//+------------------------------------------------------------------+
//| BandsBandwidth.mq4 |
//| Copyright © 2009, Investors Haven |
//| |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2009, Investors Haven"
#property link ""
#property indicator_separate_window
#property indicator_minimum 0
#property indicator_maximum 10000
#property indicator_buffers 1
#property indicator_color1 LightSeaGreen
#property indicator_width1 2
#property indicator_style1 0
//---- indicator parameters
extern int BandsPeriod=20;
extern int BandsShift=0;
extern double BandsDeviations=2.0;
//---- buffers
double MovingBuffer[];
double UpperBuffer[];
double LowerBuffer[];
double Bandwidth[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- 3 additional buffers are used for counting.
IndicatorBuffers(4);
//---- indicators
SetIndexStyle(0, DRAW_LINE);
SetIndexBuffer(0,Bandwidth);
SetIndexStyle(1,12);
SetIndexBuffer(1,MovingBuffer);
SetIndexStyle(2,12);
SetIndexBuffer(2,UpperBuffer);
SetIndexStyle(3,12);
SetIndexBuffer(3,LowerBuffer);
//----
SetIndexDrawBegin(0,BandsPeriod+BandsShift);
SetIndexDrawBegin(1,BandsPeriod+BandsShift);
SetIndexDrawBegin(2,BandsPeriod+BandsShift);
SetIndexDrawBegin(3,BandsPeriod+BandsShift);
IndicatorShortName("Bollinger Bandwidth");
IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS) - 5);
return(0);
}
//+------------------------------------------------------------------+
//| Bollinger Bands |
//+------------------------------------------------------------------+
int start()
{
int i,k,counted_bars=IndicatorCounted();
double deviation;
double sum,oldval,newres;
Print("here");
//----
if(Bars<=BandsPeriod) return(0);
//---- initial zero
if(counted_bars<1)
for(i=1;i<=BandsPeriod;i++)
{
MovingBuffer[Bars-i]=EMPTY_VALUE;
UpperBuffer[Bars-i]=EMPTY_VALUE;
LowerBuffer[Bars-i]=EMPTY_VALUE;
Bandwidth[Bars-i]=EMPTY_VALUE;
Print("Buffers cleaned");
}
//----
int limit=Bars-counted_bars;
if(counted_bars>0) limit++;
for(i=0; i<limit; i++)
MovingBuffer[i]=iMA(NULL,0,BandsPeriod,BandsShift,MODE_SMA,PRICE_CLOSE,i);
//----
i=Bars-BandsPeriod+1;
if(counted_bars>BandsPeriod-1) i=Bars-counted_bars-1;
Print("i is:", i);
while(i>=0)
{
sum=0.0;
k=i+BandsPeriod-1;
oldval=MovingBuffer[i];
while(k>=i)
{
newres=Close[k]-oldval;
sum+=newres*newres;
k--;
}
deviation=BandsDeviations*MathSqrt(sum/BandsPeriod);
UpperBuffer[i]=oldval+deviation;
Print("UpperBuffer is:", UpperBuffer[i]);
LowerBuffer[i]=oldval-deviation;
Print("LowerBuffer is:", LowerBuffer[i]);
Bandwidth[i]=MathFloor((UpperBuffer[i] - LowerBuffer[i])*10000);
Print("Bandwidth is:", Bandwidth[i]);
i--;
}
//----
return(0);
}
//+------------------------------------------------------------------+
Sample
Analysis
Market Information Used:
Series array that contains close prices for each bar
Indicator Curves created:
Implements a curve of type DRAW_LINE
Implements a curve of type 12
Indicators Used:
Moving average indicator
Custom Indicators Used:
Order Management characteristics:
Other Features: