Awesome

//+——————————————————————+
//| Awesome.mq4 |
//| Copyright 2005-2014, MetaQuotes Software Corp. |
//| http://www.mql4.com |
//+——————————————————————+
#property copyright “2005-2014, MetaQuotes Software Corp.”
#property link “http://www.mql4.com”
#property description “Awesome Oscillator”
#property strict

//— indicator settings
#property indicator_separate_window
#property indicator_buffers 3
#property indicator_color1 Black
#property indicator_color2 Green
#property indicator_color3 Red
//— buffers
double ExtAOBuffer[];
double ExtUpBuffer[];
double ExtDnBuffer[];
//—
#define PERIOD_FAST 5
#define PERIOD_SLOW 34
//— bars minimum for calculation
#define DATA_LIMIT 34
//+——————————————————————+
//| Custom indicator initialization function |
//+——————————————————————+
void OnInit(void)
{
//— drawing settings
SetIndexStyle(0,DRAW_NONE);
SetIndexStyle(1,DRAW_HISTOGRAM);
SetIndexStyle(2,DRAW_HISTOGRAM);
IndicatorDigits(Digits+1);
SetIndexDrawBegin(0,DATA_LIMIT);
SetIndexDrawBegin(1,DATA_LIMIT);
SetIndexDrawBegin(2,DATA_LIMIT);
//— 3 indicator buffers mapping
SetIndexBuffer(0,ExtAOBuffer);
SetIndexBuffer(1,ExtUpBuffer);
SetIndexBuffer(2,ExtDnBuffer);
//— name for DataWindow and indicator subwindow label
IndicatorShortName(“AO”);
SetIndexLabel(1,NULL);
SetIndexLabel(2,NULL);
}
//+——————————————————————+
//| Awesome Oscillator |
//+——————————————————————+
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,limit=rates_total-prev_calculated;
double prev=0.0,current;
//— check for rates total
if(rates_total<=DATA_LIMIT)
return(0);
//— last counted bar will be recounted
if(prev_calculated>0)
{
limit++;
prev=ExtAOBuffer[limit];
}
//— macd
for(i=0; i<limit; i++)
ExtAOBuffer[i]=iMA(NULL,0,PERIOD_FAST,0,MODE_SMA,PRICE_MEDIAN,i)-
iMA(NULL,0,PERIOD_SLOW,0,MODE_SMA,PRICE_MEDIAN,i);
//— dispatch values between 2 buffers
bool up=true;
for(i=limit-1; i>=0; i–)
{
current=ExtAOBuffer[i];
if(current>prev)
up=true;
if(current<prev)
up=false;
if(!up)
{
ExtDnBuffer[i]=current;
ExtUpBuffer[i]=0.0;
}
else
{
ExtUpBuffer[i]=current;
ExtDnBuffer[i]=0.0;
}
prev=current;
}
//— done
return(rates_total);
}
//+——————————————————————+