Custom ROC indicator help required

[[Deleted]]

I have a ROC price indicator. How simple is it to change the instrument from price to ATR indicator? So that the new indicator monitors the ROC of the ATR? Code:

//+------------------------------------------------------------------+

//| ROC.mq4 |

//| Copyright © 2006, Robert Hill |

//+------------------------------------------------------------------+

#property copyright "Copyright © 2006, Robert Hill"

//---- indicator settings

#property indicator_separate_window

#property indicator_buffers 1

#property indicator_color1 Red

//---- indicator parameters

extern int RPeriod = 10;

extern bool UsePercent = false;

//---- indicator buffers

double RateOfChange[];

//+------------------------------------------------------------------+

//| Custom indicator initialization function |

//+------------------------------------------------------------------+

int init()

{

//---- drawing settings

SetIndexStyle(0, DRAW_LINE);

SetIndexDrawBegin(0, RPeriod);

IndicatorDigits(Digits + 1);

//---- indicator buffers mapping

if(!SetIndexBuffer(0, RateOfChange))

Print("cannot set indicator buffers!");

//---- name for DataWindow and indicator subwindow label

IndicatorShortName("ROC(" + RPeriod + ")");

//---- initialization done

return(0);

}

//+------------------------------------------------------------------+

//| Moving Averages Convergence/Divergence |

//+------------------------------------------------------------------+

int start()

{

int limit;

double ROC, CurrentClose, PrevClose;

int counted_bars = IndicatorCounted();

//---- check for possible errors

if(counted_bars < 0)

return(-1);

//---- last counted bar will be recounted

if(counted_bars > 0)

counted_bars--;

limit = Bars - counted_bars - RPeriod;

//---- ROC calculation

for(int i = limit; i >= 0; i--)

{

CurrentClose = iClose(NULL, 0, i);

PrevClose = iClose(NULL, 0, i + RPeriod);

ROC = CurrentClose - PrevClose;

//----

if(UsePercent)

{

if(PrevClose != 0)

RateOfChange[i] = 100 * ROC / PrevClose;

}

else

RateOfChange[i] = ROC;

}

//---- done

return(0);

}

//+------------------------------------------------------------------+

[Ubzen]

That depends. How much experience do you have writing indicators?

[William Roeder]

1. 

   ---

2. // CurrentClose = iClose(NULL, 0, i);
   // PrevClose    = iClose(NULL, 0, i + RPeriod);
   CurrentClose = iATR(NULL, 0, i);
   PrevClose    = iATR(NULL, 0, i + RPeriod);