MQL5删除或减少趋势线的点大小

Question

我试图在图表上绘制趋势线对象。但我对趋势线上出现的点感到不安。这是代码：

bool TrendCreate(const long            chart_ID=0,        // chart's ID 
                 const string          name="TrendLine",  // line name 
                 const int             sub_window=0,      // subwindow index 
                 datetime              time1=0,           // first point time 
                 double                price1=0,          // first point price 
                 datetime              time2=0,           // second point time 
                 double                price2=0,          // second point price 
                 const color           clr=clrRed,        // line color 
                 const ENUM_LINE_STYLE style=STYLE_SOLID, // line style 
                 const int             width=1,           // line width 
                 const bool            back=false,        // in the background 
                 const bool            selection=true,    // highlight to move 
                 const bool            ray_left=false,    // line's continuation to the left 
                 const bool            ray_right=false,   // line's continuation to the right 
                 const bool            hidden=true,       // hidden in the object list 
                 const long            z_order=0)         // priority for mouse click 
  { 
//--- set anchor points' coordinates if they are not set 
   ChangeTrendEmptyPoints(time1,price1,time2,price2); 
//--- reset the error value 
   ResetLastError(); 
//--- create a trend line by the given coordinates 
   if(!ObjectCreate(chart_ID,name,OBJ_TREND,sub_window,time1,price1,time2,price2)) 
     { 
      Print(__FUNCTION__, 
            ": failed to create a trend line! Error code = ",GetLastError()); 
      return(false); 
     } 
//--- set line color 
   ObjectSetInteger(chart_ID,name,OBJPROP_COLOR,clr); 
//--- set line display style 

   ObjectSetInteger(chart_ID,name,OBJPROP_STYLE,style); 

//Set text on the graph

   ObjectSetString(chart_ID,name,OBJPROP_TEXT,DoubleToString(price1 - price2));

//--- set line width 
   ObjectSetInteger(chart_ID,name,OBJPROP_WIDTH,width); 
//--- display in the foreground (false) or background (true) 
   ObjectSetInteger(chart_ID,name,OBJPROP_BACK,back); 
//--- enable (true) or disable (false) the mode of moving the line by mouse 
//--- when creating a graphical object using ObjectCreate function, the object cannot be 
//--- highlighted and moved by default. Inside this method, selection parameter 
//--- is true by default making it possible to highlight and move the object 
   ObjectSetInteger(chart_ID,name,OBJPROP_SELECTABLE,selection); 
   ObjectSetInteger(chart_ID,name,OBJPROP_SELECTED,selection); 
//--- enable (true) or disable (false) the mode of continuation of the line's display to the left 
   ObjectSetInteger(chart_ID,name,OBJPROP_RAY_LEFT,ray_left); 
//--- enable (true) or disable (false) the mode of continuation of the line's display to the right 
   ObjectSetInteger(chart_ID,name,OBJPROP_RAY_RIGHT,ray_right); 
//--- hide (true) or display (false) graphical object name in the object list 
   ObjectSetInteger(chart_ID,name,OBJPROP_HIDDEN,hidden); 
//--- set the priority for receiving the event of a mouse click in the chart 
   ObjectSetInteger(chart_ID,name,OBJPROP_ZORDER,z_order); 
//--- successful execution 
   return(true); 
  } 
//+------------------------------------------------------------------+ 
//| Move trend line anchor point                                     | 
//+------------------------------------------------------------------+ 
bool TrendPointChange(const long   chart_ID=0,       // chart's ID 
                      const string name="TrendLine", // line name 
                      const int    point_index=0,    // anchor point index 
                      datetime     time=0,           // anchor point time coordinate 
                      double       price=0)          // anchor point price coordinate 
  { 
//--- if point position is not set, move it to the current bar having Bid price 
   if(!time) 
      time=TimeCurrent(); 
   if(!price) 
      price=SymbolInfoDouble(Symbol(),SYMBOL_BID); 
//--- reset the error value 
   ResetLastError(); 
//--- move trend line's anchor point 
   if(!ObjectMove(chart_ID,name,point_index,time,price)) 
     { 
      Print(__FUNCTION__, 
            ": failed to move the anchor point! Error code = ",GetLastError()); 
      return(false); 
     } 
//--- successful execution 
   return(true); 
  } 
//+------------------------------------------------------------------+ 
//| The function deletes the trend line from the chart.              | 
//+------------------------------------------------------------------+ 

//+------------------------------------------------------------------+ 
//| Check the values of trend line's anchor points and set default   | 
//| values for empty ones                                            | 
//+------------------------------------------------------------------+ 
void ChangeTrendEmptyPoints(datetime &time1,double &price1, 
                            datetime &time2,double &price2) 
  { 
//--- if the first point's time is not set, it will be on the current bar 
   if(!time1) 
      time1=TimeCurrent(); 
//--- if the first point's price is not set, it will have Bid value 
   if(!price1) 
      price1=SymbolInfoDouble(Symbol(),SYMBOL_BID); 
//--- if the second point's time is not set, it is located 9 bars left from the second one 
   if(!time2) 
     { 
      //--- array for receiving the open time of the last 10 bars 
      datetime temp[10]; 
      CopyTime(Symbol(),Period(),time1,10,temp); 
      //--- set the second point 9 bars left from the first one 
      time2=temp[0]; 
     } 
//--- if the second point's price is not set, it is equal to the first point's one 
   if(!price2) 
      price2=price1; 
  }

这是图像：

现在我所期待的是，线上的点应该很小，或者如果不可用仍然可以。

但我不知道如何做到这一点。请建议我。

Answer 1

删除很简单，根本无法调整大小：

嗯，这些GUI属性只有 { On | Off } ，很难（截至2018年 - Q1）将更改注入MetaTrader Terminal内部处理其原生GUI元素。很遗憾，但事实就是这样（对于GUI字体来说是相同的，对于GUI-Comment-zone字体大小和许多其他字体也是如此）。

然而，还有一条路要走：

可以在创建线路时关闭这些控制点（只需在 selection 属性设置关闭的情况下修改呼叫（因为默认呼叫签名具有：
selection=true, // highlight to move

并让用户选择在任何后期阶段双击GUI对象，一旦GUI对象确实被移动。

通过这种方式，报告的GUI组合的干扰将被消除，同时保护用户方便使用GUI。