Drawing rectancle around text object to change background color

[Daniel Lewis]

There's no way to set the background color of a text object (OBJ_LABEL or OBJ_TEXT) that I can find. A workaround would be to draw an OBJ_RECTANGLE with background property set true. This is all well and good when these objects are in a fixed location on the chart. I want to be able to specify screen loaction in the EA parameters to move the box/text objects - the problem is that text objects use pixel offsets for placement and rectangle object uses a time/price to determine screen location. Does anyone have an algorithm to convert time/price to pixels (or vice-versa)? Can it even be done using only MQL4 syntax? I don't see any built-in functions/properties to get it done.

Thanks!

[cameo]

If pixel is what you need, here's a workaround using font labels. It's from Clock indicator by P4L. 

PS: The letter 'g' in Webdings font is a rectangle.  

// inside start()   
CreateBackground("BgroundGG","ggggggggggggggggggggg",BgroundFontSize,Corner,DisplayNudgeX-5,DisplayNudgeY-4);

// function
int CreateBackground (string backName, string text, int Bfontsize, int LabelCorner, int xB, int yB)
{
           if(ObjectFind(backName) == -1){
         ObjectCreate(backName, OBJ_LABEL, 0, 0, 0, 0, 0);}
      ObjectSetText(backName, text, Bfontsize, "Webdings");      
      ObjectSet(backName, OBJPROP_CORNER, LabelCorner);
      ObjectSet(backName, OBJPROP_BACK, false);
      ObjectSet(backName, OBJPROP_XDISTANCE, xB);
      ObjectSet(backName, OBJPROP_YDISTANCE, yB );    
      ObjectSet(backName, OBJPROP_COLOR, BgroundColor);
}