MQL4参考物件函数 TextOut

TextOut

The function displays a text in a custom array (buffer) and returns the result of that operation. The array is designed to create the graphical resource.

bool  TextOut(
   const string        text,          // displayed text
   int                 x,             // X coordinate
   int                 y,             // Y coordinate
   uint                anchor,        // anchor type
   uint                &data[],       // output buffer
   uint                width,         // buffer width in pixels
   uint                height,        // buffer height in pixels
   uint                color,         // text color
   ENUM_COLOR_FORMAT   color_format   // color format for output
   );

Parameters

text

[in] Displayed text that will be written to the buffer. Only one-lined text is displayed.

[in] X coordinate of the anchor point of the displayed text.

[in] Y coordinate of the anchor point of the displayed text.

anchor

[in] The value out of the 9 pre-defined methods of the displayed text's anchor point location. The value is set by a combination of two flags –C flags of horizontal and vertical text align. Flag names are listed in the Note below.

data[]

[in] Buffer, in which text is displayed. The buffer is used to create the graphical resource.

width

[in] Buffer width in pixels.

height

[in] Buffer height in pixels.

color

[in] Text color.

color_format

[in] Color format is set by ENUM_COLOR_FORMAT enumeration value.

Returned value

Returns true if successful, otherwise false.

Note

Anchor point specified by anchor is a combination of two flags of horizontal and vertical text align. Horizontal text align flags:

TA_LEFT –C anchor point on the left side of the bounding box
TA_CENTER –C horizontal anchor point is located at the center of the bounding box
TA_RIGHT –C anchor point on the right side of the bounding box

Vertical text align flags:

TA_TOP –C anchor point at the upper side of the bounding box
TA_VCENTER –C vertical anchor point is located at the center of the bounding box
TA_BOTTOM –C anchor point at the lower side of the bounding box

Possible combinations of flags and specified anchor points are shown in the image.

9 possible ways to bind a text string

Example:

#property strict
//--- width and height of the canvas (used for drawing)
#define IMG_WIDTH  200
#define IMG_HEIGHT 200
//--- display the parameter window before launching the script
#property script_show_inputs
//--- enable to set color format
input ENUM_COLOR_FORMAT clr_format=COLOR_FORMAT_XRGB_NOALPHA;
//--- drawing array (buffer)
uint ExtImg[IMG_WIDTH*IMG_HEIGHT];
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
  {
//--- create OBJ_BITMAP_LABEL object for drawing
   ObjectCreate(0,"CLOCK",OBJ_BITMAP_LABEL,0,0,0);
//--- specify the name of the graphical resource for writing in CLOCK object
   ObjectSetString(0,"CLOCK",OBJPROP_BMPFILE,"::IMG");

//--- auxiliary variables
   double a;            // arrow corner
   uint   nm=2700;      // minute corner
   uint   nh=2700*12;   // hour counter
   uint   w,h;          // variables for receiving text string sizes
   int    x,y;          // variables for calculation of the current coordinates of text string anchor points

//--- rotate clock hands in an infinite loop, till the script is stopped
   while(!IsStopped())
     {
      //--- clear the clock drawing buffer array
      ArrayFill(ExtImg,0,IMG_WIDTH*IMG_HEIGHT,0);
      //--- set the font for drawing digits for the clock-face
      TextSetFont("Arial",-200,FW_EXTRABOLD,0);
      //--- draw the clock-face
      for(int i=1;i<=12;i++)
        {
         //--- receive the size of the current hour on the clock-face
         TextGetSize(string(i),w,h);
         //--- calculate the coordinates of the current hour on the clock-face
         a=-((i*300)%3600*M_PI)/1800.0;
         x=IMG_WIDTH/2-int(sin(a)*80+0.5+w/2);
         y=IMG_HEIGHT/2-int(cos(a)*80+0.5+h/2);
         //--- output the hour on the clock-face to ExtImg[] buffer
         TextOut(string(i),x,y,TA_LEFT|TA_TOP,ExtImg,IMG_WIDTH,IMG_HEIGHT,0xFFFFFFFF,clr_format);
        }
      //--- now, specify the font for drawing the minute hand
      TextSetFont("Arial",-200,FW_EXTRABOLD,-int(nm%3600));
      //--- receive the size of the minute hand
      TextGetSize("----->",w,h);
      //--- calculate the coordinates of the minute hand on the clock-face
      a=-(nm%3600*M_PI)/1800.0;
      x=IMG_WIDTH/2-int(sin(a)*h/2+0.5);
      y=IMG_HEIGHT/2-int(cos(a)*h/2+0.5);
      //--- output of the minute hand to the clock-face in ExtImg[]buffer
      TextOut("----->",x,y,TA_LEFT|TA_TOP,ExtImg,IMG_WIDTH,IMG_HEIGHT,0xFFFFFFFF,clr_format);

      //--- now, set the font for drawing the minute hand
      TextSetFont("Arial",-200,FW_EXTRABOLD,-int(nh/12%3600));
      TextGetSize("==>",w,h);
      //--- calculate the coordinates of the hour hand on the clock-face
      a=-(nh/12%3600*M_PI)/1800.0;
      x=IMG_WIDTH/2-int(sin(a)*h/2+0.5);
      y=IMG_HEIGHT/2-int(cos(a)*h/2+0.5);
      //--- output of the hour hand on the clock-face to ExtImg[] buffer
      TextOut("==>",x,y,TA_LEFT|TA_TOP,ExtImg,IMG_WIDTH,IMG_HEIGHT,0xFFFFFFFF,clr_format);

      //--- update the graphical resource
      ResourceCreate("::IMG",ExtImg,IMG_WIDTH,IMG_HEIGHT,0,0,IMG_WIDTH,clr_format);
      //--- forced chart update
      ChartRedraw();

      //--- increase hour and minute counters
      nm+=60;
      nh+=60;
      //--- keeping a short pause between the frames
      Sleep(10);
     }
//--- delete CLOCK object when completing the script's operation
   ObjectDelete(0,"CLOCK");
//---
  }