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Learning the MT4 Language

  • #1
  • First Post: Jul 19, 2023 12:27pm Jul 19, 2023 12:27pm
Learning the MT4 Language.... or trying.

I am trying to draw a rectangle that is LightSkyBlue with a label that says Supply.
I have a part of it, but hit a wall. Any ideas or help?

Inserted Code
void OnStart()
  {
   double x1 = Time[0] - PeriodSeconds() * 0.5;
   double x2 = Time[0] + PeriodSeconds() * 20.5;
   double y1 = High[0];
   double y2 = Low[0];
// Draw the rectangle
   ObjectCreate("Supply", OBJ_RECTANGLE, 0, x1, y1, x2, y2);
   ObjectSet("Supply", OBJPROP_COLOR, LightSkyBlue);
   ObjectSet("Supply", OBJPROP_WIDTH, 1);
  }

Also, how do you attach files. They all seem to be web links only. Do you upload your scripts somewhere?
  • #2
  • Last Post: Edited 9:51pm Jul 26, 2023 8:51pm | Edited 9:51pm
Assuming you do want something like this:

Attached Image (click to enlarge)
Click to Enlarge Name: 2023-07-27_01-41.png Size: 2 KB


Then I guess I have an example. I achieve this by using 2 functions: one creates rectangle, and another creates label. Then I invoke these functions in OnInit() event of my EA. I must excuse myself for testing on MT5, but this code may be working in MT4 (I made some cross-platform EA, so not all the code differs).

Anyway, let us give it a try.

OnInit():
Inserted Code
    RectLabelCreate(0, "TestRectLabel", 0, 20, 20, 100, 20, clrLightSkyBlue, BORDER_FLAT, CORNER_LEFT_UPPER, clrLightSkyBlue);
    out_Label("TestTextLabel", "Supply", "Verdana", 50, 30, 14, clrBlack);

Add these functions near the OnInit() - at the same level:
Inserted Code
bool RectLabelCreate( const long             chart_ID    = 0,                 //chart ID
                      const string           name        = "RectLabel",       // label name
                      const int              sub_window  = 0,                 // subwindow number
                      const int              x           = 0,                 // X coordinate
                      const int              y           = 0,                 // Y coordinate
                      const int              width       = 50,                // width
                      const int              height      = 18,                // height
                      const color            back_clr    = C'236,233,216',    // backgrounf color
                      const ENUM_BORDER_TYPE border      = BORDER_FLAT,       // border type
                      const ENUM_BASE_CORNER _corner     = CORNER_LEFT_UPPER, // chart corner to anchor
                      const color            clr         = clrRed,            // flat border color
                      const ENUM_LINE_STYLE  style       = STYLE_SOLID,       // style border color
                      const int              line_width  = 1)                 // width border color
{  
  
    if (!ObjectCreate(chart_ID,name,OBJ_RECTANGLE_LABEL,sub_window,0,0)) {
        Print(__FUNCTION__,": can't create rectangle label! " + IntegerToString(GetLastError()));
        return false;
    }
  
   ObjectSetInteger(chart_ID,name, OBJPROP_XDISTANCE, x);
   ObjectSetInteger(chart_ID,name, OBJPROP_YDISTANCE, y);
   ObjectSetInteger(chart_ID,name, OBJPROP_XSIZE, width);
   ObjectSetInteger(chart_ID,name, OBJPROP_YSIZE, height);
   ObjectSetInteger(chart_ID,name, OBJPROP_BGCOLOR, back_clr);
   ObjectSetInteger(chart_ID,name, OBJPROP_BORDER_TYPE, border);
   ObjectSetInteger(chart_ID,name, OBJPROP_CORNER, _corner);
   ObjectSetInteger(chart_ID,name, OBJPROP_COLOR, clr);
   ObjectSetInteger(chart_ID,name, OBJPROP_STYLE, style);
   ObjectSetInteger(chart_ID,name, OBJPROP_WIDTH, line_width);
  
   return true;
}
 
//+------------------------------------------------------------------+
 
void out_Label( string name,
                string text,
                string font,
                int X,
                int Y,
                int font_size,
                color col)
{
    if(ObjectFind(0, name) < 0) {
        ObjectCreate(0,name,OBJ_LABEL,0,0,0);
        ObjectSetInteger(0,name,OBJPROP_CORNER,0);
        ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
        ObjectSetInteger(0,name,OBJPROP_ANCHOR,ANCHOR_LEFT);
        ObjectSetInteger(0,name,OBJPROP_XDISTANCE,X);
        ObjectSetInteger(0,name,OBJPROP_YDISTANCE,Y);
      
        ObjectSetString(0, name, OBJPROP_TEXT, text);
        ObjectSetInteger(0, name, OBJPROP_COLOR, col);
        ObjectSetString(0, name, OBJPROP_FONT, font);  
    }  
}

Last but not least. Delete the graphical objects when EA is deattached:

Inserted Code
void OnDeinit(const int reason) {
    ObjectsDeleteAll(0, "Test");
}

I believe this is not a best solution, to say at least, but it's working lol.
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