Why was this done

When testing EAs using iWPR (Williams' Percent Range, %R) standard indicator, the picture is always far from promising: the indicator color cannot be changed (#1) and, most importantly, the level values are always the same (#2)!

At the same time, the EA based on iWPR can use the levels "-25" and "-75", but only the levels that are strictly fixed in the indicator itself ("-20" and "-80") will be shown during visual testing. This display seemed inconvenient to me, therefore some settings were made to the input parameters.

Now, after being called from the EA, the indicator levels exactly match the trading system. Example of calling WPR Custom implemented in the Vlado EA, MQL5 code

//--- create handle of the indicator iWPR     handle_iCustom=iCustom(m_symbol.Name(),Period(),"WPR Custom",Inp_WPR_Period,                            Inp_WPR_Color,Inp_WPR_Width,Inp_WPR_Level1,Inp_WPR_Level2);  //--- if the handle is not created      if(handle_iCustom==INVALID_HANDLE)       {        //--- tell about the failure and output the error code         PrintFormat("Failed to create handle of the iWPR indicator for the symbol %s/%s, error code %d",                    m_symbol.Name(),                    EnumToString(Period()),                    GetLastError());        //--- the indicator is stopped early         return(INIT_FAILED);       }  

and the result of a display in the strategy tester: