OverLayChartLine

Author: Copyright� 2006 S.B.T.
OverLayChartLine

This script is designed to overlay the price movements of one currency pair (defined by the user) onto the current chart. Think of it as tracing the ups and downs of one currency pair on top of another, allowing for a visual comparison.

Here's a breakdown of what it does, step by step:

  1. Setup:

    • It starts by defining some basic information like the author and website.
    • It also defines parameters that the user can change, like the currency pair to overlay (e.g., USDJPY), colors for the lines representing the high, low, open, and close prices of the overlay pair. There's also a mirroring option and grid customization.

  2. Initialization:

    • The script sets up the names used to identify the overlay chart and the lines that will be drawn.
    • It prepares "storage spaces" (called buffers) to hold the calculated price data for the overlay. It links the buffers to the lines

  3. Deinitialization:

    • When the script is removed from the chart, this part cleans up by deleting the objects like the chart name and copyright, and the grid lines it drew to avoid cluttering the chart.

  4. Core Logic (Start Function):

    • Data Preparation: It finds the highest and lowest prices within the visible area of the current chart and for the currency pair being overlaid. This allows it to properly scale and position the overlay.
    • Mirroring Adjustment The mirroring option reverses the direction of the candlesticks on the chart
    • Scaling: It calculates the ratio between the price ranges of the current chart and the overlay currency pair. This is crucial for ensuring the overlay "fits" onto the existing chart proportionally.
    • Drawing the Overlay: For each visible bar (candlestick) on the current chart, it calculates the corresponding open, high, low, and close prices of the overlay currency pair, adjusting for the scaling ratio and mirroring. These calculated values are then stored in the buffers, which are linked to the corresponding lines that are displayed on the chart.
    • Drawing Grid and Labels: The script draws a grid on the chart to help visualize the price levels of the overlay currency pair. It also adds text labels showing the corresponding price values for these grid lines.

In essence, this script takes the price data of a user-specified currency pair, scales it to fit the current chart's price range, and then draws it as an overlay. It also adds gridlines to help with visual interpretation.

Price Data Components
Series array that contains the lowest prices of each barSeries array that contains the highest prices of each barSeries array that contains open prices of each barSeries array that contains close prices for each bar
Miscellaneous
Implements a curve of type %1
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OverLayChartLine 
//+------------------------------------------------------------------+
//|                                       OverLay Chart.mq4 Ver.1.10 |
//|                                      Copyright© 2006-2007 S.B.T. |
//|                                     http://sufx.core.t3-ism.net/ |
//+------------------- DO NOT REMOVE THIS HEADER --------------------+
//|  This script is free to use/distribute/modify and re-distribute. |
//|                                  (Limited to noncommercial use.) |
//+------------------------------------------------------------------+

//Indicator Properties
#property copyright "Copyright© 2006 S.B.T."
#property link      "http://sufx.core.t3-ism.net/"
#property indicator_chart_window
#property indicator_buffers 4


//Indicator Parameters
extern string SubSymbol = "USDJPY";
extern string hlc = "high line color";
extern color HighLineColor = CLR_NONE;
extern string llc = "low line color";
extern color LowLineColor = CLR_NONE;
extern string olc = "open line color";
extern color OpenLineColor = CLR_NONE;
extern string clc = "close line color";
extern color CloseLineColor = Orange;
extern color GridColor = Black;
extern bool Mirroring = false;

//Global Variables
string Prefix; //Indicator Prefix
int Grid = 10; //Grid Lines
int SnapPips = 10;  //Snap Pips For Grid Lines


//Indicator Buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];
double ExtMapBuffer3[];
double ExtMapBuffer4[];



//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init() {

   //Initialize Indexes
   Prefix = "OverLayChart" + SubSymbol;

   IndicatorShortName( "OverLay Chart( " + SubSymbol + " )" );

   SetIndexBuffer( 0, ExtMapBuffer1 );
   SetIndexBuffer( 1, ExtMapBuffer2 );
   SetIndexBuffer( 2, ExtMapBuffer3 );
   SetIndexBuffer( 3, ExtMapBuffer4 );

   SetIndexStyle( 0, DRAW_LINE, EMPTY, EMPTY, HighLineColor );
   SetIndexStyle( 1, DRAW_LINE, EMPTY, EMPTY, LowLineColor );
   SetIndexStyle ( 2, DRAW_LINE,EMPTY, EMPTY, OpenLineColor );
   SetIndexStyle( 3, DRAW_LINE, EMPTY, EMPTY, CloseLineColor );

