//+------------------------------------------------------------------+ //| Negative Volume Index.mq5 | //| Copyright © 2011, Nikolay Kositsin | //| Khabarovsk, farria@mail.redcom.ru | //+------------------------------------------------------------------+ //---- author of the indicator #property copyright "Copyright © 2011, Nikolay Kositsin" //---- link to the website of the author #property link "farria@mail.redcom.ru" #property description "Negative Volume Index" //---- indicator version #property version "1.00" //---- drawing the indicator in a separate window #property indicator_separate_window //---- 1 buffer is used for calculation and drawing the indicator #property indicator_buffers 1 //---- 1 plot is used #property indicator_plots 1 //+----------------------------------------------+ //| Indicator drawing parameters | //+----------------------------------------------+ //---- drawing the indicator 1 as a line #property indicator_type1 DRAW_LINE //---- red color is used for the indicator line #property indicator_color1 Red //---- the indicator 1 line is a continuous curve #property indicator_style1 STYLE_SOLID //---- indicator 1 line width is equal to 1 #property indicator_width1 1 //---- displaying the indicator line label #property indicator_label1 "Negative Volume Index" //+----------------------------------------------+ //| Indicator input parameters | //+----------------------------------------------+ input ENUM_APPLIED_VOLUME VolumeType=VOLUME_TICK; // Volume input int Shift=0; // Horizontal shift of the indicator in bars //+----------------------------------------------+ //---- declaration of dynamic arrays that //---- will be used as indicator buffers double NVIBuffer[]; //+------------------------------------------------------------------+ //| Custom indicator initialization function | //+------------------------------------------------------------------+ void OnInit() { //---- set NVIBuffer[] dynamic array as an indicator buffer SetIndexBuffer(0,NVIBuffer,INDICATOR_DATA); //---- shifting the indicator 1 horizontally by Shift PlotIndexSetInteger(0,PLOT_SHIFT,Shift); //---- performing shift of the beginning of counting of drawing the indicator 1 by 1 PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,1); //---- setting the indicator values that won't be visible on a chart PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,0.0); //---- creating a name for displaying in a separate sub-window and in a tooltip IndicatorSetString(INDICATOR_SHORTNAME,"Negative Volume Index"); //---- determination of accuracy of displaying the indicator values IndicatorSetInteger(INDICATOR_DIGITS,_Digits); //---- } //+------------------------------------------------------------------+ //| Custom indicator iteration function | //+------------------------------------------------------------------+ int OnCalculate(const int rates_total, // number of bars in history at the current tick const int prev_calculated,// number of bars calculated at previous call const datetime &time[], const double &open[], const double& high[], // price array of maximums of price for the indicator calculation const double& low[], // price array of minimums of price for the indicator calculation const double &close[], const long &tick_volume[], const long &volume[], const int &spread[]) { //---- checking the number of bars to be enough for the calculation if(rates_total<2) return(0); //---- declarations of local variables int first,bar; long Vol0,Vol1; //---- calculation of the 'first' starting index for the bars recalculation loop if(prev_calculated>rates_total || prev_calculated<=0) // checking for the first start of the indicator calculation { first=1; // starting index for calculation of all bars NVIBuffer[0]=1.0; } else first=prev_calculated-1; // starting index for calculation of new bars //---- main indicator calculation loop for(bar=first; bar