很不错的指标
int OnInit(void){
//--- 1 additional buffer used for counting.
IndicatorBuffers(4);
IndicatorDigits(Digits);
//--- middle line
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0,ExtMovingBuffer);
SetIndexShift(0,InpBandsShift);
SetIndexLabel(0,"Bands SMA");
//--- upper band
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(1,ExtUpperBuffer);
SetIndexShift(1,InpBandsShift);
SetIndexLabel(1,"Bands Upper");
//--- lower band
SetIndexStyle(2,DRAW_LINE);
SetIndexBuffer(2,ExtLowerBuffer);
SetIndexShift(2,InpBandsShift);
SetIndexLabel(2,"Bands Lower");
//--- work buffer
SetIndexBuffer(3,ExtStdDevBuffer);
//--- check for input parameter
if(InpBandsPeriod<=0)
{
Print("Wrong input parameter Bands Period=",InpBandsPeriod);
return(INIT_FAILED);
}
//---
SetIndexDrawBegin(0,InpBandsPeriod+InpBandsShift);
SetIndexDrawBegin(1,InpBandsPeriod+InpBandsShift);
SetIndexDrawBegin(2,InpBandsPeriod+InpBandsShift);
//--- initialization done
return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
//| Bollinger Bands |
//+------------------------------------------------------------------+
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,pos;
//---
if(rates_total<=InpBandsPeriod || InpBandsPeriod<=0)
return(0);
//--- counting from 0 to rates_total
ArraySetAsSeries(ExtMovingBuffer,false);
ArraySetAsSeries(ExtUpperBuffer,false);
ArraySetAsSeries(ExtLowerBuffer,false);
ArraySetAsSeries(ExtStdDevBuffer,false);
ArraySetAsSeries(close,false);
//--- initial zero
if(prev_calculated<1)
{
for(i=0; i<InpBandsPeriod; i++)
{
ExtMovingBuffer=EMPTY_VALUE;
ExtUpperBuffer=EMPTY_VALUE;
ExtLowerBuffer=EMPTY_VALUE;
}
}
//--- starting calculation
if(prev_calculated>1)
pos=prev_calculated-1;
else
pos=0;
//--- main cycle
for(i=pos; i<rates_total && !IsStopped(); i++)
{
//--- middle line
ExtMovingBuffer=SimpleMA(i,InpBandsPeriod,close);
//--- calculate and write down StdDev
ExtStdDevBuffer=StdDev_Func(i,close,ExtMovingBuffer,InpBandsPeriod);
//--- upper line
ExtUpperBuffer=ExtMovingBuffer+InpBandsDeviations*ExtStdDevBuffer;
//--- lower line
ExtLowerBuffer=ExtMovingBuffer-InpBandsDeviations*ExtStdDevBuffer;
//---
}
//---- OnCalculate done. Return new prev_calculated.
return(rates_total);
}
//+------------------------------------------------------------------+
//| Calculate Standard Deviation |
//+------------------------------------------------------------------+
double StdDev_Func(int position,const double &price[],const double &MAprice[],int period)
{
//--- variables
double StdDev_dTmp=0.0;
//--- check for position
if(position>=period)
{
//--- calcualte StdDev
for(int i=0; i<period; i++)
StdDev_dTmp+=MathPow(price-MAprice,2);
StdDev_dTmp=MathSqrt(StdDev_dTmp/period);
}
//--- return calculated value
return(StdDev_dTmp);
}
//+------------------------------------------------------------------+
麻烦上图！！！！
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