Volumes indicator from MT4

[[Deleted]]

Volumes indicator from MT4.

I would like to understand what does green and red bar mean . Please Coders how I should interpret red bar or green bar, can you help me please. I can not find anywere explanation of this indi. I would be gratefull for help.

Here is the code.

//+------------------------------------------------------------------+
//| Volumes.mq4 |
//| Copyright © 2005, MetaQuotes Software Corp. |
//| http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2005, MetaQuotes Software Corp."
#property link "http://www.metaquotes.net/"
//---- indicator settings
#property indicator_separate_window
#property indicator_minimum 0
#property indicator_buffers 3
#property indicator_color1 Black
#property indicator_color2 Green
#property indicator_color3 Red
#property indicator_width2 2
#property indicator_width3 2
//---- indicator buffers
double ExtVolumesBuffer[];
double ExtVolumesUpBuffer[];
double ExtVolumesDownBuffer[];

//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- indicator buffers mapping
SetIndexBuffer(0,ExtVolumesBuffer);
SetIndexBuffer(1,ExtVolumesUpBuffer);
SetIndexBuffer(2,ExtVolumesDownBuffer);
//---- drawing settings
SetIndexStyle(0,DRAW_NONE);
SetIndexStyle(1,DRAW_HISTOGRAM);
SetIndexStyle(2,DRAW_HISTOGRAM);
//---- sets default precision format for indicators visualization
IndicatorDigits(0);
//---- name for DataWindow and indicator subwindow label
IndicatorShortName("Volumes");
SetIndexLabel(0,"Volumes");
SetIndexLabel(1,NULL);
SetIndexLabel(2,NULL);
//---- sets drawing line empty value
SetIndexEmptyValue(1,0.0);
SetIndexEmptyValue(2,0.0);
//---- initialization done
return(0);
}
//+------------------------------------------------------------------+
//| Volumes |
//+------------------------------------------------------------------+
int start()
{
int i,nLimit,nCountedBars;
//---- bars count that does not changed after last indicator launch.
nCountedBars=IndicatorCounted();
//---- last counted bar will be recounted
if(nCountedBars>0) nCountedBars--;
nLimit=Bars-nCountedBars;
//----
for(i=0; i<nLimit; i++)
{
double dVolume=Volume[i];
if(i==Bars-1 || dVolume>Volume[i+1])
{
ExtVolumesBuffer[i]=dVolume;
ExtVolumesUpBuffer[i]=dVolume;
ExtVolumesDownBuffer[i]=0.0;
}
else
{
ExtVolumesBuffer[i]=dVolume;
ExtVolumesUpBuffer[i]=0.0;
ExtVolumesDownBuffer[i]=dVolume;
}
}
//---- done
return(0);
}
//+------------------------------------------------------------------+