0;
else
ExtRocBuffer[i]=(price[i]-price[i-ExtRocPeriod])/price[i]*100;
}
//--- OnCalculate done. Return new prev_calculated.
return(rates_total);
}
//+------------------------------------------------------------------+
Trying to convert this simple indicator to work with mt4.