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saherelm
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//+------------------------------------------------------------------+
//| Custom Moving Averages.mq4 |
//| Copyright 2005-2015, MetaQuotes Software Corp. |
//| http://www.mql4.com |
//+------------------------------------------------------------------+
#property copyright "2005-2015, MetaQuotes Software Corp."
#property link "http://www.mql4.com"
#property description "Moving Average"
#property strict
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 Red
//--- indicator parameters
input int InpMAPeriod=13; // Period
input int InpMAShift=0; // Shift
input ENUM_MA_METHOD InpMAMethod=MODE_SMA; // Method
//--- indicator buffer
double ExtLineBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int OnInit(void)
{
string short_name;
int draw_begin=InpMAPeriod-1;
//--- indicator short name
switch(InpMAMethod)
{
case MODE_SMA : short_name="SMA("; break;
case MODE_EMA : short_name="EMA("; draw_begin=0; break;
case MODE_SMMA : short_name="SMMA("; break;
case MODE_LWMA : short_name="LWMA("; break;
default : return(INIT_FAILED);
}
IndicatorShortName(short_name+string(InpMAPeriod)+")");
IndicatorDigits(Digits);
//--- check for input
if(InpMAPeriod<2)
return(INIT_FAILED);
//--- drawing settings
SetIndexStyle(0,DRAW_LINE);
SetIndexShift(0,InpMAShift);
SetIndexDrawBegin(0,draw_begin);
//--- indicator buffers mapping
SetIndexBuffer(0,ExtLineBuffer);
//--- initialization done
return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
//| Moving Average |
//+------------------------------------------------------------------+
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[])
{
//--- check for bars count
if(rates_total<InpMAPeriod-1 || InpMAPeriod<2)
return(0);
//--- counting from 0 to rates_total
ArraySetAsSeries(ExtLineBuffer,false);
ArraySetAsSeries(close,false);
//--- first calculation or number of bars was changed
if(prev_calculated==0)
ArrayInitialize(ExtLineBuffer,0);
//--- calculation
switch(InpMAMethod)
{
case MODE_EMA: CalculateEMA(rates_total,prev_calculated,close); break;
case MODE_LWMA: CalculateLWMA(rates_total,prev_calculated,close); break;
case MODE_SMMA: CalculateSmoothedMA(rates_total,prev_calculated,close); break;
case MODE_SMA: CalculateSimpleMA(rates_total,prev_calculated,close); break;
}
//--- return value of prev_calculated for next call
return(rates_total);
}
//+------------------------------------------------------------------+
//| simple moving average |
//+------------------------------------------------------------------+
void CalculateSimpleMA(int rates_total,int prev_calculated,const double &price[])
{
int i,limit;
//--- first calculation or number of bars was changed
if(prev_calculated==0)
{
limit=InpMAPeriod;
//--- calculate first visible value
double firstValue=0;
for(i=0; i<limit; i++)
firstValue+=price[i];
firstValue/=InpMAPeriod;
ExtLineBuffer[limit-1]=firstValue;
}
else
limit=prev_calculated-1;
//--- main loop
for(i=limit; i<rates_total && !IsStopped(); i++)
ExtLineBuffer[i]=ExtLineBuffer[i-1]+(price[i]-price[i-InpMAPeriod])/InpMAPeriod;
//---
}
//+------------------------------------------------------------------+
//| exponential moving average |
//+------------------------------------------------------------------+
void CalculateEMA(int rates_total,int prev_calculated,const double &price[])
{
int i,limit;
double SmoothFactor=2.0/(1.0+InpMAPeriod);
//--- first calculation or number of bars was changed
if(prev_calculated==0)
{
limit=InpMAPeriod;
ExtLineBuffer[0]=price[0];
for(i=1; i<limit; i++)
ExtLineBuffer[i]=price[i]*SmoothFactor+ExtLineBuffer[i-1]*(1.0-SmoothFactor);
}
else
limit=prev_calculated-1;
//--- main loop
for(i=limit; i<rates_total && !IsStopped(); i++)
ExtLineBuffer[i]=price[i]*SmoothFactor+ExtLineBuffer[i-1]*(1.0-SmoothFactor);
//---
}
//+------------------------------------------------------------------+
//| linear weighted moving average |
//+------------------------------------------------------------------+
void CalculateLWMA(int rates_total,int prev_calculated,const double &price[])
{
int i,limit;
static int weightsum;
double sum;
//--- first calculation or number of bars was changed
if(prev_calculated==0)
{
weightsum=0;
limit=InpMAPeriod;
//--- calculate first visible value
double firstValue=0;
for(i=0;i<limit;i++)
{
int k=i+1;
weightsum+=k;
firstValue+=k*price[i];
}
firstValue/=(double)weightsum;
ExtLineBuffer[limit-1]=firstValue;
}
else
limit=prev_calculated-1;
//--- main loop
for(i=limit; i<rates_total && !IsStopped(); i++)
{
sum=0;
for(int j=0;j<InpMAPeriod;j++)
sum+=(InpMAPeriod-j)*price[i-j];
ExtLineBuffer[i]=sum/weightsum;
}
//---
}
//+------------------------------------------------------------------+
//| smoothed moving average |
//+------------------------------------------------------------------+
void CalculateSmoothedMA(int rates_total,int prev_calculated,const double &price[])
{
int i,limit;
//--- first calculation or number of bars was changed
if(prev_calculated==0)
{
limit=InpMAPeriod;
double firstValue=0;
for(i=0; i<limit; i++)
firstValue+=price[i];
firstValue/=InpMAPeriod;
ExtLineBuffer[limit-1]=firstValue;
}
else
limit=prev_calculated-1;
//--- main loop
for(i=limit; i<rates_total && !IsStopped(); i++)
ExtLineBuffer[i]=(ExtLineBuffer[i-1]*(InpMAPeriod-1)+price[i])/InpMAPeriod;
//---
}
//+------------------------------------------------------------------+