In this post, I am going to show you How to create a custom forex indicator for MT4. But if you learn how to, please note that the code below is given for educational purposes and if you want to to use it for commercial/ selling, you need to attribute the source. The code is licensed under creatives common…. Simply add https://keithrainz.me/ when giving it out.
We are going to create a Belly System simple indicator
This is part 1 of coding an indicator like belly system. For part 2, simply like the video, comment part 2, subscribe to my channel and share the video. will release part 2 when the video below gets 1k views.
Requirements to create a custom forex indicator for MT4
- You will need MT4 installed
- An internet connection.
How to create a custom forex indicator for MT4?
Watch the video below and get the error-free well coded source code.
//---- File Properties
#property copyright "Keith Rainz"
#property link "https://keithrainz.me/how-to-create-a-custom-forex-indicator-for-mt4/"
#property description "belly system-like indicator that plots breakout arrows."
#property version "1.0"
#property strict
//---- Indicator drawing and buffers
#property indicator_chart_window
#property indicator_buffers 2
//---- Colors and sizes for buffers
#property indicator_color1 clrDodgerBlue
#property indicator_color2 clrTomato
#property indicator_width1 2
#property indicator_width2 2
//---- Buffer Arrays
double ExtMapBuffer1[];
double ExtMapBuffer2[];
//+------------------------------------------
//| Custom indicator initialization function
//+------------------------------------------
int init()
{
// First buffer
SetIndexBuffer(0, ExtMapBuffer1); // Assign buffer array
SetIndexStyle(0, DRAW_ARROW); // Style to arrow
SetIndexArrow(0, 233); // Arrow code
//Second buffer
SetIndexBuffer(1, ExtMapBuffer2); // Assign buffer array
SetIndexStyle(1, DRAW_ARROW); // Style to arrow
SetIndexArrow(1, 234); // Arrow code
// Exit
return(0);
}
//+-------------------------------------
//| 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[])
{
// Start and limit
int start = 1;
int limit;
// Bars counted so far
int counted_bars = IndicatorCounted();
// No more bars?
if(counted_bars < 0)
return(-1);
// Do not check repeated bars
limit = Bars - 1 - counted_bars;
// Iterate bars from past to present
for(int i = limit; i >= start; i--)
{
// If not enough data...
if(i > Bars-2) continue;
// Check buy signal
if(Close[i] > High[i+1])
{
ExtMapBuffer1[i] = Low[i];
}
// Sell check signal
if(Close[i] < Low[i+1])
{
ExtMapBuffer2[i] = High[i];
}
}
// Exit
return(rates_total);
}
