Drawing a rectangle

[baruchs]

Hi,
Is it possible to draw a rectangle on a chart?
Les say I want to draw a resistence zone of 1.5 points.
On the esm8 - from 1440 to 1441.5

Regards,
Baruch

[Doji3333]

yes, it's actually quite easy. You have to draw all four lines to make the rectangle.

Mark each x/y point with bar/price data, then draw the lines.

A simple trick I use for this is to build a bar counter (counts every bar on the chart, then STORE/MARK (in an array or variables), the bars that identify your support/resistance. This way, you can create a simple array of the support/resistance levels your system finds.

From this array, you can draw from any point in the array to another or just back n bars. Here is some code for you to start with.

var vMA = null;
var vMACrossArray = new Array();

var nLastRawTime = null;
var NewBar = false;
var BarCounter = 0;


function preMain() {
    setPriceStudy(true);
    setStudyTitle("MA SR Example");
    setCursorLabelName("MA", 0);
    setDefaultBarFgColor(Color.blue, 0);
    setDefaultBarThickness(1,0);
        
    var fp1 = new FunctionParameter("Length", FunctionParameter.NUMBER);
    fp1.setLowerLimit(1);        
    fp1.setDefault(20); //Edit this value to set a new default
    
    var fp2 = new FunctionParameter("Offset", FunctionParameter.NUMBER);
    fp2.setDefault(0); //Edit this value to set a new default
    
    var fp3 = new FunctionParameter("Source", FunctionParameter.STRING);
    fp3.setName("Source");
    fp3.addOption("Close");
    fp3.addOption("High");
    fp3.addOption("Low");
    fp3.addOption("Open");
    fp3.addOption("HL/2");
    fp3.addOption("HLC/3");
    fp3.addOption("OHLC/4");
    fp3.setDefault("Close"); //Edit this value to set a new default    
    
    var fp4 = new FunctionParameter("Type", FunctionParameter.STRING);
    fp4.setName("Type");
    fp4.addOption("MAStudy.SIMPLE");
    fp4.addOption("MAStudy.EXPONENTIAL");
    fp4.addOption("MAStudy.WEIGHTED");
    fp4.addOption("MAStudy.VOLUMEWEIGHTED");
    fp4.setDefault("MAStudy.SIMPLE"); //Edit this value    to set a new default

    var fp5 = new FunctionParameter("SupportRange", FunctionParameter.NUMBER);
    fp5.setLowerLimit(0);        
    fp5.setDefault(1.50); //Edit this value to set a new default
    
    var fp6 = new FunctionParameter("ResistanceRange", FunctionParameter.NUMBER);
    fp6.setLowerLimit(0);        
    fp6.setDefault(1.50); //Edit this value to set a new default
}

function main(Length,Offset,Source,Type,SupportRange,ResistanceRange) {
   
    if (vMA == null) vMA = new MAStudy(Length, Offset, Source, eval(Type));
 
/*****************************************
Insert your code following this text block
Use vMA.getValue(MAStudy.MA) for your code
******************************************/


   if ((getValue("rawtime", 0) != nLastRawTime) ) {
     nLastRawTime = getValue("rawtime", 0);
     NewBar = true;
     BarCounter += 1;
     
   }



//  vMA Cross
   if ((close(-1) > vMA.getValue(MAStudy.MA,-1)) && (close(-2) < vMA.getValue(MAStudy.MA,-2) ) ) {
      var TempObj = new Object;
        TempObj.Price = vMA.getValue(MAStudy.MA,-1);
        TempObj.Bar = BarCounter-1;
        TempObj.Dir = 1;
     vMACrossArray.push(TempObj);
     fFindnDrawBoxonLastTrigger(SupportRange,ResistanceRange);
   }
   if ((close(-1) < vMA.getValue(MAStudy.MA,-1)) && (close(-2) > vMA.getValue(MAStudy.MA,-2) ) ) {
      var TempObj = new Object;
        TempObj.Price = vMA.getValue(MAStudy.MA,-1);
        TempObj.Bar = BarCounter-1;
        TempObj.Dir = -1;
     vMACrossArray.push(TempObj);
     fFindnDrawBoxonLastTrigger(SupportRange,ResistanceRange);
   }


