Indicators: Envelopes, Env
Hi,
Thanks for this developing this indicator and sharing it.
Is it possible to change the MA method to Smoothed or Linear weighted or Exponential?
buccas13:
Hi,
Thanks for this developing this indicator and sharing it.
Is it possible to change the MA method to Smoothed or Linear weighted or Exponential?
You could call any of the Ma functions from this code sample, to use in the Envelopes indicator.
//+------------------------------------------------------------------+ //| Custom Moving Average.mq4 | //| Copyright © 2004, MetaQuotes Software Corp. | //| http://www.metaquotes.net/ | //+------------------------------------------------------------------+ #property copyright "Copyright © 2004, MetaQuotes Software Corp." #property link "http://www.metaquotes.net/" #property indicator_chart_window #property indicator_buffers 1 #property indicator_color1 Red //---- indicator parameters extern int MA_Period=13; extern int MA_Shift=0; extern int MA_Method=0; //---- indicator buffers double ExtMapBuffer[]; //---- int ExtCountedBars=0; //+------------------------------------------------------------------+ //| Custom indicator initialization function | //+------------------------------------------------------------------+ int init() { int draw_begin; string short_name; //---- drawing settings SetIndexStyle(0,DRAW_LINE); SetIndexShift(0,MA_Shift); IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS)); if(MA_Period<2) MA_Period=13; draw_begin=MA_Period-1; //---- indicator short name switch(MA_Method) { case 1 : short_name="EMA("; draw_begin=0; break; case 2 : short_name="SMMA("; break; case 3 : short_name="LWMA("; break; default : MA_Method=0; short_name="SMA("; } IndicatorShortName(short_name+MA_Period+")"); SetIndexDrawBegin(0,draw_begin); //---- indicator buffers mapping SetIndexBuffer(0,ExtMapBuffer); //---- initialization done return(0); } //+------------------------------------------------------------------+ //| | //+------------------------------------------------------------------+ int start() { if(Bars<=MA_Period) return(0); ExtCountedBars=IndicatorCounted(); //---- check for possible errors if (ExtCountedBars<0) return(-1); //---- last counted bar will be recounted if (ExtCountedBars>0) ExtCountedBars--; //---- switch(MA_Method) { case 0 : sma(); break; case 1 : ema(); break; case 2 : smma(); break; case 3 : lwma(); } //---- done return(0); } //+------------------------------------------------------------------+ //| Simple Moving Average | //+------------------------------------------------------------------+ void sma() { double sum=0; int i,pos=Bars-ExtCountedBars-1; //---- initial accumulation if(pos<MA_Period) pos=MA_Period; for(i=1;i<MA_Period;i++,pos--) sum+=Close[pos]; //---- main calculation loop while(pos>=0) { sum+=Close[pos]; ExtMapBuffer[pos]=sum/MA_Period; sum-=Close[pos+MA_Period-1]; pos--; } //---- zero initial bars if(ExtCountedBars<1) for(i=1;i<MA_Period;i++) ExtMapBuffer[Bars-i]=0; } //+------------------------------------------------------------------+ //| Exponential Moving Average | //+------------------------------------------------------------------+ void ema() { double pr=2.0/(MA_Period+1); int pos=Bars-2; if(ExtCountedBars>2) pos=Bars-ExtCountedBars-1; //---- main calculation loop while(pos>=0) { if(pos==Bars-2) ExtMapBuffer[pos+1]=Close[pos+1]; ExtMapBuffer[pos]=Close[pos]*pr+ExtMapBuffer[pos+1]*(1-pr); pos--; } } //+------------------------------------------------------------------+ //| Smoothed Moving Average | //+------------------------------------------------------------------+ void smma() { double sum=0; int i,k,pos=Bars-ExtCountedBars+1; //---- main calculation loop pos=Bars-MA_Period; if(pos>Bars-ExtCountedBars) pos=Bars-ExtCountedBars; while(pos>=0) { if(pos==Bars-MA_Period) { //---- initial accumulation for(i=0,k=pos;i<MA_Period;i++,k++) { sum+=Close[k]; //---- zero initial bars ExtMapBuffer[k]=0; } } else sum=ExtMapBuffer[pos+1]*(MA_Period-1)+Close[pos]; ExtMapBuffer[pos]=sum/MA_Period; pos--; } } //+------------------------------------------------------------------+ //| Linear Weighted Moving Average | //+------------------------------------------------------------------+ void lwma() { double sum=0.0,lsum=0.0; double price; int i,weight=0,pos=Bars-ExtCountedBars-1; //---- initial accumulation if(pos<MA_Period) pos=MA_Period; for(i=1;i<=MA_Period;i++,pos--) { price=Close[pos]; sum+=price*i; lsum+=price; weight+=i; } //---- main calculation loop pos++; i=pos+MA_Period; while(pos>=0) { ExtMapBuffer[pos]=sum/weight; if(pos==0) break; pos--; i--; price=Close[pos]; sum=sum-lsum+price*MA_Period; lsum-=Close[i]; lsum+=price; } //---- zero initial bars if(ExtCountedBars<1) for(i=1;i<MA_Period;i++) ExtMapBuffer[Bars-i]=0; } //+------------------------------------------------------------------+
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Envelopes, Env:
Envelopes technical indicator is formed with two Moving Averages one of which is shifted upward and another one is shifted downward.
Author: MetaQuotes Software Corp.