Here is the code for a Historical Volatility Alert that I created. I need to play around with it a bit more but , it was fairly easy to do. Feel free to change it around for your personal use.
Code: Select all
#property copyright ""
#property link ""
#property version "1.00"
#property description ""
#include <stdlib.mqh>
#include <stderror.mqh>
//--- indicator settings
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_type1 DRAW_ARROW
#property indicator_width1 1
#property indicator_color1 0xFFAA00
#property indicator_label1 "Buy"
//--- indicator buffers
double Buffer1[];
datetime time_alert; //used when sending alert
double myPoint; //initialized in OnInit
void myAlert(string type, string message)
{
if(type == "print")
Print(message);
else if(type == "error")
{
Print(type+" | HV @ "+Symbol()+","+Period()+" | "+message);
}
else if(type == "order")
{
}
else if(type == "modify")
{
}
else if(type == "indicator")
{
Print(type+" | HV @ "+Symbol()+","+Period()+" | "+message);
}
}
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int OnInit()
{
IndicatorBuffers(1);
SetIndexBuffer(0, Buffer1);
SetIndexEmptyValue(0, 0);
SetIndexArrow(0, 241);
//initialize myPoint
myPoint = Point();
if(Digits() == 5 || Digits() == 3)
{
myPoint *= 10;
}
return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
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 limit = rates_total - prev_calculated;
//--- counting from 0 to rates_total
ArraySetAsSeries(Buffer1, true);
//--- initial zero
if(prev_calculated < 1)
{
ArrayInitialize(Buffer1, 0);
}
else
limit++;
//--- main loop
for(int i = limit-1; i >= 0; i--)
{
if (i >= MathMin(5000-1, rates_total-1-50)) continue; //omit some old rates to prevent "Array out of range" or slow calculation
//Indicator Buffer 1
if(iCustom(NULL, PERIOD_CURRENT, "HistVolatility6", 8, 365, true, 0, 1000, 1, 0, i) > 18 //HistVolatility6 > fixed value
)
{
Buffer1[i] = Open[1+i] - iATR(NULL, PERIOD_CURRENT, 14, i); //Set indicator value at Candlestick Open - Average True Range
if(i == 0 && Time[0] != time_alert) { myAlert("indicator", "Buy"); time_alert = Time[0]; } //Instant alert, only once per bar
}
else
{
Buffer1[i] = 0;
}
}
return(rates_total);
}
//+------------------------------------------------------------------+