    
    return vMA.getValue(MAStudy.MA);
}

function fFindnDrawBoxonLastTrigger(vSupportRange,vResistanceRange) {
   if (vMACrossArray.length >= 2) {  //  We have to have at least 2 items in the array before we start looking to draw boxes
     if (vMACrossArray[(vMACrossArray.length-1)].Dir > 0) {
       //  Last MA Cross is Bullish
       // - horizontal lines
         drawLineRelative( (vMACrossArray[(vMACrossArray.length-2)].Bar - vMACrossArray[(vMACrossArray.length-1)].Bar) ,vMACrossArray[(vMACrossArray.length-1)].Price,-1,vMACrossArray[(vMACrossArray.length-1)].Price, PS_SOLID, 2, Color.green, "H1"+BarCounter);
         drawLineRelative( (vMACrossArray[(vMACrossArray.length-2)].Bar - vMACrossArray[(vMACrossArray.length-1)].Bar) ,(vMACrossArray[(vMACrossArray.length-1)].Price-vSupportRange),-1,(vMACrossArray[(vMACrossArray.length-1)].Price-vSupportRange), PS_SOLID, 2, Color.green, "H2"+BarCounter);
       // - Vert lines
         drawLineRelative( (vMACrossArray[(vMACrossArray.length-2)].Bar - vMACrossArray[(vMACrossArray.length-1)].Bar) ,(vMACrossArray[(vMACrossArray.length-1)].Price),(vMACrossArray[(vMACrossArray.length-2)].Bar - vMACrossArray[(vMACrossArray.length-1)].Bar),(vMACrossArray[(vMACrossArray.length-1)].Price-vSupportRange), PS_SOLID, 2, Color.green, "V1"+BarCounter);
         drawLineRelative( -1 ,(vMACrossArray[(vMACrossArray.length-1)].Price),-1,(vMACrossArray[(vMACrossArray.length-1)].Price-vSupportRange), PS_SOLID, 2, Color.green, "V2"+BarCounter);
     
     }
     if (vMACrossArray[(vMACrossArray.length-1)].Dir < 0) {
       //  Last MA Cross is Bullish
     
       //  Last MA Cross is Bullish
       // - horizontal lines
         drawLineRelative( (vMACrossArray[(vMACrossArray.length-2)].Bar - vMACrossArray[(vMACrossArray.length-1)].Bar) ,vMACrossArray[(vMACrossArray.length-1)].Price,-1,vMACrossArray[(vMACrossArray.length-1)].Price, PS_SOLID, 2, Color.red, "H1"+BarCounter);
         drawLineRelative( (vMACrossArray[(vMACrossArray.length-2)].Bar - vMACrossArray[(vMACrossArray.length-1)].Bar) ,(vMACrossArray[(vMACrossArray.length-1)].Price+vResistanceRange),-1,(vMACrossArray[(vMACrossArray.length-1)].Price+vResistanceRange), PS_SOLID, 2, Color.red, "H2"+BarCounter);
       // - Vert lines
         drawLineRelative( (vMACrossArray[(vMACrossArray.length-2)].Bar - vMACrossArray[(vMACrossArray.length-1)].Bar) ,(vMACrossArray[(vMACrossArray.length-1)].Price),(vMACrossArray[(vMACrossArray.length-2)].Bar - vMACrossArray[(vMACrossArray.length-1)].Bar),(vMACrossArray[(vMACrossArray.length-1)].Price+vResistanceRange), PS_SOLID, 2, Color.red, "V1"+BarCounter);
         drawLineRelative( -1 ,(vMACrossArray[(vMACrossArray.length-1)].Price),-1,(vMACrossArray[(vMACrossArray.length-1)].Price+vResistanceRange), PS_SOLID, 2, Color.red, "V2"+BarCounter);
     }
   
   }

} 

[Doji3333]

Oops. Forgot one thing. In order for this code to operate properly in REALTIME, you have to move the conditions that catch the MACross into the NEWBAR "if" statement. It should only test for this condition ONCE for every new bar.

Other than that, this is a good example of how to draw boxes.

[baruchs]

RE:rectangle

Hi,
Thanks for the example.
I actualy wanted to draw a rectangle by coloring the area, not drawing lines.
Is this posible?
Second question: Why do I get an error on line 46 of attached efs and how to correct it?

Regards,
Baruch