Articles

1. Motivation

Starting from build 196, MetaTrader 4 Client Terminal offers testing visualization function. It allows controlling the Expert Advisors' testing on a brand new level. Now, the trading programmer can watch every action of his or her Expert Advisor checking its operation on history!

You can read about how to use the visualizer in Testing of Expert Advisors in the MetaTrader 4 Client Terminal: An Outward Glance. In my previous article named Testing Visualization: Functionality Enhancement, it was described how to realize the "Trade" tab for testing. We will add the "Account History" tab to it here.

2. The Task and How to Realize It

First of all, we will have to reconcile ourselves to that we cannot create a shadow copy of the "Account History". To create it, we would have to write a complicate program using dlls. But we do not need this at all since the "Test Results" tab of the Tester contains almost the full information about operations made.

Our task is to display actual information. This can be very convenient when analyzing the Expert Advisor's work. There will be no need to switch between tabs all the time.

Since there is not very much space in the display and realization of scrolling is not a very simple task, we will only display the most recent events.

What is left, is to remind that, to create a subwindow where the history will be displayed, it is necessary to create an indicator and, having attached it to the chart, create the template named tester.tpl or in the template <expert_name>.tpl (you can download the indicator directly from this article).

Now we can start to prepare the Expert Advisor.

This is not very difficult either:
- save the VisualTestingTools.mq4 file in the directory named ...\MetaTrader 4\experts\include\;
- add the #include <VisualTestingTools.mq4> line to the Expert - now the file content is included into the Expert's code; and
- insert in the Expert's init() and start() functions the calls for functions responsible for trade history updating .

...
double _Commission = 0.0; string _Comment = ""; datetime _Expiration = -1;
 
#include <VisualTestingTools.mq4>
 
int init()
  {
    if(FastEMAPeriod >= SlowEMAPeriod) 
        return(-1);
    vTerminalInit();
    vHistoryInit();
    return(0);
  }
 
int start()
  {
    if(FastEMAPeriod >= SlowEMAPeriod)
        return(-1);
    vTerminalRefresh();
    vHistoryRefresh();
 
    int _GetLastError = 0;
...

   
You can download the ready Expert Advisor here.

3. Testing

Now, let us try to test the new Expert. For this, open the Strategy Tester window, select the CrossMACD_DeLuxe_VisualHistory in the Expert's menu and press its properties button.

The Expert has got some new external variables - they are declared in an included file named VisualTestingTools.mq4. Some of them are intended for controlling the "Terminal" tab, the other ones - for the "Account History" tab, but most of them are common:
- TerminalRows - the maximum amount of the "Terminal" tab lines to be displayed. If you make TerminalRows = 0, the terminal will not be updated;
- HistoryRows - the maximum amount of the "Account History" lines to be displayed. If you make HistoryRows = 0, the account history will not be updated;
- BigText - set true if you want to make the fonts larger;
- SignalPoints - the distance, in points, starting from which the Stop Loss, Stop Profit and Open Price fields of pending orders will be highlighted. For example, if SignalPoints = 10, the Stop Loss field will change its color when the price is at a 10-point distance from the Stop Loss of the position;
- ShowCancelled - set true if you want to see the cancelled orders in your trade history;
- ShowExpired - set true if you want to see expired pending orders in your trade history;
- MainColor - color of headlines of the Terminal and Account History, as well as the Terminal's trade account information bar (Balance, Equity, ...).
- BuyColor - color of information about Buy positions;
- BuyOPColor - color of the Open Price field of the Terminal tab; this color will replace the main color when the current price approaches to the open level of orders Buy Stop and Buy Limit;
- BuySLColor - for the Terminal tab: color, which will replace the main color when the price approaches the Stop Loss levels of Buy positions; for the Account History tab: color, which will replace the main color if the Buy position has been closed by StopLoss;
- BuyTPColor - the same as BuySLColor applied to the Take Profit of positions;
- SellOPColor, SellSLColor and SellTPColor - the same for Sell positions.

Set the desired values of variables and press OK. Check whether Visualization is enabled and start testing:

Testing Visualization: 'Terminal' and 'Account History' windows have been loaded



The EA has opened a position, and this is visualized in the 'Terminal' window



As soon as the position has been closed, it moved to the 'Account History' and was replaced with another one.
Note that the StopLoss field is highlighted in red - the position was closed by Stop Loss.



the second position has been closed by Take Profit.
Note that the latest positions are shown on top in the Account History.
Thus, we will always see the most recent events.

This is how our virtual Terminal looks after several minutes.

4. Possible Problems

The problem described in my article Testing Visualization: Functionality Enhancement applies to the vHistory indicator, as well: If the indicator is not in the second subwindow in the template used by the Tester, the proper operation of functions responsible for Account History updating should be provided by the explicitly specified subwindow number:

    vHistory_win = WindowFind( "vHistory" );
    if ( IsTesting() ) { vHistory_win = 2; }

 

5. Conclusion

Screenshots that illustrate how the Account History tab looks in various situations are given below.