【MQL4】損切りラインと現在値の距離を常に表示するインジケーターのアイデア｜『損切り未設定』も見える化する

//+------------------------------------------------------------------+
//|                                    StopLossDistance.mq4           |
//|                     Copyright 2026, FX-EA System Project Creator |
//|                        https://creator.fx-ea-system-project.com/ |
//+------------------------------------------------------------------+
#property copyright "Copyright 2026, FX-EA System Project Creator"
#property link      "https://creator.fx-ea-system-project.com/"
#property version   "1.00"
#property strict
#property indicator_chart_window
#property indicator_buffers 0

input int MagicFilter = 0;//0なら全ポジションを対象、特定EAだけ見たい場合はマジックナンバーを指定
input int WarningPips  = 10;//この距離以下になったら警告色にする

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
   return(INIT_SUCCEEDED);
  }

//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
   ClearDistanceLabels();
  }

//+------------------------------------------------------------------+
//| 前回作成したラベルをすべて削除する                                 |
//+------------------------------------------------------------------+
void ClearDistanceLabels()
  {
   for(int i=ObjectsTotal(0,0,OBJ_LABEL)-1; i>=0; i--)
     {
      string objName = ObjectName(0,i,0,OBJ_LABEL);
      if(StringFind(objName,"SLDistance_")==0)
         ObjectDelete(0,objName);
     }
  }

//+------------------------------------------------------------------+
//| 1件分のラベルを作成・更新する                                     |
//+------------------------------------------------------------------+
void DrawDistanceLabel(int rowIndex,string text,color textColor)
  {
   string name = "SLDistance_"+IntegerToString(rowIndex);
   ObjectCreate(0,name,OBJ_LABEL,0,0,0);
   ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
   ObjectSetInteger(0,name,OBJPROP_XDISTANCE,10);
   ObjectSetInteger(0,name,OBJPROP_YDISTANCE,20+rowIndex*16);
   ObjectSetText(name,text,10,"Arial",textColor);
  }

//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                 const int prev_calculated,
                 const datetime &time[],
                 const double &open[],
                 const double &high[],
                 const double &low[],
                 const double &close[],
                 const long &tick_volume[],
                 const long &volume[],
                 const int &spread[])
  {
   ClearDistanceLabels();
   int rowIndex = 0;

   for(int i=OrdersTotal()-1; i>=0; i--)
     {
      if(!OrderSelect(i,SELECT_BY_POS,MODE_TRADES)) continue;
      if(OrderSymbol()!=Symbol()) continue;
      if(OrderType()!=OP_BUY && OrderType()!=OP_SELL) continue;
      if(MagicFilter!=0 && OrderMagicNumber()!=MagicFilter) continue;

      double sl = OrderStopLoss();

      if(sl==0)
        {
         DrawDistanceLabel(rowIndex, StringFormat("#%d 損切り未設定です", OrderTicket()), clrRed);
         rowIndex++;
         continue;
        }

      double currentPrice = (OrderType()==OP_BUY) ? Bid : Ask;
      double distancePoints = MathAbs(currentPrice - sl) / Point;
      double distancePips = distancePoints / 10.0;//5桁ブローカー前提。4桁の場合はこの割り算を外す

      color c = (distancePips <= WarningPips) ? clrOrange : clrLime;
      DrawDistanceLabel(rowIndex, StringFormat("#%d 損切りまで%.1fpips", OrderTicket(), distancePips), c);
      rowIndex++;
     }

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