   SetIndexEmptyValue( 0, 0.0 );
   SetIndexEmptyValue( 1, 0.0 );
   SetIndexEmptyValue( 2, 0.0 );
   SetIndexEmptyValue( 3, 0.0 );


   return( 0 );
}



//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit() {
   int _i;
   
   

   //Delete Objects
	ObjectDelete( Prefix + "Status" );
	ObjectDelete( Prefix + "Copyright" );

	for ( _i = 1; _i <= Grid ; _i ++ ) {
   	ObjectDelete( Prefix + "Grid" + _i );
   	ObjectDelete( Prefix + "Price" + _i );
   }


   return( 0 );
}



//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start() {
   int _BarsCount;
   double _CurRangeHigh, _CurRangeLow, _CurRangeCenter;
   double _SubRangeHigh, _SubRangeLow, _SubRangeCenter;
   double _SubPoint, _SubDigit;
   double _SubOpen, _SubHigh, _SubLow, _SubClose;
   double _PipsRatio;
   double _GridPips, _GridPrice;
   int _i;



   //Initialize Buffers
	RefreshRates();

   ArrayInitialize( ExtMapBuffer1, 0.0 );
   ArrayInitialize( ExtMapBuffer2, 0.0 );
   ArrayInitialize( ExtMapBuffer3, 0.0 );
   ArrayInitialize( ExtMapBuffer4, 0.0 );


   //Calculate Visible Bars
   _BarsCount = BarsPerWindow() + 1;
   int _FirstBar = FirstVisibleBar();
   int _LastBar = _FirstBar - _BarsCount + 1;
   if ( _LastBar < 0 ) {
      _LastBar = 0;
      _BarsCount = _FirstBar + 1;
   }


   //Calculate Chart Ratio
   _CurRangeHigh = High[Highest(NULL, 0, MODE_HIGH, _BarsCount, _LastBar)];
   _CurRangeLow = Low[Lowest(NULL, 0, MODE_LOW, _BarsCount, _LastBar)];
   _CurRangeCenter = ( _CurRangeHigh + _CurRangeLow ) / 2;

   if ( Mirroring ) {
      _SubRangeHigh = iLow( SubSymbol, 0, Lowest( SubSymbol, 0, MODE_LOW, _BarsCount, _LastBar ) );
      _SubRangeLow = iHigh( SubSymbol, 0, Highest( SubSymbol, 0, MODE_HIGH, _BarsCount, _LastBar ) );
   } else {
      _SubRangeHigh = iHigh( SubSymbol, 0, Highest( SubSymbol, 0, MODE_HIGH, _BarsCount, _LastBar ) );
      _SubRangeLow = iLow( SubSymbol, 0, Lowest( SubSymbol, 0, MODE_LOW, _BarsCount, _LastBar ) );
   }

   _SubRangeCenter = ( _SubRangeHigh + _SubRangeLow ) / 2;
   _SubPoint = MarketInfo( SubSymbol, MODE_POINT );
   _SubDigit = MarketInfo( SubSymbol, MODE_DIGITS );

   _PipsRatio = ( _CurRangeHigh - _CurRangeLow )  / ( _SubRangeHigh - _SubRangeLow );

   _GridPips = ( _SubRangeHigh - _SubRangeLow ) / Grid;
   _GridPips = MathRound( ( _SubRangeHigh - _SubRangeLow ) / Grid / ( _SubPoint * SnapPips ) ) * ( _SubPoint * SnapPips );


   //Draw Candlesticks
	for ( _i = _LastBar; _i < _LastBar + _BarsCount; _i ++ ) {
      _SubOpen = iOpen( SubSymbol, 0, _i ) - _SubRangeCenter;
      _SubHigh = iHigh( SubSymbol, 0, _i ) - _SubRangeCenter;
      _SubLow = iLow( SubSymbol, 0, _i ) - _SubRangeCenter;
      _SubClose = iClose( SubSymbol, 0, _i ) - _SubRangeCenter;

      if ( Mirroring ) {
         if ( _SubOpen < _SubClose )
          {
            ExtMapBuffer2[_i] = _CurRangeCenter + _SubHigh * _PipsRatio;
            ExtMapBuffer1[_i] = _CurRangeCenter + _SubLow * _PipsRatio;
         }
         ExtMapBuffer2[_i] = _CurRangeCenter + _SubLow * _PipsRatio;
         ExtMapBuffer1[_i] = _CurRangeCenter + _SubHigh * _PipsRatio;
         ExtMapBuffer4[_i] = _CurRangeCenter + _SubClose * _PipsRatio;
         ExtMapBuffer3[_i] = _CurRangeCenter + _SubOpen * _PipsRatio;
      } 
      else {
         
         if ( _SubOpen < _SubClose )
         {
            ExtMapBuffer1[_i] = _CurRangeCenter + _SubHigh * _PipsRatio;
            ExtMapBuffer2[_i] = _CurRangeCenter + _SubLow * _PipsRatio;
         }
          
         ExtMapBuffer1[_i] = _CurRangeCenter + _SubHigh * _PipsRatio;
         ExtMapBuffer2[_i] = _CurRangeCenter + _SubLow * _PipsRatio;
         ExtMapBuffer3[_i] = _CurRangeCenter + _SubClose * _PipsRatio;
         ExtMapBuffer4[_i] = _CurRangeCenter + _SubOpen * _PipsRatio;
      }
   }


   //Draw Objects
   ObjectCreate( Prefix + "Copyright", OBJ_LABEL, 0, 0, 0 );
	ObjectSet( Prefix + "Copyright", OBJPROP_COLOR, GridColor );
   ObjectSet( Prefix + "Copyright", OBJPROP_CORNER, 3 );
   ObjectSet( Prefix + "Copyright", OBJPROP_XDISTANCE, 4 );
   ObjectSet( Prefix + "Copyright", OBJPROP_YDISTANCE, 4 );
   ObjectSetText( Prefix + "Copyright", "OverLay Chart by S.B.T.", 8 );

   ObjectCreate( Prefix + "Status", OBJ_LABEL, 0, 0, 0 );
	ObjectSet( Prefix + "Status", OBJPROP_COLOR, GridColor );
   ObjectSet( Prefix + "Status", OBJPROP_CORNER, 0 );
   ObjectSet( Prefix + "Status", OBJPROP_XDISTANCE, 4 );
   ObjectSet( Prefix + "Status", OBJPROP_YDISTANCE, 16 );
   ObjectSetText( Prefix + "Status",
                  SubSymbol + " O = " + DoubleToStr( iOpen( SubSymbol, 0, _LastBar ), _SubDigit ) +
                  ", H = " + DoubleToStr( iHigh( SubSymbol, 0, _LastBar ), _SubDigit ) +
                  ", L = " + DoubleToStr( iLow( SubSymbol, 0, _LastBar ), _SubDigit ) +
                  ", C = " + DoubleToStr( iClose( SubSymbol, 0, _LastBar ), _SubDigit ),
                  8 );

	for ( _i = 1; _i <= Grid ; _i ++ ) {
      _GridPrice = MathRound( _SubRangeCenter / ( _SubPoint * SnapPips ) ) * ( _SubPoint * SnapPips );
      _GridPrice = ( ( _GridPrice + _GridPips / 2 ) + _GridPips * ( Grid / 2 - 1 ) ) - ( _GridPips * ( _i - 1 ) );

		ObjectCreate( Prefix + "Grid" + _i, OBJ_TREND, 0, 0, 0 );
      ObjectSet( Prefix + "Grid" + _i, OBJPROP_TIME1, Time[_FirstBar] );
      ObjectSet( Prefix + "Grid" + _i, OBJPROP_PRICE1, _CurRangeCenter + ( _GridPrice - _SubRangeCenter ) * _PipsRatio );
      ObjectSet( Prefix + "Grid" + _i, OBJPROP_TIME2, Time[_LastBar] );
      ObjectSet( Prefix + "Grid" + _i, OBJPROP_PRICE2, _CurRangeCenter + ( _GridPrice - _SubRangeCenter ) * _PipsRatio );
		ObjectSet( Prefix + "Grid" + _i, OBJPROP_COLOR, GridColor );
		ObjectSet( Prefix + "Grid" + _i, OBJPROP_STYLE, STYLE_DOT );
		ObjectSet( Prefix + "Grid" + _i, OBJPROP_WIDTH, 1 );
		ObjectSet( Prefix + "Grid" + _i, OBJPROP_RAY, true );

		ObjectCreate( Prefix + "Price" + _i, OBJ_TEXT, 0, 0, 0 );
      ObjectSet( Prefix + "Price" + _i, OBJPROP_TIME1, Time[_FirstBar - _BarsCount / 10] );
      ObjectSet( Prefix + "Price" + _i, OBJPROP_PRICE1, _CurRangeCenter + ( _GridPrice - _SubRangeCenter ) * _PipsRatio );
		ObjectSet( Prefix + "Price" + _i, OBJPROP_COLOR, GridColor );
      ObjectSetText( Prefix + "Price" + _i, DoubleToStr( _GridPrice, _SubDigit ), 8 );
   }


   return( 0 );
}
//+------------------------------------------------------------------+

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